Abstract:
The invention relates to binders for cathodically depositable coating compositions for the electrocoating lacquering process using cationic synthetic resins, which binders have been obtained by polymerizing (A) 5 to 95% by weight of ethylenically unsaturated polymerizable monomers in the presence of (B) 95 to 5% by weight of a cationic synthetic resin in an aqueous phase, the total amount of the components (A) and (B) being 100%. Esters of acrylic acid and/or methacrylic acid are preferable for use as component (A). The invention also relates to a process for preparing the binders and to their use for cathodically depositable electrocoating lacquers.
Abstract:
The invention relates to binders for cathodically depositable coating compositions for the electrocoating lacquering process using cationic synthetic resins, which binders have been obtained by polymerizing (A) 5 to 95% by weight of ethylenically unsaturated polymerizable monomers in the presence of (B) 95 to 5% by weight of a cationic synthetic resin in an aqueous phase, the total amount of the components (A) and (B) being 100%.Esters of acrylic acid and/or methacrylic acid are preferable for use as component (A). The invention also relates to a process for preparing the binders and to their use for cathodically depositable electrocoating lacquers.
Abstract:
The invention relates to a basecoat/clearcoat process in which the basecoat composition used contains as a film former a polyurethane resin which can be prepared by preparing an intermediate from(A) a mixture obtained from 10 to 90 mol % of linear polyether diols and 90 to 10 mol % of polyester diols,(B) diisocyanates,(C) compounds which contain two groups reactive toward isocyanate groups, at least some of these compounds having at least one group capable of forming anions,and the free isocyanate groups of the said intermediate are then reacted with(D) polyols containing at least three hydroxyl groups, and the reaction product obtained in this manner is transferred into an aqueous base, whereina) the polyester diol is prepared from diols and an acid component which consists of 60 to 100% by weight of aliphatic dicarboxylic acids of more than 18 carbon atoms and of 40 to 0% by weight of aliphatic dicarboxylic acids of 2 to 18 carbon atoms,b) the equivalent ratio of the NCO groups to the total of the OH groups of (A) and the reactive groups of (C) is 2:1 to 1.05:1 andc) the equivalent of the OH groups of the component (D) to the NCO groups of the intermediate is 0.5:1 to 4:1.
Abstract:
The invention relates to a process for the preparation of macromonomers which carry at least two hydroxyl groups at one end. The process comprises(1) reacting a polyester, polyether, polyurethane, polyurea or polyamide prepolymer which has a number average molecular weight of 300 to 3000, preferably 500 to 2000, and contains an average of one terminal hydroxyl or amino group and at least one carboxyl group per molecule with a diisocyanate to form an intermediate which contains an average of one terminal isocyanate group and at least one carboxyl group per molecule, and subsequently reacting this intermediate(2) with a compound which has a molecular weight of 90 to 800, preferably 120 to 300, and contains at least two hydroxyl groups in addition to a group which is reactive to isocyanate groups, to form a macromonomer which carries an average of at least one carboxyl group and, at one end, at least two hydroxyl groups per molecule.
Abstract:
The invention relates to coating compositions which are particularly suitable for the preparation of the basecoat for two-coat coatings of the basecoat/clearcoat type, and which comprise organic diluents, at least one resin containing urethane and urea groups, and, where appropriate, other resins, pigments and other conventional additives in common use. The coating compositions according to the invention are those which comprise at least one resin containing urethane and urea groups, which resin is obtainable by reactinga1) a compound having two hydroxyl groups reactive toward isocyanate groups, witha2) an aliphatic and/or cycloaliphatic di-isocyanateto form a prepolymer (A) containing isocyanate groups, and by subsequently reacting the isocyanate groups of the prepolymer (A), at least in part, witha3) an adduct produced from a (meth)acrylic ester, preferably an acrylic ester, and an aliphatic or cycloaliphatic compound containing at least two aminic hydrogen atoms, the adduct containing at least one active aminic hydrogen atom.
