Polyisocyanate mixtures which are liquid at greater than 5° c

Details Polyisocyanate mixtures which are liquid at greater than 5° c Polyisocyanate mixtures which are liquid at greater than 5° c

C - Chemistry, Metallurgy

07

C

C07C 275/60 (2006.01) C08G 18/78 (2006.01) C08G 18/79 (2006.01) C08G 18/83 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2141364

The present invention relates to polyisocyanate mixtures which are reaction products of 4,4'-diphenylmethane diisocyanate as the isocyanate component, are liquid at greater than 5°C and have an NCO content of 14.5 to 24% by weight and an allophanate group content (calculated as C2HN2O3, molecular weight = 101) of 7.7 to 14.5% by weight; a process for the production of these polyisocyanate mixtures by reacting 4,4'-diphenylmethane diisocyanate as the exclusive isocyanate component with one or more monohydric alcohols having 4 to 16 carbon atoms at an NCO/OH equivalent ratio of 5:1 to 8.5:1 and at a temperature of up to 160°C to form urethane groups and during or subsequent to urethane formation, converting the urethane groups to allophanate groups in the presence of a catalyst which promotes allophanate formation; and the use of these polyisocyanate mixtures as the polyisocyanate component in two-component polyurethane coating compositions.

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