Use of a copolyamide composition as a matrix of filler material with glass fibres having a circular cross section for limiting warping

Patent metadata

Field	Value
Publication number	US-12371539-B2
Application number	US-202418417290-A
Country	US
Kind code	B2
Filing date	Jan 19, 2024
Priority date	Sep 25, 2017
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

The invention relates to the use of a composition comprising at least one semi-crystalline copolyamide A/X1Y in which: —A is a repeat unit obtained from the polycondensation of at least one C6 to C12 lactam, or at least one repeat unit XY obtained from the polycondensation of at least one aliphatic C4 to C18 diamine (X), and of at least one aliphatic C6 to C18, in particular C6 to C12, dicarboxylic acid (Y), —X1Y is a repeat unit obtained from the polycondensation of a diamine (X1) chosen from an arylamine, a cycloaliphatic diamine and a branched aliphatic diamine and of at least one aliphatic dicarboxylic acid (Y) identical to that of the unit XY, the A/X1Y weight ratio being from 60/40 to 95/5, glass fibres having a circular cross section, and optionally at least one impact modifier and/or at least one additive, for limiting warping while at the same time maintaining the cycle time of the obtained composition suitable for processing thereof, in particular by injection moulding.

First claim

The invention claimed is:

1. A composition for producing a formed object, the composition being configured to limit warping of the object while maintaining a process cycle time, the composition comprising:
(a) from 25 to 64.9% by weight of at least one copolyamide A/X 1 Y, wherein:
A is a repeating unit obtained from the polycondensation of at least one C 6 to C 12 lactam or of at least one C 6 to C 12 amino acid or at least one repeating unit XY obtained from the polycondensation of at least one C 4 to C 18 aliphatic diamine (X) and at least one aliphatic dicarboxylic acid (Y) selected from the group consisting of suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, brassylic acid, tetradecanedioic acid, pentadecanedioic acid, hexadecanedioic acid and octadecanedioic acid,
X 1 Y is a repeating unit obtained from the polycondensation of a diamine (X 1 ) chosen from an arylamine, a cycloaliphatic diamine, or a branched aliphatic diamine, and at least one aliphatic dicarboxylic acid (Y) selected from the group consisting of adipic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, brassylic acid, tetradecanedioic acid, pentadecanedioic acid, hexadecanedioic acid and octadecanedioic acid,
the A/X 1 Y ratio by weight being comprised from 60/40 to 95/5,

(b) from 35 to 74.9% by weight of fiberglass with a circular cross-section,
(c) optionally, from 0 to 10% by weight of at least one impact modifier,
(d) from 0.1 to 2% by weight of at least one additive,
wherein the at least one additive is selected from the group consisting of fillers, colorants, stabilizers, plasticizers, surfactants, nucleating agents, pigments, whitening agents, antioxidants, lubricants, flame retardants, and waxes.

2. The composition according to claim 1 , wherein A is a repeating unit XY.

3. The composition according to claim 2 , wherein X corresponds to a C 6 to C 12 aliphatic diamine.

4. The composition according to claim 2 , wherein X is hexamethylene diamine or decanediamine.

5. The composition according to claim 1 , wherein A is a repeating unit XY, and Y in unit XY is a aliphatic dicarboxylic acid selected from the group consisting of suberic acid, azelaic acid, sebacic acid, undecanedioic acid and dodecanedioic acid.

6. The composition according to claim 5 , wherein Y in unit XY is sebacic acid.

7. The composition according to claim 1 , wherein A is a repeating unit obtained from the polycondensation of a C 6 to C 12 lactam.

8. The composition according to claim 1 , wherein A is a repeating unit obtained from the polycondensation of a C 6 to C 12 amino acid.

9. The composition according to claim 1 , wherein X 1 is an arylamine chosen from meta-xylylene diamine (MXD) and para-xylylene diamine (PXD).

10. The composition according to claim 1 , wherein X 1 is a cycloaliphatic diamine selected from the group consisting of bis(aminomethyl)cyclohexane (BAC), 3,3′-dimethyl-4,4′-diamino-dicyclohexyl-methane (BMACM or MACM), and bis-(p-aminocyclohexyl)-methane (PACM).

11. The composition according to claim 10 , wherein said cycloaliphatic diamine is bis(aminomethyl)cyclohexane (BAC).

12. The composition according to claim 1 , wherein X 1 is a branched aliphatic diamine selected from the group consisting of 2-methyloctanediamine (MOMD), methylpentamethylene diamine (MPMD) and trimethylhexanemethylene diamine (TMDA).

13. The composition according to claim 1 , wherein X 1 is selected from the group consisting of meta-xylylene diamine (MXD), para-xylylene diamine (PXD), bis(aminomethyl)cyclohexane (BAC) and methylpentamethylene diamine (MPMD).

14. The composition according to claim 1 , wherein the composition comprises the at least one impact modifier.

15. The composition according to claim 1 , wherein the fiberglass has an L/D ratio less than 2.

16. The composition according to claim 1 , wherein the composition comprises:
from 35 to 64.9% by weight of said at least one copolyamide A/X 1 Y,
from 35 to 64.9% by weight of said fiberglass with a circular cross-section,
from 0 to 10% by weight of said at least one impact modifier,
from 0.1 to 2% by weight of said at least one additive.

17. An object comprising the composition as defined in claim 1 .

18. The object according to claim 17 , wherein said object is a single-layer structure or at least one layer of a multilayer structure.

19. The object according to claim 18 , wherein the structure is in the form of an injected part.

20. The object according to claim 17 , wherein said object is used in the electrical and/or electronics field.

Assignees

• Arkema France

Inventors

• Cassiano Gaspar Stefania
• Brule Benoit

Classifications

• C08L77/06 Primary

  Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence) · CPC title

• C08J2377/06

  Polyamides derived from polyamines and polycarboxylic acids (C08J2377/10 takes precedence) · CPC title

• C08G69/265

  from at least two different diamines or at least two different dicarboxylic acids · CPC title

• C08J5/043 Primary

  with glass fibres · CPC title

• C08G69/36

  derived from amino acids, polyamines and polycarboxylic acids · CPC title