JP2003137966A5 - - Google Patents

Claims (5)

And polyisocyanates having Lee isocyanate group attached to a carbon of the aliphatic hydrocarbon at least two (A), after reacted with monoalcohol having 6 to 20 carbon atoms (B), to remove unreacted components A curing agent comprising a polyisocyanate mixture having a number average molecular weight of 400 to 1000 obtained in this manner, wherein the ratio of nitrogen atoms constituting allophanate groups to the total nitrogen atoms contained in the polyisocyanate mixture is 40% or more, isocyanate The proportion of nitrogen atoms constituting the group is 40% or more, the proportion of nitrogen atoms constituting the urethane bond is 10% or less, the proportion of nitrogen atoms constituting the isocyanurate group is 5% or less, and the nitrogen atoms constituting the uretdione group A polyisocyanate curing agent having a ratio of 5% or less. The polyisocyanate curing agent according to claim 1, wherein the polyisocyanate (A) is a diisocyanate having 4 to 15 carbon atoms of an aliphatic hydrocarbon to which an isocyanate group is bonded.   The ratio of nitrogen atoms constituting the allophanate group to 42% or more, the ratio of nitrogen atoms constituting the isocyanate group to 42% or more, and the ratio of nitrogen atoms constituting the urethane bond to the total nitrogen atoms contained in the polyisocyanate mixture The polyisocyanate curing agent according to claim 2, wherein the proportion of nitrogen atoms constituting the isocyanurate group is 1% or less and the proportion of nitrogen atoms constituting the uretdione group is 5% or less.   Allophanate catalyst in which polyisocyanate mixture reacts carboxylic acid metal salt and chlorocarboxylic acid, or allophanate catalyst in which 2-hydroxylalkyl / trialkylammonium carboxylate and chlorocarboxylic acid react The polyisocyanate curing agent according to claim 2, wherein the polyisocyanate curing agent is obtained by reacting the polyisocyanate (A) with the monoalcohol (B) in the presence of and then removing unreacted components.   Allophanate catalyst in which polyisocyanate mixture reacts carboxylic acid metal salt and chlorocarboxylic acid, or allophanate catalyst in which 2-hydroxylalkyl / trialkylammonium carboxylate and chlorocarboxylic acid react The polyisocyanate curing agent according to claim 3, which is obtained by reacting the polyisocyanate (A) with the monoalcohol (B) in the presence of and then removing unreacted components by distillation.