Expanded onto a polyolefin composition (options), the composition a stabilizing reagent for foam, the product of foamed polyolefin and method of preparation of penopoliuretana

 

(57) Abstract:

The invention relates to a polyolefin composition capable of foaming, i.e. suitable for the production of increasing its size products of various types, and contains a combined stabilizing reagent that is designed to prevent shrinkage and expansion after cooling. Composition a stabilizing reagent contains at least one connection, which represents a partial ester with a polyhydric alcohol, at least one compound selected from the group consisting of higher alkyl amines, fatty acid amides and/or complete esters of higher fatty acids. Introduction to polyolefin composition combination of at least two compounds as stabilizing agent in an amount of 0.1 - 15% relative to the weight of polymer resin, minimizes shrinkage and expansion in the foamed material after cooling. 5 C. and 24 C.p. f-crystals, 1 table.

The present invention relates to novel polyolefin compositions capable of foaming, i.e. suitable for the production of increasing the sizes of the products of different type and containing a stabilizing composition designed to prevent shrinkage and R and products of increasing the sizes of foam, containing such a stabilizing composition.

Well known methods for making foam with thermal plasticization solid polyolefin resin and mixing such plasticized by heating the resin with a volatile blowing reagent at elevated temperature and pressure for forming a fluid gel and then extruding the gel into a zone of lower pressure and temperature to activate the blowing agent, the expansion of the gel and its cooling in order to obtain the desired solid parooliteenuse product.

A common problem is the shrinkage or expansion of such foamed products in their fresh or partially utverzhdenii form (e.g., before curing, contributing significantly more to the full release and/or degassing of gas-forming reagent from the porous structure of the foam). During period curing or curing used gas-forming agent gradually diffuses from the pores of the foamed product and its place in the pores gradually diffuses the air. Previously it was thought that only galoidzamyescyennykh hydrocarbon blowing agent, namely dichlorotetrafluoroethane able to provide for what the R materials low density polyethylene resins. In other words, it was believed that upon receipt of foamed material without the use of a permeability modifier or stabilizing reagent only dichlorotetrafluoroethane diffuses from the pores of the foamed material are slow enough to prevent the destruction of the walls of the pores in the slow process of diffusion of air in the pores.

Subsequently, in an attempt to slow down the diffusion of the gas-forming reagents from the pores of the foam and, through this, to minimize shrinkage pore foam material, have been developed are introduced into the polyolefin modifiers permeability or stabilizing agents. In the framework of this application, the terms "permeability modifier" and "stabilizing agent" will be used interchangeably.

As shown in the hereinafter enumerated patents, there are several different types of stabilizing reagents used to minimize shrinkage of the pores or the destruction of the pores in the foamed material.

In U.S. patent N US 3644230 discusses how to prevent extrusion of the destruction of the pores in the foam at the final stage by introducing a small amount of partial esters of long-chain fatty acids with high molecular weight alcohol is n-vinyl copolymers at the final stage by introducing a small amount of partial esters of long-chain fatty acids with high molecular weight alcohols.

In U.S. patent N US 4214054 discusses the production of foam using volatile hydrocarbon blowing agents. The polyolefin composition before foaming expansion impose modifiers permeability type amides of saturated higher fatty acids, saturated higher aliphatic amines and complete esters of saturated higher fatty acids.

In U.S. patent N US 4217319 as a blowing agent for expanding the polyolefin discusses the use of volatile organic compounds with an ester of long-chain fatty acid and a polyhydric alcohol as a permeability modifier or stabilizing reagent that prevents shrinkage of the expanded polyolefin.

In U.S. patent N US 4331779 discussed copolymerizable with ethylene polyethylene with an unsaturated carboxylic acid as a stabilizing reagent

In U.S. patent N US 4347329 discusses the use of fatty acid amide such as stearamide, for use in the foam as a stabilizing reagent. Further, U.S. patent N US 4368276 and 4395510 discusses the use of reagents that modify the stability, in the form of an amide of a fatty acid to produce penopoliuretan the 027 discusses the use of fatty acid amide, such as stearamide, as a stabilizing reagent for use in the foam, blown gas-forming reactants selected from the group consisting of (I) isobutane, (II) a mixture of 5%-95% isobutane on a molar composition and 95%-5% physical reagent selected from the group consisting of HCFC and ftoruglevodorodnye and (III) a mixture of at least 70% isobutane with other hydrocarbons, chlorohydrocarbons and chlorofluorocarbons.

