Polyesterurethane elastomers and process for their production

Details Polyesterurethane elastomers and process for their production Polyesterurethane elastomers and process for their production

C - Chemistry, Metallurgy

08

G

C08G 18/66 (2006.01) C08G 18/08 (2006.01) C08G 18/30 (2006.01) C08G 18/42 (2006.01) C08G 18/44 (2006.01) C08G 18/48 (2006.01)

Patent

CA 2325921

The present invention has for its object to provide an ester elastomer having a high block of the hard and soft segment components, high flexibility, and good mechanical properties at high temperature, particularly high temperature creep resistance and a process for producing said ester elastomer. The present invention relates to an ester elastomer which is a block copolymer comprising a polyester copolymer (A) and a polymer having hydroxyl groups at both terminal ends (B) coupled to each other through the intermediary of a urethane component (C) consisting in a group of the general formula (1): -O-CO-NH-R1-NH- CO-O-, (wherein R1 represents an alkylene group containing 2 to 15 carbon atoms, -C6H4-, -C6H4-CH2-, -C6H4-CH2-C6H4- (where -C6H4- represents phenylene)) or a group of the general formula (2): -O-CO-NH-R2-NH-CO- (wherein R2 represents an alkylene group containing 2 to 15 carbon atoms, -C6H4-, -C6H4- CH2- or C6H4-CH2-C6H4- (wherein -C6H4- represents phenylene)).

L'invention porte sur un élastomère d'esters présentant un fort bloc de segments constitutifs durs et mous, une grande souplesse et de bonnes propriétés mécaniques à température élevée, dont la résistance au fluage, et sur son procédé de production. Ledit élastomère est un copolymère bloc comprenant un copolymère de polyester (A) et un polymère (B) présentant des groupes hydroxyle à ses deux extrémités reliés entre eux par l'intermédiaire d'un élément d'uréthane (C), soit de formule (1): -O-CO-NH-R?1¿-NH-CO-O-, dans laquelle R?1¿ représente un groupe alkylène C¿2? à C¿15?, -C¿6?H¿4?-, -C¿6?H¿4?-CH¿2?-, ou -C¿6?H¿4?-CH¿2?-C¿6?H¿4?- (-C¿6?H¿4?- représentant phénylène), soit de formule (2): -O-CO-NH-R?2¿-NH-CO-O-, dans laquelle R?2¿ représente un groupe alkylène C¿2? à C¿15?, -C¿6?H¿4?-, -C¿6?H¿4?-CH¿2?-, -C¿6?H¿4?-CH¿2?-C¿6?H¿4?- (-C¿6?H¿4?- représentant phénylène).

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