Moisture-absorbing hot melt glue

FIELD: glues.

SUBSTANCE: invention relates to hot melt glues that are able to absorb aqueous liquids. Glue comprises from about 10% to about 50% of block-copolymer representing linear or radial copolymer structure of the formula: (A-B)x wherein block A represents polyvinylarene block; block B represents poly(monoalkenyl) block; x means number of polymeric links and represents a whole number equal to 1 or above, and from about 20% to about 80% resin enhancing adhesiveness, and from about 1% to about 60% of polymer absorbing an aqueous liquid. Also, invention relates to absorbing article comprising moisture-penetrable upper layer, moisture-proof protecting layer, absorbing member between upper and protecting layers wherein moisture-penetrable upper layer or moisture-proof protecting layer is attached to absorbing member by the proposed hot melt glue. The prepared thermoplastic gluing material can be used for adhesion joining backings and for conferring additional moisture-absorbing capacity to nonwoven materials.

EFFECT: valuable properties of glue.

19 cl, 1 tbl, 12 dwg, 1 ex

 

The present invention relates to a new glue and more particularly to a hot melt glue, which is able to absorb liquid.

Absorbent products such as pads for menstruation, diapers, bandages, pads for nursing and similar articles of a kind normally contain absorbent element. Absorbent element conventional absorbent disposable products, usually formed of fibrous fluff pulp or absorbent non-woven and/or other synthetic or natural absorbent materials such as peat moss or superficiale polymers. Absorbing element is covered with soft, stretchy moisture-permeable top layer, which ensures the absorption of body fluids in retaining the fluid absorbing element. Usually moisture-permeable top layer around the peripheral edges attached with glue waterproof bottom layer, forming a sealing lip, which completely surrounds the absorbent element, thereby preventing leakage of the liquid.

In the manufacture of absorbent products for attaching the moisture-permeable top layer to the absorbent element is usually applied hot melt adhesives, which are also used to attach to the element water resistant bottom layer. In addition, the adhesives th is aciego melt is also used in the manufacture of absorbent structures for laminating multiple layers or to attach with adhesive absorbent particles to the nonwoven material or a fibrous mass.

The aim of the present invention is to provide hot melt glue, which is capable of absorbing aqueous fluids.

Another objective of the present invention is the provision of hot melt glue, the use of which eliminates the risk associated with the formation of the protective layer of the pin holes caused superficiality particles, when the absorbent article is subjected to embossing or education channels.

Another objective of the present invention is the provision of hot melt glue, which eliminates the need for the application of powders during application superficialy particles for absorbing products.

Another objective of the present invention is the provision of hot melt glue, which makes it possible to apply superficiale particles on the substrate.

Another objective of the present invention is the provision of hot melt glue, which also operates as the holding fluid system.

In accordance with the present invention provides a new adhesive hot melt, which is capable of absorbing aqueous fluids.

Glue contains:

from about 10% to about 50% of blockcopolymer;

from about 20% to about 80% increases the adhesiveness of the resin;

from about 1% to about 60% water absorbent liquid polymer.

In accordance with the present which m invention also provides an absorbent article, including vlagopronitsaemym the top layer, moisture-proof protective layer, an absorbent element between the upper layer and the protective layer or the top layer or the protective layer attached to the absorbent element using hot melt glue, which contains:

from about 10% to about 50% of blockcopolymer;

from about 20% to about 80% increases the adhesiveness of the resin;

from about 1% to about 60% water absorbent liquid polymer.

In addition, in accordance with the present invention provides an absorbent article comprising vlagopronitsaemym the top layer, moisture-proof protective layer, an absorbent element between the upper layer and the protective layer, in which at least part of the absorbent element contains adhesive hot melt, which includes:

from about 10% to about 50% of blockcopolymer;

from about 20% to about 80% increases the adhesiveness of the resin;

from about 1% to about 60% water absorbent liquid polymer.

Brief description of drawings

Figure 1 is a top view of a sanitary napkin having a floor with a pattern.

Figure 2 represents a cut of sanitary napkins along the line a-a depicted in figure 1, showing the adhesive applied between the top layer and the absorbent element.

Figure 3 is a top view of a sanitary napkin having a coverage area./p>

Figure 4 is a top view of a sanitary napkin having a foamed adhesive, which forms the side and end seals.