In U.S. patent N US 5424016 discusses the application of permeability modifiers, such as amides and esters of fatty acids, in an amount sufficient to prevent substantial shrinkage of the structure of the foamed structure.

The use of such modifiers permeability allows you to apply over a wide range of volatile blowing agents. In most cases, in the production of competitive foam when used in conjunction with a stabilizing reagents can be restricted to a cheaper gas-forming reagents, such as isobutane.

Although discussed in these patents stabilizing reagents can be useful to minimize shrinkage of the foam, blown fugitive after cooling. In the framework of this application, the term "expansion after cooling" will refer to the expansion of the foam material in atmospheric conditions after cooling. Regardless of any particular theory mentioned that the expansion after cooling is determined by the residual gas-forming reagent released from the polymer structure, forming pores, into the open area of the pores with a higher speed compared to its ability to diffuse out of the pores.

Expansion after cooling leads to many problems. The process in the foamed material after foaming is determined by the sizing and voltage caused by the expansion after cooling. In particular, regardless of extruded whether foamed material in strips, sheets, or any other shape, sizing foamed material is reflected in the heterogeneity and unpredictability generated by this product. This effect is most sharply manifested in layered form, in which the change in the size of the foamed material after cooling can cause cumulative change.

When the foamed material is wound in the form of a sheet on the drum, the layers of foam material on the outer kolichestvo foam material is thinner than its extruded thickness. So, for example, sheet, extruded with a thickness of 6 mm and is wound into a roll, may increase in thickness to approximately 8 mm in the outer layers, while the inner layers will be compressed to about 5 mm depending on the specifics of the type of foamed material, up to 50-60% of the roll can be compressed to a thickness less than the thickness of the cooled extruded foamed material. This change in thickness and voltage in a coil of foam material makes it difficult to cut sheets from a roll. In particular, after otmuchivanie and cut the foam material from a roll he can show a tendency of growth, shrinkage and/or softening, which leads to changes in the thickness, width and/or length of the cut sheet.

In line with this, there is still a need in the technology for production of foam of relatively low density with a high degree of dimensional stability after cooling with minimal shrinkage and expansion. This circumstance, as well as other objectives of the invention, and achieved advantages will be apparent from the further detailed description.

These tasks were solved according to the present image is hereinafter referred to for brevity stabilizing agent), which minimizes shrinkage and expansion of the foam after cooling.

In another aspect of the present invention is reduced to a polyolefin composition with the above combined stabilizing reagent (B), which, in addition, contains a gas-forming agent (b) and therefore capable of expansion to form products with increasing size (for example, foamed polymer) from the specified polyolefin composition.

And, finally, a particularly important aspect of the present invention is to provide a method for improving dimensional stability after cooling, both from the point of view of shrinkage, and from the point of view of expansion compared with the freshly prepared foam by the introduction of a stabilizing composition.

The preferred embodiment of the present invention is capable of foaming polyethylene composition comprising gas-forming agent containing isobutane, and an adequate amount of the combined stabilizing reagent containing glycerol monostearate, glycerol distearate or mixtures thereof and stearyl stearamide present in the component range, of sufficient size in the range of about 10%, preferably about 7.5%, more preferably about 5% from its initial foam volume at atmospheric conditions.

Olefin polymers suitable for implementing the present invention, include any capable of extruding and foaming a composition of one or more polyolefin materials such as resin. Preferably, the polyolefin resin (hereinafter in the description and the claims also referred to as a polyolefin or A) had a softening temperature of less than 130oC coefficient melting point of from about 0.02 to about 2 g/min, more preferably 0.03 to about 0.6 g/min, and a density from about 0.910 to about 0,940, more preferably from about 0,916 to approximately 0,925 g/cm3.

The olefinic polymer may be preferably selected from the group consisting of medium density polyethylene, low density polyethylene, linear low density polyethylene, polyethylene catalyzed by metallocenes, polypropylene, polybutylene and copolymers of olefin monomers with a number from 2 to about 8 carbon atoms, including ethylene copolymers containing mensage number of monomer, capable of copolymerization with ethylene and mixtures of ethylene homopolymer or copolymer, in the amount of at least 50 percent by weight, preferably at least 60% by weight, with another compatible polymer. In addition, when implementing the present invention can be used in mixture of two or more of these polyolefin resins (A), in particular copolymers of ethylene with vinyl acetate. Olefin polymer is preferably selected from the group consisting of low density polyethylene, linear low density polyethylene, polyethylene catalyzed by metallocenes, copolymers of ethylene-vinyl acetate and mixtures thereof. The preferred polyolefin is low density polyethylene, linear low density polyethylene or mixtures thereof.

