Polymer composition


(57) Abstract:

Usage: composition with high mechanical and rheological properties suitable for repeated processing. The inventive composition containing polystyrene reinforced diene rubber and linear blockcopolymers diene with styrene, polyethylene and block copolymers of a diene with styrene, as it contains polystyrene polystyrene reinforced 5 - 12 % polybutadiene rubber and 0.5 to 5 % linear blockcopolymer mol. m 75,000 containing 25 to 75 % of polystyrene, and as blockcopolymer diene with styrene linear block copolymers of 20 to 80 % polybutadiene (mol. m 5,000 - 150,000 and 80 to 20 % polystyrene (mol. m 5,000 - 150,000 in the following ratio, wt. %: toughened polystyrene 10 - 90; polyethylene 5 - 50; linear block copolymers 5 - 40. table 4.

The invention relates to blends based vinylaromatic polymers having high mechanical characteristics, and preserving properties after processing at temperatures exceeding 200oC.

Composition based on vinylaromatic polymers possess high mechanical and rheological properties and suitable for the production of shaped products with the practical polymers are thermoplastics, recyclable when heated by injection molding or extrusion. These polymers have a pretty good tensile strength, but they are not suitable in the case of requirements for tensile strength combined with good chemical resistance.

Closest to the proposed technical substance is a polymeric composition containing a polyolefin, vinylaromatic polymer and as a compatibility agent between the polyolefin and vinylaromatic polymer, conjugated with vinylaromatic polymer, conjugated with vinylaromatic diene monomer star-shaped block copolymers.

The above mixture is suitable for processing into shaped articles by injection molding, extrusion and/or by forming a sheet of thermoplastics, however, they have some drawbacks that limit their use in such processes.

The main disadvantage of them is that technological waste cannot be reused due to the sharp deterioration of the mechanical properties of the mixture, in particular because of the ability to elastic deformation and relative elongation at break.

The purpose of izobreteny the results achieved thermoplastic polymer composition, contains:

10 to 90 wt. vinylaromatic polymer (A), hardened linear blockcopolymer vinylaromatic monomer and diene and 5 12 polybutadiene rubber;

5 to 50 wt. polyethylene (b) and

5 40 wt. linear blockcopolymer (C) vinylaromatic monomer containing a diene in the range of 20 to 80 wt.

the sum of all three components (A), (b) and (C) is equal to 100.

Preferably the polymer composition according to the present invention contains:

60 to 80 wt. vinylaromatic polymer (A);

10 to 30 wt. polyethylene (b) and

from 5 to 30 wt. linear blockcopolymer (C), the sum of components (A), (b) and (C) is equal to 100.

Vinylaromatic polymer (A) can be obtained by polymerization of a monomer having the General formula


in which R denotes a hydrogen atom or an alkyl radical containing 1 to 4 carbon atoms, p is 0 or an integer from 1 to 5, and Y denotes a halogen atom or an alkyl radical containing 1 to 4 carbon atoms, in the presence of polybutadiene rubber and linear blockcopolymer using a radical initiator.

Examples vinylaromatic compounds having the above General formula are: styrene, methylsterol, mo is sootvetstvuyushie alphamethylstyrene, such as ortho - and para-methylstyrene, ortho - and parameterstyle, ortho - and para-methyl-alphamethylstyrene.

The monomers can be used in mixtures with each other or with other copolymerizable the comonomers such as maleic anhydride, Acrylonitrile, Methacrylonitrile, complex alkalemia esters with C1-4acrylic or methacrylic acid.

Used Dianova rubber is preferably present in an amount of 7 to 12 wt. and may be a polybutadiene, polybutadiene with a high or medium CIS - and low viscosity.

Linear block copolymers vinylaromatic monomer and the conjugated diene is preferably contained in the range of 2 to 5 wt. and has a molecular mass equal to 75,000.

These linear block copolymers containing 20 to 75 wt. polystyrene and 80 respectively 25 wt. the conjugated diene.

These copolymers can contain arbitrary or cone-shaped polymer segment (B/S) or arbitrary and/or tapered copolymers.

Linear blakolmer of this type available on the market, for example, in the form of "SOLPRENER1205", "SOLPRENER308", and "SOLPRENE 314", manufactured and sold by Phillips petroleum.

Photopolymerization in mass.

The preferred method of preparation consists in carrying out prepolymerisation aromatic monomer in the presence of a radical initiator, a diene rubber and the above blockcopolymer in the first reactor to achieve the conversion of the monomers under 50

The polymerization is completed in one or more subsequent reactors until complete conversion of the monomers. The polymer is then obzharivayut and granularit.

The polyolefin (B) preferably is a polyethylene containing linear low density polyethylene (LLDPE) medium density and high density.

