Copolymer comprising a vinyl polysiloxane, an unsaturated polyester ester resin and a vinyl compound, and coating composition thereof

Claim 1

A COPOLYMER OF FROM 40 TO 60 PERCENT BY WEIGHT OF AN ORGANO POLYSILOXANE WHEREIN ANY ALKYL GROUPS THAT ARE PRESENT ARE IN AN AMOUNT UP TO 0.6 ALKYL GROUPS PER EACH SILICON ATOM, THE RATIO OF ARYL GROUPS TO SILICON ATOMS IS FROM 0.75 TO 1.25 PER EACH SILICON ATOM, THE RATIO OF VINYL GROUPS TO SILICON ATOMS IS FROM 0.05 TO 0.2 PER EACH SILICON ATOM, WITH THE RATIO OF THE TOTAL HYDROCARBON GROUPS TO SILICON ATOMS BEING FROM 1 TO 1.6 PER EACH SILICON ATOM, FROM 30 TO 50 PERCENT BY WEIGHT OF A POLYESTER CONTAINING AN AVERAGE OF BETWEEN 0.1 TO 1.0 RESIDUE OF AN OLEFINICALLY ALPHA, BETA UNSATURATED DICARBOXYLIC ACID PER POLYESTER MOLECULE SAID POLYESTER HAVING AN ACID NUMBER OF LESS THAN 50 AND FROM 5 TO 15 PERCENT BY WEIGHT OF A VINYL COMPOUND HAVING THE FORMULA CH2=CHR WHEREIN R IS A GROUP HAVING UNSATURATION IN CONJUGATION WITH THE CH2=CH- GROUP AND SELECTED FROM THE GROUP CONSISTING OF ARYL, HETEROCYCLIC, CARBALKOXY, CARBOXY, KETONIC, NITRILE AND AMIDO.