摘要:
The invention relates to a coating composition containingA) 50 to 90% by weight of one or more hydroxyl-containing addition polymers, prepared by copolymerization of ethylenically unsaturated monomers which are in part hydroxyalkyl esters of .alpha.,.beta.-ethylenically unsaturated carboxylic acids andB) 10 to 50% by weight of one or more amino resin crosslinking agentsthe sum of the proportions by weight of A and B being 100% by weight, and suitable auxiliaries and additives, optionally pigments, optionally fillers, organic solvent and an acid catalyst.The coating composition is one wherein the acid catalyst used comprises1) sulfo- or sulfonio[sic]-succinic esters which each contain at least one hydroxyl group and/or2) sulfo- or sulfonio[sic]-succinic polyesters which each contain at least one hydroxyl group.The invention furthermore relates to a process for the preparation of the coating compositions according to the invention and to their use as an automobile repair finish or as a stoving paint.
摘要:
The present invention relates to a coating composition comprising(A) at least one hydroxyl-containing component which [lacuna] of(A1) from 5 to 60% by weight of at least one polyester and(A2) from 40 to 95% by weight of at least one polyacrylate resin which has been prepared at least partially in the presence of component (A1) and(B) at least one crosslinking agent, characterized in that component (A2) is obtainable from the monomer units:(a) a cycloaliphatic ester of (meth)acrylic acid,(b) a hydroxyl-containing alkyl ester of (meth)acrylic acid,(c) a monomer which is different from (a) and (b) and has at least two polymerizable, olefinically unsaturated double bonds,(d) optionally a further hydroxyl-containing, ethylenically unsaturated monomer which is different from (a), (b) and (c),(e) an aliphatic ester of (meth)acrylic acid which is different from (a), (b), (c) and (d),(f) a vinyl-aromatic hydrocarbon which is different from (a), (b), (c), (d) and (e), and(g) a further ethylenically unsaturated monomer which is different from (a), (b), (c), (d), (e) and (f).
摘要:
The invention relates to copolymers containing on average 1.25 to 30 functional groups per molecule and a number average molecular weight of 1500 to 6000, which copolymers can be prepared by free-radical solution polymerization at 130.degree. to 200.degree. C. from 5 to 25% by weight of vinyl ester, 10 to 50% by weight of vinyl aromatic, 10 to 40% by weight of functional, monomers and, if desired further monomers, in which the vinyl ester is initially introduced and the remaining monomers are metered in for all monomers over a monomer addition period which is of the same length in the following manner: The amount of acrylate monomers added per unit of time remains constant. The amount of vinyl aromatic added over the first third of the monomer addition period is 15 to 30% by weight, the amount added over the second third is 25 to 40% by weight, and the amount added over the last third is 35 to 60% by weight, each relative to the total amount of vinyl aromatic. The copolymer obtained is, if desired, reacted with compounds containing a group which is reactive towards the functional groups of the copolymer and at least one crosslinkable group.
摘要:
Disclosed herein is a powder coating suspension prepared in the presence of an emulsifier (A) by emulsifying a liquid component (B) in an aqueous medium (C) to give an aqueous emulsion of liquid particles (D); and cooling the emulsion of liquid particles (D); wherein the emulsifier (A) has a hydroxyl number of 50 to 250 mg KOH/g and is a copolymer prepared by copolymerizing in an aqueous medium (a1) a hydroxyl-containing, olefinically unsaturated monomer; and (a2) an olefinically unsaturated monomer selected from the group consisting of (a21) a monomer of the general formula R1R2C═CR3R4, wherein R1, R2, R3, and R4 are independently hydrogen atoms or substituted or unsubstituted alkyl, cycloalkyl, alkylcycloalkyl, cycloalkylalkyl, aryl, alkylaryl, cycloalkylaryl, arylalkyl or arylcycloalkyl radicals, with the proviso that at least two of R1, R2, R3, and R4 are aryl, arylalkyl or arylcycloalkyl radicals; (a22) an olefinically unsaturated terpene hydrocarbon; and (a23) a dimeric alpha-alkylvinylaromatic.
