| 摘要 |
Disclosed is a solventless continuous process for preparing a mixture of (semi)crystalline and amphorous blocked polyisocyanates, by: [I] reacting a mixture of (A) an aliphatic, (cyclo)aliphatic or cycloaliphatic diisocyanate compound and (B) an aliphatic, (cyclo)aliphatic or cycloaliphatic polyisocyanate compound containing an isocyanurate group with a blocking agent that is (C) 1,2,4-triazine or (D) a pyrazole compound, in an extruder, intensive compounder, intensive mixer or static mixer by intensive commixing and short term reaction with a supply of heat, and [II] isolating the resulting end product by rapid cooling.
|
