Method for producing polyester polyols having secondary oh...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/42 (2006.01) C08G 63/18 (2006.01) C08G 63/66 (2006.01) C08G 63/87 (2006.01) C08G 63/91 (2006.01)

Patent

CA 2760855

The invention relates to a method for producing polyester polyols having secondary hydroxyl terminal groups, comprising the step of reacting polyester comprising carboxyl terminal groups with an epoxide of the general formula (1), where R1 stands for an alkyl radical or an aryl radical, and the reaction is performed in the presence of a catalyst comprising at least one nitrogen atom per molecule. The method is characterized in that the polyester comprising carboxyl terminal groups has an acid number of = 25 mg KOH/g to = 400 mg KOH/g and a hydroxyl number of = 5 mg KOH/g, and that the polyester comprising carboxyl terminal groups is produced in that = 1.03 mol to = 1.90 mol of carboxyl groups or carboxyl group equivalents of an acid component are added per mol of hydroxyl groups of an alcohol. The polyester polyols comprising secondary hydroxyl terminal groups thus obtained can be used for producing polyurethane polymers.

L'invention concerne un procédé pour produire des polyols de polyester comportant des groupes terminaux hydroxyle secondaires, comprenant l'étape qui consiste à faire réagir un polyester comportant des groupes terminaux carboxyle avec un composé époxy de formule générale (I) dans laquelle R1 représente un groupe alkyle ou un groupe aryle, en présence d'un catalyseur qui comporte au moins un atome d'azote par molécule. Ce procédé est caractérisé en ce que le polyester comportant les groupes terminaux carboxyle présente un indice d'acidité allant d'une valeur = 25 mg KOH/g à = 400 mg KOH/g et un indice d'hydroxyle = 5 mg KOH/g, et en ce que le polyester comportant les groupes terminaux carboxyle est produit par addition d'une quantité = 1,03 mole et = 1,90 mole de groupes carboxyle ou d'équivalents de groupes carboxyle d'un composant acide pour chaque mole de groupes hydroxyle d'un alcool. Les polyols de polyester obtenus qui comportent les groupes terminaux hydroxyle secondaires sont utilisés pour produire des polymères de polyuréthane.

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