Cross-linking agents and thermosetting paints
AssigneeDegussa AG
InventorsPeter Speier, Friedrich Plogmann, Rainer Lomoelder, Andreas Wenning, Emmanouil Spyrou
Life of this patent
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Abstract
The present invention relates to new cross-linking agents and thermosetting paints, which lead to improved properties such as scratch resistance of cured thermosetting paints or exhibit good solubility.
Claims11
A cross-linking agent formed from the following starting components:
- (A) at least one aliphatic and/or cycloaliphatic polyisocyanate compound having ≧2 to 6 NCO function groups, obtained by trimerization, dimerization or formation of, biuret or allophanate, alone or in mixtures, and excluding polyisocyanates obtained from bis(4-isocyanatocyclohexyl)-methane;
- (B) at least one secondary 3-aminopropyltrialkoxysilane, wherein 1 to 90 mol % of the originally free isocyanate groups of said polyisocyanate have been reacted with said secondary 3-aminopropyltrialkoxysilane;
- (C) at least one blocking agent, wherein 10 to 99 mol % of the originally free isocyanate groups of said polyisocyanate have been reacted with said blocking agent, and the molar proportions of the reacted isocyanate groups add up to at least 95 mol %.
A process for preparing a cross-linking agent, said process comprising reacting (A) at least one aliphatic and/or cycloaliphatic polyisocyanate compound having ≧2 to 6 NCO function groups, obtained by trimerization, dimerization or formation of biuret or allophanate, alone or in mixtures, and excluding polyisocyanates obtained from bis(4-isocyanatocyclohexyl)-methane, with
- B) at least one secondary 3-aminopropyltrialkoxysilane, wherein 1 to 90 mol % of the originally free isocyanate groups of said polyisocyanate have been reacted with said 3-aminopropyltrialkoxysilane;
- and
- C) at least one blocking agent, wherein 10 to 99 mol % of the originally free isocyanate groups of said polyisocyanate have been reacted with said blocking agent, and wherein the molar proportions of the reacted isocyanate groups add up to at least 95 mol %.
A cross-linking agent, prepared by a process, said process comprising reacting (A) at least one aliphatic and/or cycloaliphatic polyisocyanate compound having ≧2 to 6 NCO function groups, obtained by trimerization, dimerization or formation of biuret or allophanate, alone or in mixtures, and excluding polyisocyanates obtained from bis(4-isocyanatocyclohexyl)-methane, with
- B) at least one secondary 3-aminopropyltrialkoxysilane, wherein 1 to 90 mol % of the originally free isocyanate groups of said polyisocyanate have been reacted with said 3-aminopropyltrialkoxysilane;
- and
- C) at least one blocking agent, wherein 10 to 99 mol % of the originally free isocyanate groups of said polyisocyanate have been reacted with said blocking agent, and wherein the molar proportions of the reacted isocyanate groups add up to at least 95 mol %.
Dependencies are inferred from the claim text.