Process for preparation of polyester

Details Process for preparation of polyester Process for preparation of polyester

C - Chemistry, Metallurgy

08

G

400/3008

C08G 63/127 (2006.01) C08G 63/199 (2006.01) C08G 63/78 (2006.01)

Patent

CA 2001706

PROCESS FOR PREPARATION OF POLYESTER ABSTRACT OF THE DISCLOSURE A polyester having a high degree of polymerization is prepared in a short time by a process wherein a precondensate obtained from (A) an alicyclic diol or a mixture of an alicyclic diol and an alicyclic diol and (B) an aromatic dicarboxylic acid or a functional derivative thereof in the form of fine particles is dispersed in a silicone oil by using a graft polymer comprising a polyorganosiloxane as the backbone and a polymer of a monoethylenically unsaturated monomer as the branch or a graft polymer comprising a polymer of a monoethylenically unsaturated monomer as the backbone and a polyorganosiloxane as the branch as a dispersion stabilizer; and the dispersion is subjected to heat polymerization at a final polymerization temperature of from a temperature lower by 40°C than the melting point of the obtained polyester to a temperature higher by 20°C than the melting point thereof.

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