# US 5,703,162 A · Branched copolymer pressure sensitive hot melt adhesive

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- Number: US 5,703,162 A
- Document ID: US5703162A
- Status: Granted
- Kind: A
- Application number: 08/520,041
- Filed: 1995-08-28
- Granted: 1997-12-30
- Earliest claimed: 1994-05-05
- Assignees: H. B. Fuller Licensing & Financing, Inc.
- Inventors: Carolyn M. Anderson
- Web page: https://patentgrep.com/patent/US5703162A

## CPC

- C09J 153/025: {modified}
- C08L 2666/02: Organic macromolecular compounds, natural resins, waxes or and bituminous materials
- 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)

## Abstract

An improved hot melt, pressure sensitive adhesive. The adhesive has a unique combination of excellent heat stability and higher tack. The adhesive is utilized in disposable articles such as diapers and sanitary napkins. The adhesive employs a saturated A-B-A block copolymer such as S-EB-S or S-EP-S with B or C side chains such as isoprene or ethylene-propylene.

## Claims

### Claim 1

A hot melt, pressure sensitive adhesive composition comprising:
(a) about 5 to about 30 percent by weight of a first block copolymer comprising a substantially saturated A-B-A block copolymer having B or C side chains wherein A is polystyrene, B is selected from the group consisting of ethylene-propylene, ethylene-butylene and mixtures thereof, and C is selected from the group consisting of isoprene, butadiene, and mixtures thereof;
(b) about 3 to about 10 percent by weight of a second block copolymer selected from the group consisting of styrene-ethylene-butylene-styrene block copolymer, styrene-ethylene-propylene-styrene block copolymer and mixtures thereof;
(c) about 10 to 50 percent by weight of a plasticizer; and
(d) 0 to 65 percent by weight of a solid tackifying agent.

### Claim 2 (depends on 1)

The adhesive composition of claim 1 having heat stability wherein the viscosity of said composition changes less than 10% over a 96 hour period at 325.degree. F.

### Claim 3

A disposable article selected from the group consisting of disposable diapers, sanitary napkins, bed pads, incontinent pads, surgical drapes, wherein said article comprises an adhesive composition comprising:
(a) about 5 to about 30 percent by weight of a first block copolymer comprising a substantially saturated A-B-A block copolymer having B or C side chains wherein A is polystyrene. B is selected from the group consisting of ethylene-propylene, ethylene-butylene and mixtures thereof, and C is selected from the group consisting of isoprene, butadiene, and mixtures thereof;
(b) about 3 to about 10 percent by weight of a second block copolymer selected from the group consisting of styrene-ethylene-butylene-styrene block copolymer, styrene-ethylene-propylene-styrene block copolymer and mixtures thereof;
(c) about 10 to 50 percent by weight of a plasticizer; and
(d) 0 to about 85 percent by weight of a solid tackifying agent.

### Claim 4 (depends on 1)

The hot melt adhesive of claim 1 wherein the adhesive is useful for attaching a sanitary napkin to fabric.

### Claim 5 (depends on 1)

The hot melt adhesive of claim 1 wherein the adhesive is useful for attaching a medical device to skin.

### Claim 6 (depends on 4)

The hot melt adhesive of claim 4 wherein the initial T-peel to cotton of a 50 g/m.sup.2 adhesive coating is greater than about 500 g/linear inch.