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:
The invention concerns a binder suitable for clear or pigmented coating agents. Binders based on copolymers containing hydroxyl groups have hitherto a high solvent content. The solids content of the new binders is improved without affecting the viscosity; gloss, body, flow and processing properties of coatings containing the new binders are improved. The binders consist essentially of a copolymer containing hydroxyl groups, made from specific quantities of styrol, tertbutacrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, 2-hydroxypropyl methacrylate, butanediol-1, 4-monoacrylate, acrylic acid and glycidyl esters of .alpha.-alkylalkane monocarboxylic acids and/or .alpha.,.alpha.-dialkylalkane monocarboxylic acids.
摘要:
Coating agents are described, that are suitable for the production of pigmented or transparent top coatings, based on hydroxy-functional (meth)acrylic copolymers, aliphatic and/or cycloaliphatic polyisocyanates, solvents, and customary lacquer additives and pigments. They are free from epoxy resins and nitrocellulose and contain as binder A) one or more (meth)acrylic copolymers, containing hydroxyl groups, from a1) 47-53 wt % of one or more aromatic vinyl compounds, a2) 28-33 wt % of one or more hydroxyalkyl methacrylates, a3) 14-19 wt % of one or more alkyl (meth)acrylates, and a4) 0.5-2 wt % acrylic acid and/or methacrylic acid, with a hydroxyl number of 120-160 mg KOH/g, an acid number of 5 to 15 mg KOH/g, a weight-average molecular weight of 10,000 to 20,000 and a glass transition temperature of +40.degree. C. to +60.degree. C., and B) an aliphatic and/or cycloaliphatic polyisocyanate or a mixture of such polyisocyanates in such an amount that 0.5 to 2.0 isocyanate groups are present for one hydroxyl group of component A).
摘要:
Previous two-component coatings with enamine components cured very slowly at low temperatures and led to yellowed products. A binder composition is prepared which cures rapidly at low temperatures and leads to non-yellowing products. It contains as CH-acid component a polymer with at least two enamine functions in the molecule, obtained byA) transesterification of a .beta.-keto-ester with hydroxyl-group-containing compounds or polymers which contain at least two hydroxyl groups in the molecule, with an OH value of at least 50 and a number-average molecular weight of 500 to 10,000, followed by reaction with ammonia or primary and/or secondary amines, andB) as .alpha.,.beta.-unsaturated component a compound with at least two groups of the general formula R.sub.1 R.sub.2 C.dbd.CR.sub.3 --X; in which X signifies --CO-- which is bonded via the residue of a di- or polyhydric alcohol, a di- or polyamine or an aminoalcohol to a further R.sub.1 R.sub.2 C.dbd.CR.sub.3 --X group, where R.sub.1, R.sub.2 and R.sub.3 signify hydrogen or an alkyl group, components A) and B) are present in the ratio 2:1 to 1:1.5 relative to their equivalent weights, the composition exists as a two-component system, and component A) contains a Lewis or Bronsted base as catalyst.
摘要翻译:以前的双组分涂料,烯胺组分在低温下非常缓慢地固化并导致黄色产品。 制备粘合剂组合物,其在低温下快速固化并导致非黄变产物。 它包含作为CH酸组分的分子中具有至少两个烯胺功能的聚合物,其通过以下方式获得:A)β-酮酯与含有羟基的化合物或在分子中含有至少两个羟基的聚合物的酯交换 OH值至少为50,数均分子量为500至10,000,随后与氨或伯胺和/或仲胺反应,B)作为α,β-不饱和组分,具有至少两个 通式为R1R2C = CR3-X的基团; 其中X表示-CO-,其通过二元或多元醇,二胺或多胺或氨基醇的残基与另外的R 1 R 2 C = CR 3 -X基团结合,其中R 1,R 2和R 3表示氢或烷基 组分A)和B)相对于其当量的比例为2:1至1:1.5,组合物以双组分体系存在,组分A)含有路易斯或布朗斯台德碱作为催化剂。
摘要:
A binding-agent composition for solvent-based or aqueous coating agents can be cured at low temperature to produce coatings which are non-yellowing and resistant to solvents. The binding-agent composition contains binding-agent components based on polyethers, polyesters, polyether polyesters and/or (meth)acrylic copolymers with, in each case, at least one acryloyl group and at least one epoxide group in the molecule, whereby the acryloyl groups and epoxide groups are present in the ratio 2:8 to 8:2. Also included are several polyamines as curing agents in a proportion of equivalent weights ranging from 2:0.5 to 1:1.5. The binding agents are used in pigmented and pigment-free lacquers, for use particularly in multi-layer lacquering.
