# US 11,898,035 B2 · Polyamide composition, and molded article including same

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

- Number: US 11,898,035 B2
- Document ID: US11898035B2
- Status: Granted
- Kind: B2
- Application number: 17/269,663
- Filed: 2019-08-21
- Published: 2021-11-04
- Granted: 2024-02-13
- Earliest claimed: 2018-08-24
- Assignees: Kuraray Co., Ltd.
- Applicants: Kuraray Co., Ltd.
- Inventors: Shimon Kanai; Takaharu Shigematsu
- Web page: https://patentgrep.com/patent/US11898035B2

## CPC

- C08G 69/265: {from at least two different diamines or at least two different dicarboxylic acids}
- C08L 77/06: Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence)
- B29C 45/0001: {characterised by the choice of material}
- C08F 220/325: {containing glycidyl radical, e.g. glycidyl (meth)acrylate}
- C08F 222/06: Maleic anhydride
- C08K 5/0066: {Flame-proofing or flame-retarding additives}
- C08K 7/14: Glass
- C08L 25/08: Copolymers of styrene (C08L29/08, C08L35/06, C08L55/02 take precedence)
- C08L 25/18: Homopolymers or copolymers of aromatic monomers containing elements other than carbon and hydrogen
- B29C 2945/76498: Pressure
- B29C 2945/76531: Temperature
- B29K 2077/00: Use of {PA, i.e.} polyamides, e.g. polyesteramides {or derivatives thereof}, as moulding material
- C08L 2201/02: Flame or fire retardant/resistant
- C08L 2203/20: use in electrical or conductive gadgets
- C08L 2203/30: used for thermoforming
- 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)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS

## Abstract

Provided are a polyamide composition containing a polyamide (A) having a melting point of 280° C. or higher and a flame retardant (B), which is such that, when a melt of the polyamide composition is injection-molded with a mold having a thickness of 0.5 mm and a width of 40 mm under the condition of a cylinder temperature higher by 20° C. than the melting point of the polyamide (A), an injection pressure of 74 MPa and a mold temperature of 140° C., the flow length is 40 mm or more, and that the melt flow rate at a temperature of 320° C. and under a load of 2.16 kg is 15 g/10 min or less; and a molded article of the polyamide composition.

## Claims

### Claim 1

A polyamide composition comprising
a polyamide (A) having a melting point of 280° C. or higher and
a flame retardant (B),
which is such that, when a melt of the polyamide composition is injection-molded with a mold having a thickness of 0.5 mm and a width of 40 mm under the condition of a cylinder temperature higher by 20° C. than the melting point of the polyamide (A), an injection pressure of 74 MPa and a mold temperature of 140° C., the flow length is 40 mm or more, and
that the melt flow rate of the polyamide composition at a temperature of 320° C. and under a load of 2.16 kg is 15 g/10 min or less;
wherein the polyamide composition further comprises an aromatic vinyl copolymer (C),
wherein the aromatic vinyl copolymer (C) contains
a structural unit derived from an aromatic vinyl monomer, and
a structural unit derived from an α,β-unsaturated dicarboxylic anhydride; and
wherein the content of the α,β-unsaturated dicarboxylic anhydride-derived structural unit in the aromatic vinyl copolymer (C) is from 18 to 28% by mass.

### Claim 2 (depends on 1)

The polyamide composition according to claim 1, wherein the glass transition temperature of the aromatic vinyl copolymer (C) is 140° C. or higher.

### Claim 3 (depends on 1)

The polyamide composition according to claim 1, wherein the aromatic vinyl-derived structural unit contains a structural unit derived from at least one selected from the group consisting of styrene and α-methylstyrene.

### Claim 4 (depends on 1)

The polyamide composition according to claim 1, wherein the α,β-unsaturated dicarboxylic anhydride-derived structural unit contains a structural unit derived from at least one selected from the group consisting of maleic anhydride and a monoalkyl-maleic anhydride having an alkyl group having 1 or more and 3 or less carbon atoms.

### Claim 5 (depends on 1)

The polyamide composition according to claim 1, wherein the polyamide (A) is a semi-aromatic polyamide.

### Claim 6 (depends on 5)

The polyamide composition according to claim 5, wherein, in the semi-aromatic polyamide, more than 50 mol % of the structural unit derived from the dicarboxylic acid that constitutes the semi-aromatic polyamide is a structural unit derived from an aromatic dicarboxylic acid, and more than 50 mol % of the structural unit derived from the diamine that constitutes the semi-aromatic polyamide is a structural unit derived from an aliphatic diamine having 4 to 18 carbon atoms.

### Claim 7 (depends on 6)

The polyamide composition according to claim 6, wherein the aliphatic diamine is at least one selected from the group consisting of 1,6-hexanediamine, 1,9-nonanediamine, 2-methyl-1,8-octanediamine, and 1,10-decanediamine.

### Claim 8 (depends on 1)

The polyamide composition according to claim 1, wherein the flame retardant (B) is a bromine-based flame retardant.

### Claim 9 (depends on 1)

The polyamide composition according to claim 1, further comprising a filler (D).

### Claim 10 (depends on 9)

The polyamide composition according to claim 9, wherein the polyamide composition is prepared by melt-kneading the polyamide (A), the flame retardant (B), the aromatic vinyl copolymer (C) and the filler (D).

### Claim 11 (depends on 1)

The polyamide composition according to claim 1, wherein the polyamide composition is prepared by melt-kneading the polyamide (A), the flame retardant (B) and the aromatic vinyl copolymer (C).

### Claim 12 (depends on 1)

A molded article of the polyamide composition of claim 1.