摘要:
This invention relates to aqueous, crosslinkable binder dispersions which have a low solvent content and contain hydroxy-functional polyethers, hydroxy-functional acrylate copolymers and hydroxy- and carboxy-functional acrylate copolymers, to a process for the production of these binders, to one and two-component binder compositions containing these binders and to the use of the binder compositions in coating compositions.
摘要:
Described herein is a process for the preparation of 1,3-dioxan-2-one group-containing oligourethanes by reacting a) hydroxy-functional 1,3-dioxan-2-ones with b) compounds having an average of at least two isocyanate groups per molecule; the oligourethanes obtainable by this process; and their use, optionally in combination with compounds containing active hydrogen atoms, for the preparation of plastics or as a binder or binder component in coating compositions.
摘要:
Aqueous solutions or dispersions of copolymers A) a process of making them and their use in binder compositions. Copolymers A) containing a hydroxy-functional, hydrophobic copolymer I) containing 30 to 85% by weight of (meth)acrylic acid esters having C1 to C18 hydrocarbon radicals in the alcohol portion, aromatic vinyl compounds and/or vinyl esters and 5 to 45% by weight of hydroxy-functional monomers; a hydroxy- and carboxy-functional, hydrophilic-hydrophobic copolymer II) containing 4 to 20% by weight of (meth)acrylic acid esters having C1 to C18 hydrocarbon radicals in the alcohol portion, aromatic vinyl compounds and/or vinyl esters, 4 to 15% by weight of hydroxy-functional monomers and 0.8 to 3.0% by weight of acid-functional monomers; and optionally a hydroxy-functional hydrophobic copolymer III) containing 0 to 16% by weight of hydroxy- and/or non-functional (meth)acrylic acid esters or aromatic vinyl compounds, wherein 1) the sum of Ia), Ib), IIa), IIb) IIc) and IIIa) is 100%, based on the weight of these components, 2) copolymers A) have an acid number, based on solids, of 10 to 28 mg KOH/g substance, 3) the weight percent of monomers IIc) in monomer II) is less than 25% by weight and 4) the weight percent of hydroxy-functional monomers IIb) in copolymer II) is higher than the weight percent of hydroxy-functional monomers Ib) in copolymer I).
摘要:
The present invention relates to a process for reusing the overspray obtained when spraying water dilutable two-component polyurethane coating compositions containing a polyisocyanate and a compound containing isocyanate reactive groups by(i) collecting the overspray and optionally diluting it with water,(ii) simultaneously with or after step (i), reacting the overspray, optionally in the presence of emulsifiers, with compounds which are more reactive with isocyanate groups than both water and the compounds containing isocyanate reactive groups and(iii) reusing the resulting aqueous solution or dispersion of the chemically modified overspray in a one- or two-component, chemically and/or physically drying coating composition, optionally after adjusting the spray viscosity of the coating compositions to a suitable spray viscosity by either removing or adding water and optionally after the addition of additives.
摘要:
The present invention relates to a process for the production of polyhydroxyl compounds having a hydroxyl group content of 2 to 10% by weight and a viscosity at 23.degree. C. of 250 to 80,000 mPa.s by the radically initiated polymerization at a reaction temperature of 80.degree. to 220.degree. C. ofa) 100 parts by weight of a mixture of olefinically unsaturated monomers containing at least 1% by weight of monomers containing alcoholic hydroxyl groups in the presence ofb) 5 to 500 total parts by weight, which may be present at the beginning of the reaction or added during the reaction, of one or more cyclic compounds which, in the presence of initiator compounds containing alcoholic hydroxyl groups, are capable of a ring-opening polymerization reaction andc) 2 to 300 parts by weight, which may be present at the beginning of the reaction or added during the reaction, of one or more polyhydric alcohols having a molecular weight of 62 to 1000.The present invention also relates to the polyhydroxyl compounds obtained by this process and to their use in combination with suitable hardeners as binders for one-component or two-component coating compositions.