Examples of copolymers that are compatible with ethylene and other olefins include vinyl acetate, vinyl chloride, propylene, butene, hexene, acrylic acid and its esters, methacrylic acid and its esters, etc., but not organicists these compounds. Another polymer that is miscible with ethylene homopolymer or copolymer can be any compatible polymers, including polypropylene, polybutadiene, polyisoprene, on alien, the copolymer is a vinyl acetate/ethylene copolymer Acrylonitrile/butadiene, a copolymer of vinyl chloride/vinyl acetate, etc., but is not limited to these compounds.

Polyolefin composition is extended with the formation of polymeric foamed material with a substantially closed pores by thermal plasticization of the polymer resin mixed with retinoid combination stabilizing and gas-forming reagents, with further activation of gas-forming reagents by placing the mixture in a zone of low pressure (e.g. atmospheric pressure) to cause expansion of the mixture to the state penopoliuretana with a substantially closed pores. Using the process according to the present invention obtain a foam having a density in the range of from about 8 to about 334 kg/m3. Foamed materials preferably have a density in the range of from about 10 to about 250 kg/m3and more preferably from about 15 to about 150 kg/m3.

Gas-forming reagents in the compositions and processes according to the present invention are conventional gaseous elements, compounds or mixtures thereof. Some gas-forming reagents, and this should not be construed as limiting the invention only to these gas-forming reagents.

Among the gaseous elements, which can be applied with satisfactory results, are nitrogen, argon, neon and helium. Additionally, there may be used conventional gaseous organic compounds. The most typical of them are the halogen derivatives of methane and ethane, used as refrigerants and for other purposes this kind of, such as Trichlorofluoromethane (CFC-11), DICHLORODIFLUOROMETHANE (CFC-12), dichlorotetrafluoroethane (CFC-114), divorcecelebration (CFC-122), Chlorodifluoromethane (HCFC-22), 1,1-dichloro-2,2,2-trifluoroethane (HCFC-123), 1-chloro-1,2,2,2-Tetrafluoroethane (HCFC-124), 1,1,2,2,2-pentaborate (HCFC-125), 1,2,2,2-Tetrafluoroethane (HFC-134a), 1,1-dichloro-1-monitorate (HCFC-141b), 1-chloro-1,1-differetn (HCFC-142b), 1,1-differetn (HFC-152a), ethyl chloride, methyl bromide, methyl chloride, etc., and mixtures of any two or more of the above compounds.

Other conventional gaseous compounds, which can be used are acetylene, ammonia, butadiene, normal butane, butene, carbon dioxide, nitrous oxide, cyclopropane, dimethylamine, 2,2-dimethyl propane, ethane, ethylene, isobutane, isobutylene, methane, monomethylamine, propane, propylene and trimethylamine.

Gas-forming agent preferably is selected from the group consisting of (what aemula from the group consisting of chlorofluorocarbons and fluorocarbons having from 1 to 4 carbon atoms, (III) a mixture of at least 5%-95% isobutane with a 95%-5% physical gas-forming reagent selected from the group consisting of hydrocarbons, chlorohydrocarbons and chlorofluorocarbons having from 1 to 5 carbon atoms, and (IV) physical gas-forming reagent, composed of one or more components selected from the group consisting of hydrocarbons, chlorohydrocarbons and chlorofluorocarbons having from 1 to 15 carbon atoms.

All the above materials are covered by the term "normal gaseous expanding medium". It is implied that this term means the following: applied expanding medium is a gas at the temperatures existing in the normal operating conditions of the extruder with a plastic matrix. Furthermore, when reference is made to the introduction of conventional gas expanding environment or gas in a plastic compound in the extrusion cylinder, it should be understood therefore that the introduction of the material, which is a gas at normal working temperatures of the extruder, it can be either in gaseous or in the liquid state at the temperature and pressure at the s, which when introduced into the extrusion cylinder are liquids, because to pump fluid at constant pressure and volume easier than under the same conditions apply gas.

Examples of liquids that can be used as blowing agents include hydrocarbons such as pentane, hexane, heptane or octane; such unsaturated hydrocarbons, as penten, 4-methyl pentan, hexene or essential fraction of gasoline; such esters as diethyl ether; alcohols such as methanol or ethanol; ketones such as acetone or methyl ethyl ketone; such kaleidophone hydrocarbons as carbon tetrachloride, chloroform, ethylene dichloride, methylene chloride or 1,1,2-trichloro - 1,2,2-trifluoroethane.

