Coordination complexes as polyesterification catalysts

Claim 1

In a process for the manufacture of solid fiber-forming polyesters or copolyesters of dicarboxylic acid compounds and aliphatic glycols in the presence of catalysts, the improvement which comprises using as a polyesterification catalyst a coordination complex of (A) and (B), wherein: (A) is a metal alkoxy halide selected from the group consisting of M(OR).sub.a x.sub.b wherein M is at least one of titanium, zinc, germanium, tin, lead, antimony and; R is alkyl, aryl, alkylaryl, arylalkyl, haloalkyl having from 1 to 20 carbon atoms; a and b are integers having a value of from 1 to 3; the sum of (a+b) is equal to or less than the integer 4; x is at least one of F, Cl, Br or I; with the proviso that when M is antimony a is an integer having a value of from 1 to 4 and the sum (a+b) is equal to or less than 5; (B) is a silicon compound selected from the group consisting of: ##STR6## wherein W is CH 2 ═CX-- or ##STR7## X is hydrogen or methyl and is methyl only when m is one; R* is alkyl or haloalkyl having from 1 to 4 carbon atoms; R** is is methyl, ethyl, butyl, acetoxy, methoxy, ethoxy or butoxy; R is methyl, ethyl, butyl, methoxy, ethoxy, butoxy, or trimethylsiloxy; R' is methyl, methoxy, ethoxy, butoxy or trimethylsiloxy; R" is methoxy, ethoxy, butoxy, trimethylsiloxy or vinyldimethylsiloxy; R'" is methyl, ethyl, butyl or trimethylsilyl; Me is methyl; Z is methyl or W; Q is an NCCH 2 --, NH 2 CH 2 NHCH 2 --, NC--HS-- or HSCH 2 CH 2 S-- group; n is an integer having a value of from 2 to 5; m is an integer having a value of zero or one; x is an integer having a value of from 1 to 100; and y is an integer having a value of from 1 to 100; wherein the mole ratio of A:B in said coordination complex is from 2:1 to 1:10.