Reinforced polyamide moulding materials
First Claim
1. High rigid and simultaneously tough, reinforced polyamide moulding material, characterized by:
- heat distortion temperature values HDT/A (1.8 MPa) (measured according to ISO
75) of more than 242°
C., and HDT/C (8 MPa) of more than 150°
C., consisting of(1) a polyamide matrix consisting of a blend of the following components;
(A) polyamide 66,(B) copolyamide, composed of(b1) 50 to 80 parts by weight of units which are derived from terephthalic acid (T) in combination with hexamethylenediamine (6) in approximately equimolar ratio,(b2) 50 to 20 parts by weight of units which are derived from isophthalic acid (I) in combination with hexamethylenediamine in approximately equimolar ratio,wherein the copolyamide has a relative viscosity (RV), measured in 0.5% m-cresol solution, of between 1.4 and 1.8;
the parts by weight of the components (b1) and (b2) together giving 100 parts by weight,and (2) a filler component containing a mixture of;
(C) glass fibres and(D) carbon fibres,the percentages by weight of the components (A) to (D) together giving 100% and the components (A), (B), (C), and (D) fulfilling the following conditions;
(A)+(B);
20 to 39% by weight,weight ratio (A)/(B);
50/50 to 95/5,(C)+(D);
61 to 80% by weight,weight ratio (C)/(D);
80/20 to 95/5,the polyamide moulding material optionally containing (3) at least one additive (E) in addition to the components (A) to (D), and the amount thereof being additive to the sum of the components (A) to (D);
wherein the optional additive (E) is selected from the group consisting of inorganic stabilizers, organic stabilizers, lubricants, dyes, metallic pigments, metal spangles, metal-coated particles, halogen-containing flameproofing agents, halogen-free flameproofing agents, impact modifiers, antistatic agents, conductivity additives, demoulding agents, optical brighteners, natural sheet silicates, synthetic sheet silicates and mixtures thereof.
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Abstract
The present invention relates to reinforced polyamide molding materials which can be prepared from a polyamide blend and, for example, by compounding with cut fibers or continuous filaments on twin-screw extruders and have mechanical properties which are usually not compatible with one another, namely a combination of exceptionally high rigidity and strength and at the same time good toughness. Furthermore, a high heat distortion temperature (HDT) is achieved according to the invention.
The thermoplastic polyamide molding materials according to the invention are suitable for the production of moldings or other semifinished products or finished articles, which can be produced, for example, by extrusion, injection molding, direct methods or direct compounding, in which the compounded polyamide molding material is processed directly by injection molding, or other deformation techniques.
14 Citations
28 Claims
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1. High rigid and simultaneously tough, reinforced polyamide moulding material, characterized by:
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heat distortion temperature values HDT/A (1.8 MPa) (measured according to ISO
75) of more than 242°
C., and HDT/C (8 MPa) of more than 150°
C., consisting of(1) a polyamide matrix consisting of a blend of the following components; (A) polyamide 66, (B) copolyamide, composed of (b1) 50 to 80 parts by weight of units which are derived from terephthalic acid (T) in combination with hexamethylenediamine (6) in approximately equimolar ratio, (b2) 50 to 20 parts by weight of units which are derived from isophthalic acid (I) in combination with hexamethylenediamine in approximately equimolar ratio, wherein the copolyamide has a relative viscosity (RV), measured in 0.5% m-cresol solution, of between 1.4 and 1.8; the parts by weight of the components (b1) and (b2) together giving 100 parts by weight, and (2) a filler component containing a mixture of; (C) glass fibres and (D) carbon fibres, the percentages by weight of the components (A) to (D) together giving 100% and the components (A), (B), (C), and (D) fulfilling the following conditions; (A)+(B);
20 to 39% by weight,weight ratio (A)/(B);
50/50 to 95/5,(C)+(D);
61 to 80% by weight,weight ratio (C)/(D);
80/20 to 95/5,the polyamide moulding material optionally containing (3) at least one additive (E) in addition to the components (A) to (D), and the amount thereof being additive to the sum of the components (A) to (D); wherein the optional additive (E) is selected from the group consisting of inorganic stabilizers, organic stabilizers, lubricants, dyes, metallic pigments, metal spangles, metal-coated particles, halogen-containing flameproofing agents, halogen-free flameproofing agents, impact modifiers, antistatic agents, conductivity additives, demoulding agents, optical brighteners, natural sheet silicates, synthetic sheet silicates and mixtures thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification