摘要:
Aqueous coatings for the multi-layer painting of motor vehicles based on one or more binders and optionally crosslinking agents, pigments and/or fillers, paint industry additives and/or solvents, which contain as binder an aqueous dispersion based on polyurethane/polymer hybrid polymers having a numerical average of the molar mass (Mn) of 8000 to 1500000, a ratio by weight of polyurethane to polymer content of 0.05:1 to 50:1, a hydroxyl number of 0 to 150 mg KOH/g, based on solid resin, hydroxyl groups bound to silicon not being included when calculating the OH number, and an acid number of 1.5 to 40 mg KOH/g, based on solid resin, and a content of 0.5 to 150 mmole of silicon per 100 g of solid resin in the form of siloxane bridges (--Si--O--Si--) bound into the polyurethane content and/or in the form of silanol groups bound to the polyurethane content.
摘要:
Aqueous dispersion of silane-functional polyurethane resins having a number average molecular weight of 10000 to 500000 and a silicon content of 1 to 30 mmol per 100 g of resin solids obtainable by reacting(A) adducts containing NCO groups, which adducts are obtainable by reactinga) one or more compounds having at least one ionic or ionisable and/or hydrophilic nonionic group, and more than one isocyanate-reactive group withb) one or more organic diisocyanates,(B) with polyesters having an OH value of 150 to 300 mg of KOH/g and more than three OH groups per molecule, which are obtainable by reactingc) polyalcohols withd) polycarboxylic acids ande) monofatty acids(C) optionally with linear polyesters having an OH value of 40 to less than 150 mg of KOH/g, which contain no monofatty acids, and(D) with organic polyisocyanates, wherein at least a proportion of the polyisocyanates has at least one functional group R.sup.1 OSi.tbd. in whichR.sup.1 means C.sub.1 to C.sub.8 alkyl or --C(O)R.sup.2 and R.sup.2 means C.sub.1 to C.sub.10 alkyl,and converting the reaction product into an aqueous dispersion.
摘要:
This invention relates to a water-thinnable dispersion of one or more cationically modified and urethane-modified (meth)acrylic copolymers, which are produced by the solution polymerisation of unsaturated monomers which are polymerisable by a radical mechanism, or of a mixture of such monomers. Coating media based on this dispersion are particularly suitable for the production of base coats in multi-layer coatings, particularly in the coating of vehicles and vehicle parts.
摘要:
There are described aqueous dispersions of polyurethane resins, the production thereof and their use in aqueous coating agents, said dispersions being obtainable in aqueous or non-aqueous phase froma) polyurethane resins with at least one CH acidic group, an ionic or non-ionic hydrophilic group and, optionally, OH and/or NH groups, byb) introduction of olefinic double bonds by reaction withb.sub.1) compounds with a CH acidic group and an olefinic double bond, and/orb.sub.2) compounds with an olefinic double bond and also a group that is capable of reacting with CH acidic groups, and/orb.sub.3) compounds with an olefinic double bond and also a group that is capable of reacting with OH or NH groups, orb.sub.4) formaldehyde,whereupon, optionally, conversion into the aqueous phase and radical polymerization are effected.
摘要:
A pigment paste containing water-dilutable hydroxy-functional polyurethaneurea paste resins with a urea group content (calculated as —NHCONH—) of 10 to 300 mmol, a urethane group content (calculated as —NHCOO—) of 20 to 300 mmol, each per 100 g of solid resin, an OH value of 20 to 250 mg KOH/g, an acid value of 15 to 80 and a molecular weight Mn of 1000 to 20000 obtainable by I) preparing a NCO group-containing polyurethane prepolymer by reacting a1) hydroxy-functional compounds with a molecular weight (Mn) of 360 to 8000 with a2) polyisocyanates and a3) compounds with at least one group which can react with isocyanate and at least one ionic group, II) subsequent reaction of the prepolymer with a4) hydroxy-functional monoamines and optionally polyols and III) neutralisation of groups which can be converted into ionic groups.
