Patent ES-309424-A1 (ES)
Title: Sulphurized polyesters
IPC: C08G75/02
Filed: 1965-02-16
Abstract: Novel polyesters containing -CH 2 -S- groups and consisting essentially of products of the type where R1 is alkyl, R11 is the residue of a dicarboxylic acid R11(COOH) 2 , x is an integer greater than 1 and A is where R is H or optionally substituted alkyl, cycloalkyl, aryl or aralkyl and n is an integer from 2 to 8 are prepared by first heat-reacting one mole of liquid polythioformaldehyde consisting essentially of dithiols of type HS (CH 2 S) n H with 2 moles of the carbonate of an olefin R-CH=CH 2 or with a glycol mono- or di-ester corresponding to the oxide thereof, in the presence of an alkaline catalyst to form a polythiomethylene diol HO-A-OH, then heating this with a dicarboxylic acid or a dialkyl ester or anhydride thereof. The last stage is preferably effected stepwise, intermediates of types R1OOC-R11-COO-A-OH and R1-OOC-R11-COO-A-OOC-R11- COOR1 being isolated. Intermediates of formula HOH 2 C-CH 2 S-(CH 2 S) 3 . 5 CH 2 CH 2 OH which is then fractionated and p-CH 3 OOCC 6 H 4 -COOCH 2 CH 2 -S(CH 2 S) 5 -CH 2 CH 2 OH are isolated in examples. Reference has been directed by the Comptroller to Specification 981,346.Novel polyesters containing -CH2-S- groups and consisting essentially of products of the type R1-OOC-[R11-COO-A-OOC]x-R11-COO-R1 where R1 is alkyl R11 is the residue of a dicarboxyli acid R11 (COOH)2, x is an integer greater than 1 and A is <FORM:1084352/C3/1> where R is H or optionally substituted alkyl, cycloalkyl, aryl or aralkyl and n is an integer from 2 to 8 are prepared by first heat reacting one mole of liquid polythioformaldehyde consisting essentially of dithiols of type HS(CH2S)nH with 2 moles of the carbonate of an olefin R-CH = CH2 or with a glycol mono- or diester corresponding to the oxide thereof, in the presence of an alkaline catalyst to form a polythiomethylene diol HO-A-OH, then heating this with a dicarboxylic acid or a dialkyl ester or anhydride thereof. The last stage is preferably effected stepwise, intermediates of types R1OOC-R11-COO-A-OH and R1-OOC-R11-COO-A-OOC-R11-COOR1 being isolated. Reference has been directed by the Comptroller to Specification 981,346. ALSO: Novel polyesters containing -CH2-S-groups and consisting essentially of products of the type R1-OOC-[R11-COO-A-OOC]xR11-COOR1 where R1 is alkyl, R11 is the residue of a dicarboxylic acid R11(COOH)2, x is an integer greater than 1 and A is <FORM:1084352/C2/1> where R is H or optionally substituted alkyl, cycloalkyl, aryl or aralkyl and n is an integer from 2 to 8 are prepared by first heat-reacting one mole of liquid polythioformaldehyde consisting essentially of dithiols of type HS (CH2S)nH with 2 moles of the carbonate of an olefin R-CH=CH2 or with a glycol mono- or di-ester corresponding to the oxide thereof, in the presence of an alkaline catalyst to form a polythiomethylene diol HO-A-OH then heating this with a dicarboxylic acid or a dialkyl ester or anhydride thereof. The last stage is preferably effected stepwise, intermediates of types R1OOC-R11-COO-A-OH and R1-OOC-R11-COO-A-OOC-R11-COOR1 being isolated. Intermediates of formula HOH2C-CH2S-(CH2S)3. 5CH2 CH2OH which is then fractionated and p-CH3OOC-C6H4 -COOCH2CH2-S(CH2S)5 - CH2CH2\t OH are isolated in examples. Reference has been directed by the Comptroller to Specification 981,346.