Other blowing agents which can be used in addition to conventional volatile gases are chemical gas-forming reagents that decompose at elevated temperatures to free Gaza. These gas-forming reagents include azodicarbonamide, p-toluene sulfonyl hydrazide, dinitrosopentamethylene, mixtures of sodium bicarbonate and citric acid, gypsum, various hydrates of aluminum, such as aluminum trihydrate, bergerat sodium, etc.

Gas-forming reagents usually is notizie may also contain other ingredients, such as fillers, stabilizing agents, antioxidants, agents antistatic agents, flame retardant additives, seed reagents, lubricants, foaming additives, reagents, dyes, inhibitors, aging, etc., Capable of foaming compositions of polyolefins and their copolymers, gas-forming reagents and additives, such as stabilizing reagents, reagents, antistatic agents, flame retardant agents and so on, are well known in the art, representative examples of such compositions are given in U.S. patent N US 3644230, 4214054, 4640933, 4633361 and 4694027, while disclosed in these patents technology included in this description by reference.

Typically, to prevent the destruction of the foam material to many foam added stabilizing agents. The combination of stabilizing agents suitable for use in the framework of the present invention includes a partial esters of long-chain fatty acids with high molecular weight alcohols described in U.S. patent N US 3644230, in combination with at least one of the highest bonds alkylamines, fatty acid amides and/or complete esters of higher fatty acids, such as objects, described in U.S. patent N US 4214054. Partial esters of fatty cisleithania (hereinafter referred to as, as component B1) are members of the General class known as surface-active agents, or surfactants. The preferred class of surfactants includes, for example, a partial ester of a fatty acid having from 12 to 18 carbon atoms, and high molecular weight alcohol having from three to six hydroxyl groups. More preferred partial esters of long-chain fatty acid component of high molecular weight alcohol within the combined stabilizing agent is glycerol monostearate, glycerol distearate or mixtures thereof.

Another component of the combined stabilizing reagent (hereinafter also referred to as component B1) may be selected from the group consisting of higher alkyl amines, fatty acid amides and/or complete esters of higher fatty acids. Typical examples of the higher alkyl amines, which may be useful as a component of the stabilizing mixture of reagents may include dodecyl amine, tetradecyl amine, hexadecyl Amin, octadecyl Amin, eicosyl Amin, docosyl amine, N-methyl dodecyl amine, N-methyl octadecyl amine, N - ethyl of octadecyl amine, dodecyl propylene diamine, tetradecyl propylene diamine, hexadecyl propylene diamine, octadecyl propylene diamine, N, N-dimethyl octadecyl propylene diamine, hexadecyl ethylene diamine, octadecyl ethylene diamine, N-methyl hexadecyl ethylene diamine, N-methyl octadecyl ethylene diamine, etc. are Typical examples of derivatives of saturated higher aliphatic amines are polyoxyethylene myristyl amine, polyoxyethylene palmityl amine, polyoxyethylene stearyl Amin, polyoxypropylene palmityl Amin, polyoxypropylene stearyl Amin, myristyl amine acetate, palmityl amine acetate, stearyl amine acetate, polyoxyethylene lauryl amine mono(and di-)palmitate, polyoxyethylene lauryl amine mono(and di-)stearate, polyoxyethylene palmityl amine mono(and di-)palmitate, polyoxyethylene palmityl amine mono(and di-) stearate, polyoxyethylene stearyl amine mono(and di)palmitate, policitian stearyl amine mono(and di-)stearate, N-methyl polyoxyethylene stearyl Amin palmitate, N-ethyl polyoxyethylene stearyl amine stearate, lauryl mono(and di-)ethanolamine palmitate, lauryl mono(and di-)ethanolamine stearate, palmityl mono(and di-) ethanolamine palmitate, palmityl mono(and di-)ethanolamine stearate, stearyl mono(and di-)ethanolamine palmitate, stearyl mono(and di-) ethanolamine stearate, dodecyl propylene diamine oxyethylene product fitting, hexadecyl propylene diamine oxyethylene product is l propylene diamine mono(and di-)palmitate, polyoxyethylene hexadecyl propylene diamine mono(and di-)stearate, polyoxyethylene octadecyl propylene diamine mono(and di-)palmitate, polyoxyethylene octadecyl propylene diamine mono(and di-)stearate, etc.

