# US 12,180,339 B2 · Flexible polyamide

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- Number: US 12,180,339 B2
- Document ID: US12180339B2
- Status: Granted
- Kind: B2
- Application number: 17/276,216
- Filed: 2019-10-23
- Published: 2022-02-03
- Granted: 2024-12-31
- Earliest claimed: 2018-10-25
- Assignees: Unitika Ltd.
- Applicants: Unitika Ltd.
- Inventors: Makoto Nakai; Yuki Takubo; Yusuke Yagi
- Web page: https://patentgrep.com/patent/US12180339B2

## CPC

- C08G 69/28: Preparatory processes
- C08G 69/26: derived from polyamines and polycarboxylic acids
- C08G 69/34: using polymerised unsaturated fatty acids
- C08L 77/06: Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence)
- C08G 69/265: {from at least two different diamines or at least two different dicarboxylic acids}
- C08G 69/40: Polyamides containing oxygen in the form of ether groups (C08G69/12, C08G69/32 take precedence)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

A flexible polyamide including a unit formed from an aliphatic dicarboxylic acid (A1) having 18 or more carbon atoms and/or a unit formed from an aliphatic diamine (B1) having 18 or more carbon atoms, wherein the polyamide has a total content of 10 to 90% by mass of the unit formed from (A1) and the unit formed from (B1) and has a melting point of 240° C. or higher.

## Claims

### Claim 1

A flexible polyamide comprising a unit formed from an aliphatic dicarboxylic acid (A1) having 18 or more carbon atoms, a unit formed from an aliphatic diamine (B1) having 18 or more carbon atoms, a unit formed from a dicarboxylic acid (A2) having 12 or less carbon atoms, and a unit formed from a diamine (B2) having 8 to 12 carbon atoms,
wherein the polyamide has a total content of 10 to 90% by mass of the unit formed from the aliphatic dicarboxylic acid (A1) having 18 or more carbon atoms and the unit formed from the aliphatic diamine (B1) having 18 or more carbon atoms, and
wherein the polyamide has a melting point of 300° C. or higher,
wherein the aliphatic diamine (B1) having 18 or more carbon atoms comprises dimer diamine, and
wherein the dicarboxylic acid (A2) having 12 or less carbon atoms comprises aromatic dicarboxylic acid.

### Claim 2 (depends on 1)

The flexible polyamide according to claim 1, wherein the polyamide has a tensile elongation at break of 30% or more.

### Claim 3 (depends on 1)

The flexible polyamide according to claim 1, wherein the aliphatic dicarboxylic acid (A1) having 18 or more carbon atoms is dimer acid.

### Claim 4 (depends on 1)

The flexible polyamide according to claim 1, wherein the dicarboxylic acid (A2) having 12 or less carbon atoms is terephthalic acid.

### Claim 5 (depends on 1)

The flexible polyamide according to claim 1, wherein the diamine (B2) having 8 to 12 carbon atoms is 1,10-decanediamine.

### Claim 6 (depends on 1)

The flexible polyamide according to claim 1, comprising no segments formed of polyether or polyester.

### Claim 7 (depends on 1)

A molded body constructed by molding the flexible polyamide according to claim 1.

### Claim 8 (depends on 1)

A method for manufacturing the flexible polyamide according to claim 1, wherein polymerization is conducted at a temperature equal to or lower than the melting point of the polyamide.