摘要:
The present invention relates to a hydroxy-functional copolymer P, which is present as a dispersion and/or solution in water, and is obtained by successively carrying out process steps A-D: A) initially introducing a hydrophobic polymer containing hydroxyl groups into a reaction vessel, B) introducing an initiator component into that vessel, C) subsequently polymerizing a hydrophobic monomer mixture containing hydroxyl groups in that vessel and D) subsequently polymerizing a hydrophilic monomer mixture containing hydroxyl and acid groups in that vessel. The present invention also relates to a process for the preparation of copolymers P following the procedure previously set forth and to coating compositions containing these copolymers P and one or more crosslinking agents.
摘要:
The present invention relates to aqueous polyurethane-urea dispersions having a resin solids content of at least 35 wt. % and a pH of at least 7.5 which are prepared bya) forming an isocyanate-terminated prepolymer by reacting a difunctional polyol having a molecular weight of 500 to 6000, a low molecular weight alcohol, a diisocyanate and/or triisocyanate and an isocyanate-reactive compound which has an acid group,b) neutralizing 65% to 95% of the acid groups prior to dispersing the prepolymer in water,c) dispersing the neutralized prepolymer in water,d) chain extending the isocyanate groups with water to form a polyurethane-urea, ande) after completion of the chain extending reaction adding additional neutralizing agent to provide a total amount of neutralizing agent that is sufficient to neutralize at least 115% of the acid groups of component D),wherein the polyurethane-urea contains 1.0 to 4.0%, based on resin solids, of the isolated urea groups. The present invention also relates to a process for the preparation of these polyurethane-urea dispersions and to their use in coating compositions.
摘要:
The present invention relates to a hydroxy-functional copolymer P, which is present as a dispersion and/or solution in water, and is obtained by successively carrying out process steps A-D: A) initially introducing a hydrophobic polymer containing hydroxyl groups into a reaction vessel, B) introducing an initiator component into that vessel, C) subsequently polymerizing a hydrophobic monomer mixture containing hydroxyl groups in that vessel and D) subsequently polymerizing a hydrophilic monomer mixture containing hydroxyl and acid groups in that vessel. The present invention also relates to a process for the preparation of copolymers P following the procedure previously set forth and to coating compositions containing these copolymers P and one or more crosslinking agents.
摘要:
The present invention relates to a process for preparing aqueous binders for aqueous coating compositions by reacting a mixture of A) 9.9 to 85 wt. % of a hydroxy- and acid-functional poly(meth)acrylate andB) 14.9 to 90 wt. % of a hydroxy-functional, fatty acid-modified polyester with C) 0.1 to 20 wt. % of a diisocyanate having a molecular weight of 140 to 318, to form urethane groups and then dissolving or dispersing the reaction product in water with prior or simultaneous neutralization of at least a portion of the carboxyl groups present, wherein the sum of the percentages of A) to C) add up to 100. The present invention also relates to the aqueous binders obtained by this process and their use, optionally combined with other oxidatively drying lacquer resins, in air- and/or heat-drying, two-component coating compositions, preferably aqueous polyurethane coating compositions, or in combination with optionally blocked polyisocyanates and/or amino cross-linking agents in aqueous heat-curing coating compositions.
摘要:
The present invention relates to aqueous polyesters for high-solids stoving coatings which containa) 35.0 to 65.0% by weight of a polyester resin containing urethane, carboxyl and hydroxyl groups and containing the reaction product of77 to 89% by weight of a branched polyester polyol having a hydroxyl number of 125 to 175, an acid number of less than 4 and a molecular weight of 2,500 to 6,500,2) 2.5 to 4.5% by weight of a 2,2-bis-(hydroxymethyl)alkane carboxylic acid,3) 0 to 3.5% by weight of a diol component having a molecular weight of 62 to 250 and4) 9 to 19% by weight of a diisocyanate component, wherein the percentages of a1), a2), a3) and a4) add up to 100%, based on the weight of a1), a2), a3) and a4),b) 0.1 to 1.5% by weight of a basic neutralizing agent which is sufficient to convert 35 to 100% of the carboxyl groups of component a) to carboxylate groups,c) 0 to 7.5% by weight of an organic auxiliary solvent andd) 26 to 64.9% by weight water,wherein the percentages of a), b), c) and d) add up to 100%, based on the weight of a), b), c) and d).