摘要:
This invention relates to a stove-enamel coating medium based on at least one binder vehicle selected from amino(meth)acrylate resins and/or epoxide-amine addition products comprising cationic groups and/or groups which can be converted into cationic groups. The binder vehicle additionally comprises cyclic carbonate groups and/or at least one crosslinking agent which comprises cyclic carbonate groups is present, and the binder vehicle also contains secondary amino groups and/or hydroxyl groups.
摘要:
An aqueous binder vehicle dispersion and coating media, which can be used for multi-layer coating, wherein the dispersion is obtainable by the reaction ofI. 20 to 97% by weight of a polyurethane(-urea) resin containing groups which are reactive towards a chain extender IV), having a number average molecular weight (Mn) of 1000 to 10,000, and 8 to 80 milliequivalents per 100 g of ionic groups, groups which can be converted into ionic groups and/or hydrophilic groups,II. 0 to 30% by weight of a polyester resin having a number average molecular weight (Mn) of 500 to 5000, and having the same groups as in I) which are reactive towards IV), andIII. 3 to 80% by weight of a (meth)acrylic copolymer containing 0 to 40 milliequivalents per 100 g of ionic groups, groups which can be converted into ionic groups with the same charge as in I) and/or hydrophilic groups, having the same groups as in I) and II) which are reactive towards IV), wherein at least 50% by weight of III) has been produced in the presence of at least part of components I) and/or II), withIV. one or more chain extenders,and conversion into the aqueous phase.
摘要:
Coating media and their use in processes for producing single-layer and multi-layer coatings are described. The coating media contain an aqueous mixture comprisingI. 99-70% by weight of a mixture ofA) 50-100% by weight of one or more binder vehicles which at least in part contain ionic groups,B) 0-50% by weight of one or more crosslinking agents, which at least in part may contain ionic groups, for binder vehicle A), wherein the ionic groups which are present have the same charge as those of component A), andII. 1-30% by weight of one or more binder vehicles (component C), which are miscible both with the binder vehicles of component A) at the storage temperature and with each other at the curing temperature of the coating media and which contain ionic groups, the charge of which is opposite to the charge of the ionic groups of component I), wherein the percentages by weight are given with respect to the weight of resin solids in each case and wherein the proportions of components I) and II) are matched to each other so that 0.5 to 70% of the number of charges of the ionic groups of I) are neutralised by the charges of the ionic groups of II), andIII. customary lacquer additives and/or pigments and/or extenders, and optionally one or more customary lacquer solvents.
摘要:
The invention is directed to hydrophilic sagging control agents comprising at least one urea group and to aqueous coating compositions containing those hydrophilic sagging control agents. The sagging control agents are obtained by reacting A) at least one hydrophilic polyisocyanate with B) at least one amino-functional compound selected from a group consisting of an amine with at least one primary amino group and at least one hydroxyl group, having the at least one primary amino group on a primary carbon atom, an amino ether with at least one primary amino group, having the at least one primary amino group on a primary carbon atom and mixtures thereof.
摘要:
Aqueous electrophoretic lacquer capable of being deposited cataphoretically, containing A) an aqueous dispersion of cationically modified polyurethane (meth)acrylates (a1) with terminal, ethylenically unsaturated (meth)acrylic double bonds, and reactive thinner (a2) with at least two ethylenically unsaturated (meth)acrylic double bonds, the (meth)acrylic double bonds of the mixture of (a1) and (a2) corresponding to a bromine number of 20 to 150 g bromine/100 g solids, and B) photoinitiators and optionally free-radical initiators capable of thermal activation, the terminal, ethylenically unsaturated (meth)acrylic double bonds of the polyurethane (meth)acrylates being bonded with the anionically modified polyurethane prepolymer via urethane, urea, amide or ester groups, and optionally conventional auxiliary substances and additives, pigments and/or fillers.