Curable composition

Details Curable composition Curable composition

C - Chemistry, Metallurgy

08

G

C08G 65/32 (2006.01) C08G 65/336 (2006.01) C08K 5/57 (2006.01) C08L 71/02 (2006.01)

Patent

CA 2051702

The curable composition of the invention comprises (A) an oxypropylene polymer which contains, in its main polymer chain, a repeating unit of the formula Image and which has at least one silicon atom-containing group with a hydroxyl group or a hydrolyzable group being bound to the silicon atom and has an Mw/Mn ratio of not more than 1.6 and a number average molecular weight of not less than 6,000, and (B) 0.01 to 10 parts by weight, per 100 parts by weight of the oxypropylene polymer (A), of a reaction product derived from an organotin of the formula R5R6SnO wherein R5 and R6 each is a monovalent hydrocarbon group, and an ester compound, and exhibits fast curing characteristics. The cured products obtained are excellent in heat resistance and weather resistance.

Composition polymérisable comprenant cent parties en poids d'un polymère d'oxypropylène dans lequel la chaîne principale se compose d'unités à répétition de la formule (A), et comprenant au moins un groupe contenant un atome de silicium auquel est lié un groupe hydroxyle ou hydrolysable, un rapport Mw/Mn de 1,6 au moins, ainsi qu'une masse moléculaire moyenne de 6000 ou plus, et 0,01 à 10 bar en poids d'un produit de réaction d'un composé d'organo-étain R5R6SnO (dans lequel R5 et R6 représentent chacun un groupe hydrocarbure monovalent) avec un ester. On peut polymériser rapidement cette composition afin d'obtenir un produit présentant une excellente stabilité à la fois à la chaleur et aux agents atmosphériques.

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