# US 8,465,844 B2 · Elastic attachment adhesive containing radial block copolymer

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- Number: US 8,465,844 B2
- Document ID: US8465844B2
- Status: Granted
- Kind: B2
- Application number: 10/779,505
- Filed: 2004-02-13
- Published: 2005-08-18
- Granted: 2013-06-18
- Earliest claimed: 2004-02-13
- Assignees: Henkel AG & Co. KGaA
- Applicants: Qiwei He; Michael G. Harwell
- Inventors: Qiwei He; Michael G. Harwell
- Web page: https://patentgrep.com/patent/US8465844B2

## CPC

- C09J 153/02: Vinyl aromatic monomers and conjugated dienes
- C08L 53/02: of vinyl-aromatic monomers and conjugated dienes
- C08L 2666/24: Graft or block copolymers according to groups C08L51/00, C08L53/00 or C08L55/02; Derivatives thereof
- Y10T 428/2967: Synthetic resin or polymer
- Y10T 428/31855: Of addition polymer from unsaturated monomers
- Y10T 428/31938: Polymer of monoethylenically unsaturated hydrocarbon
- 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)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Hot melt adhesive compositions containing radial polystyrene-polyisoprene/polybutadiene block copolymer and use as elastic attachment adhesive in the manufacture of disposable absorbent elastic articles.

## Claims

### Claim 1

An elastic attachment hot melt adhesive comprising:
(1) 15 wt % to about 35 wt % of a radial block copolymer component comprising (PS-PI- PB) nX wherein PS is polystyrene, PI is polyisoprene and PB is polybutadiene, X is the residue of a multifunctional coupling agent used in the production of the radial block copolymer, and n is equal to or greater than 3 and represents the number of PS-PI-PB arms appended to X,
said radial block copolymer having a styrene content of from 25 wt % to about 50wt %,
said radial block copolymer has a di-block percentage of less than about 25%, based on the amount of the radial block copolymer, and
the number average molecular weight of each arm of said radial block copolymer is from about 30,000 to about 95,000;
(2) about 1 wt% to about 6 wt% of a linear triblock copolymer selected from the group consisting of styrene-isoprene-styrene, styrene-butadiene-styrene and styrene-isobutylene styrene; and
(3) about 30 wt% to about 70 wt % of a tackifying resin;
wherein the wt% is based on the weight of the adhesive composition.

### Claim 2 (depends on 1)

The adhesive of claim 1 wherein the radial block copolymer has a di-block percentage of less than about 20%.

### Claim 3 (depends on 1)

The adhesive of claim 1 wherein the n is between about 3 and about 6.

### Claim 4 (depends on 1)

The adhesives of claim 1 further comprising a wax, said wax being present in an amount of less than about 5 wt %.

### Claim 5 (depends on 1)

The adhesive of claim 1 further comprising a liquid plasticizer, said plasticizer being present in amounts of less than about 20 wt %.

### Claim 6 (depends on 1)

An article of manufacture comprising the hot melt adhesive of claim 1 and a substrate, wherein
said substrate comprises an elastomeric fiber.

### Claim 7 (depends on 6)

The article of claim 6 which is a disposable elastic article.

### Claim 8 (depends on 7)

The article of claim 7 which is a diaper.

### Claim 9 (depends on 1)

The elastic attachment hot melt adhesive of claim 1 wherein the tackifying resin consists of about 40 wt% to about 60 wt % of a midblock compatible tackifier and about 1 wt% to about 30 wt % of an endblock compatible tackifier.

### Claim 10 (depends on 9)

The elastic attachment hot melt adhesive of claim 9 wherein the midblock compatible tackifier is selected from aliphatic resin, cycloaliphatic resin or mixtures thereof.