Linear block copolymers (C), used as an agent compatibility in the composition according to the present invention also relates to a known type available on the market. This block copolymers is of type:

(II) S B;



where S, S1and S2denotes blocks elastomeres vinylaromatic polymer having a mol. m 5,000 150,000.

B, B1and B2denote blocks of elastomeric polymer based on a conjugated diene, having a mol. m 5,000 150,000.

Linear block copolymers (C) and the FL", or trade name, which is proizvodi and implements the firm "FINA".

Linear blakolmer (C), particularly preferred in the compositions according to the invention has the formula (IV) BISIMB2- S2and a molecular weight of from 30,000 to 150,000 and content polybutadiene 40 to 80 wt. In this example, the average molecular weight of the block INIranges from 0.1 to 0.5 times the weight of block B2and the average molecular weight of the block S1varies from 0.25 to 2.0 times the weight of the block S2. In addition, this preferred polymer includes a copolymer segment formed from a statistically linked diene and links vinylaromatic monomer, between blocks BIand

This linear block copolymers manufactured and sold by the firm ENICHEM ELASTOMERI" under the trade name "EUPOPRENERSOLT 168".

The composition according to the present invention can be prepared by mixing the components at a low temperature in any mixer known type. The mixture is then ekstragiruyut in single-spindle and single-spindle extruders at a temperature of preferably 150 250oC.

These compounds may contain a small amount (typically from 0.1 to 3 wt.) is substances, substances that prevent the combustion of the additive to improve the fluidity, antistatic agents, dyes, pigments, blowing agents for the manufacture of low density and semi-finished products, etc. can be added when mixing the components in amounts of 0.1 to 10 wt.

The mixture according to the present invention is easily handled and exhibit properties that are in General much better than the properties of individual components. For this reason, the mixtures according to the invention are used for manufacturing products with high mechanical and rheological properties combined with high chemical resistance.

Therefore, the mixtures according to the invention can be used for the manufacture of electrical appliances, electronics, films, sheets, tapes, strips, rods, boxes, cups, containers, etc.

These compounds can be used to obtain a foam.

An additional advantage of the mixtures according to the present invention is that they retain almost unchanged all mechanical properties even after repeated technological operations at temperatures equal to or exceeding 200oC. Process waste can utilize drum at room temperature to prepare a mixture, consisting of:

75 wt. including high impact polymer (A) containing 7,75 wt. polybutadiene rubber and 3 linear blockcopolymer "SOLPRENER1205", produced and sold by the company, Phillips petroleum, containing 25 styrene and 75 butadiene and having a mol. m 75,000;

15 wt. including linear polyethylene of low density (LLDPE) (B), having a density of 0,926 g/cm3and a melt flow index (M, G, I.) 0.7 g/10 min;

10 wt. including radial blakolmer (C), containing 70 wt. butadiene and 30 wt. styrene containing silicon as a linking moiety, with each polymer block has a molecular weight of 40,000.

The mixture ekstragiruyut of the single-screw extruder BANOERA TR 45 having a diameter of 45 mm

thermal profile of the extruder between the hopper and the extrusion head is 150, 180, 190 and 215oC.

Grain after the first extruding re ekstragiruyut in the same extruder at 240oWith over 55 C.

The capacity for elastic deformation, elongation and rheological properties of the samples was determined after two, four and six extrusion processes carried out in the same extruder and under the same conditions, the ability to elastic deformation 1/01 c notch, determine if 23oWith according to ASTM d 256 samples for testing, having a thickness of 12.7 mm, obtained injection-molded at 190oS, elongation at break are determined according to 638.

The measured properties are shown in table 1.

Example 2. Analogously to example 1 to obtain a mixture, consisting of:

75 wt. including high impact polymer (A) in example 1;

15 wt. including linear polyethylene of low density (LLDPE) (C) of example 1;

10 wt. including linear blakolmer (C) having the structure (IV), containing 57 wt. butadiene and 43 wt. styrene, sold by the firm ENICHEM ELASTOMERI" under the trade name "EUROPRENE8SOLT 168".

Rheological properties, the ability to elastic deformation Izod and properties relative elongation are given in table. 1.

In table. 2 shows the data of examples 3 and 4, the composition obtained in the conditions of example 1.

Using the conditions of the method according to example 1, the resulting polymer composition are shown in table. 3.

In table. 4 shows the data of examples 8 to 10.

Polymer composition comprising polystyrene, reinforced diene rubber and a linear block copolymer of a diene with styrene, polyethylene and a block copolymer Dandenong rubber and 0.5 to 5% linear block copolymer (mol.m. 75,000 containing 25 to 75% of polystyrene, and as the block copolymer of the diene with styrene linear block copolymer of 20-80% polybutadiene (mol.m. 5,000-150,000 and 80-20% polystyrene (mol.m. 5,000-150,000 in the following ratio, wt.

Toughened polystyrene 10-90

Polyethylene 5-50

Linear block copolymer 5-40


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