# US 10,501,663 B2 · Base polymer for hot melt adhesive

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- Number: US 10,501,663 B2
- Document ID: US10501663B2
- Status: Granted
- Kind: B2
- Application number: 15/537,142
- Filed: 2015-12-22
- Published: 2018-09-20
- Granted: 2019-12-10
- Earliest claimed: 2014-12-22
- Assignees: Idemitsu Kosan Co., Ltd.
- Applicants: Idemitsu Kosan Co., Ltd.
- Inventors: Kanako Samejima; Harumi Nakashima; Yutaka Minami; Tomoaki Takebe
- Web page: https://patentgrep.com/patent/US10501663B2

## CPC

- C08L 23/12: Polypropene
- C09J 123/14: Copolymers of propene (C09J123/16 takes precedence)
- A61F 13/15: Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F 13/472: specially adapted for female use
- C08L 23/10: Homopolymers or copolymers of propene
- C08L 23/14: Copolymers of propene (C08L23/16 takes precedence)
- C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers
- C09J 5/00: Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J 11/00: Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J 11/06: organic
- C09J 123/00: Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
- C09J 123/04: Homopolymers or copolymers of ethene
- C09J 123/06: Polyethylene
- C09J 123/0815: {Copolymers of ethene with aliphatic 1-olefins}
- C09J 123/10: Homopolymers or copolymers of propene
- C09J 123/12: Polypropene
- C09J 123/142: {at least partially crystalline copolymers of propene with other olefins}
- C09J 123/20: having four to nine carbon atoms
- C09J 2423/04: Presence of homo or copolymers of ethene
- C09J 2423/10: Presence of homo or copolymers of propene
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- 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)
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)

## Abstract

A base polymer for hot-melt adhesive, containing a propylenic polymer (A) having a tensile modulus of elasticity of 60 MPa or more, and an olefinic polymer (B) having a tensile modulus of elasticity of less than 60 MPa, wherein, relative to 100 parts by mass of the total amount of the propylenic polymer (A) and the olefinic polymer (B), the content of the propylenic polymer (A) is 1 part by mass or more and less than 50 parts by mass, and the content of the olefinic polymer (B) is more than 50 parts by mass and 99 parts by mass or less; and a hot-melt adhesive containing the base polymer, and further containing at least one of (C) a tackifier resin and (D) an oil.

## Claims

### Claim 1

A base polymer for hot-melt adhesive, comprising:
a propylenic polymer (A) having a tensile modulus of elasticity at 23° C. of 60MPa or more, and
an olefinic polymer (B) having a tensile modulus of elasticity at 23° C. of less than 60 MPa, wherein:
relative to 100 parts by mass of the total amount of the propylenic polymer (A) and the olefinic polymer (B), the content of the propylenic polymer (A) is 1 part by mass or more and less than 50 parts by mass, and the content of the olefinic polymer (B) is more than 50 parts by mass and 99 parts by mass or less, wherein weight-average molecular weight (Mw) of the propylenic polymer (A) is 10,000 to 52,000.

### Claim 2 (depends on 1)

The base polymer for hot-melt adhesive according to claim 1, wherein the content of the propylenic polymer (A) is 1 part by mass or more and 40 parts by mass or less, and the content of the olefinic polymer (B) is 60 parts by mass or more and 99 parts by mass or less.

### Claim 3 (depends on 1)

The base polymer for hot-melt adhesive according to claim 1, wherein the propylenic polymer (A) is a propylene homopolymer.

### Claim 4 (depends on 1)

The base polymer for hot-melt adhesive according to claim 1, wherein the tensile modulus of elasticity at 23° C. of the propylenic polymer (A) is 90 MPa or more.

### Claim 5 (depends on 1)

The base polymer for hot-melt adhesive according to claim 1, wherein the olefinic polymer (B) is a copolymer of at least two selected from the group consisting of propylene, ethylene and α-olefins each having 4 to 24 carbon atoms, a propylene homopolymer, or an ethylene homopolymer.

### Claim 6 (depends on 1)

The base polymer for hot-melt adhesive according to claim 1, wherein the olefinic polymer (B) is a copolymer of propylene, ethylene and 1-butene.

### Claim 7 (depends on 1)

The base polymer for hot-melt adhesive according to claim 1, wherein the propylenic polymer (A) has a melting point of 120° C. or lower.

### Claim 8 (depends on 1)

The base polymer for hot-melt adhesive according to claim 1, wherein the olefinic polymer (B) has a melting point of 50° C. or higher and 160° C. or lower.

### Claim 9 (depends on 1)

A hot-melt adhesive, comprising:
a base polymer for hot-melt adhesive according to claim 1; and
at least one selected from the group consisting of (C) a tackifier resin and (D) an oil.

### Claim 10 (depends on 9)

The hot-melt adhesive according to claim 9, which satisfies the following (1) and (2):
(1) the tensile modulus of elasticity at 23° C. of the base polymer is 400 MPa or less; and
(2) the semi-crystallization time at 25° C. of the hot-melt adhesive is 5 minutes or less.

### Claim 11 (depends on 9)

A method of bonding a substrate to another substrate, the method comprising
melting a hot-melt adhesive according to claim 9, and applying the melted hot-melt adhesive to at least one substrate; and
bonding another substrate to the applied hot-melt adhesive.

### Claim 12 (depends on 9)

A sanitary article, comprising a hot-melt adhesive according to claim 9.