Process for the production of polyisocyanates containing isocyanurate groups from aliphatic and aromatic isocyanate compounds
First Claim
1. A process for the production of an isocyanurate group-containing polyisocyanate which comprises catalytically trimerizing a mixture ofa) 10 to 90 parts by weight of a low molecular weight isocyanate component A) having aliphatically and/or cycloaliphatically bound isocyanate groups, an average molecular weight of 128 to 800 and an average NCO functionality of 1.7 to 2.2 andb) 10 to 90 parts by weight of a low molecular weight isocyanate component B) having aromatically bound isocyanate groups, an average molecular weight of 148 to 800 and an average NCO functionality of 1.7 to 2.2,in the presence of 0.1 to 10 parts by weight, per 100 parts by weight of isocyanate components A) and B), of an aminosilyl compound C) corresponding to the formula ##STR2## wherein R1 represents hydrogen or a saturated or unsaturated C1 -C22 aliphatic, C5 -C20 cycloaliphatic or C6 -C24 aromatic hydrocarbons optionally substituted with Cl or Br,R2 represents a saturated or unsaturated C1 -C22 aliphatic, C5 -C20 cycloaliphatic or C6 -C24 aromatic hydrocarbons optionally substituted with Cl or Br or represents the group SiR3 R4 R5 group, provided that R1 and R2 may also form a heterocyclic ring having 2 to 6 carbon atoms in which carbon atoms present in the ring may be replaced by heteroatoms andR3, R4 and R5 are the same or different and represent saturated or unsaturated C1 -C22 aliphatic, C1 -C20 cycloaliphatic or C6 -C24, aromatic hydrocarbons optionally substituted with Cl or Br,and subsequently removing excess, distillable isocyanate components A) and B) to obtain a polyisocyanate having a monomer content of less than 0.7%, based on the weight of polyisocyanate solids.
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Abstract
A process for the production of polyisocyanates containing isocyanurate groups by the catalytic trimerization of a mixture of low molecular weight isocyanate components having aliphatically and aromatically bound isocyanate groups in the presence of aminosilyl compounds, the resulting polyisocyanates and their use in coating compositions.
22 Citations
20 Claims
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1. A process for the production of an isocyanurate group-containing polyisocyanate which comprises catalytically trimerizing a mixture of
a) 10 to 90 parts by weight of a low molecular weight isocyanate component A) having aliphatically and/or cycloaliphatically bound isocyanate groups, an average molecular weight of 128 to 800 and an average NCO functionality of 1.7 to 2.2 and b) 10 to 90 parts by weight of a low molecular weight isocyanate component B) having aromatically bound isocyanate groups, an average molecular weight of 148 to 800 and an average NCO functionality of 1.7 to 2.2, in the presence of 0.1 to 10 parts by weight, per 100 parts by weight of isocyanate components A) and B), of an aminosilyl compound C) corresponding to the formula ##STR2## wherein R1 represents hydrogen or a saturated or unsaturated C1 -C22 aliphatic, C5 -C20 cycloaliphatic or C6 -C24 aromatic hydrocarbons optionally substituted with Cl or Br, R2 represents a saturated or unsaturated C1 -C22 aliphatic, C5 -C20 cycloaliphatic or C6 -C24 aromatic hydrocarbons optionally substituted with Cl or Br or represents the group SiR3 R4 R5 group, provided that R1 and R2 may also form a heterocyclic ring having 2 to 6 carbon atoms in which carbon atoms present in the ring may be replaced by heteroatoms and R3, R4 and R5 are the same or different and represent saturated or unsaturated C1 -C22 aliphatic, C1 -C20 cycloaliphatic or C6 -C24, aromatic hydrocarbons optionally substituted with Cl or Br, and subsequently removing excess, distillable isocyanate components A) and B) to obtain a polyisocyanate having a monomer content of less than 0.7%, based on the weight of polyisocyanate solids.
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14. An isocyanurate group-containing polyisocyanate which is prepared by a process comprising catalytically trimerizing a mixture of
a) 10 to 90 parts by weight of a low molecular weight isocyanate component A) having aliphatically and/or cycloaliphatically bound isocyanate groups, an average molecular weight of 128 to 800 and an average NCO functionality of 1.7to 2.2 and b) 10 to 90 parts by weight of a low molecular weight isocyanate component B) having aromatically bound isocyanate groups, an average molecular weight of 148 to 800 and an average NCO functionality of 1.7 to 2.2, in the presence of 0.1 to 10 parts by weight, per 100 parts by weight of isocyanate components A) and B), of an aminosilyl compound C) corresponding to the formula ##STR3## wherein R1 represents hydrogen or a saturated or unsaturated C1 -C22 aliphatic, C5 -C20 cycloaliphatic or C6 -C24 aromatic hydrocarbons optionally substituted with Cl or Br, R2 represents a saturated or unsaturated C1 -C22 aliphatic, C5 -C20 cycloaliphatic or C6 -C24 aromatic hydrocarbons optionally substituted with Cl or Br or represents the group SiR3 R4 R5 group, provided that R1 and R2 may also form a heterocyclic ring having 2 to 6 carbon atoms in which carbon atoms present in the ring may be replaced by heteroatoms and R3, R4 and R5 are the same or different and represent saturated or unsaturated C1 -C22 aliphatic, C5 -C20 cycloaliphatic or C6 -C24 aromatic hydrocarbons optionally substituted with Cl or Br, and subsequently removing excess, distillable isocyanate components A) and B) to obtain a polyisocyanate having a monomer content of less than 0.7%, based on the weight of polyisocyanate solids.
Specification