# US 2018/0022920 A1 · Polyamide resin composition

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- Number: US 2018/0022920 A1
- Document ID: US20180022920A1
- Status: Published application
- Kind: A1
- Application number: 15/547,904
- Filed: 2016-03-02
- Published: 2018-01-25
- Earliest claimed: 2015-03-03
- Assignees: Unitika Ltd.
- Applicants: Unitika Ltd.
- Inventors: Miho Nakai; Shohei Kumazawa; Kenji Ikemoto
- Web page: https://patentgrep.com/patent/US20180022920A1

## CPC

- C08L 77/02: Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C08L77/10 takes precedence)
- C08K 7/02: Fibres or whiskers
- C08L 1/02: Cellulose; Modified cellulose
- C08K 2003/329: {Phosphorus containing acids}
- C08L 2205/16: Fibres; Fibrils
- C08L 2314/00: Polymer mixtures characterised by way of preparation
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Provided is a polyamide resin composition including 0.01 to 50 parts by mass of cellulose fiber in relation to 100 parts by mass of a polyamide resin, having a relative viscosity of 2.3 or more, and having an L-value, an a-value and a b-value in an Lab color space of 20 or more, 10 or less and 20 or less, respectively. The aforementioned polyamide resin composition is obtained by subjecting a polyamide resin composition having a relative viscosity of 2.2 or less to a solid phase polymerization.

## Claims

### Claim 1

A polyamide resin composition comprising 0.01 to 50 parts by mass of cellulose fiber in relation to 100 parts by mass of a polyamide resin which has a relative viscosity of 2.3 or more, and having an L-value, an a-value and a b-value in an Lab color space of 20 or more, 10 or less and 20 or less, respectively.

### Claim 2 (depends on 1)

The polyamide resin composition according to claim 1, further comprising phosphorous acid or sodium hypophosphite.

### Claim 3 (depends on 1)

The polyamide resin composition according to claim 1, wherein the polyamide resin is polyamide 6.

### Claim 4 (depends on 1)

The polyamide resin composition according to claim 1, wherein an average fiber diameter of the cellulose fiber is 500 nm or less.

### Claim 5 (depends on 1)

A method for producing a polyamide resin composition, wherein in a production of a polyamide resin composition according to claim 1, a polyamide resin composition whose polyamide resin having a relative viscosity of 2.2 or less is subjected to a solid phase polymerization.

### Claim 6 (depends on 2)

The polyamide resin composition according to claim 2, wherein the polyamide resin is polyamide 6.

### Claim 7 (depends on 2)

The polyamide resin composition according to claim 2, wherein an average fiber diameter of the cellulose fiber is 500 nm or less.

### Claim 8 (depends on 2)

A method for producing a polyamide resin composition, wherein in a production of a polyamide resin composition according to claim 2, a polyamide resin composition whose polyamide resin having a relative viscosity of 2.2 or less is subjected to a solid phase polymerization.

### Claim 9 (depends on 3)

A method for producing a polyamide resin composition, wherein in a production of a polyamide resin composition according to claim 3, a polyamide resin composition whose polyamide resin having a relative viscosity of 2.2 or less is subjected to a solid phase polymerization.

### Claim 10 (depends on 4)

A method for producing a polyamide resin composition, wherein in a production of a polyamide resin composition according to claim 4, a polyamide resin composition whose polyamide resin having a relative viscosity of 2.2 or less is subjected to a solid phase polymerization.