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US 2003/0158368 A1Published application
Catalyst and process for preparing color-reduced polyisocyanates containing isocyanurate groups
AssigneeDegusa AG
InventorsStephan Kohlstruk, Lutz Mindach, Michael Ewald
Life of this patent
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Abstract
The present invention relates to a catalyst and to a process for preparing color-reduced polyisocyanates containing isocyanurate groups.
Claims11
A process for preparing color-reduced polyisocyanates containing isocyanurate groups, comprising:
- trimerizing at least one diisocyanate in the presence of 0.04-2% by weight, based on the weight of said diisocyanate, at least one trimerization catalyst of the formula (I):
- 5
- and wherein
- A, B, C, D and E independently of one another or simultaneously are hydrogen, chloro, C1-C4 alkyl, C1-C4 alkoxy, C1-C4 alkoxycarbonyl, hydroxyl, (R5)3SiO—, (R5)2N—, —COOH, (R5)2N—CH2— or phenyl, it being possible for any two adjacent A, B, C, D and E radicals to form a conjoint 5- or 6-membered saturated or unsaturated ring which may optionally and additionally include N, S or O as heteroatom;
- F is hydrogen or methyl;
- R2 and R3 independently of one another or simultaneously are C1-C4 alkyl, C2-C6 hydroxyalkyl with the hydroxyl group in position 2 relative to the quaternary nitrogen or R1;
- R4 is hydrogen, methyl, C2-C10 alkyl, C3-C8 cycloalkyl or C2-C12 alkoxy;
- R5 is C1-C4 alkyl;
- Y− is R6COO− or OH−;
- and
- R6 is hydrogen or a branched or unbranched, aliphatic or araliphatic, C1-C10 alkyl radical.
8 more elements
A trimerization catalyst of the formula (I):
- 6
- and where the variables are defined as follows:
- A, B, C, D and E independently of one another or simultaneously are hydrogen, chloro, C1-C4 alkyl, C1-C4 alkoxy, C1-C4 alkoxycarbonyl, hydroxyl, (R5)3SiO—, (R5)2N—, —COOH, (R5)2N—CH2— or phenyl, it being possible for any two adjacent A, B, C, D and E radicals to form a conjoint 5- or 6-membered saturated or unsaturated ring which may optionally and additionally include N, S or O as heteroatom;
- F is hydrogen or methyl;
- R2 and R3 independently of one another or simultaneously are C1-C4 alkyl, C2-C6 hydroxyalkyl with a hydroxyl group in position 2 relative to the quaternary nitrogen in formula (I), or R1;
- R4 is hydrogen, methyl, C2-C10 alkyl, C3-C8 cycloalkyl or C2-C12 alkoxy;
- R5 is C1-C4 alkyl;
- Y− is R6COO− or OH−;
- and
- R6 is hydrogen or a branched or unbranched, aliphatic or araliphatic, C1-C10 alkyl radical.
7 more elements
Dependencies are inferred from the claim text.