Patent ID: 6835799
Filing Date: 2004-12-28
Classification: C08G,C08J,Y10T

Abstract:
An intrinsically gel-free, randomly branched polyamide comprising at least units derived from:1. AB monomers, which monomers have both a carboxylic group (A) and an amine group (B), 2. at least one compound I, being a carboxylic acid (Av) or an amine (Bw), said at least one compound having a functionality w or v is 2 or 3, 3. at least one compound II, being a carboxylic acid (Av) or an amine (Bw) having a functionality w or v equal to 3, compound II being a carboxylic acid if compound I is an amine or compound II being an amine if compound I is a carboxylic acid; wherein a) the molar ratio of compound II to compound 1 is less than 1 where compound I is bifunctional; b) the molar ratio of compound II to compound I is less than 2 when compound I is trifunctional; c) the amounts of units derived from all carboxylic acids and amines in the polyamide satisfy formula P<1[(FAâˆ’1) (FBâˆ’1)]â€ƒâ€ƒ(1) â€ƒwhere P=[&Sgr;(ni fi)]x/[&Sgr;(ni fi)]Yâ€ƒâ€ƒ(2) â€ƒwhere P&lE;1 and either X=A and Y=B, or X=B and Y=A, and Fx=&Sgr;(nifi2)/&Sgr;(nifi)]â€ƒâ€ƒ(3) for, respectively, all carboxylic acids (X=A) and all amines (X=B), where fi is the functionality of either the carboxylic acid (fi=vi) or amine (fi=wi), ni being the number of moles of the carboxylic acid or amine and the summation involving all units derived from carboxylic acids and amines in the polyamide.