Abstract: The use of phenylglyoxalic esters of the formula I in which the two radicals R1 and A are as defined in the description as photoinitiators in powder coating materials for exterior applications. The compounds of the formula I show little propensity toward yellowing.

Abstract: The present invention relates to an aqueous dispersion comprising a solid pulverulent component A and an aqueous component B, said component A comprising a UV-curable powder coating material.

Abstract: Compounds having alcoholic hydroxyl groups are esterified with acrylic or methacrylic acid in the presence of copper(II) salts or mixtures thereof as polymerization inhibitors and in the presence of a hydrocarbon as a water-entraining agent with removal of the water of reaction at from 90 to 150° C. After the esterification, the copper salt is precipitated as copper sulfide and is separated off from the ester. The light-color (meth)acrylates resulting in the high yields are particularly suitable for coatings containing colored pigment on substrates such as wood, paper, mineral building materials, plastics or metal.

Abstract: Polyisocyanates are prepared by a process which comprises (i) preparation of an addition product (A) which contains one group which is reactive toward isocyanate and one isocyanate group by reacting (a) a diisocyanate I with (b) compounds containing two groups which are reactive toward isocyanate, where at least one of the components (a) or (b) has functional groups having differing reactivities toward the functional groups of the other component, (ii) if desired, intermolecular addition reaction of the addition product (A) to form a polyaddition product (P) which contains one group which is reactive toward isocyanate and one isocyanate group and (iii) reaction of the addition product (A) and/or the polyaddition product (P) with a diisocyanate or polyisocyanate II which is different from diisocyanate I.

Abstract: The present invention relates to a process for preparing nondispersing (meth)acrylic esters containing urethane groups, comprising a) reacting at least one hydroxyl-containing compound with (meth)acrylic acid in a solvent, to form an ester; b) removing the solvent and optionally a part of unreacted (meth) acrylic acid; c) reacting the mixture resulting from stage a) or b) with at least one epoxy-functional compound in an amount corresponding to the acid number of the mixture; and d) reacting the mixture resulting from stage c) with at least one compound containing isocyanate groups, and such esters obtainable in this way, and radiation-curable coating compositions comprising said esters, and a process for preparing these coating compositions.

Abstract: Initiators for free-radical addition polymerization comprising as structural feature the Diels-Alder adduct of an azo group (—N═N—) with a conjugated double bond (diene).

Abstract: Radiation-curable formulations based on ethylenically unsaturated prepolymers and difunctional esters of ethylenically unsaturated carboxylic acids with diols having a linear alkylene chain of 7 to 14 carbon atoms, a process for coating substrates using these radiation-curable formulations, and their use as automotive topcoats.

Abstract: The invention relates to a curable polyurethane polymer which comprises in copolymerized form A) from 40 to 80% by weight, based on the overall weight of components A) to F), of at least one hydroxyl-containing prepolymer having at least one free-radically or photochemically polymerizable &agr;,&bgr;-ethylenically unsaturated double bond, B) from 0.1 to 20% by weight, based on the overall weight of components A) to F), of at least one compound having at least one isocyanate-reactive hydroxyl group and/or primary or Secondary amino group and, in addition, at least one polar functional group, C) from 0.

Abstract: A method of initiating free-radical addition polymerization, which entails effecting a free-radical addition polymerization in the presence of an initiator, which contains, as a structural feature, a Diels-Alder adduct of an azo group (—N═N—) with a conjugated double bond (diene).

Abstract: A process for preparing radiation-curable, urethane-functional prepolymers by reacting an isocyanate-functional component A with an OH-containing component B, wherein either component A embraces two different isocyanate compounds A1 or one isocyanate compound A1 and at least one isocyanate compound A2 or component B embraces at least two different compounds B1. Also, the prepolymers obtainable by the process and the radiation-curable formulations comprising them. Furthermore, the use of the radiation-curable formulations for coating substrates, a method of coating substrates, and the coated substrates themselves.

Abstract: Initiators for free-radical addition polymerization comprising as structural feature the Diels-Alder adduct of an azo group (—N═N—) with a conjugated double bond (diene).