Abstract: The invention relates to a process for preparing ytterbium(III) ?-diketonates, especially ytterbium(III) acetylacetonate, to the ytterbium(III) ?-diketonates prepared by this process and to the use thereof as catalysts.

Abstract: The present invention relates to a process for preparing aliphatic oligocarbonate polyols having secondary OH groups and number-average molecular weights ?500 g/mol, by A) initially reacting excess amounts of organic carbonates with polyols which have exclusively primary OH groups via a transesterification reaction to prepare an intermediate polymer having an average concentration of OH groups of ?0.3 mol %, based on 1 mol of the intermediate polymer, B) removing the cleavage products formed simultaneously with the transesterification reaction or subsequently together with excess unconverted carbonate, and, in a further step, C) reacting the intermediate polymer with aliphatic polyols which each have at least one secondary OH group per molecule to obtain aliphatic oligocarbonate polyols having an average of ?5 mol % of secondary OH groups, based on the total of all the OH groups present.

Abstract: The present invention relates to aliphatic oligocarbonate polyols prepared by the transesterification of organic carbonates with aliphatic polyols in the presence of at least one catalyst which contains i) at least one rare earth metal or compounds thereof or ii) at least one metal of group III B of the periodic table of the elements or compounds thereof or iii) mixtures of i) and ii) and to a process for preparing the same.

Abstract: The invention relates to a plastic article with a coating containing at least one zinc oxide-containing layer and at least one abrasion-resistant outer layer.

Abstract: The present invention relates to an improved process for preparing aliphatic oligocarbonate polyols by transesterifying dimethyl carbonate (DMC) with an aliphatic polyol component.

Abstract: The present invention relates to an improved process for preparing aliphatic oligocarbonate diols by transesterifying dimethyl carbonate (DMC) with aliphatic diols.

Abstract: The present invention relates to solvent-free, NCO prepolymers having a residual IPDI monomer content of less than 2.0 wt. %, an NCO content of 2.0 to 5.0 wt. % and a viscosity of 5000 to 20,000 mPa·s, wherein the NCO prepolymers are the reaction products of i) 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate and ii) one or more polyethers prepared by the DMC catalyst process and having an OH-functionality of 1.80 to 2.00 at an NCO/OH equivalent ratio of 1.5:1 to 2.2:1. The present invention also relates to a process for preparing these solvent-free, NCO prepolymers and to polyurethane coating, sealant, adhesive and/or embedding compositions containing the solvent-free, NCO prepolymers as a binder and/or binder component.

Abstract: Ytterbium(III) acetylacetonate is used as a catalyst for the preparation of aliphatic oligocarbonate polyols by transesterification of at least one organic carbonate with at least one aliphatic polyol.

Abstract: The invention relates to a primer containing a solvent-containing two-component polyurethane binder comprising I) a curing component (A), comprising an addition product of at least one organic polyisocyanate (B) with an average NCO functionality of 2.5 to 5.0 and an isocyanate content of 8 to 27 wt. % and an alkoxysilane (C) of formula (I) with at least one isocyanate-reactive group, Q—Z—SiXaY3−a  (I), in which Q represents an isocyanate-reactive group, Z represents a linear or branched C1-C12 alkylene group, X represents a hydrolyzable group, Y represents identical or different C1-C4 alkyl groups and a is an integer from 1 to 3, and II) a lacquer resin (D) which can react with isocyanate groups as adhesion promoter.

Abstract: The invention relates to a process for the preparation of nano-zinc oxide dispersions stabilized by hydroxyl group-containing inorganic polymers.

Abstract: The invention relates to a process for the preparation of nano-zinc oxide dispersions stabilized by hydroxyl group-containing inorganic polymers.

Abstract: The invention relates to a process for coating a substrate with a nitrogen-free compound corresponding to formula (I) and/or a hydrolysis product or condensation product [R1(R2)j]iSiR3k(OR4)4−k−i  (I), wherein i represents the number 1, 2 or 3, j represents an integer from 1 to 10, k represents the number 0, 1 or 2, k+i is ≦3, and R1 represents OH, OR, SH, SR, OOC—R, R represents C1-C10-alkyl or C6-C12-aryl, R2 is an unsubstituted, singly substituted, or doubly substituted methylene group, R3 is a substituted or unsubstituted C1-C10-alkyl or C6-C12-aryl group, R4 represents a C1-C10-alkyl or C6-C12-aryl group, and wherein if j represents from 2 to 10 the methylene groups in the chain may optionally be interrupted once or several times by hetero atoms.

Abstract: The present invention relates to mixtures prepared from (A) at least one linear, branched, or cyclic monomeric organosilane having at least two silicon atoms with hydrolyzable and/or condensation-crosslinking groups in which the silicon atoms are bonded to one another through at least one carbon atom in a linking unit, and (B) at least one boron- and/or aluminum-containing compound having the formula (I) RxM(OR′)3-x  (I)  wherein M is Al or B, x is 0, 1, or 2, R is C1-C6-alkyl, C6-C12-aryl, or (O)1/2, with the proviso that if R is (O)1/2, then the compound of the formula (I) is a chain when x is 1 and a cyclic or cage-form compound when x is 2, and each R′ is independently H, C1-C10-alkyl, or C6-C12-aryl. The invention further relates to hybrid materials prepared from such mixtures and to coatings produced therefrom.

Abstract: The present invention relates to aliphatic oligocarbonate polyols prepared by the transesterification of organic carbonates with aliphatic polyols in the presence of at least one catalyst which contains i) at least one rare earth metal or compounds thereof or ii) at least one metal of group III B of the periodic table of the elements or compounds thereof or iii) mixtures of i) and ii) and to a process for preparing the same.

Abstract: The present invention relates to solvent-free, NCO prepolymers having a residual IPDI monomer content of less than 2.0 wt. %, an NCO content of 2.0 to 5.0 wt.

Abstract: The invention relates to protective coverings with a coating build-up of at least two layers, the first coating comprising an adhesion promoter based on a two-component polyurethane binder containing alkoxysilyl groups and the second coating comprising an inorganic coating, a process for the production of these protective coverings and the covered substrates.

Abstract: The invention relates to a primer containing a solvent-containing two-component polyurethane binder comprising I) a curing component (A), comprising an addition product of at least one organic polyisocyanate (B) with an average NCO functionality of 2.5 to 5.0 and an isocyanate content of 8 to 27 wt.

Abstract: The present invention relates to mixtures prepared from

Abstract: The present invention relates to mixtures prepared from (A) at least one linear, branched, or cyclic monomeric organosilane having at least two silicon atoms with hydrolyzable and/or condensation-crosslinking groups in which the silicon atoms are bonded to one another through at least one carbon atom in a linking unit, and (B) at least one boron- and/or aluminum-containing compound having the formula (I) RxM(OR′)3−x  (I)  wherein M is Al or B, x is 0, 1, or 2, R is C1-C6-alkyl, C6-C12-aryl, or (O)½, with the proviso that if R is (O)½, then the compound of the formula (I) is a chain when x is 1 and a cyclic or cage-form compound when x is 2, and each R′ is independently H, C1-C10-alkyl, or C6-C12-aryl. The invention further relates to hybrid materials prepared from such mixtures and to coatings produced therefrom.

Abstract: The invention relates to a plastic article with a coating containing at least one zinc oxide-containing layer and at least one abrasion-resistant outer layer.