# US 2018/0002582 A1 · Adhesive and adhesive tape

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- Number: US 2018/0002582 A1
- Document ID: US20180002582A1
- Status: Published application
- Kind: A1
- Application number: 15/708,148
- Filed: 2017-09-19
- Published: 2018-01-04
- Earliest claimed: 2015-03-20
- Assignees: Toyo Ink Sc Holdings Co., Ltd.; Toyochem Co., Ltd.
- Applicants: Toyo Ink Sc Holdings Co., Ltd.; Toyochem Co., Ltd.
- Inventors: Shingo TANABE; Katsunori FUKUTA; Chiyo ISHIZU; Shuhei SAITO
- Web page: https://patentgrep.com/patent/US20180002582A1

## CPC

- C09J 175/08: from polyethers
- C08G 18/12: using two or more compounds having active hydrogen in the first polymerisation step
- C08G 18/4018: {Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48}
- C08G 18/4238: {derived from dicarboxylic acids and dialcohols}
- C08G 18/4277: {Caprolactone and/or substituted caprolactone}
- C08G 18/44: Polycarbonates
- C08G 18/4825: {Polyethers containing two hydroxy groups (C08G18/4833 - C08G18/5096 take precedence)}
- C08G 18/4829: {Polyethers containing at least three hydroxy groups (C08G18/4833 - C08G18/5096 take precedence)}
- C08G 18/73: acyclic
- C08G 18/7642: {containing at least two isocyanate or isothiocyanate groups linked to the aromatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate groups, e.g. xylylene diisocyanate or homologues substituted on the aromatic ring}
- C09J 7/20: characterised by their carriers
- C09J 7/30: characterised by the adhesive composition
- C09J 2475/00: Presence of polyurethane
- 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)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

An adhesive includes: a urethane prepolymer (A) obtained by reacting a polyol (a) with a polyisocyanate (b) under such conditions that the molar ratio of NCO/OH is 0.5-0.9 and having a molecular-weight dispersion degree [(weight-average molecular weight (Mw))/(number-average molecular weight (Mn)); hereinafter referred to also as Mw/Mn] of 4-12; a polyfunctional polyol (B), and an isocyanate curing agent (C).

## Claims

### Claim 1

An adhesive, comprising:
a urethane prepolymer (A) which is a polymer having a molecular-weight dispersion degree of 4 to 12 obtained by reacting a hydroxyl group of a polyol (a) with an isocyanate group of a polyisocyanate (b) where a molar ratio of NCO/OH is 0.5 to 0.9;
a polyfunctional polyol (B); and
an isocyanate curing agent (C).

### Claim 2 (depends on 1)

The adhesive according to claim 1, further comprising a fatty acid ester (D).

### Claim 3 (depends on 1)

The adhesive according to claim 1, wherein the polyol (a) is one or more selected from the group consisting of a polyether polyol, a polyester polyol, a polycarbonate polyol and a polycaprolactone polyol.

### Claim 4 (depends on 1)

The adhesive according to claim 1, wherein the polyisocyanate (b) is an aliphatic polyisocyanate.

### Claim 5 (depends on 1)

The adhesive according to claim 1, wherein the polyol (a) comprises two or more polyols.

### Claim 6 (depends on 1)

The adhesive according to claim 1, wherein the polyfunctional polyol (B) has a number average molecular weight of 1,000 to 5,000.

### Claim 7 (depends on 1)

The adhesive according to claim 1, wherein the polyfunctional polyol (B) has three or more hydroxyl groups.

### Claim 8 (depends on 2)

The adhesive according to claim 2, wherein the fatty acid ester (D) has a molecular weight of 200 or more.

### Claim 9 (depends on 1)

The adhesive according to claim 1, further comprising one or more of a curing accelerator and a curing retarder.

### Claim 10 (depends on 1)

The adhesive according to claim 1, further comprising an antioxidant.

### Claim 11 (depends on 1)

The adhesive according to claim 1, wherein, in an elution curve of a weight average molecular weight obtained by measuring the adhesive by gel permeation chromatography (GPC), a high molecular weight side and a low molecular weight side partitioned by a weight average molecular weight of 10,000 as a boundary each have one peak.

### Claim 12 (depends on 1)

The adhesive according to claim 1, wherein, in an elution curve of a weight average molecular weight obtained by measuring the adhesive by gel permeation chromatography (GPC), proportions of a high molecular weight component and a low molecular weight component in an entire molecular weight distribution are such that an area of the high molecular weight component is 70 to 98%, and an area of the low molecular weight component is 2 to 30% with a weight average molecular weight of 10,000 as a boundary.

### Claim 13 (depends on 1)

An adhesive tape, comprising:
a base material; and
an adhesive layer formed of the adhesive according to claim 1.