Polyamide moulding material with improved properties
AssigneeEms-Chemie AG
InventorsFriedrich Severin Bühler, Alwin Hermann Schwitzer
Life of this patent
Estimating the term…
Abstract
The present invention relates to semiaromatic semi-crystalline thermoplastic polyamide moulding materials having improved processing behavior, increased flowability, improved surface quality and improved mechanical properties, in particular, in conditioned state, the matrix of the polyamide moulding materials according to the present invention comprising at least 3 components: a semi-crystalline copolyamide (A) having the composition 66/6I/6T, a PA prepolymer (B) having the composition 6T/6I/66 or 6T/6I/6 and an amorphous copolyamide (C) having the composition 6I/6T.
Claims24
Semiaromatic semi-crystalline thermoplastic polyamide moulding materials comprising at least three of the following components (A), (B), (C) as polyamide matrix:
- (A) 42 to 98 wt.-% of a semi-crystalline copolyamide formed by
- (a1) 47 to 90 wt.-% of units derived from adipic acid in combination with hexamethylene diamine in approximate equimolar ratio or from caproplactam and/or from ω-amino acids having 6 C atoms,
- (a2) 50 to 7 wt.-% of units derived from isophthalic acid in combination with hexamethylene diamine in approximate equimolar ratio,
- (a3) 40 to 3 wt.-% of units derived from terephthalic acid in combination with hexamethylene diamine in a approximate equimolar ratio,
- wherein the weight percentage of the components (a1) to (a3) add up all together to 100%;
- (B)9 to 1 wt.-% of prepolymeric polyamides having a solution viscosity (ηrel.) of 1.01-1.30, as measured in 0.5% m-cresol, formed by
- (b1) 40 to 90 wt.-% of units derived from terephthalic acid in combination with hexamethylene diamine in approximate equimolar ratio,
- (b2) 50 to 10 wt.-% of units derived from isophthalic acid in combination with hexamethylene diamine in approximate equimolar ratio,
- (b3) 0 to 50 wt.-% of units derived from adipic acid in combination with hexamethylene diamine in approximate equimolar ratio, from caproplactam, or from ω-amino acids having 6 C atoms,
- wherein the weight percentage of the components (b1) to (b3) add up all together 100%;
- (C) 49 to 1 wt.-% of an amorphous copolyamide formed by
- (c1) 40 to 90 wt.-% of units derived from isophthalic acid in combination with hexamethylene diamine in equimolar ratio,
- (c2) 50 to 10 wt.-% of units derived from terephthalic acid in combination with hexamethylene diamine in equimolar ratio,
- (C3) 0 to 50 wt.-% of units derived from adipic acid in combination with hexamethylene diamine in approximate equimolar ratio, from caproplactam, or from ω-amino acids having 6 C atoms,
- wherein the weight percentage of the components (c1) to (c3) add up all together 100%;
- and wherein further additives (D), (E) and (F) can be comprised in the moulding materials:
- (D)0 to 70 wt.-% of a fibrous, particle type filling material, or reinforcing material or mixtures thereof,
- (E) 0 to 6 wt.-% of carbon black,
- (F) 0 to 30 wt.-% of usual additives and processing aid agents,
- wherein the weight percentages of the components (A) to (F) add up all together 100%.
Dependencies are inferred from the claim text.