# US 11,306,226 B2 · Hot melt adhesive composition and use thereof

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- Number: US 11,306,226 B2
- Document ID: US11306226B2
- Status: Granted
- Kind: B2
- Application number: 15/708,543
- Filed: 2017-09-19
- Published: 2018-01-04
- Granted: 2022-04-19
- Earliest claimed: 2015-03-20
- Assignees: Henkel AG & Co. KGaA
- Applicants: Henkel IP & Holding GmbH
- Inventors: Yuhong Hu; Darshak R. Desai; Jinyu Chen; Matthew L. Sharak
- Web page: https://patentgrep.com/patent/US11306226B2

## CPC

- C09J 123/14: Copolymers of propene (C09J123/16 takes precedence)
- A61L 15/58: Adhesives
- 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 27/08: of synthetic resin
- B32B 27/12: next to a fibrous or filamentary layer
- B32B 37/08: characterised by the cooling method
- B32B 37/1207: {Heat-activated adhesive (B32B37/04 takes precedence)}
- C09J 5/00: Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J 123/10: Homopolymers or copolymers of propene
- B32B 2037/1215: {Hot-melt adhesive}
- B32B 2307/54: Yield strength; Tensile strength
- B32B 2307/542: Shear strength
- B32B 2555/02: Diapers or napkins
- C09J 2423/10: Presence of homo or copolymers of propene
- 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)
- A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

The sprayable olefin-based hot melt adhesive and absorbent articles comprising the adhesive are disclosed. The sprayable olefin-based hot melt adhesive is particularly suitable for spraying at low application temperatures. The sprayable low application temperature hot melt adhesives have high green strength, excellent bond strength and aging performance. Moreover, the sprayable low application temperature hot melt adhesives allows for thin bond lines without bleed-through and burn-through risks for heat-sensitive substrates.

## Claims

### Claim 1

A hot melt adhesive comprising:
(a) 15 to about 25 wt % of a single polymer component, and not a blend of different (co)polymers produced by metallocene catalysis polymerization, consisting of a polypropylene-polyethylene (co) polymer having (i) a propylene content of about 81 to about 91 wt % of the (co)polymer (iii) a melt flow rate of 40 to about 150 g/10 min as measured at 230° C./2.16 kg ASTM D1238, (iv) a melting point of less than about 65° C. and (v) a heat of fusion value of less than about 20 J/g;
(b) 50 to about 60 wt % of a tackifier; and
(c) up to about 30 wt % of a wax and a plasticizer;
wherein the adhesive has (i) both initial and aged bond strength at 2.5 gsm add-on greater than 100 g/in, (ii) Green strength per static peel time greater than 300 seconds at 2.5 gsm add-on, (iii) a tan(o) value of greater than about 30 at 140° C., 10 rad/s, and (iv) a melt viscosity of about 2,000 to about 11,000 cps at 150° C., measured in accordance with ASTM 3236-88;
and
wherein the adhesive is sprayable at 140-155° C.

### Claim 2 (depends on 1)

The hot melt adhesive of claim 1, wherein the tackifier is selected from the group consisting of C5 resins, petroleum distillates, hydrogenated hydrocarbons, C5/C9 resins, C9 resins, polyterpenes, rosins, hydrogenated rosins, rosin esters and mixtures thereof.

### Claim 3 (depends on 1)

The hot melt adhesive of claim 1, wherein the wax is selected from the group consisting of paraffin, microcrystalline, polyethylene, polypropylene Fischer-Tropsch wax, oxidized Fischer-Tropsch, functionalized wax, and mixtures thereof.

### Claim 4 (depends on 1)

The hot melt adhesive of claim 1, wherein the plasticizer is selected from the group consisting of polybutenes, polyisobutylene, paraffinic oil, naphthenic oil, phthalates, benzoates, adipic esters, mineral oil, aliphatic oils, aromatic oil, long chain partial ether ester, alkyl monoesters, epoxidized oils, dialkyl diesters, aromatic diesters, alkyl ether monoester and mixtures thereof.

### Claim 5 (depends on 1)

An article comprising the adhesive of claim 1 interposed in between two substrates.

### Claim 6 (depends on 5)

The article of claim 5, where in the substrate is selected from the group consisting of nonwoven, polymer film, elastic film, and tissue.

### Claim 7 (depends on 5)

The article of claim 5, which is a diaper, training pant, absorbent underpant, sanitary napkin, medical gown, mead pad or disinfecting wipe.

### Claim 8 (depends on 1)

A method of forming a bonded article comprising the steps of:
1) spraying the hot melt adhesive compositions of claim 1 onto at least a portion of a first substrate at a temperature of about 155° C. or below at an add-on level of 0.1 to about 10 gsm;
2) applying a second substrate on the hot melt adhesive; and
3) cooling the hot melt adhesive composition to room temperature.