Typical examples of amides of saturated fatty acids suitable for use within the present invention include amide and lauric acid amide ministerului acid, palmitic acid amide, stearic acid amide, amide arachnid acid (eicosenoic amide), the amide beganovi acid (dolinoy amide), amide N-methyl stearic acid amide and N,N-dimethyl stearic acid amide di-lauric acid amide di-palmitic acid amide di-stearic acid amide three-lauric acid amide three-palmitic acid, amide three-stearic acid and so on, Examples of derivatives of amides of saturated higher fatty acids may include mono(and di-)of ethanolamide lauric acid mono(and di-)of ethanolamide myristic acid mono(and di-)of ethanolamide palmitic acid mono(and di-)of ethanolamide stearic acid mono(and di-)of ethanolamide arachnid acid mono(and di-)of ethanolamide beganovi acid mono(and di-)of ethanolamide lignocellulose acid, mono-isopropanolamide lauric acid, mono - sopracitati, polyoxyethylene myristic acid amide, polyoxyethylene palmitic acid amide, polyoxyethylene stearic acid amide, polyoxyethylene amide arachnid acid, mono-ethanolamide di-lauric acid, mono - ethanolamide di-myristic acid, mono-ethanolamide di - palmitic acid, mono-ethanolamide di-stearic acid, mono-ethanolamide di-arachnid acid, polyoxyethylene amide di - stearic acid, polyoxyethylene amide and lauric acid. mono - stearate, polyoxyethylene stearic acid amide.mono-stearate, etc.

Typical examples of complete esters of saturated higher fatty acids suitable for use in a combined stabilizing reagent according to the present invention include polyoxyethylene di-myristate, polyoxypropylene di - myristate, polyoxyethylene di-palmitate, polyoxypropylene di - palmitate, polyoxyethylene di-stearate, polyoxypropylene di-stearate, polyoxyethylene di-Arahat, polyoxyethylene di-beginat, ethylene glycol di-myristate, ethylene glycol di-palmitate, ethylene glycol di - stearate, ethylene glycol di-Arahat, ethylene glycol di-beginat, tri - glycerides of lauric acid, tri-glycerides myristic acid, tri-glycerides of palmitic acid, triglyceride 1,3-stearo-2-myristic acid, sorbitan Tetra-palmitate, sorbitan Tetra - stearate, tri-glycerides of 12-hydroxy stearic acid, sorbitan Tetra-12 - hydroxystearate, tri-glycerides, mono-stearic acid-di-12 - hydroxy-stearic acid, polyoxyethylene glycerin tri - stearate, polyoxyethylene glycerol tri-12-hydroxystearate, polyoxyethylene sorbitan Tetra-stearate, polyoxyethylene sorbitan Tetra-12-hydroxystearate, polyoxyethylene tri-glycerides, mono - stearic acid-di-12-hydroxy stearic acid, etc.

Preferably the combined stabilizing reagent will contain compounds that are partial esters of long-chain fatty acids with high molecular weight alcohols, preferably glycerol-monostearate, glycerol-distearate or mixtures thereof, in combination with compounds that are inorganic salts of N-substituted fatty acids, preferably inorganic salts of fatty acids selected from the group consisting of N-stearyl stearamide, N-palmityl stearamide, N - palmityl palmitate or mixtures thereof, most preferably stearyl stearamide.

The components of the stabilizing agent can be either pre-mixed or added to the olefin composition separately. Stabilizing reagent prisutstvie foam material and prevent dimensional changes in the foamed material after cooling, in particular in freshly foamed material, for which such changes are most typical. Combined roll can be applied in the amount and ratio of the components, effectively stabilizing the foamed material so that its expansion will be less than 10%, preferably less than 7.5%, more preferably less than 5% of its original size in the foamed state at atmospheric conditions. This combined stabilizing reagent in the typical case will be present in the olefin composition in an amount of from 0.1% to 15% relative to the weight of the polymer resin. Preferably the stabilizing agent will be present in an amount of from about 0.1% to about 7%, more preferably from 0.1% to about 3% relative to the weight of the polymer resin.

