Photocrosslinkable polyurethanes

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/08 (2006.01) C08G 18/65 (2006.01) C08G 18/66 (2006.01) C08G 18/83 (2006.01) C08K 5/1515 (2006.01) C08L 75/16 (2006.01) G03F 7/038 (2006.01)

Patent

CA 2532440

Linear crosslinkable polyurethanes obtained from (a) at least one diisocyanate having 2 to 30 carbon atoms, (b) at least one aliphatic or cycloaliphatic diol having 2 to 30 carbon atoms, to whose carbon chain at least one carboxyl group is covalently bonded, and some or all of said carboxyl groups have been esterified with an olefinically unsaturated C3-C8alcohol or with the glycidyl ester of an olefinically unsaturated C3-C8carboxylic acid, and (c) optionally at least one aliphatic or cycloaliphatic diol having 2 to 30 carbon atoms, to whose carbon chain at least one carboxyl group is covalently bonded. The polyurethanes are suitable, alone or as a mixture with other reactive components, for thermal and/or photochemical crosslinking in crosslinkable compositions for the production of mouldings, coatings and in particular solder masks.

L'invention concerne des polyuréthanes linéaires réticulables, résultant de (a) au moins un di-isocyanate comportant entre 2 et 30 atomes de carbone, (b) au moins un diol aliphatique ou cycloaliphatique comportant entre 2 et 30 atomes de carbone, à la chaîne de carbone desquels est lié par covalence au moins un groupe carboxyle, certains ou tous lesdits groupes carboxyle ayant été estérifiés avec un alcool C¿3?-C¿8? insaturé par oléfine ou avec le glycidylester d'un acide carboxylique C¿3?-C¿8? insaturé par oléfine, et (c) éventuellement au moins un diol aliphatique ou cycloaliphatique comportant entre 2 et 30 atomes de carbone, à la chaîne carbone desquels est lié par covalence au moins un groupe carboxyle. Ces polyuréthanes s'utilisent seuls ou en mélange avec d'autres constituants réactifs, pour la réticulation thermique et/ou photochimique dans des compositions réticulables, dans la production de moulages, de revêtements et notamment de masques de soudure.

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