Patent ID: 11912836
Assignee: ARKEMA FRANCE
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A method for limiting warping of an object while maintaining the process cycle time, comprising the step of forming said object from a composition comprising:
(a) from 25 to 65 wt % of the total weight of the composition, at least one semi-crystalline copolyamide A/X1Y wherein:
A is a repeating unit obtained from the polycondensation of at least one C6 to C12 lactam or of at least one C6 to C12 amino acid or at least one repeating unit XY obtained from the polycondensation of at least one C4 to C18 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,
X1Y is a repeating unit obtained from the polycondensation of a diamine (X1) 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/X1Y ratio by weight being comprised from 60/40 to 95/5,
(b) fiberglass with a circular cross-section, and
(c) from 0.1 to 2% by weight of at least one additive and, optionally, at least one impact modifier,
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.