摘要:
Aqueous coating compositions with a resin solids consisting of 60 to 80 wt. % of binder solids and 20 to 40 wt. % of cross-linker solids, the binder solids consisting of 20 to 100 wt. % of binder C and 0 to 80 wt. % of one or more further binders and the cross-linker solids consisting of 80 to 100 wt. % of one or more aminoplast resins and 0 to 20 wt. % of one or more further cross-linkers, the sum of the respective wt. % equalling 100 wt. % and the binder C being produced by reacting a polyisocyanate A partially blocked by one or more monoalcohols A2 and having a content of free isocyanate groups of 0.5 to 10 wt. % with a resin B comprising a hydroxyl number of 50 to 250 mg KOH/g and a carboxyl number of 10 to 50 mg KOH/g at a molar ratio of hydroxyl groups of B to free isocyanate groups of A of at least 2:1.
摘要:
Non-aqueous, liquid coating compositions which contain at least one hydroxyl-functional component A, at least one hydroxyl-functional polyurethane resin B differing from the at least one component A and at least one crosslinking agent C with groups reactive towards the hydroxyl groups of A and B, wherein the at least one component A is not solid at room temperature and/or is present in dissolved form and wherein the at least one polyurethane resin B is present as particles having a melting temperature of 40 to 180° C.
摘要:
A process for the production of a coating layer from a thermally curable coating composition on a substrate, comprising the successive steps: a) providing a substrate to be coated, b) applying a backing foil coated on one side with an uncured or at least only partially cured coating layer of a thermally curable coating composition, with its coated side on the entire surface or at least one sub-zone of the surface of the substrate, c) supplying thermal energy onto the entire coating applied in step b), and d) removing the backing foil from the coating which remains on the substrate; wherein the supply of thermal energy onto the coating proceeds prior to and/or after removal of the backing foil.
摘要:
The invention is directed to a process for multilayer coating of substrates which comprises a) applying a filler layer of a filler coating composition to a substrate, b) curing the resultant filler layer by irradiation with high energy radiation and c) applying a top coat layer to the cured filler layer and curing the top coat layer, whereby the filler coating composition comprises A) at least one binder capable of free-radical polymerization having fewer than three olefinic double bonds per molecule, B) at least one ester of alpha,beta-olefinically unsaturated monocarboxylic acids capable of free-radical polymerization having one olefinic double bond per molecule and C) at least one compound having at least one phosphoric acid group.
摘要:
The present invention provides a powder coating composition comprising A) 30 to 90 wt% of at least one glycidyl-functionalised (meth)acrylic resin, B) 30 to 90 wt% of at least one carboxyl functionalised polyurethane resin, C) 0.01 to 10 wt% of at least one wax, and D) 0.05 to 30 wt% of at least one coating additive, and optionally pigment and/or filler, the wt % based on the total weight of the powder coating composition; the powder coating composition provides coatings with a very low gloss level (highly matt finish) and smoothness, a superior durability against aggressive substances and a very good adhesion on metallic substrates.
摘要:
A solvent-based coating composition, used in automotive original and automotive refinish coating, comprising 10-90% by weight of at least one hydroxyl-functional (meth)acrylic copolymer A) having an OH value from 80 to 200 KOH/g and a weight average molecular weight Mw from 2,500 to 30,000 and 90-10 weight.-% of at least one cross-linking agent B), which is capable of entering into a cross-linking reaction with the OH-groups of components A), wherein the % by weight of component A) and B) add up to 100 weight.-%, wherein the hydroxyl-functional (meth)acrylic copolymer A) is obtained by reacting a group of components, comprising a) 15-50% by weight of at least one hydroxy functional free-radically copolymerizable olefinically unsaturated monomer, b) 30-80% by weight of at least one non-hydroxy functional polymerisable unsaturated monomer and 5-40% by weight of at least one lactone compound, and wherein the hydroxy-functional (meth)acrylic copolymer A) is prepared by reacting monomers a), b) and c) in a skew feed polymerization process, with at least two feed streams.
摘要:
A process for the production of a coating layer from a coating composition curable with high-energy radiation on a substrate, comprising the successive steps: a) providing a substrate to be coated, b) applying a backing foil coated on one side with an uncured or at least only partially cured coating layer of a coating composition curable by means of high-energy radiation, with its coated side on the entire surface or at least one sub-zone of the surface of the substrate, c) irradiating the entire coating applied in step b) with high-energy radiation, and d) removing the backing foil from the coating which remains on the substrate; wherein irradiation of the coating proceeds through the backing foil and/or after removal of the backing foil.
摘要:
A process for the production of a clear top coat layer on automotive bodies comprises the following steps: a) spray application onto at least portions of the precoated surface of the automotive bodies, that are not directly accessible to an external observer but are in principle accessible to spray coating, of a clear coat layer from a clear coating composition A curable by free-radical polymerization of olefinic double bonds on exposure to UV radiation, b) spray application onto the outer surface, finished in color-determining manner, of the automotive bodies, which surface is directly accessible to an external observer and to spray coating, of a clear coat layer from a clear coating composition B curable by free-radical polymerization of olefinic double bonds on exposure to UV radiation, and c) curing of the clear coat layers by UV radiation-induced, free-radical polymerization of olefinic double bonds, wherein the clear coating compositions A and B, differ from one another (1) by having a higher content of photoinitiator(s) or (2) by having a lower content of light stabilizer(s) and/or UV absorber(s) or (3) by having a lower content of light stabilizer(s) and/or UV absorber(s) with compositions A and B having a different content of photoinitiator(s).
摘要:
Dual cure coating composition comprising resin solids, said resin solids being composed of (a) 30 to 90 wt. % of at least one hydroxy-functional polyester urethane having olefinic double bonds, (b) 0 to 60 wt. % of at least one binder other than the polyester urethane (a) and/or at least one reactive diluent, and (c) 10 to 50 wt. % of at least one cross-linking agent for hydroxy-functional components (a) and optionally (b), wherein the at least one polyester urethane (a) has a number average molecular mass of 1000 to 5000 and a hydroxyl value of 80 to 250 mg KOH/g, contains olefinic double bonds corresponding to an olefinic double bond equivalent weight of 250 to 2000 and is obtainable by the reaction, which proceeds with consumption of all isocyanate groups, of a component (a1) containing at least one isocyanate group and at least one olefinic double bond with a non-aromatic polyester polyol (a2) having a calculated molecular mass of 600 to 1400, an acid value of 0 to 30 mg KOH/g and a hydroxyl value of 250 to 600 mg KOH/g at a calculated hydroxyl functionality of 4.5 to 10, and wherein the sum of weight percentages of components (a) to (c) is 100 wt. %.
摘要:
The invention relates to a process for repairing coated substrate surfaces comprising the following successive steps: a) optionally preparing a blemished area to be repaired, b) providing a backing film coated on one side with an uncured or at least partially cured coating layer of a coating composition curable by means of high energy radiation, c) applying the backing film with its coated side onto the blemished area to be repaired, d) irradiating the coating applied in this manner onto the blemished area to be repaired with high energy radiation and e) removing the backing film, wherein the coating is irradiated through the backing film and/or after removing the backing film.