# US 12,110,424 B2 · Polypropylene-based adhesive and method for producing same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,110,424 B2
- Document ID: US12110424B2
- Status: Granted
- Kind: B2
- Application number: 17/264,619
- Filed: 2019-07-31
- Published: 2021-09-23
- Granted: 2024-10-08
- Earliest claimed: 2018-08-02
- Assignees: Idemitsu Kosan Co., Ltd.
- Applicants: Idemitsu Kosan Co.,Ltd.
- Inventors: Nozomu Fujii; Masami Kanamaru; Takuji Okamoto
- Web page: https://patentgrep.com/patent/US12110424B2

## CPC

- C08L 91/00: Compositions of oils, fats or waxes; Compositions of derivatives thereof
- C09J 123/12: Polypropene
- C08K 5/01: Hydrocarbons {(C08K5/0091 takes precedence)}
- C08K 5/14: Peroxides
- C09J 191/06: Waxes
- C08F 8/50: Partial depolymerisation
- C09J 2301/162: the carrier being a laminate constituted by plastic layers only
- C09J 2301/30: characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- Y02W 30/62: Plastics recycling; Rubber recycling
- Y10T 442/20: Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
- 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)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A polypropylene-based adhesive containing a polypropylene-based resin (A′) prepared by reducing the weight-average molecular weight of a polypropylene-based resin (A) by decomposition, in which the melting endotherm (ΔH-D) of the polypropylene-based resin (A) is 0 J/g or more and 80 J/g or less, as obtained from a melting endothermic curve drawn by holding a sample at −10° C. for 5 minutes in a nitrogen atmosphere followed by heating it at 10° C./min using a differential scanning calorimeter (DSC).

## Claims

### Claim 1

A polypropylene-based adhesive, comprising:
a polypropylene-based resin (A′) prepared by reducing a weight-average molecular weight of a polypropylene-based resin (A) by decomposition, in which a melting endotherm (ΔH-D) of the polypropylene-based resin (A) is 5 J/g or more and 80 J/g or less, as obtained from a melting endothermic curve drawn by holding a sample at −10° C. for 5 minutes in a nitrogen atmosphere followed by heating the sample at 10° C./min using a differential scanning calorimeter (DSC),
wherein
the polypropylene-based resin (A′) has a vinylidene group as a terminal unsaturated group contained per molecule of the polypropylene-based resin (A′) of 0.9 or more and 2.0 or less,
the polypropylene-based resin (A) has a melting point (Tm-D) of 20° C. or higher and 120° C. or lower, and
the polypropylene-based adhesive comprises a radical generator (B) in an amount of 0.01 parts by mass or more and 5 parts by mass or less relative to 100 parts by mass of the polypropylene-based resin (A).

### Claim 2 (depends on 1)

The polypropylene-based adhesive according to claim 1, wherein the weight-average molecular weight (Mw) of the polypropylene-based resin (A) is 150,000 or less.

### Claim 3 (depends on 1)

The polypropylene-based adhesive according to claim 1, wherein the polypropylene-based resin (A) has a viscosity of 400,000 mPa·s or less, as measured with a B viscosity viscometer.

### Claim 4 (depends on 1)

The polypropylene-based adhesive according to claim 1, wherein the polypropylene-based resin (A) has a molecular weight distribution (Mw/Mn) of 4.0 or less.

### Claim 5 (depends on 1)

The polypropylene-based adhesive according to claim 1, wherein the polypropylene-based resin (A) is a propylene homopolymer.

### Claim 6 (depends on 1)

The polypropylene-based adhesive according to claim 1, further comprising:
a tackifier resin (C) in an amount of 0 part by mass or more and 400 parts by mass or less relative to 100 parts by mass of the polypropylene-based resin (A).

### Claim 7 (depends on 1)

The polypropylene-based adhesive according to claim 1, further comprising:
an oil (D) in an amount of 0 part by mass or more and 100 parts by mass or less relative to 100 parts by mass of the polypropylene-based resin (A).

### Claim 8 (depends on 1)

The polypropylene-based adhesive according to claim 1, further comprising:
a wax (E) in an amount of 0 part by mass or more and 50 parts by mass or less relative to 100 parts by mass of the polypropylene-based resin (A).

### Claim 9 (depends on 1)

A laminate, comprising:
the polypropylene-based adhesive of claim 1.

### Claim 10 (depends on 1)

A nonwoven fabric, comprising:
the polypropylene-based adhesive of claim 1.

### Claim 11

A method for producing a polypropylene-based adhesive, the method comprising: reducing a weight-average molecular weight of a polypropylene-based resin (A); and
decomposing the polypropylene-based resin (A) in the presence of a radical generator (B), thereby producing a polypropylene-based resin (A′),
wherein
a melting endotherm (ΔHm-D) of the polypropylene-based resin (A) is 5 Jig or more and 80 J/g or less, as obtained from a melting endothermic curve drawn by holding a sample at −10° C. for 5 minutes in a nitrogen atmosphere followed by heating the sample at 10° C./min using a differential scanning calorimeter (DSC),
the polypropylene-based resin (A) has a melting point (Tm-D) of 20° C. or higher and 120° C. or lower,
the polypropylene-based adhesive comprises a radical generator (B) in an amount of 0.01 parts by mass or more and 5 parts by mass or less relative to 100 parts by mass of the polypropylene-based resin (A), and
the polpropylene-based resin (A′) has a vinylidene group as a terminal unsaturated group contained per molecule of the polypropylene-based resin (A′) of 0.9 or more and 2.0 or less.

### Claim 12 (depends on 11)

The method according to claim 11,
wherein the reducing is carried out by at least one method selected from the group consisting of adding a radical generator (B), heating and irradiating with radiation.