| abstract |
Sulfamic acid modified polyisocyanate, which is prepared by a reaction of polyisocyanate and sulfamic acid with the formula of ** (See formula) **, where, R1 is one of cyclohexyl, methylcyclohexyl, p-methylcyclohexyl, 2-methylcyclohexyl, 2,3-dimethylcyclohexyl, 3,3,5-trimethylcyclohexyl, 4-tertbutylcyclohexyl, cycloheptyl, methylcyclooctyl, 2-norcamfanyl, 2-adamantyl and 3,5-dimethyl-1-adamantyl, R2 is butyl; or R1 is one of methylcyclohexyl, p-methylcyclohexyl, 2-methylcyclohexyl, 2,3-dimethylcyclohexyl, 3,3,5-trimethylcyclohexyl, 4-tertbutylcyclohexyl, cycloheptyl, methylcyclooctyl, 2-norcamfanyl, 2-dimethyl adamantyl and 3,5-dimethyl adamantyl -1-adamantyl, R2 is propyl; or R1 is one of cyclohexyl, methylcyclohexyl, p-methylcyclohexyl, 2-methylcyclohexyl, 2,3-dimethylcyclohexyl, 3,3,5-trimethylcyclohexyl, 4-tertbutylcyclohexyl, cycloheptyl, methylcyclooctyl, 2-norcamfanyl, and 3,5-2-norcamfanyl -dimethyl-1-adamantyl, R2 is isobutyl; preferably, R1 is one of cyclohexyl, methylcyclohexyl, p-methylcyclohexyl, and cycloheptyl, R2 is butyl; or R1 is methylcyclohexyl, p-methylcyclohexyl and 3,3,5-trimethylcyclohexyl, R2 is propyl; or R1 is cyclohexyl and methylcyclohexyl, R2 is isobutyl: the amount of said sulfamic acid is 0.5-20% by weight, preferably 1-10% by weight of the total weight of the polyisocyanate and sulfamic acid. |