Combined stabilizing reagent will contain at least one component (component B1) of the partial esters of long-chain fatty acids with high molecular weight alcohols and component (component B1) selected from the group consisting of higher alkyl amines, fatty acid amides, and/or complete esters of higher fatty acids, in an amount at least sufficient for suseragent typically will contain at least 50% of partial esters of fatty acids with high molecular weight alcohols and at least part of the remaining shares, containing a component selected from the group consisting of higher alkyl amines, fatty acid amides and/or complete esters of higher fatty acids. Preferably the stabilizing agent will contain from about 60% to about 95% of a partial ester of fatty acid component consisting of high molecular weight alcohols, more preferably from about 70% to about 90%, and from about 5% to about 40% of a component selected from the group consisting of higher alkyl amines, fatty acid amides and/or complete esters of higher fatty acids, more preferably from about 10% to about 30%.

Reagents-antistatic agents are usually added and mixed into the polyolefin resin prior to extrusion, but the process described here is not limited in this way. Examples of reagents antistatics are presented but are not limited to the following list: anionic surfactants such as alkyl sulfates, alkyl sulfonates, alkyl benzene sulfonates, sulfosuccinate, as well as esters of aliphatic alcohols, phosphoric acid and phosphates; cationic surfactants such as salts of primary amines, salts of secondary amines, salts of tertiary amines, Quaternary ammonium compounds and proizvodnue.doc fatty acids, alkylen oxide adducts of alkylphenol and alternately, alkylene oxide adducts of polyols, alkylene oxide adducts of aliphatic amines and aliphatic amides, polyethylene glycol, and copolymers of polyethylene glycol and propylene glycol. Nonionic - anionic surfactants, such as mono - and diesters of polyoxyethylene alkyl esters, sulfates, polyoxyethylene alkyl ethers and polyoxyethylene sulfates alkyl phenol ethers suitable as well as amphoteric surfactants such as the alkyl betain and imidazoline derivatives. One or more of these or other reagents-antistatics added in an amount of from 0.05 to 10 parts, preferably from 0.2 to 3 parts per 100 parts of polyolefin.

Flame retardant additives are usually added and mixed into the polyolefin resin prior to extrusion, but the described process is not limited in this way. Examples of usable fire proofing additives include halogenated organic bromide and chloride compounds such as chloroparaffin. Preferably a flame retardant additive contains at least 50% by weight of bromine or chlorine. Examples of preferred bromidic connections: 1,2,5,6,9,10 - hexabromocyclododecane; tetrabromobenzoate; pentabromodiphenylether)-1,3,5-triazine; tetrabromide; bromotrichloromethane; 1,2,5,6-tetrabromoethane; hexabromobenzene; pentabromophenol; pentabromodiphenylether; Tris- (dibromopropyl)phosphate; octabrominated; octabromodiphenyl oxide; 2,4,6-tribromophenol; decabromodiphenyl oxide; bis(tri - bromophenoxy)ethylene and does not depend. More than one of these, and other flame retardants are often used in mixtures with antimony trioxide or antimony pentoxide to obtain a synergistic effect.

As was explained, an important feature of the present invention is the ability to use capable of foaming olefin composition cheap gas-forming reagents, such as isobutane. Isobutane may be used as the sole blowing agent. In order alternatives to gas-forming reagent may contain a mixture of one or more of the above conventional gas-forming reagents. In the practical application of the present invention gas-forming agent is introduced into the polyolefin composition in such proportions to provide the desired degree of expansion in the final foamed porous product, usually up to 60-fold increase volume, in order to obtain products with the density of the foam material during the term of ieagent final foamed products according to the present invention can have a relatively low density foam material, for example, from about 9.6 to about 240 kg/m3. Useful proportions of such gas-forming reagent compositions capable of fluidity and foaming gel be on the order of from about 0.013 to about 0.50 gram-mole per 100 grams of the original resin. The maximum useful proportion of gas-forming reagent capable of foaming gel also depends on the pressure which acts on the gel in the extruder and the extrusion head, as well as in the connecting channel. The level of gas-forming reagent above, when the pressure of the extruder head is relatively large, i.e. when the diameter of the decoration of the channel head is relatively small and/or the performance of the process is relatively high.

Gas-forming agent is introduced into the olefin composition in a way suitable to obtain a gel capable of yield, preferably in a continuous mode, for example, in the mixing extruder that uses heat to the plasticization of the resin mixture, the pressure to maintain the blowing agent in negators condition and mechanical load to ensure complete mixing of the resin and blowing agent. The resulting gel then cooling the izkuyu pressure, for example, with a normal temperature of outside air, where the gel expands to the formation of porous mass with a lower density. In the form of a foamed extruded forms it is removed from the extruder, give it reaches the solid state resin mixture and store for further processing, storage and subsequent use.

