The present invention relates to a selective process for producing polyurethane prepolymers, to the polyurethane prepolymers obtainable from this process, and also to a process for producing moisture-crosslinking silylated polymers, more particularly silane-functional hybrid polymers, and also to the use thereof in CASE sectors (coatings, adhesives, sealants and elastomers).

Silicone polyurea block copolymers are prepared by copolymerizing: (a) a diamine composition that includes a polyethylene glycol diamine, and optionally, a dipiperidyl alkane; (b) a monofunctional silicone isocyanate; and (c) a diisocyanate. Compositions useful as passivating coatings comprising the block copolymer are also provided, and substrates coated with the compositions. Methods of preparing and using the compositions are also described.

The invention relates to a method for preparing polyurethanes containing alkoxysilane groups, said method comprising the step of reacting a compound containing at least one NCO group with a compound containing at least one Zerewitinoff-active H atom in the presence of a catalyst component, the at least one compound containing an NCO group and/or the compound containing at least one Zerewitinoff-active H atom containing at least one alkoxysilane group, so as to obtain a polyurethane containing alkoxysilane groups. The invention also relates to a polymer containing alkoxysilane groups, a method for preparing a curable polymer, a curable polymer, a cured polymer, and use thereof. The polyurethanes are prepared with use of a thermally labile tin catalyst.

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).

A moisture-curing adhesive composition has a) at least one polyurethane polymer having isocyanate groups, b) at least a silane adhesion promoter, c) at least one amine catalyst, and d) at least one chelate complexing agent. Compositions are suitable especially as adhesive or sealant, in particular for glass panes, for example in vehicle construction or vehicle repair, wherein the use of a primer or activator can be dispensed with.

The present invention relates to a coating material comprising at least one aliphatic or cycloaliphatic polyisocyanate having an NCO functionality of at least 2, preferably 2.8 to 6, optionally at least one binder, preferably a hydroxyl-containing binder, at least one adduct of an isocyanatotrialkoxysilane and a polyhydric alcohol, with more than 90, more preferably more than 95, most preferably more than 99 percent of the hydroxyl groups in the polyhydric alcohol having been converted by reaction with the isocyanatotrialkoxysilane, and less than 0.1 wt % of the isocyanate groups from the isocyanatotrialkoxysilane being reactive in the adduct, at least one catalyst selected from the group consisting of Lewis acids, phosphoric acid or phosphorous acid and esters thereof, blocked or non-blocked sulphonic acids, sulphuric acid, carboxylic acids having a melting point >60° C. and tetraalkylammonium carboxylates, optionally at least one auxiliary, preferably at least one further crosslinker, and/or adjuvant, and optionally organic solvents, and also to a process comprising providing, applying to a surface and curing the coating material, to a coating obtainable by curing the coating material, and to use of the coating material for coating a metal, glass, plastic or wood surface.

The invention relates to a composition and to a process for preparing moisture-crosslinking polymers under catalysis by at least one metal-siloxane-silanol(ate) compound, and to the use of the composition in the CASE sector (coatings, adhesives, sealants and elastomers), especially in the field of adhesives and sealants.

The present invention relates to a 2-component system containing at least one specific N-, S-, O- and Si-containing compound. The invention further relates to a process for preparing silicon-containing polyurethanes, comprising reacting the first component with the second component of the 2-component system according to the present invention, and to the silicon-containing polyurethanes obtained therefrom. In addition, the invention relates to the use of the 2-component system according to the present invention for the production of coating, sealants or adhesives.

The present invention relates to a selective process for the preparation of NCO-functionalized polyols, to their use in the preparation of silylated polyurethanes, to processes for preparing silylated polyurethanes and to silylated polyurethanes obtainable by a reaction of NCO-functionalized polyol with amino silane and to their use in CASE applications (coatings, adhesives, sealants and elastomers).