Figure 5 represents a cut of sanitary napkins for line-In, shown in figure 4, showing the adhesive applied on the upper surface of the top layer of the napkin.

6 is a top view of a sanitary napkin having a multi-line adhesive pattern.

Fig.7 represents a cut of sanitary napkins along the line C-C shown in Fig.6, showing the adhesive applied between the protective layer and the absorbing element.

Fig is a top view of a sanitary napkin having adhesive applied in a curved shape adjacent to each longitudinal side edges and opposite transverse ends of the napkin.

Fig.9 is a top view of a sanitary napkin having adhesive applied in a curved shape, which forms a closed perimeter around a Central zone of sanitary napkins.

Figure 10 is a top view of a sanitary napkin having adhesive applied in the form of an hourglass in the Central zone of the napkin.

11 is a top view of a sanitary napkin having adhesive applied in the form of a pair of essentially parallel lines adjacent to each longitudinal side edges of the napkin.

Fig represents a cut of sanitary napkins along the line D-D shown figure 11, showing the adhesive applied between the top layer and the absorbent element napkins.

The present invention relates to hot melt adhesives, and more specifically to hot melt adhesives which are suitable in the manufacture of absorbent products such as pads for menstruation, diapers, tampons for breast cancer, surgical pads and bandages. Unlike conventional hot melt adhesives, which are hydrophobic in nature, the hot melt adhesives of the present invention readily absorb aqueous fluids, such as physiological and menstrual fluid. The hot melt adhesives of the present invention is formed from a mixture containing from about 10% to about 50% of blockcopolymer; from about 20% to about 80% increases the adhesiveness of the resin; and from about 1% to about 60% water absorbent liquid polymer. The hot melt adhesives of the present invention can optionally contain absorbent thermoplastic polymers, superficiale particles, substances for improving adhesiveness and plasticizers.

In a preferred embodiment, the hot melt adhesives of the present invention include (by weight):

about 10-50% of blockcopolymer;

about 20-80% increase adhesiveness of the resin;

about 1-60% of mityayevo water liquid polymer;

about 0-40% of a plasticizer;

about 0-2,0% of an antioxidant.

Suitable for use in the present invention the copolymers include linear or radial copolymer structure having the formula (a-b)xwhere block a is polivinilovym block, the block b is a poly(monoalkylated) block, x represents the number of polymer units and is an integer equal to or more than 1. Suitable polyvinylene block And include, but are not limited to, polystyrene, poly(alpha-methylsterol), polyvinyltoluene and combinations thereof. Suitable poly(monoalkanolamines) blocks block include, but are not limited to, elastomers dienes with conjugated double bonds, such as polybutadiene or polyisoprene or hydrogenated elastomers, such as ethylenebutylene, or propylene, or polyisobutylene, or combinations thereof. Commercial examples of these types of copolymers include the Kraton elastomers™ from Shell Chemical Company, blastomere Vector™ from Dexco, Solprene™ from Enichem Elastomers and Stereon™ Firestone Tire & Rubber Co.

Appropriate enhance the adhesiveness of the resin include natural and modified resins; glycerol and pentaerythritol esters of natural and modified resins; polyterpene resins; copolymers and terpolymer natural terpenes; renamedirectory terpene resins and their hydrogenated produced in the water; aliphatic petroleum resins and their hydrogenated derivatives; aromatic petroleum resins and their hydrogenated derivatives, and aliphatic or aromatic petroleum resins and their hydrogenated derivatives, and combinations thereof. Commercial examples of these types of resins include hydrogenated ester of rosin Foral®, gidrirovannoe modified rosin Staybelite®, primaryservername rosin Poly-pale®, ester of rosin Permalyn®, ester of rosin Pentaiyn®, a modified oil hydrocarbon resin Adtac®, an aromatic hydrocarbon Piccopale®, an aromatic hydrocarbon Piccotac®, a modified aromatic compound aliphatic hydrocarbon Hercotac®, cycloaliphatic resin Regalrez® or Piccolyte® from Hercules, aliphatic hydrocarbons and cycloaliphatic resin Eselementz® from Exxon Chemical, synthetic polyterpene resin including an aromatic modified variants Wingtack® from the Goodyear Tire &. Rubber Co., partially and fully hydrogenated aromatic resin Arkon® from Arakawa Chemicals, modified styrene terpene resin Zonatac®, ester of rosin Zonarez® and ester of rosin Zonester® from Arizona Chemical and modified aromatic compound aliphatic hydrocarbon Nevtac® from Neville Chemical Company.

