摘要:
An aqueous coating composition, comprisingA) at least one water-dilutable hydroxy-functional binder andB) at least one polyisocyanate crosslinking agent with free isocyanate groups,wherein component A) comprises A1) 40-95 wt. % of at least one water-dilutable hydroxy-functional (meth)acrylic copolymer with a hydroxyl value of 60-250 mg of KOH/g and an acid value of 5-50 mg of KOH/g, which is obtained by free-radical copolymerization performed in a non-aqueous phase, wherein the ratio of primary hydroxyl groups to secondary hydroxyl groups in the (meth)acrylate copolymer A1) is 1:0.1 to 1:1.2 and at least 80% of the secondary hydroxyl groups result from reaction products of a monoepoxy ester and an unsaturated acid-functional monomer, and A2) 5-60 wt. % of at least one water-dilutable polyester oligomer, wherein the total of the weight percentages of component A1) and A2) add up to 100 wt. % and wherein the free-radical polymerization for the production of component A1) is performed at least in part in the presence of component A2) and/or wherein component A2) is added during polymerization or after completion of polymerization.
摘要:
An aqueous coating composition, comprising A) at least one water-dilutable hydroxy-functional binder and B) at least one polyisocyanate crosslinking agent with free isocyanate groups, wherein component A) comprises A1) 40-95 wt. % of at least one water-dilutable hydroxy-functional (meth)acrylic copolymer with a hydroxyl value of 60-250 mg of KOH/g and an acid value of 5-50 mg of KOH/g, which is obtained by free-radical copolymerization performed in a non-aqueous phase, wherein the ratio of primary hydroxyl groups to secondary hydroxyl groups in the (meth)acrylate copolymer A1) is 1:0.1 to 1:1.2 and at least 80% of the secondary hydroxyl groups result from reaction products of a monoepoxy ester and an unsaturated acid-functional monomer, and A2) 5-60 wt. % of at least one water-dilutable polyester oligomer, wherein the total of the weight percentages of component A1) and A2) add up to 100 wt. % and wherein the free-radical polymerization for the production of component A1) is performed at least in part in the presence of component A2) and/or wherein component A2) is added during polymerization or after completion of polymerization.
摘要:
Oligoester acrylate resins having a high content of solids and comparatively low viscosity, and aqueous coating agents with a low content of organic solvents for obtaining coatings with high resistance to chemicals, more particularly high resistance to acids and oily soot, and very low tendency to yellowing.
摘要:
A coating medium suitable for multilayer coatings, containing, as a binder vehicle:______________________________________ A) 10 to 90% by weight of one or more hydroxy-functional (meth)acrylic copolymers, obtained from a1) 20 to 40% by weight of hydroxyalkyl esters of (meth)acrylic acid a2) 10 to 30% by weight of non-functionalised (meth) acrylates a3) 0 to 5% by weight of unsaturated carboyxlic acids a4) 10 to 60% by weight of non-functionalised monomers a5) 0 to 15% by weight of amino-functional monomers, and a6) 0 to 5% by weight of multiply-unsaturated monomers B) 90 to 10% by weight of hydroxy-functional polyesters, C) 0 to 40% by weight of hydroxy-functional binder vehicles D) 5 to 50% by weight of blocked polyisocyanates, E) 5 to 40% by weight of components based on triazine which crosslink with the hydroxyl groups of components A), B) and C) with the formation of ether and/or ester groups, ______________________________________ wherein at least 50% by weight of the (meth)acrylic copolymers, with respect to the total amount of component A), has been produced in the presence of the hydroxy-functional polyesters corresponding to at least 20% by weight of the total amount of component B).
