Production process of a polymerizable hyperbranched polyester

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 63/91 (2006.01) C08F 290/06 (2006.01) C08F 299/04 (2006.01) C08G 63/60 (2006.01) C08G 63/85 (2006.01)

Patent

CA 2507111

A polybranced polyester polyol (A) obtained by condensation-polymerizing a polyhydroxymonocarboxylic acid which has at least two hydroxy groups and in which the carbon atom adjacent to the carboxy group is a saturated carbon atom and all of the hydrogen atoms on the carbon atom have been replaced and an alkyl ester (B) of a carboxylic acid having a polymerizable unsaturated double bond are subjected to transesterification in the presence of at least one transesterification catalyst selected from the group consisting of dialkyltin oxides and stannoxanes. Thus, a polymerizable polybranched polyester having the polymerizable unsaturated double bond incorporated at a molecular end of the polybranched polyester polyol (A) is highly efficiently produced without causing a nucleophilic addition reaction between a terminal hydroxy group of the polybranched polyester polyol (A) and the polymerizable unsaturated double bond or side reactions such as thermal polymerization of the polymerizable unsaturated double bond.

Un polyol polyester polyramifié (A), que l'on obtient en soumettant à une polymérisation par condensation un acide polyhydroxymonocarboxylique qui possède au moins deux groupes hydroxy et dans lequel l'atome de carbone adjacent au groupe carboxy est un atome de carbone saturé et tous les atomes d'hydrogène sur l'atome de carbone ont été remplacés, et un ester d'alkyle (B) d'un acide carboxylique ayant une double liaison insaturée polymérisable sont soumis à une transestérification en présence d'au moins un catalyseur de transestérification sélectionné dans le groupe constitué par des oxydes de dialkylétain et des stannoxanes. Il est ainsi possible de produire très efficacement un polyester polyramifié polymérisable ayant la double liaison insaturée polymérisable intégrée au niveau d'un extrémité moléculaire du polyol polyester polyramifié (A) sans provoquer de réaction d'addition nucléophile entre un groupe hydroxy terminal du polyol polyester polyramifié (A) et la double liaison insaturée polymérisable, ni de réactions secondaires telles qu'une polymérisation thermique de la double liaison insaturée polymérisable.

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