Polyurethane composition

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/10 (2006.01) C08G 18/08 (2006.01) C08G 18/12 (2006.01) C08G 18/28 (2006.01) C08G 18/32 (2006.01) C08G 18/48 (2006.01)

Patent

CA 2473361

The invention relates to compositions comprising at least one polyurethane prepolymer A with isocyanate terminal groups and at least one polyaldimine B. The polyurethane prepolymer A is produced from at least one polyol A1, optionally at least one polyol A2, in addition to polyisocyanates. The polyol A1 is a linear polyoxyalkylene polyol and has a degree of unsaturation of <0.04 mEq/g and the polyol A2 is present in a quantity of between 0 and 30 wt. %, preferably between 0 and 20 wt. % and in particular between 0 and 10 wt. %, in relation to the total quantity of A1+A2. In addition to the aforementioned components, a composition according to a preferred embodiment can also contain one or more of the following components: plasticizers, solvents, fillers, pigments, catalysts, rheology modifiers such as e.g. thickeners, coupling agents, dehydrators, antioxidants, light-protection agents and other conventional additives in the polyurethane industry.

L'invention concerne des compositions comprenant au moins un prépolymère polyuréthanne A comportant des groupes isocyanates et au moins une polyaldimine B. Le prépolymère polyuréthanne A est produit à partir d'au moins un polyol A1 et éventuellement à partir d'au moins un polyol A2 ainsi que de polyisocyanates. Le polyol A1 est un polyoxyalkylènepolyol linéaire et présente un degré d'insaturation inférieur à 0,04 mEq/g. Le pourcentage en poids du polyol A2 est compris entre 0 et 30 %, de préférence entre 0 et 20 %, en particulier entre 0 et 10 %, par rapport à la quantité totale de A1+A2. Dans un mode de réalisation préféré, une composition comprend, en plus desdits composés, un ou plusieurs des composés suivants : plastifiants, solvants, matières de charge, pigments, catalyseurs, modificateurs de rhéologie tels que des épaississants, agents adhésifs, déshydratants, antioxydants, photostabilisants et autres additifs usuels dans l'industrie des polyuréthannes.

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