In addition to those described here and above ingredients in practical applications of the present invention can be used also other ingredients and additives commonly used in known extrusion foaming processes, such as, for example, famous bare (or regulating the pore size) reagents (e.g., talc, clay, mica, silica, titanium oxide, zinc oxide, calcium silicate, metal salts of fatty acids, such as barium stearate, zinc stearate, aluminum stearate, and so on), wetting agents, reagents, antistatics, flame retardant reagents, etc.

The following examples in which all proportions and percentages are given by weight, unless other designations presented only to illustrate the present invention and should not be interpreted as limiting its scope.

Examples

The polyethylene is to 0.92 g/cm3, isobutane (HC) gas-forming agent in a quantity sufficient to obtain a foam material with a density of 35 kg/m3and a stabilizing reagent or combination of reagents, the type and amount of which are shown in the table, introduced in the extruder to obtain a continuous sheet of foamed material, the measured thickness of which is given in the table. As a reagent, regulating the pore size was also added talc. The samples were kept, and their thickness measured with a micrometer as immediately after production and after changing their dimensions after cooling reached a maximum (i.e., after the expansion or shrinkage).

The results in table show that the dimensional stability of samples containing as the sole stabilizing reagents only Atmos-150 or Kemamide S-180, unsatisfactory. The samples made with Atmos-150, extended at the final stage, on average, 18,33%, while the samples made with Kemamide S-180, showed shrinkage in average 20,82%. Nevertheless, the results demonstrate that the introduction of a combination of two stabilizing reagents significant improvement. In particular, the results show that when used in the nom, having stable dimensions and experiencing only minimal resizing, i.e. on average 4,69%.

Description of the specific compositions are given only to facilitate the understanding of the essence of the present invention. Possible modifications within the scope of protection of the invention will be obvious to specialists. Therefore, the scope of protection of the invention is defined solely by the attached claims.

1. Expanded onto a polyolefin composition comprising A. a polyolefin resin, B. combined stabilizing reagent Century gas-forming agent, wherein the combined stabilizing reagent contains a component ABOVE, including at least one connection, which represents a partial ester of a fatty acid with a polyhydric alcohol, a component of COMMITMENT, including at least one compound selected from the group consisting of higher alkyl amines, fatty acid amides and/or complete esters of higher fatty acids.

2. The composition according to p. 1, characterized in that it specified a combined stabilizing agent is present in an amount of 0.1 - 15% by weight relative to the weight of the polymer resin.

3. The composition according to p. 2, characterized in, about 0.1 to 3%, by weight relative to the weight of the polymer resin.

4. Composition according to any one of paragraphs.1 to 3, characterized in that there is a component ABOVE is a partial ester of a fatty acid having 12 to 18 carbon atoms, and high molecular weight alcohol having from three to six hydroxyl groups, preferably glycerol monostearate, glycerol distearate or mixtures thereof.

5. Composition according to any one of paragraphs.1 to 4, characterized in that it is a component of COMMITMENT is an amide and N-substituted fatty acids.

6. The composition according to p. 5, characterized in that it is a component of COMMITMENT is an N-stearyl stearamide, N-palmityl stearamide, N-palmityl palmitate or mixtures thereof, preferably stearyl stearamide.

7. The composition according to p. 6, characterized in that it specified a combined stabilizing agent is present in an amount of 0.1 - 7% by weight relative to the weight of the polymer resin.

8. Composition according to any one of paragraphs.1 to 7, characterized in that it specified a combined stabilizing reagent contains at least approximately 50% of compounds of the component from ABOVE.

9. The composition according to p. 8, characterized in that it specified a combined stabilizing reagent, the compounds of the component from ABOVE and from about 5% to about 40%, preferably from about 10% to about 30% of the compounds of the component COMMITMENT.

10. Expanded onto a polyolefin composition comprising A. a polyolefin resin on the basis of polyethylene, B. combined stabilizing reagent Century gas-forming agent, wherein the polyolefin resin is selected from the group consisting of low density polyethylene, linear low density polyethylene and mixtures thereof, combined stabilizing reagent contains a component ABOVE, including at least one connection, which is a partial ester of a fatty acid having 12 to 18 carbon atoms, and high molecular weight alcohol having from three to six hydroxyl groups, COMMITMENT component comprising at least one connection, which Amida N-substituted fatty acids, gas-forming agent contains isobutane, with specified stabilizing agent is present in an amount of 0.1 - 3% by weight relative to the weight of the polymer and contains from about 60% to about 95% of the compounds of the component from ABOVE and from about 5% to about 40% of compounds of the component COMMITMENT.

