Hot melt adhesive

Patent metadata

Field	Value
Publication number	US-10400142-B2
Application number	US-201515119833-A
Country	US
Kind code	B2
Filing date	Jan 22, 2015
Priority date	Feb 21, 2014
Publication date	Sep 3, 2019
Grant date	Sep 3, 2019

Abstract

One aspect of the present invention resides in a hot melt adhesive including a thermoplastic polymer and a tackifier, wherein the tackifier includes an acid-modified tackifier that is modified by at least one of maleic acid and maleic anhydride, and by at least one selected from the group consisting of acrylic acid, methacrylic acid, an acrylic acid ester, and a methacrylic acid ester.

First claim

The invention claimed is:

1. A hot melt adhesive comprising a thermoplastic polymer and a tackifier, wherein
the tackifier includes an acid-modified tackifier that is modified by at least one of maleic acid and maleic anhydride, and by butyl methacrylate,
the acid-modified tackifier is a random or block copolymer having repeating units represented by Formula 1 below

in Formula 1, R 1 and R 2 are independently a hydrogen atom or functional unit represented by Formula 2 below, a is 0 to 3, at least one among a plurality of R 1 and R 2 is the functional unit represented by Formula 2 below, the ratio of n in the total of n and m is from 0 or more to less than 1,

the functional unit represented by Formula 2 is a random or block copolymer having a repeating unit represented by Formula 2, R 3 in Formula 2 is butyl group, R 4 in Formula 2 is methyl group, and each of l and k is 1 or more.

2. The hot melt adhesive according to claim 1 , wherein the thermoplastic polymer is a copolymer of a conjugated diene compound and a vinyl aromatic hydrocarbon.

3. The hot melt adhesive according to claim 2 , wherein the copolymer is at least one selected from the group consisting of a styrene-butadiene block copolymer, a styrene-isoprene block copolymer, a hydrogenated styrene-butadiene block copolymer, and a hydrogenated styrene-isoprene block copolymer.

4. The hot melt adhesive according to claim 1 , wherein an amount of the acid-modified tackifier is 0.1 mass % to 100 mass % based on a total amount of the tackifier.

5. The hot melt adhesive according to claim 1 , wherein
an amount of the thermoplastic polymer is 10 mass % to 75 mass %; and
an amount of the tackifier is 20 mass % to 80 mass %.

6. The hot melt adhesive according to claim 1 , further comprising a softener.

7. The hot melt adhesive according to claim 6 , wherein an amount of the softener is 5 mass % to 40 mass %.

Assignees

• Moresco Corp

Inventors

• Ichikawa Hisashi
• Kurokawa Hiroshi
• Samitsu Maki
• Fukuda Katsuhito

Classifications

• C09J151/00

  Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds (based on ABS polymers C09J155/02); Adhesives based on derivatives of such polymers · CPC title

• C09J11/08 Primary

  Macromolecular additives · CPC title

• C09J153/02

  Vinyl aromatic monomers and conjugated dienes · CPC title