Patent ID: 6756429
Filing Date: 2004-06-29
Classification: C08K

Abstract:
A process for making a long fiber reinforced polyamide composite comprising a homogeneous mixture of polyamide resin and long fiber pellets, wherein the pellets comprise from 5 wt. % to about 60 wt. % reinforcing fibers and polyamide,the process comprises (i) incorporating a polyamide compound and at least one pigment, in a heated extrusion mixing zone, said zone conveying a composited melt into a shaping zone, said mixing under heat and rotational shear, together with (ii) pellets of a composite of long fiber-reinforced polyamide, the long fiber-reinforced polyamide pellets prior to combining therewith comprise fibers equal to the pellet length, and polyamide and a compound of the formula A and/or B, where Aâ€² in (A) comprises a functional group which is an amine, a hydrolyzable group which forms an amine, an amide-forming group; R* is methyl or other lower (C2-C4 alkyl); and Râ€³ is selected from the group consisting of hydrogen; alkyl of 1 to 3 carbons; and â€”OR4 in which R4 is selected from the group consisting of hydrogen, methyl, and alkyl containing 1 to 7 carbons; and (B) including dimers and trimers, in which at least one of R40 is â€”OH, â€”OR, and at least one of R40 is Ra, Rb, or Rc. wherein R* and Râ€² have the same meaning as Aâ€² above.