Hot melt adhesive

Patent metadata

Field	Value
Publication number	US-9758704-B2
Application number	US-201514632688-A
Country	US
Kind code	B2
Filing date	Feb 26, 2015
Priority date	Aug 28, 2012
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

A hot melt adhesive useful in high-speed coating and spiral coating at low temperature for adhering a polyolefin film to a nonwoven fabric and disposable products obtained by the same are provided. The hot melt adhesive comprises: (A) a thermoplastic block copolymer which is a copolymer of a vinyl-based aromatic hydrocarbon with a conjugated diene compound; (B) a propylene homopolymer having a melting point of 100° C. or lower which is obtainable by polymerizing propylene using a metallocene catalyst; and (C) an ethylene/α-olefin copolymer. The hot melt adhesive is excellent in high-speed coating and spiral coating at low temperature, and also provides excellent adhesion to a polyolefin film and a nonwoven fabric.

First claim

The invention claimed is:

1. A hot melt adhesive comprising:
(A) 1-9 parts by weight of a thermoplastic block copolymer which is a copolymer of a vinyl-based aromatic hydrocarbon with a conjugated diene compound;
(B) 27-35 parts by weight of a propylene homopolymer having a melting point of 100° C. or lower which is obtained by polymerizing propylene using a metallocene catalyst; and
(C) 1.5-5 parts by weight of an ethylene/α-olefin copolymer obtained by polymerizing with a metallocene catalyst;
wherein the total weight of the components is 100 parts.

2. The hot melt adhesive according to claim 1 , wherein the thermoplastic block copolymer (A) contains at least one selected from:
(A1) a hydrogenated styrene-butadiene block copolymer (SEBS); and
(A2) a hydrogenated styrene-isoprene block copolymer (SEPS).

3. The hot melt adhesive according to claim 1 , wherein the ethylene/α-olefin copolymer (C) contains at least one selected from an ethylene/propylene copolymer and an ethylene/1-octene copolymer.

4. The hot melt adhesive according to claim 1 , further comprising:
at least one selected from (D) a tackifier resin and (E) a plasticizer, wherein the plasticizer (E) is (E1) a naphthene oil or (E2) a paraffin oil.

5. An article comprising the hot melt adhesive according claim 1 .

6. The article of claim 5 which is a disposable product.

Assignees

• Henkel Ag & Co Kgaa

Inventors

• Inoue Kentarou

Classifications

• C09J153/025

  modified · CPC title

• C09J123/12 Primary

  Polypropene · CPC title

• C09J123/0807

  Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms · CPC title

• C08L53/025

  modified · CPC title

• C08L53/02

  of vinyl-aromatic monomers and conjugated dienes · CPC title