Suitable water absorbent liquid polymers include thermoplastic hydrogels, such as superficially materials or thermoplastic polim is turning compositions which is formed from water-soluble soft segment and one or more hard segments. The hard segment must be capable of forming from the melt, i.e. at the application temperature of the hard segments in the polymer below the temperature of the melt, and at the operating temperature of the hard segments are above the temperature of the melting point and below the decomposition temperature of any of the other components of hot melt glue. The hard segment is essentially insoluble in water and phase can be separated from the soft segment. Examples of suitable hard segments include, but are not limited to, polyurethane, polyamides, polyesters, polyureas, and combinations thereof. Examples of suitable soft segments include, but are not limited to, polyethylene oxide, polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, polysaccharide, polimolekuly anhydride, random copolymers of polyethylene oxide and polypropyleneoxide and combinations thereof. Soft and hard segments can be covalently linked together by means of urethane, amide, complex, essential communication or connection of the secondary urea or combinations thereof. Examples of the water absorbent liquid thermoplastic polymer compositions that are commercially available include hydrophilic polyurethane from Tyndale Plains-Hunter Ltd. and thermoplastic polymers Aquacaulk® from Sumitomo Seika Chemicals Co., Ltd.

p> Suitable superficiale materials include any of the conventional superficialy particles or superficiale fibers, which are currently commercially available. Ultra-absorbent material preferably is superficiale particles having the average particle size of less than 150 microns. An example of such particles is Aquakeep® J-550P from Absorbent Technologies Inc.

Suitable for use in the present invention, the plasticizers typically include any of the usual plasticizers, which reduce the hardness and modulus increase susceptible to pressure stickiness and reduce the melt viscosity and solution. Preferably, the plasticizer was water-soluble or water-dispersible or alternative represented a substance similar to wax, such as polyethylene glycol, glycerin, glycerol, polypropylenglycol, butyleneglycol or sorbitol. An example of a preferred plasticizer is a polyethylene glycol Carbowax® from Union Carbide.

Suitable for use in the present invention antioxidants include conventional antioxidants and preferably represent spatial employed phenols, such as 3,5-trimethyl-2,4,6-Tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene - Ethanox 330™that is commercially available from Ethyl Corporation.

The hotmelt adhesives of us who Otsego invention can be formed by mixing blockcopolymer, improves the adhesion of the absorbent resin and the aqueous liquid polymer in a suitable for receiving glue process equipment, for example in the mixer melt or extruders, at a temperature above their respective melting temperatures as long as they are uniformly mixed. Adhesive hot melt may be applied to the substrate using conventional adhesive equipment, such as slotted head for applying a coating of glue hot melt applicator with a centrifugal nozzle for applying hot melt glue (a commercial example of which is the Nordson Control Fiberization®), microfiber applicator for applying hot melt glue (commercial examples of such applicators include Nordson Control Coat®, ITW Dynafiber®, J&M Meltblown and May Coating's Accufiber®), an applicator with a rotating drum sieve to create a coating with a pattern (examples of such equipment include equipment Nordson and Kraemer, technology used in a rotating drum sieve).

Figure 1 shows an absorbent article, which for illustration purposes is a sanitary napkin 1, having opposite longitudinal sides 2, 3 and opposite transverse ends 4, 5. Figure 2 shows the cross-section of sanitary napkins 1 1, having a top adjacent to the body layer 10, the lower, lay down the store to clothing protective layer 20 and the absorbent element 30, located between the upper layer 10 and the protective layer 20. Absorbent adhesive hot melt 40 sticks of the upper layer 10 to the absorbent element 30 in the saturation zone 50 is essentially rectangular shape having a floor with a picture. Adhesive hot melt may be alternative is located between the absorbent element 30 and the protective layer 20 (not shown). Other samples of the adhesive drawings and the parts of the adhesive are shown in Fig.3-12.

