# US 2013/0158176 A1 · LOW APPLICATION TEMPEARATURE AMORPHOUS POLY-a-OLEFIN ADHESIVE

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- Number: US 2013/0158176 A1
- Document ID: US20130158176A1
- Status: Published application
- Kind: A1
- Application number: 13/771,439
- Filed: 2013-02-20
- Published: 2013-06-20
- Earliest claimed: 2010-08-26
- Assignees: Henkel Corporation
- Inventors: Yuhong Hu; Charles W. Paul; Darshak Desai; Salvador Alvarado
- Web page: https://patentgrep.com/patent/US20130158176A1

## CPC

- C09J 123/20: having four to nine carbon atoms
- B32B 37/1207: {Heat-activated adhesive (B32B37/04 takes precedence)}
- B32B 37/1284: {Application of adhesive}
- B32B 37/18: involving the assembly of discrete sheets or panels only
- C09J 5/06: involving heating of the applied adhesive
- C09J 123/0815: {Copolymers of ethene with aliphatic 1-olefins}
- C09J 123/10: Homopolymers or copolymers of propene
- C09J 123/14: Copolymers of propene (C09J123/16 takes precedence)
- C09J 123/18: Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
- B32B 2037/1215: {Hot-melt adhesive}
- B32B 2555/02: Diapers or napkins
- C09J 2301/304: the adhesive being heat-activatable, i.e. not tacky at temperatures inferior to 30°C
- C09J 2400/263: in the substrate
- 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)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

It has been discovered that amorphous polybutene copolymers that have a softening point of from about 70 to about 105° C. and viscosity of less than about 1,900 cP at 190° C. possesses desirable properties and may be used to make a low application temperature hot melt adhesive for disposable absorbent articles.

## Claims

### Claim 1

A hot melt adhesive comprising at least 45 wt %, based on the adhesive, of an amorphous polybutene copolymer which has a softening point of from about 70 to about 105° C. and viscosity of less than about 1,900 cP at 190° C., and wherein the hot melt adhesive has a viscosity of less than about 6,000 cP at 150° C.

### Claim 2 (depends on 1)

The hot melt adhesive of claim 1 wherein the amorphous polybutene copolymer has a tan(δ) value greater than 30 at 140° C.

### Claim 3 (depends on 1)

The hot melt adhesive of claim 1 wherein the amorphous polybutene copolymer further comprises propylene comonomer.

### Claim 4 (depends on 3)

The hot melt adhesive of claim 3 wherein the amorphous polybutene copolymer has a butene content greater than about 40%.

### Claim 5 (depends on 1)

The hot melt adhesive of claim 1 further comprising a tackifier which has a softening point greater than or equal to 80° C.

### Claim 6 (depends on 4)

The hot melt adhesive of claim 4 wherein the tackifier has a softening point greater than or equal to 100° C.

### Claim 7 (depends on 4)

The hot melt adhesive of claim 4 wherein the tackifier is selected from the group consisting of C5 resins, petroleum distillates, hydrogenated hydrocarbons, C5/C9, polyterpenes, rosin, hydrogenated rosin, and rosin esters and mixtures thereof.

### Claim 8 (depends on 1)

The hot melt adhesive of claim 1 further comprising a crystalline wax which has a melting point greater than 60° C.

### Claim 9 (depends on 8)

The hot melt adhesive of claim 8 wherein the crystalline wax is selected from the group consisting of Fischer-Tropsch wax, petroleum based wax, conventional wax, natural-based wax, functionalized wax, polyolefin copolymers and mixtures thereof.

### Claim 10 (depends on 1)

The hot melt adhesive of claim 1 which is essentially free of wax and/or plasticizer.

### Claim 11 (depends on 1)

The hot melt adhesive of claim 1 which comprises greater than 50% of the amorphous polybutene copolymer.

### Claim 12 (depends on 11)

The hot melt adhesive of claim 11 which comprises greater than 60% of the amorphous polybutene copolymer.

### Claim 13 (depends on 1)

The hot melt adhesive of claim 1 wherein the adhesive has a tensile peak value greater than 55 psi at 23° C. at a pulling rate of 12 in/min.

### Claim 14 (depends on 1)

An article comprising the adhesive of claim 1.

### Claim 15 (depends on 14)

The article of claim 14 which is a personal care, health, medical, household or industrial product.

### Claim 16 (depends on 15)

The article of claim 15 which is a diaper, training pants, feminine hygiene pad, meat pads and adult incontinence products.

### Claim 17 (depends on 1)

A method comprising applying the adhesive of claim 1 at 150° C. or below to a first substrate; applying a second substrate onto the adhesive, thereby forming a bond.

### Claim 18 (depends on 17)

The method of claim 17 wherein the substrate is a nonwoven film.

### Claim 19 (depends on 18)

The method of claim 18 wherein the adhesive is applied onto the substrate by melt spraying, swirl patterning, random spraying and/or slot coating with an add-on-range of about 0.1 to about 20 g/m2.

### Claim 20 (depends on 19)

The method of claim 19 wherein the adhesive is applied with an add-on-range of about 0.1 to about 10 g/m2.