The invention relates to thioallophanates which contain silane groups and are of the general formula (I) ##STR00001##
in which R.sup.1, R.sup.2 and R.sup.3 are identical or different radicals and are each a saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic radical or an optionally substituted aromatic or araliphatic radical having up to 18 carbon atoms, where said radical may optionally contain up to 3 heteroatoms from the group of oxygen, sulphur and nitrogen, X is a linear or branched organic radical having at least 2 carbon atoms, Y is a linear or branched, aliphatic or cycloaliphatic radical or an araliphatic or aromatic radical having up to 18 carbon atoms, and n is an integer from 1 to 20, to a process for preparation thereof, and to the use thereof as starting components in the production of polyurethane plastics.

A coating or plastics formulation contains a reaction product of at least one alkoxysilane-containing isocyanurate of the formula (I)

##STR00001##

with at least one hydrophilizing agent of the formula BOH which has at least one OH group, wherein R.sup.1, R.sup.2 and R.sup.3 in each case independently of one another are a linear or branched and/or cyclic C1-C8 alkylene radical, R, R and R in each case independently of one another are a linear or branched and/or cyclic C1-C8 alkyl radical, and B is a hydrophilic radical.

The present invention relates to non-aqueous coating agent compositions, containing at least one polyol (A), at least one silane-modified compound (B) of formula (I), optionally one or more silane-free aliphatic or cycloaliphatic polyisocyanates (C) having free or blocked isocyanate groups, and at least one catalyst (D) for the cross-linking of the silane groups. Furthermore, the non-aqueous coating agent compositions according to the invention can contain one or more surface additives (E) and one or more non-aqueous solvents (F).

The present invention provides nonaqueous coating material compositions, multistage coating processes and also the use of the coating material compositions, comprising (A) at least one polyhydroxyl-group-containing compound, (B1) at least one polyisocyanate-group-containing compound (B1) having free or blocked isocyanate groups and having a cycloaliphatic polyisocyanate parent structure, and/or a polyisocyanate derived therefrom, (B2) at least one polyisocyanate-group-containing compound (B2) having free or blocked isocyanate groups and having an acyclic, aliphatic polyisocyanate parent structure, and/or a polyisocyanate derived therefrom, (D) at least one catalyst for the crosslinking of silane groups, and (R) at least one rheological assistant (R) based on fumed silica, where component (B1) and/or component (B2) comprise at least one structural unit
NR(XSiRx(OR)3-x)(I), and/or at least one structural unit
N(XSiRx(OR)3-x)n(XSiRy(OR)3-y)m(II).

The present invention relates to alkoxysilane-functionalized, allophanate-containing coating compositions, to a process for producing them, and to their use. In particular, the alkoxysilane-functionalized, allophanate-containing coating compositions include a) as a binder component, 10-99 wt % of at least one reaction product of i) at least one monourethane i) containing alkoxysilane groups and of the formula 1
R.sub.n(OR.sup.1).sub.3-nSiR.sup.2NH(CO)OR.sup.3formula 1
where R, R.sup.1, R.sup.2 and R.sup.3 are each independently hydrocarbyl radicals having 1-8 carbon atoms, which may be linear, branched or cyclic, or else may be integrated together to form a cyclic system, and n is 0-2, and ii) at least one diisocyanate ii), in a molar ratio of i) to ii) of from 3:1 to 1.5:1, preferably from 2.5:1 to 1.8:1, particularly preferably 2:1; b) 1-90 wt % of at least one other binder component, different from a), preferably a hydroxyl-containing or amino-containing binder component, c) 0-50 wt % of at least one aromatic, aliphatic or cycloaliphatic polyisocyanate having an NCO functionality of at least 2, preferably 2.8 to 6, d) 0-5 wt % of at least one catalyst, where components a)-d) add up to 100 wt %.

The present invention relates to alkoxysilane-functionalized allophanates, to methods for production thereof, and to the use thereof. In particular, the alkoxysilane-functionalized allophanate includes the reaction product of A) at least one alkoxysilane group-containing monourethane A) of the formula 1
R.sub.n(OR.sup.1).sub.3-nSiR.sup.2NH(CO)OR.sup.3formula 1,
where R, R.sup.1, R.sup.2 and R.sup.3 are each independently hydrocarbyl radicals having 1-8 carbon atoms, which may be linear, branched or cyclic, or else may be integrated together to form a cyclic system, and n is 0-2, and B) at least one diisocyanate B), in a molar ratio of A) to B) of 3:1 to 1.5:1.

The invention relates to two-component polyurethane dispersion adhesives including (I) at least one aqueous dispersion including an amorphous polyurethane-polyurea polymer and (II) at least one hydrophilically modified polyisocyanate, containing silane and thioallophanate structures, as a crosslinker component. The invention also relates to the use of these two-component polyurethane dispersion adhesives for producing multi-layered composites, especially those consisting of a synthetic substrate and a substrate with a metallic surface, and to the composite materials obtainable using the adhesives.

A hydrophilic polyisocyanate composition includes a polyisocyanate component A) and an emulsifier component B. The polyisocyanate component A) consists of at least one polyisocyanate, including silane and thioallophanate structures, of general formula (I), in which R1, R2 and R3 represent identical or different functional groups and each denote a saturated or unsaturated, linear or branched, aliphatic or cyclo-aliphatic or optionally substituted aromatic or araliphatic functional group having up to 18 carbon atoms, which functional group can optionally also contain up to 3 heteroatoms from the series oxygen, sulfur and nitrogen, X represents a linear or branched organic functional group having at least 2 carbon atoms, Y represents a linear or branched, aliphatic or cycloaliphatic, araliphatic or aromatic functional group having up to 18 carbon atoms, and n represents an integer from 1 to 20, and the emulsifier component B) contains at least one ionic and/or nonionic emulsifier.

The invention relates to nonaqueous coating compositions containing at least one thioallophanate with free or blocked isocyanate groups and with silane groups, at least one isocyanate-reactive compound, at least one catalyst for the crosslinking of the silane groups and at least one alkoxysilyl-functional and/or hydroxyl group-containing siloxane, to the use of these coating compositions for producing coatings and paint systems, more particularly for use in the transport sector, i.e. in vehicles, especially in ships, aircraft, motor vehicles such as cars, trucks, buses, large vehicles, rail vehicles, etc. The coating compositions are suitable in particular for producing clearcoats.

The invention relates to coating agents containing polyisocyanates that include amino silane groups and/or mercapto silane groups, further containing a stored mixture of hydroxyl group-containing compounds and alkoxysilyl-functional siloxanes, and catalysts for crosslinking silane groups. Also disclosed are the production of said coating agents and the use thereof for producing coatings on substrates, in particular plastic substrates, e.g. substrates used in the automobile industry.