Filled and reinforced polyamide molding compositions

Claim 1

A FILLED AND REINFORCED POLYAMIDE MOLDING COMPOSITION, IN WHICH A MINERAL FILLER IS CHEMICALLY COUPLED TO SAID POLYAMINE, COMPRISING, BY WEIGHT, 100 PARTS OF A POLYAMIDE RESIN AND FROM 5 TO 220 PARTS OF A FINEL DIVIDED MINEAL FILLER UNIFORMLY DISPERSED THROUGHOUT SAID RESIN, THE SURFACES OF SAID FILLER PARTICLES HAVING REACTIVE HYDROXYL FUNCTIONALITES, WHEREIN SAID COMPOSITION THE PRTICLE OF SAID FILLER ARE COATED WITH AND CHEMICALLY COUPLED TO SAID POLYAMIDE BY FROM 0.1% TO ABBOUT 5% BY WEIGHT, BASED ON SAID FILLER, OF AN AROMATIC COUPLING AGENT SELECTED FROM THE GROUP CONSISTING OF THOSE COMPOUNDS DESCRIBED BY THE FOLLOWING FORMULAE:

Claim 5

A method of forming a filled and reinforced polyamide molding composition, in which the filler is chemically coupled to the polyamide matrix, comprising: a. providing 100 parts by weight of a polyamide resin, b. providing from 5 to 220 parts by weight of a finely divided mineral filler having reactive hydroxyl functionalities on its surface, c. uniformly coating said filler with from 0.1% to 5% by weight, based on said filler, of a coupling agent selected from the group consisting of p-hydroxybenzoic acid and p-aminobenzoic acid, d. baking said coated filler at a temperature in the range of 150* C. to 220* C. for a time up to 60 minutes to chemically combined said coupling agent with said reactive hydroxyl functionalities on the surface of said filler, e. thoroughly blending said resin and said coated filler, f. extruding the resulting blend to temporarily melt said resin and uniformly disperse said coated filler throughout said polyamide resin, and thereby forming a hydrogen bond between said coupling agent and said polyamide resin, and g. chopping the resulting extrudate into particles to form a filled and reinforced thermoplastic molding composition.

Claim 6

A method of forming a filled and reinforced polyamide molding composition, in which the filler is chemically coupled to the polyamide matrix, comprising: a. providing 100 parts by weight of a polyamide resin, b. providing from 5 to 220 parts by weight of a finely divided mineral filler having reactive hydroxyl functionalities on its surface, c. uniformly coating said filler with from 0.1% to 5% by weight, based on said filler, of a coupling agent selected from the group consisting of p-hydroxybenzoic acid and p-aminobenzoic acid, d. baking said coated filler at a temperature in the range of 150* C. to 220* C. for a time up to 60 minutes to chemically combined said coupling agent with said reactive hydroxyl functionalities on the surface of said filler, e. thoroughly blending said resin and said coated filler, f. extruding the resulting blend to temporarily melt said resin and uniformly disperse said coated filler throughout said polyamide resin, and thereby forming a hydrogen bond between said coupling agent and said polyamide resin, and g. chopping the resulting extrudate into particles to form a filled and reinforced thermoplastic molding composition.