The present invention relates to alkoxysilane-functionalized and allophanate-functionalized urethanes, methods for the preparation thereof, coating compositions comprising these and to the use thereof.

An alkoxysilane-functionalized and allophanate-functionalized coating material including a) a binder component of 10-99 wt % of at least one reaction product of I. and II. wherein I includes A) at least one alkoxysilane-containing monourethane A) of the formula 1 R.sub.n(OR.sub.1).sub.3-nSi—R.sup.2—NH—(C═O)—OR.sup.3 wherein R, R.sup.1, R.sup.2 and R.sup.3 represent hydrocarbon radicals having 1-8 carbon atoms, and n represents 0-2, and B) at least one diisocyanate B), and II includes the subsequent reaction of C) with at least one diol and/or polyol C), in a ratio of NCO groups of reaction product I to OH groups of the diol and/or polyol II. C) of 1.0:1.5 to 1.0:0.6; b) 1-90 wt % of at least one further binder component distinct from a) a hydroxyl-containing or amino-containing binder component, c) 0-50 wt % of at least one polyisocyanate having an NCO functionality of at least 2, d) 0-5 wt % of at least one catalyst, wherein 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-nSi—R.sup.2—NH—(C═O)—OR.sup.3   formula 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.

Specific hydroxysilanes of formula (I), a method for the production thereof, the use thereof as a constituent of moisture-curing compositions, and silane-functional compounds produced therefrom, in particular silane-functional polymers and isocyanatosilanes. The hydrosilanes can be produced in a simple process with a high degree of purity and are storage-stable after production. Production from the reaction of lactides with aminosilanes is particularly advantageous. Hydroxysilane of formula (I), where n is 1 or 2.

A nonaqueous coating material composition and a coating produced from the coating material composition are provided. The coating material composition contains at least one polyhydroxyl group-containing component, at least one polyisocyanate group-containing component, at least one catalyst, and at least one urethane additive (PF) which has specific groups. The urethane additive (PF) is prepared by reacting 0.5 to 20 mol % of the isocyanate groups originally present in a polyisocyanate (PI) with a component (Ia) and 10 to 99.5 mol % of the isocyanate groups originally present in the polyisocyanate (PI) with a component (IIa). The component (Ia) contains at least one perfluoroalkyl group of a specific formula and one group reactive toward the isocyanate groups. The component (IIa) contains at least one silane group of a specific formula and one group reactive toward the isocyanate groups.

The present invention relates to nonaqueous coating material compositions comprising (A) at least one polyhydroxyl group-containing component (A), (B1) at least one isocyanate and silane group-containing component (B1), and (D) at least one catalyst (D) for the crosslinking of silane groups,
which composition comprises (B2) at least one isocyanate group-containing component (B2) which is different from component (B1) and which additionally has at least one perfluoroalkyl group of the formula (I)

CR.sup.1.sub.3—(CR.sup.2.sub.2).sub.f—  (I) where R.sup.1 and R.sup.2 independently of one another are H, F and/or CF.sub.3, but R.sup.1 and R.sup.2 may not both be H, and f is 1 to 20, preferably 3 to 11, more preferably 5 to 7.

A further subject of the present invention are the coatings produced from these coating material compositions, and also their use.

The invention relates to polymers containing silane groups, to a method for their production and to their use as a component of curable compositions, in particular of moisture-curing sealants, adhesives or coatings that can be applied at ambient temperature, or of hot-melt adhesives containing silane groups. The polymers containing silane groups are obtained in particular by means of a special hydroxysilane which can be produced in particular from the reaction of lactides with aminosilanes.

Disclosed are aqueous coating compositions comprising at least one hydroxyl-containing compound (A), at least one compound (B) having isocyanate groups and also having hydrolyzable silane groups, and at least one catalyst (C) wherein the compound (B) has 10 mol % to less than 90 mol % of at least one structural unit (I)
—N(X—SiR″x(OR′)3-x)n(X′—SiR″y(OR′)3-y)m  (I)
Where R′=hydrogen, alkyl or cycloalkyl, X, X′=linear and/or branched alkylene or cycloalkylene radical having 1 to 20 carbon atoms, R″=alkyl, cycloalkyl, aryl or aralkyl, n=0 to 2, m=0 to 2, m+n=2, and x, y=0 to 2, and more than 10 to 90 mol % of at least one structural unit (II) —Z—(X—SiR″x(OR′)3-x) (II), where Z=—NH—, —NR—, —O— or —S—, where R=alkyl, cycloalkyl, aryl or aralkyl, and x, X, R′ and R″ have the definition indicated for formula (I).

The present technology provides a curable resin composition that contains a urethane prepolymer having an isocyanate group, a coated amine formed by using a filler to coat solid amine having a melting point of 50° C. or higher, an isocyanate group-containing compound having an isocyanate group bonded to an aliphatic hydrocarbon group and having a hydrolyzable silyl group or (meth)acryloyl group, and a tertiary amine compound.

Disclosed is an adhesive agent set composed of a main agent and a hardening agent, in which the main agent contains a urethane prepolymer having isocyanate groups as terminal groups; and an oligomer of hexamethylene diisocyanate having an isocyanate group modified with a silane coupling agent having a mercapto group or an amino group, the oligomer also having at least two unmodified isocyanate groups, and the hardening agent contains a polyol.