摘要:
The description relates to coating agents for use as primers and fillers in the manufacture of multilayer lacquer coatings, more particularly in the motor-vehicle sector. The coating agent contains a binder mixture of A) 60-75 wt. % of a hydroxy-functional copolymer with an OH number of 110 to 170 mg KOH/g, obtainable from a) 5-60 wt. %, preferably 10-30 wt. % of at least one diester of an alpha, beta-olefinically unsaturated dicarboxylic acid with saturated monohydric alcohols containing 1-8 carbon atoms, b) 10-70 wt. %, preferably 35-60 wt. % of one or more vinyl aromatic hydrocarbons, c) 0-30 wt. %, preferably 0-15 wt. % of one or more glycidyl esters of aliphatic saturated monocarboxylic acids branched in the alpha position, d) 25-50 wt. % of at least one hydroxy alkyl ester or a mixture of at least one alkyl ester and one hydroxyl alkyl ester of an alpha, beta-olefinically unsaturated monocarboxylic acid, and e) 0-10 wt. % of one or more alpha, beta-unsaturated monocarboxylic acids, B) 1-6 wt. % of ester-soluble nitrocellulose, C) 0.5-1.8 wt. % calcium oxide and D) 25-35 wt. % of one or more divalent or polyvalent polyisocyanates.
摘要:
A binder composition suitable for coating agents is described, that contains one or more unsaturated polyesters with an acid number of 5-60 mg KOH/g, a hydroxyl number of 50-200 mg KOH/g and a weight-average molecular weight (Mw) of 500-3000 g/mol, that are obtainable by reaction ofA) one or more alpha,beta-ethylenically unsaturated dicarboxylic acids or their anhydrides,B) one or more hydroxy-functional allyl ethers andC) one or more ethylenically unsaturated compounds with an oxirane group in the molecule,in the molar ratio of A):B):C)=(2 to 4):(2 to 4):(0.5 to 1.8). The composition is suitable in particular for filling putties and filling compounds that dry rapidly, even at low temperatures.
摘要:
A coating and primer composition suitable as a primer for plastics such as a polyolefin which comprises: a) from about 1 to 5% by weight of ethylene/vinyl acetate copolymers, b) from about 0.5 to 5% by weight of chlorinated polyolefins, c) from about 0.01 to 5% by weight of an epoxy resin; and d) from about 85 to 98.49% by weight of an organic solvent, and optionally paint auxiliaries, pigments and/or fillers.A method of priming plastic surfaces of an object, especially polyolefins, and particularly polypropylene, is also provided which comprises applying the aforesaid composition to a plastic surface and drying the same prior to applying paint or finish coating.
摘要:
Previous coating materials lead to the formation of bubbles at high layer thickness and when drying by heating. The new coating materials are intended to be bubble-free when dried at higher layer thicknesses.Aside from pigments and/or extenders, the coating material contains solvents and, if necessary, conventional paint auxiliaries in a vehicle mixture, comprising essentially 60-75% by weight of a hydroxy-functional copolymer, 1-5% by weight of an ester-soluble nitrocellulose and 25-35% by weight of difunctional or multifunctional polyisocyanate. It can be cured without forming bubbles even when applied in thick layers.Use as primer and filler.
摘要:
The description relates to physically drying water-based coating agents. They contain water, metallic pigments, optional other pigments, neutralizing agents, conventional additives, small proportions of solvents and a binder mixture consisting ofA) 50 to 90 wt. % polyurethanes with carbonate groupings and a number average molecular weight of 70000 to 500000 based on reaction products of polyisocyanates with polyhydroxyl compounds, with a content of polyhydroxy polycarbonates andB) 10 to 50 wt. % of carboxylic acid ester groups containing polyurethanes with a number average molecular weight of 20000 to 100000.They are particularly suitable for manufacturing metallic lacquers for repairs in the motor vehicle sector.