For example, figure 3 shows a top view of an absorbent product 301 having a top layer 310, opposite longitudinal sides 302, 303 in the shape of an hourglass and opposite transverse ends 304, 305. Absorbent adhesive hot melt 340 is coated with a saturated zone 350 is essentially rectangular in shape.

In a variant of the invention, is illustrated in figure 4 and 5 shows a sanitary napkin 401 having the top layer 401, a protective layer 410, an absorbent element 430, the transition layer 470 and absorbing an aqueous liquid glue hot melt 440, which is formed by mixing the glue with the inert gas. Then foamed adhesive dispense and distribute through the exhaust hole on the substrate, in this case representing the top layer of sanitary napkins. This technology is commercially available from Nordson company Corporation, it is used processors Foam Met this company, more fully the technology disclosed in U.S. patent No. 5807367 Dilnik et al., which is fully incorporated into this description by reference. As shown in figure 4, the foamed hot melt glue 440 is applied adjacent to the body of the upper layer adjacent to the longitudinal sides of the sanitary napkin 401 with the formation of the side seals 450, 451 and end seals 460, 461. Adhesive hot melt 440 can be an alternative for applied between the upper layer 410 and the underlying absorbent element 430 (not shown).

Figure 6 and 7 shows the absorbent article, which for illustration purposes is a sanitary napkin 601 having opposite longitudinal sides 602, 603 and opposite longitudinal edges 604, 605. 7 shows a cross-section of a sanitary napkin 601 6 having a top adjacent to the body layer 610, lower, adjacent to the wear protective layer 620 and an absorbent element 630, located between the upper layer 610 and a protective layer 620. Absorbent adhesive hot melt 640 sticks protective layer 620 to the absorbent element 630 in the saturation zone 650 essentially rectangular shape having a floor with a multi-line pattern.

Fig shows a top view of an absorbent product, 801, with the top layer 810, opposite longitudinal sides 802, 803 hourglass-shaped and opposite transverse end the 804, 805. Absorbent adhesive hot melt 840 is applied in the form of a curvilinear pattern with the formation of the opposite lateral zones absorption 841, 842 and opposite lateral zones absorption 843, 844.

Figures 9 and 10 show respectively a top view of an absorbent products 901, 920, with adhesive figure essentially in the shape of an hourglass. Fig.9 is the top layer 910, opposite longitudinal sides 902, 903 hourglass-shaped and opposite transverse ends 904, 905. As follows from figures 9 and 10, the absorbent adhesive hot melt 940, 960 is applied to the product with the formation of (respectively) zones absorption 950, 965, having the shape of an hourglass.

Figure 11 and 12 shows an absorbent article, which, for purposes of illustration, is a sanitary napkin 1101 having opposite longitudinal side 1102, 1103 and opposite transverse ends 1104, 1105. On Fig sanitary napkin 1101 11 shows in cross-section, and it has an upper, adjacent to the body layer 1110, lower, adjacent to the wear protective layer 1120 and the absorbing element 1130, located between the upper layer 1110 and a protective layer 1120. Absorbent adhesive hot melt 1140 coupled to the upper layer 1110 and the absorbing element 1130 in the saturation zone 1150 having a coating in the form of parallel lines.

Example 1.

Absorbing vodouisant glue hot melt of the present invention was tested for its melt viscosity, adhesive strength (the strength of raster, which was measured with the use of polypropylene non-woven fabric) and the ability to absorb saline (physiological) solution (absorbing capacity) and compared with conventional hot melt glue, which passed similar tests. Conventional hot melt glue was commercially available from Fuller Company under the trade name HL-1491™. It is a standard hot melt glue, which is often used in the manufacture of absorbent products such as sanitary napkins, pads for panties, diapers and similar products. The composition of conventional adhesive contains ingredients in the following approximate proportions:

15-20% of blockcopolymer styrene-isoprene-styrene copolymer having a styrene content of 30%;

60-70% of the modified aliphatic or aromatic compound aliphatic resin, increase stickiness;

15-20% of mineral oil;

<2% of an antioxidant;

<2% additional auxiliary additives (wax and polyethylene).

Two examples of hot melt glue of the present invention have the following structures:

Sample A.

5.7% blockcopolymer (Vector DPX-552™).