摘要翻译:本文公开了通过在水性介质(C)中乳化液体组分(B)而在乳化剂(A)存在下制备的粉末涂料悬浮液,得到液体颗粒(D)的水性乳液; 并冷却液体颗粒(D)的乳液; 其中所述乳化剂(A)的羟值为50-250mgKOH / g,并且是通过在水性介质(a1)中共聚含羟基的烯属不饱和单体制备的共聚物; 和(a2)选自(a21)通式为R 1 R 2 C = CR 3 R 4的单体的烯属不饱和单体,其中R 1,R 2,R 3和R 4独立地为氢原子或取代或未取代的烷基,环烷基,烷基环烷基, 环烷基烷基,芳基,烷基芳基,环烷基芳基,芳基烷基或芳基环烷基,条件是R 1,R 2,R 3和R 4中的至少两个是芳基,芳基烷基或芳基环烷基; (a22)烯属不饱和萜烯烃; 和(a23)二聚α-烷基乙烯基芳族化合物。
摘要:
A process and means for producing powder coating materials. A polyaddition resin is prepared in a Taylor reactor at temperatures above the melting temperature of the polyaddition resin. The polyaddition resin melt prepared in a Taylor Reactor is supplied to a homogenizing means and crosslinker is added to the homogenizing means to prepare a components melt, followed by cooling the components melt on a cooling means for solidification to the end product and supplying the end product to a pulverizing means.
摘要:
Disclosed herein is a powder coating suspension prepared by a method comprising (1) emulsifying a liquid component comprising a liquid starting product in an aqueous medium in the presence of an emulsifier whose aqueous solution at the critical micelle concentration (CMC) has a surface tension >30 mN/m to give an aqueous emulsion of liquid particles and (2) cooling the emulsion so that a suspension of dimensionally stable particles is formed. Also disclosed are a process for preparing a powder coating suspension and a process for preparing a powder coating material.
摘要:
Powder coating materials which comprise high-functionality, highly branched or hyperbranched polycarbonates based on dialkyl or diaryl carbonates or on phosgene, diphosgene or triphosgene and on aliphatic, aliphatic/aromatic or aromatic diols or polyols.
摘要:
A Taylor reactor (1) according to FIG. 1, comprising 1. an annular reaction volume (2) which widens in the flow direction and is defined by an outer reactor wall (3), a rotor (4) which is mounted rotatably at the end (4.1) in the reactor floor (5) and at its other end (4.2) is unmounted, and a reactor floor (5) having a seal (6) for the drive shaft (7), 2. an inlet region (8) above the reactor floor (5), having at least one side feed (8.1) and/or at least one feed (8.1) through the reactor floor (5) for the reactants and/or the process media, 3. an outlet region (9) which is disposed above the annular reaction volume (2), widens further beyond the annular reaction volume (2) in the flow direction, and subsequently tapers toward a product offtake (10), 4. a product offtake (10) which at its greatest diameter opens toward the outlet region (9) and tapers in the other direction, and 5. a pressure maintenance valve (11); and its use for continuous bulk polymerization.
摘要:
The invention relates to polycondensation resins which are prepared by polycondensation of compounds having a low molecular weight and separation of small molecules in the presence of at least one hetergeneous catalyst. The invention also relates to polyaddition resins which are prepared by polyaddition in the presence of at least one heterogeneous catalyst. The invention further relates to the use of said polycondensation resins and polyaddition resins for the preparation of moulded parts, adhesives and coating materials.
摘要:
The present invention relates to a coating composition comprising at least one hydroxyl-containing polyacrylate resin as binder component (A) and at least one crosslinking agent (B),component (A) being obtainable by free-radical polymerization of:(a) from 5 to 80% by weight of at least one cycloaliphatic ester of (meth)acrylic acid,(b) from 10 to 50% by weight of at least one hydroxyl-containing alkyl ester of (meth)acrylic acid,(c) from 1 to 25% by weight of at least one monomer having at least two polymerizable, olefinically unsaturated double bonds,(d) from 0 to 25% by weight of at least one further hydroxyl-containing monomer,(e) from 5 to 80% by weight of at least one aliphatic ester of (meth)acrylic acid,(f) from 0 to 40% by weight of at least one vinyl-aromatic compound, and(g) from 0 to 40% by weight of at least one further monomer,the sum of the proportions by weight of all monomers (a) to (g) always being 100% by weight.The invention additionally embraces a process for producing a multicoat paint system using the novel coating composition and the use of the novel coating composition as topcoat, especially in automotive refinishing.