# US 10,307,995 B2 · Polypropylene impact copolymer based hot melt adhesive

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- Number: US 10,307,995 B2
- Document ID: US10307995B2
- Status: Granted
- Kind: B2
- Application number: 13/987,356
- Filed: 2013-07-16
- Published: 2015-01-22
- Granted: 2019-06-04
- Earliest claimed: 2013-07-16
- Assignees: Bostik SA
- Applicants: Bostik, Inc.
- Inventors: Patrick John Czaplewski; Steven Daniel Gray
- Web page: https://patentgrep.com/patent/US10307995B2

## CPC

- B32B 25/08: of synthetic resin
- B32B 5/02: characterised by structural features of a {fibrous or filamentary} layer {(layer formed of metallic wires B32B15/02; layer formed of natural mineral fibres B32B19/02; layer formed of wood fibres B32B21/02)}
- B32B 5/022: {Non-woven fabric}
- B32B 5/26: another layer {next to it} also being fibrous or filamentary {(relative arrangement of fibres or filaments of different layers B32B5/12)}
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 25/10: next to a fibrous or filamentary layer
- B32B 27/12: next to a fibrous or filamentary layer
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- C08K 5/0016: {Plasticisers}
- C08L 23/12: Polypropene
- C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers
- C09J 123/12: Polypropene
- C09J 123/16: {Elastomeric} ethylene-propylene or ethylene-propylene-diene copolymers {, e.g. EPR and EPDM rubbers}
- B32B 2307/51: Elastic
- B32B 2439/00: Containers; Receptacles
- B32B 2519/00: Labels, badges
- B32B 2554/00: Paper of special types, e.g. banknotes
- B32B 2555/00: Personal care
- B32B 2555/02: Diapers or napkins
- C08L 2205/03: containing three or more polymers in a blend
- C08L 2207/02: Heterophasic composition
- Y10T 442/601: Nonwoven fabric has an elastic quality
- Y10T 442/659: Including an additional nonwoven fabric
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A hot melt adhesive using polypropylene impact copolymers that is particularly well suited for elastic attachment and stretch films in diaper structures. The hot melt adhesive composition is a blend of about 2.5% to about 30%, by weight, of a polypropylene impact copolymer; about 2.5% to about 30%, by weight, of an olefin based elastomer; about 10% to about 70%, by weight, of a tackifying resin having a softening point of at least about 80° C. and up to about 140° C.; about 0% to about 60%, by weight, of a plasticizer; and about 0.1% to about 5% of a stabilizer or antioxidant.

## Claims

### Claim 1

A hot melt adhesive composition, comprising a blend of the following components:
about 2.5% to about 20% by weight, of a nonfunctionalized polypropylene impact copolymer;
about 2.5% to about 20% by weight, of an olefin based elastomer;
about 25% to about 65% by weight, of a tackifying resin having a softening point of at least about 80° C. and up to about 140° C.;
about 20% to 25.5% by weight, of a plasticizer, wherein said plasticizer is mineral oil;
about 0.1% to about 5% of a stabilizer antioxidant; and
wherein the components total 100% by weight of the composition, and the viscosity of the composition is equal to or less than about 20,000 mPas at 163° C.

### Claim 2 (depends on 1)

The composition of claim 1 comprising about 5% to about 20%, by weight, of the polypropylene impact copolymer.

### Claim 3 (depends on 1)

The composition of claim 1 comprising about 7.5% to about 15%, by weight, of the polypropylene impact copolymer.

### Claim 4 (depends on 1)

The composition of claim 1 comprising about 5% to about 20%, by weight, of the olefin based elastomer.

### Claim 5 (depends on 1)

The composition of claim 1 comprising about 7.5% to about 15%, by weight, of the olefin based elastomer.

### Claim 6 (depends on 1)

The composition of claim 1 comprising about 30% to about 60%, by weight, of the tackifying resin.

### Claim 7 (depends on 1)

The composition of claim 1 wherein the tackifying resin has a softening point of from about 95° C. to about 140° C.

### Claim 8 (depends on 1)

The composition of claim 1 comprising about 1% to about 25%, by weight, of an additional auxiliary polymer selected from the group consisting of EVA, APAO, PE, PP, PB, SIS, SI, SBS, SB, SIBS, SEB, SEBS, SEP, SEPS, SBBS, SEEPS and blends thereof.

### Claim 9 (depends on 8)

The composition of claim 8 comprising about 1% to about 15% by weight, of said auxiliary polymer.

### Claim 10 (depends on 1)

The composition of claim 1 having a viscosity equal to or less than 15,000 mPas at 163° C.

### Claim 11 (depends on 1)

The composition of claim 1 having a viscosity equal to or less than 10,000 mPas at 163° C.

### Claim 12 (depends on 1)

The composition of claim 1 having a viscosity equal to or less than 5,000 mPas at 163° C.

### Claim 13 (depends on 1)

The composition of claim 1 wherein said propylene impact copolymer has a melt flow rate of between 10 and 250 grams/10 minutes.

### Claim 14 (depends on 1)

The composition of claim 1 wherein said propylene impact copolymer has a melt flow rate of between 20 and 2.00 grams/10 minutes.

### Claim 15 (depends on 1)

The composition of claim 1 wherein said polypropylene impact copolymer has a melt flow rate of between 50 and 150 grams/10 minutes.

### Claim 16 (depends on 1)

The composition of claim 1 wherein said olefin based elastomer is a metallocene polymerized propylene/ethylene copolymer.

### Claim 17 (depends on 16)

The composition of claim 16 wherein said metallocene polymerized propylene/ethylene copolymer has from about 5% to about 16% ethylene by weight.

### Claim 18 (depends on 16)

The composition of claim 16 wherein said metallocene polymerized propylene/ethylene copolymer has a melt index of from about 1 to about 25.

### Claim 19 (depends on 16)

The composition of claim 16 wherein said metallocene polymerized propylene/ethylene copolymer has a density of from about 0.858 grams/cubic centimeter to about 0.888 grams/cubic centimeter.

### Claim 20 (depends on 1)

An elastic laminate comprising a first layer of nonwoven material, a second layer of nonwoven material, and one or a plurality of elastomeric substrates disposed between said first and second nonwoven layers, bonded together with the adhesive composition of claim 1.

### Claim 21 (depends on 20)

The elastic laminate of claim 20 wherein the one or the plurality of elastomeric substrates are elastic strands.

### Claim 22 (depends on 1)

An elastic laminate comprising a first layer of nonwoven material, a second layer of film material, and one or a plurality of elastomeric substrates disposed between said first and second layers, bonded together with the adhesive composition of claim 1.

### Claim 23 (depends on 22)

The elastic laminate of claim 22 where the film comprises a polyethylene film, a polypropylene film, an ethylene-propylene copolymer film or a cloth-like coated film material.

### Claim 24 (depends on 22)

The elastic laminate of claim 22 wherein the one or a plurality of elastomeric substrates are elastic strands.

### Claim 25 (depends on 1)

A laminate comprising a first layer of nonwoven material bonded to a second layer of film material with the adhesive composition of claim 1.

### Claim 26 (depends on 25)

The laminate of claim 25 where the film material comprises a polyethylene film, a polypropylene film, an ethylene-propylene copolymer film or a cloth-like coated film material.

### Claim 27 (depends on 1)

An article comprising the adhesive composition of claim 1.

### Claim 28 (depends on 27)

The article of claim 27 comprising a disposable diaper, a sanitary napkin, a bed pad, a bandage, a surgical drape, a tape, a label, a plastic sheet, a nonwoven sheet, a paper sheet, a cardboard, a book, a filter, or a package.