11. The composition according to p. 10, characterized in that there is a component ABOVE is a glycerin mo is omponent COMMITMENT is an N-stearyl stearamide, N-palmityl stearamide, N-palmityl palmitate or mixtures thereof, preferably stearyl stearamide.

13. The product of foamed polyolefin with essentially closed-cell foam, having a density of from about 10 to about 250 kg/m3and composed of a resin composition containing a polyolefin, B. combined stabilizing reagent, characterized in that the combined stabilizing reagent contains a component ABOVE, including at least one connection, which is a partial ester of a fatty acid having 12 to 18 carbon atoms, and high molecular weight alcohol having from three to six hydroxyl groups, COMMITMENT component comprising at least one compound selected from the group consisting of higher alkyl amines, fatty acid amides and/or complete esters of higher fatty acids.

14. The article on p. 13, characterized in that it specified a combined stabilizing agent is present in an amount of 0.1 - 15%, preferably 0.1 to 7%, by weight relative to the weight of the polymer.

15. The product under item 13 or 14, characterized in that it specified a combined stabilizing reagent contains at least about 50% soedinenii stabilizing reagent contains from about 60% to about 95%, preferably from about 70% to about 90%, of compounds of the component from ABOVE and from about 5% to about 40%, preferably from about 10% to about 30% of the compounds of the component COMMITMENT.

17. Combined stabilizing agent for foam, characterized in that it contains a component ABOVE, including at least one connection, which is a partial ester of a fatty acid having 12 to 18 carbon atoms, and high molecular weight alcohol having from three to six hydroxyl groups, COMMITMENT component comprising at least one compound selected from the group consisting of higher alkyl amines, fatty acid amides and/or complete esters of higher fatty acids, with the specified combined stabilizing reagent contains from about 60% to about 95% compounds of the component from ABOVE and from about 5% to about 40% of compounds of the component COMMITMENT.

18. Combined stabilizing reagent under item 17, characterized in that it contains from about 70% to about 90% of compounds of the component from ABOVE and from about 10% to about 30% of the compounds of the component COMMITMENT.

19. Combined stabilizing reageert or mixtures thereof.

20. Combined stabilizing reagent according to any one of paragraphs.17 to 19, characterized in that it is a component of COMMITMENT is an amide and N-substituted fatty acids.

21. Combined stabilizing reagent under item 20. characterized in that it is a component of COMMITMENT is an N-stearyl stearamide, N-palmityl stearamide, N-palmityl palmitate or mixtures thereof, preferably stearyl stearamide.

22. The method of preparation of penopoliuretana with a substantially closed pores, with dimensional stability after cooling, comprising a stage of mixing and heat plasticization: A. polyolefin resin B. the combined stabilizing reagent Century gas-forming reagent and activation of blowing agent for foaming the resulting mixture to the state of foamed material, characterized in that the combined stabilizing reagent contains a component from ABOVE, representing a partial ester of a fatty acid having 12 to 18 carbon atoms, and high molecular weight alcohol having from three to six hydroxyl groups; COMMITMENT component comprising at least one compound selected from the group consisting of higher alkyl amines, amides ine foam material with a substantially closed-cell foam, having a density of from about 10 kg/m3to about 250 kg/m3.

23. The method according to p. 22, characterized in that it specified a combined stabilizing agent is present in an amount of 0.1 - 15%, preferably 0.1 to 3%, by weight relative to the weight of the polymer resin.

24. The method according to p. 23, characterized in that it specified a combined stabilizing reagent contains at least approximately 50% of compounds of the component from ABOVE.

25. The method according to p. 23 or 24, characterized in that it specified a combined stabilizing reagent contains from about 60% to about 95%, preferably from about 70% to about 90%, of compounds of the component ABOVE from about 5% to about 40%, preferably from about 10% to about 30%, of compounds of the component COMMITMENT.

26. The method according to any of paragraphs.22 to 25, characterized in that it is a component ABOVE is a glycerin monostearate, glycerin distearate or mixtures thereof.

27. The method according to p. 26, characterized in that it is a component of COMMITMENT is an amide and N-substituted fatty acids.

28. The method according to p. 27, characterized in that it is a component of COMMITMENT predstava by p. 25, characterized in that it specified the polyolefin is a low density polyethylene, linear low density polyethylene or a mixture thereof, and the ABOVE is stearamide.

 

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