# US 11,440,987 B2 · Tetra-block copolymer, and polymer composition, and hot-melt sticky adhesive composition using these

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- Number: US 11,440,987 B2
- Document ID: US11440987B2
- Status: Granted
- Kind: B2
- Application number: 16/971,683
- Filed: 2019-02-20
- Published: 2020-12-31
- Granted: 2022-09-13
- Earliest claimed: 2018-02-27
- Assignees: Zeon Corporation
- Applicants: Zeon Corporation
- Inventors: Leo Tsunoi; Ryoji Oda; Sadaharu Hashimoto
- Web page: https://patentgrep.com/patent/US11440987B2

## CPC

- C08F 297/04: polymerising vinyl aromatic monomers and conjugated dienes
- C09J 7/387: {Block-copolymers}
- C08L 53/02: of vinyl-aromatic monomers and conjugated dienes
- C09J 7/21: Paper; Textile fabrics
- C09J 7/35: Heat-activated
- C09J 153/02: Vinyl aromatic monomers and conjugated dienes
- C09J 2400/283: in the substrate
- C09J 2453/00: Presence of block copolymer
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- 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)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

A tetrablock copolymer having an aromatic vinyl block (A1), a conjugated diene block (B1), an aromatic vinyl block (A2), and a conjugated diene block (B2) is provided, wherein Mw(A2)/Mw(A1) is 1.2 to 5, Mw(A2) is 12,000 or more, Mw(B1)>Mw(B2), Mw(Total) is 50,000 to 400,000 where the weight average molecular weight of the aromatic vinyl block (A1) is defined as Mw(A1), the weight average molecular weight of the conjugated diene block (B1) is defined as Mw(B1), the weight average molecular weight of the aromatic vinyl block (A2) is defined as Mw(A2), the weight average molecular weight of the conjugated diene block (B2) is defined as Mw(B2), and the weight average molecular weight of the tetrablock copolymer as a whole is defined as Mw(Total), and the content of aromatic vinyl monomer units is 10 to 30% by weight.

## Claims

### Claim 1

A tetrablock copolymer having an aromatic vinyl block (A1), a conjugated diene block (B1), an aromatic vinyl block (A2), and a conjugated diene block (B2) in this order,
wherein Mw(A2)/Mw(A1) is 1.2 to 5, Mw(A2) is 13,000 or more, Mw(B1)>Mw(B2), and Mw(Total) is 50,000 to 400,000,
where the weight average molecular weight of the aromatic vinyl block (A1) is defined as Mw(A1), the weight average molecular weight of the conjugated diene block (B1) is defined as Mw(B1), the weight average molecular weight of the aromatic vinyl block (A2) is defined as Mw(A2), the weight average molecular weight of the conjugated diene block (B2) is defined as Mw(B2), and the weight average molecular weight of the tetrablock copolymer as a whole is defined as Mw(Total), and
the content of aromatic vinyl monomer units is 10 to 30% by weight.

### Claim 2 (depends on 1)

A polymer composition comprising 50% by weight or more of the tetrablock copolymer according to claim 1.

### Claim 3 (depends on 2)

The polymer composition according to claim 2, comprising 50% by weight or less of a triblock copolymer having an aromatic vinyl block (A1), a conjugated diene block (B1), and an aromatic vinyl block (A2) in this order.

### Claim 4 (depends on 1)

A hot-melt adhesive composition, comprising:
the tetrablock copolymer according to claim 1; and
a tackifying resin.

### Claim 5 (depends on 4)

The hot-melt adhesive composition according to claim 4,
wherein the content of the tackifying resin is 10 to 500 parts by weight relative to 100 parts by weight of the tetrablock copolymer.

### Claim 6 (depends on 4)

The hot-melt adhesive composition according to claim 4, further comprising 1 to 500 parts by weight of a softening agent relative to 100 parts by weight of the tetrablock copolymer.

### Claim 7 (depends on 4)

An adhesive tape comprising the hot-melt adhesive composition according to claim 4.

### Claim 8 (depends on 4)

A packaging tape for an adherent containing recycled paper, the packaging tape comprising the hot-melt adhesive composition according to claim 4.