33,7% increase adhesiveness of the resin (Foral 85™).

10,0% water absorbent liquid polymer (Aquacaulk TQU-5™).

40,0% superficialy particles (Peg 600™).

0.5% antioxidant (Ethanox 330ࡊ ).

A sample of the Century

15.0% blockcopolymer (Vector DPX-552™).

25,0% increase adhesiveness of the resin (Foral 85™).

0,0% water absorbent liquid polymer (Aquacaulk TQU-5™).

45,0% superficialy particles (Aquakeep J55-P™).

15.0% plasticizer (Peg 600™and

0.5% antioxidant (Ethanox 330™).

The test results presented in the following table 1

Table 1
 Commercial sampleA sample AndSample
Viscosity at 177°101000 (sandypaws)110010000 
Absorption capacity (g/g)no9,410,3
The strength of raster lbs/inch width (kg/cm width)1,1 (0,1964)0,3 (0,0535)1,18 (0,2107)

Commercially available hot melt glue essentially showed no absorption capacity, while the adhesive is hot melt of the present invention have absorbed about 10 grams of liquid per g of glue. In addition, when applying the adhesive composition of the present invention to practice was not observed to reduce its adhesive strength.

1. Adhesive hot melt, able to absorb aqueous fluid containing from about 10 to okolo% blockcopolymer, represents a linear or radial copolymer structure having the formula (a-b)xwhere block a is polivinilovym block, the block b is a poly(monoalkylated) block, x represents the number of polymer units and is an integer equal to or greater than one; from about 20 to about 80% increases the adhesiveness of the resin and from about 1 to about 60% water absorbent liquid polymer.

2. The adhesive according to claim 1, characterized in that polyvinylidene unit And are selected from the group consisting of polystyrene, poly(alpha-methylstyrene), polyvinyltoluene and combinations thereof, and where poly(monoalkanolamines) blocks block selected from the group consisting of elastomers dienes with conjugated double bonds, hydrogenated elastomers and combinations thereof.

3. The adhesive according to claim 2, characterized in that the elastomeric conjugated dienes are selected from the group consisting of polybutadiene and polyisoprene, and where hydrogenated elastomers are selected from the group consisting of ethylenebutylene, ethylene-propylene, polyisobutylene, and combinations thereof.

4. The adhesive according to claim 1, characterized in that it further comprises an absorbent thermoplastic polymers, superficiale particles, substances for improving adhesiveness and plasticizers.

5. The adhesive according to claim 1, characterized in that increases the stickiness of resin selected from the group consisting of natural resins, modifica avannah resins, glycerol esters, natural resins, glycerol esters of modified resins, pentaerythritol esters, natural resins, pentaerythritol esters of modified resins; polyterpene resins, copolymers of natural terpenes, terpolymers natural terpene-modified phenolic compounds, terpene resins and their hydrogenated derivatives, aliphatic petroleum resins and their hydrogenated derivatives, aromatic petroleum resins and their hydrogenated derivatives, aliphatic petroleum resins, hydrogenated derivatives of aliphatic petroleum resins, aromatic petroleum resins, hydrogenated derivatives of aromatic petroleum resins and their combinations.

6. The adhesive according to claim 1, wherein the water absorbent liquid polymers are selected from the group consisting of thermoplastic hydrogels and thermoplastic polymer compositions that are formed from water-soluble soft segment and one or more hard segments.

7. The adhesive according to claim 6, characterized in that the hard segments selected from the group consisting of polyurethane, polyamides, polyesters, politician, polypropyleneoxide and their combinations.

8. The adhesive according to claim 6, wherein the soft segments selected from the group consisting of polyethylene oxide, polyvinyl alcohol, polyvinylpyrrolidone, p is leukaemia, polysaccharide, polymolecular anhydride and random copolymers of polyethylene oxide and polypropyleneoxide.

9. Absorbent article comprising vlagopronitsaemym the top layer, moisture-proof protective layer, an absorbent element between the upper layer and a protective layer, characterized in that either the upper layer or the protective layer attached to the absorbent element using hot melt glue according to any one of claims 1 to 8.

10. Absorbent product according to claim 9, wherein the product is selected from the group consisting of sanitary napkins, pads for pants, wipes for adult patients suffering from incontinence and diapers.

