US 2015/0175855 A1Published application

Block copolymer composition for viscous adhesive, and adhesive composition

AssigneesAsahi Kasei Chemicals Corporation, Japan Elastomer Co., Ltd.

InventorsShigeo Nakajima, Takahiro Hisasue, Kenji Ebara, Yukinori Nakamichi

Life of this patent

Estimating the term…

Loading patent…

Abstract

It is an object to provide a block copolymer composition for a viscous adhesive, which will be a viscous adhesive composition excellent in balance of the adhesive properties such as tack strength and tackiness, having a low melt viscosity, and excellent solubility, coating properties, ejection stability, and surface skin quality. The block copolymer composition for a viscous adhesive having: a component (a) in an amount of 50 mass % or more and 90 mass % or less; and a component (b) in an amount of 10 mass % or more and 50 mass % or less; a content of the vinyl aromatic monomer unit being 25 to 50 mass %; a viscosity of the 15 mass % toluene solution being 10 to 40 mPa·s; and a number average molecular weight ratio of the component (b) to the component (a) being 2.0 to 4.0.

Claims8

Dependent claims

A block copolymer composition for a viscous adhesive comprising:

a component (a):
50 mass % or more and 90 mass % or less of a block copolymer having a number average molecular weight of 10,000 or more and 60,000 or less, comprising a polymer block (A) mainly including a vinyl aromatic monomer unit and a polymer block (B) mainly including a conjugated diene monomer unit;
and
a component (b):
10 mass % or more and 50 mass % or less of a block copolymer having a number average molecular weight of more than 120,000 and 200,000 or less, comprising a polymer block (A) mainly including a vinyl aromatic monomer unit and a polymer block (B) mainly including a conjugated diene monomer unit;
a content of the vinyl aromatic monomer unit being 25 to 50 mass %;
the composition having a 15 mass % toluene solution viscosity of 10 to 40 mPa·s;
and
a number average molecular weight ratio of the component (b) to the component (a) being 2.0 to 4.0.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/416,830Filed 18 Jul 2013
Priority: JP 2012-16519525 Jul 2012
Published: 25 Jun 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

C09J 153/02
Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon…: vinyl…
C08F 297/044
Polymerising vinyl aromatic monomers and conjugated dienes: using a coupling agent
C08L 53/02
Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated…:…
C08L 91/00
Compositions of oils, fats or waxes