摘要:
Binder composition, coating compositions produced therefrom and use thereof, in particular for multi-layer lacquer coatings. The binder composition contains: A) 25 to 75 wt. % of the reaction product of one or more carboxy-functionalised (meth) acrylic copolymers containing urethane groups and/or of one or more carboxy-functionalised polyesters containing urethane groups, each having an acid value of 30 to 200 mg of KOH/g, with one or more lactones, B) 25 to 75 wt. % of one or more epoxy-functionalised crosslinking agents having at least two epoxy functions per molecule with a number average molecular weight (Mn) of 200 to 10000 g/mol, C) 0 to 60 wt. % of one or more polyols having at least two hydroxyl functions per molecule, D.sub.1) 0 to 20 wt. % of one or more melamine resins, D.sub.2) 0 to 40 wt. % of one or more free or capped polyisocyanates, wherein the sum of the weight percentages of components A), B), C), D.sub.1) and D.sub.2) amounts to 100 wt. %, together with E) 0 to 10 wt. % of one or more catalysts to catalyse the reaction of carboxyl and epoxy groups, relative to the sum of weights of components A) to D.sub.2).
摘要:
This invention relates to non-ionic emulsifiers based on fatty acid esters of polyalkoxylated polyhydric alcohols as fundamental constituents. At least two fundamental constituents are linked to each other by the reaction of hydroxyl groups with a polyisocyanate, with the formation of urethane bonds.
摘要:
Coating composition suitable for multi-layer lacquerings, with a binder composition which comprises: A) 25 to 75 wt. % of carboxyl-functional (meth)acrylic copolymers and/or carboxyl-functional polyesters, the carboxyl functionality of which corresponds to an acid number of 15 to 300 mg KOH/g, B) 25 to 75 wt. % of epoxide-functionalized crosslinker resins, at least one of which is a (meth)acrylic copolymer which has been prepared co-using tert-butyl (meth)acrylate, C) 0 to 50 wt. % of polyols which have at least two hydroxyl functions in the molecule, D) 0 to 40 wt. % of components which crosslink with hydroxyl groups to form ethers, and/or of a crosslinking agent based on triazine, E) 0 to 40 wt. % of polyisocyanates, F) 0 to 50 wt. % of at least one organic polyanhydride with at least two cyclic carboxylic acid anhydride groups per molecule, G) 0 to 20 wt. % of reactive thinners with an epoxide function, H) 0 to 10 wt. % of one or more catalysts for the reaction of carboxyl and epoxide groups.
摘要:
A binder composition, a coating composition containing this binder, a process for its production and use to produce single or multi-layer lacquer coatings, particularly in the automotive sector, are described. The binder composition contains A) 25 to 75 wt. % of the reaction product of one or more carboxy-functionalised poly(meth)acrylic copolymers and/or one or more carboxy-functionalised polyesters, each with an acid value of 15 to 200 mg KOH/g, with one or more lactones, B) 25 to 75 wt. % of one or more epoxy-functionalised crosslinking agents with at least two epoxy functional groups per molecule, with a number average molecular weight (Mn) of 200 to 10000 g/mol, C) 0 to 60 wt. % of one or more polyols with at least two hydroxyl functional groups per molecule, D.sub.1) 0 to 20 wt. % of one or more melamine resins, D.sub.2) 0 to 40 wt. % of one or more capped polyisocyanates, wherein the sum of the weight percentages of components A), B), C), D.sub.1) and D.sub.2) is 100 wt. %, together with E) 0 to 10 wt. % of one or more catalysts to catalyse the reaction of the carboxyl and epoxy groups, related to the sum of the weights of components A) to D.sub.2).
摘要:
A coating material is described which exhibits high resistance to chemicals and is emulsifier-free. The coating material is useful as a lacquer layer coating on metallic substates such as automobiles. The coating material is based upon a polyester oligomer/polyacrylate wherein the polyacrylate contains hydrophilic and hydrophobic portions and the polyester contains hydroxyl functions. Capped polyisocyanates are also included in the coating material.
摘要:
Two-component coating compositions include: A) a cross-linkable binder compound having at least one functional group reactive towards isocyanate groups, B) a cross-linking agent having at least one free isocyanate group and C) a catalyst component comprising C1) a catalyst for the for the curing reaction between the functional groups of component A) and the isocyanate groups of component B), the catalyst C1) being an organo-metal compound, and C2) an oligomeric or polymeric binder compound having a glass transition temperature Tg of ≧about 20° C., measured by DSC (differential scanning calorimetry) at a heating rate of 10 K/min. The glass transition temperature Tg of the binder compound C2) is above the temperature at which the two-component coating composition is applied, preferably about 10° C. above the temperature at which the two-component coating composition is applied.