US 10,472,514 B2Granted

Block copolymer composition and adhesive composition

AssigneesAsahi Kasei Kabushiki Kaisha, Japan Elastomer Co., Ltd.

InventorsTakahiro Hisasue, Shigeo Nakajima, Yoshifumi Araki, Yukinori Nakamichi

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Abstract

A block copolymer composition including: 10% by mass or more and 90% by mass or less of a component (a), and 10% by mass or more and 90% by mass or less of a component (b), wherein the component (a) is a block copolymer containing a polymer block (A) primarily including a vinyl aromatic monomer unit and a polymer block (B) primarily including a conjugated diene monomer unit, wherein the block copolymer has a weight average molecular weight of 30,000 or higher and 150,000 or lower; and the component (b) is a block copolymer containing a polymer block (A) primarily including a vinyl aromatic monomer unit and a polymer block (B) primarily including a conjugated diene monomer unit.

Claims17

Dependent claims

A block copolymer composition comprising:

(i) 50% by mass or more and 90% by mass or less of a component (a) that is a block copolymer comprising a polymer block (A) mainly comprising a vinyl aromatic monomer unit and a polymer block (B) comprising more than 50% by mass of a conjugated diene monomer unit, wherein the block copolymer has a weight average molecular weight of 30,000 or higher and 150,000 or lower,
(ii) a component (b-2) that is a block copolymer comprising a polymer block (A) mainly comprising a vinyl aromatic monomer unit and a polymer block (B) comprising more than 50% by mass of a conjugated diene monomer unit, wherein at a ratio of a weight average molecular weight of the block copolymer to the weight average molecular weight of the component (a) is 2.5 or more and less than 3.4,
(iii) a component (b-3) that is a block copolymer comprising a polymer block (A) mainly comprising a vinyl aromatic monomer unit and a polymer block (B) mainly comprising a conjugated diene monomer unit, wherein a ratio of a weight average molecular weight of the block copolymer to the weight average molecular weight of the component (a) is 3.4 or more and less than 4.5, and
(iv) optionally a component (b-1) that is a block copolymer comprising a polymer block (A) mainly comprising a vinyl aromatic monomer unit and a polymer block (B) mainly comprising a conjugated diene monomer unit, wherein a ratio of a weight average molecular weight of the block copolymer to the weight average molecular weight of the component (a) is 1.5 or more and less than 2.5,
wherein a content of the vinyl aromatic monomer unit in the component (a) and the components (b-1), (b-2) and (b-3) is 12 to 35% by mass based on a total amount of the component (a) and the components (b-1), (b-2) and (b-3),
a hydrogenation ratio in the conjugated diene monomer unit in the component (a) and the components (b-1), (b-2) and (b-3) is 20% by mass or more, and
a content of the components (b-1), (b-2) and (b-3) is 10% by mass or more and 50% by mass or less.

4 more elements

An adhesive composition comprising:

(a) 100 parts by mass of the block copolymer composition comprising:
(i) 10% by mass or more and 90% by mass or less of a component (a) that is a block copolymer comprising a polymer block (A) mainly comprising a vinyl aromatic monomer unit and a polymer block (B) comprising more than 50% by mass of a conjugated diene monomer unit, wherein the block copolymer has a weight average molecular weight of 30,000 or higher and 150,000 or lower,
(ii) a component (b-2) that is a block copolymer comprising a polymer block (A) mainly comprising a vinyl aromatic monomer unit and a polymer block (B) comprising more than 50% by mass of a conjugated diene monomer unit, wherein a ratio of a weight average molecular weight of the block copolymer to the weight average molecular weight of the component (a) is 2.5 or more and less than 3.4,
(iii) a component (b-3) that is a block copolymer comprising a polymer block (A) mainly comprising a vinyl aromatic monomer unit and a polymer block (B) mainly comprising a conjugated diene monomer unit, wherein a ratio of a weight average molecular weight of the block copolymer to the weight average molecular weight of the component (a) is 3.4 or more and less than 4.5, and
(iv) optionally a component (b-1) that is a block copolymer comprising a polymer block (A) mainly comprising a vinyl aromatic monomer unit and a polymer block (B) mainly comprising a conjugated diene monomer unit, wherein a ratio of a weight average molecular weight of the block copolymer to the weight average molecular weight of the component (a) is 1.5 or more and less than 2.5,
wherein a content of the vinyl aromatic monomer unit in the component (a) and the components (b-1), (b-2) and (b-3) is 12 to 35% by mass based on a total amount of the component (a) and the components (b-1), (b-2) and (b-3), and
a hydrogenation ratio in the conjugated diene monomer unit in the component (a) and the components (b-1), (b-2) and (b-3) is 20% by mass or more;
(b) 50 to 400 parts by mass of a tackifier;
and
(c) 10 to 200 parts by mass of a softener.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/113,317Filed 22 Jan 2015
Priority: JP 2014-01081023 Jan 2014
Published: US 2017/0002190 A15 Jan 2017
Granted: 12 Nov 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

C08L 53/02
Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated…:…
C08F 297/044
Polymerising vinyl aromatic monomers and conjugated dienes: using a coupling agent
C08L 91/00
Compositions of oils, fats or waxes
C09J 7/387
Based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds: block-copolymers