11. Absorbent article comprising vlagopronitsaemym the top layer, moisture-proof protective layer, an absorbent element between the upper layer and a protective layer, characterized in that at least part of the absorbent element contains glue hot melt of the following composition: from about 10 to about 50% of blockcopolymer representing a linear or radial copolymer structure having the formula (a-b)xwhere block a is polivinilovym block, the block b is a poly(monoalkylated) block, x represents the number of polymer units and is an integer equal to or greater than one; from about 20 to about 80% increases the adhesiveness of the resin and from about 1 to approximately the 60% of the water absorbent liquid polymer.

12. Absorbent product according to claim 11, wherein the product is selected from the group consisting of sanitary napkins, pads for pants, wipes for adult patients suffering from incontinence and diapers.

13. Absorbent product according to item 12, characterized in that polyvinylidene unit And are selected from the group consisting of polystyrene, poly(alpha-methylstyrene), polyvinyltoluene and combinations thereof, and where poly(monoalkanolamines) blocks block selected from the group consisting of elastomers dienes with conjugated double bonds, hydrogenated elastomers and combinations thereof.

14. Absorbent product according to item 13, wherein the elastomeric conjugated dienes are selected from the group consisting of polybutadiene and polyisoprene, and where hydrogenated elastomers are selected from the group consisting of ethylenebutylene, ethylene propylene, polyisobutylene, and combinations thereof.

15. Absorbent product of claim 10, wherein the adhesive is a hot melt further comprises absorbent thermoplastic polymers, superficiale particles, substances for improving adhesiveness and plasticizers.

16. Absorbent product of claim 10, wherein increasing the adhesiveness of a resin selected from the group consisting of natural resins, modified resins, glycerol esters, natural resins, glycerol esters of modified is the R resins, pentaerythritol esters, natural resins, pentaerythritol esters of modified resins, polyterpene resins, copolymers of natural terpenes, terpolymers natural terpenes, phenol-modified terpene resins and their hydrogenated derivatives, aliphatic necessal and their hydrogenated derivatives, aromatic necesmry and its hydrogenated derivatives, aliphatic necessal, hydrogenated derivatives of the aliphatic necessal, aromatic necessal, hydrogenated derivatives of aromatic necessal and their combinations.

17. Absorbent product of claim 10, wherein the water absorbent liquid polymers are selected from the group consisting of thermoplastic hydrogels and thermoplastic polymer compositions that are formed from water-soluble soft segment and one or more hard segments.

18. Absorbent product according to 17, wherein the hard segments selected from the group consisting of polyurethane, polyamides, polyesters, politician, polypropyleneoxide and their combinations.

19. Absorbent product according to 17, wherein the soft segments selected from the group consisting of polyethylene oxide, polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, polysaccharide, polymolecular anhydride and statistical copolymers is of poliatilenaksida and polypropyleneoxide.



 

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FIELD: medicine, in particular, medicinal materials used for disinfecting treatment of hands, surfaces, injection area or skin portion in the area adjoining to donor's elbow flexure part.

SUBSTANCE: disinfecting diaper is manufactured from absorbing material impregnated with liquid disinfecting composition and has sizes of (135-145) mm x (165-175) mm. Diaper is made from material composed of viscose, polyester or mixture of viscose and polyester. Thickness of material from which diaper is manufactured is 23-25 g/m2 and its absorbing capacity is 9.5-10.0 g/g. Diaper is impregnated with the use of 4.0-5.0 ml of liquid disinfecting composition including alkyl dimethyl benzyl ammonium chloride, alkyl dimethyl(ethylbenzyl) ammonium chloride, glycerol, ethyl alcohol, and water, with components being used in predetermined ratio. According to another version, diaper sized (55-65) mm x (71-81) mm is made of material having thickness of 55-65 g/m2; its absorbing capacity is 10.5-11.5 g/g. Said diaper is impregnated with the use of 1.0-2.0 ml of liquid disinfecting composition.

EFFECT: reduced contamination of environment with treated material, reduced production costs, simplified manufacture process and increased efficiency.

7 cl, 6 ex

FIELD: medicine.

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14 cl, 2 ex

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18 cl, 1 tbl, 19 ex

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1 ex

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