Abstract:
The invention relates to dispersions of crosslinked polymer micro-particles in aqueous media, which have been prepared:(1) (a) by dispersing a mixture of the components (A) and (B) in an aqueous medium, the component (A) being composed of one or more polyester-polyols containing at least 2 hydroxyl groups, and the component (B) being composed of one or more polyisocyanate compounds in which the isocyanate groups are at least partially in the masked form, and the components (A) and/or (B) having available a number of ionic groups, preferably carboxylate groups, sufficient to form a stable dispersion, and at least one part of the components (A) and/or (B) containing more than 2 hydroxyl or optionally masked isocyanate, respectively, groups per molecule and(2) (b) by subsequently heating the dispersion thus obtained to a temperature sufficiently high for the components (A) and (B) to react to form crosslinked polymer micro-particles.
Abstract:
The invention relates to a basecoat/clearcoat process in which the basecoat composition used contains as a film former a polyurethane resin which can be prepared by preparing an intermediate from(A) a mixture obtained from 10 to 90 mol % of linear polyether diols and 90 to 10 mol % of polyester diols,(B) diisocyanates,(C) compounds which contain two groups reactive toward isocyanate groups, at least some of these compounds having at least one group capable of forming anions, and the free isocyanate groups of the said intermediate are then reacted with(D) polyols containing at least three hydroxyl groups, and the reaction product obtained in this manner is transferred into an aqueous base, whereina) the polyester diol is prepared from diols and an acid component which consists of 60 to 100 % by weight of aliphatic dicarboxylic acids of more than 18 carbon atoms and of 40 to 0 % by weight of aliphatic dicarboxylic acids of 2 to 18 carbon atoms,b) the equivalent ratio of the NCO groups to the total of the OH groups of (A) and the reactive groups of (C) is 2:1 to 1.05:1 andc) the equivalent of the OH groups of the component (D) to the NCO groups of the intermediate is 0.5:1 to 4:1.
Abstract:
Dispersions of crosslinked polymer micro-particles in aqueous media, a process for the preparation of these dispersions, and coating compositions containing these dispersions.The invention relates to dispersions of crosslinked polymer micro-particles in aqueous media, which have been prepared:(1) by dispersing a mixture of the components (A) and (B) in an aqueous medium, the component (A) being composed of one or more polyester-polyols containing at least 2 hydroxyl groups, and the component (B) being composed of one or more polyisocyanate compounds, and the component (A) having available a number of ionic groups, preferably carboxylate groups, sufficient to form a stable dispersion, and at least one part of the components (A) and/or (B) containing more than 2 hydroxyl or isocyanate, respectively, groups per molecule and(2) by subsequently heating the dispersion thus obtained to a temperature sufficiently high for the components (A) and (B) to react to form crosslinked polymer micro-particles.
Abstract:
Polymer obtainable by a multistage polymerization process which involves conducting, in a first step, an aqueous-phase polymerization of at least one ethylenically monofunctional compound alone or together with at least one ethylenically difunctional or poly-functional compound together in the presence of a polyesterpolyol, polyurethane and/or polyacrylate; and, in a subsequent step, a reaction of the resulting product with at least one ethylenically monofunctional compound alone or together with at least one ethylenically difunctional or polyfunctional compound; followed by a reaction of the resulting product with a crosslinker; and its use.
Abstract:
The invention relates to aqueous coating compositions comprising:an aqueous, polyester- and acrylate-based polymer dispersion obtainable by free-radical polymerization of at least:a. one (meth)acrylic acid ester;b. one ethylenically unsaturated, at least monofunctional acid; and optionallyc. one ethylenically unsaturated monomer other than (a) and (b)or mixtures thereof, with a poly ester resin capable of undergoing a free-radical polymerization;one amino resin as crosslinking agent,one water-soluble and/or water-emulsifiable polyalcohol and optionally conventional laquer additives.Furthermore, the invention relates to the use of these aqueous coating compositions as clear coats for the preparation of multi-layer coatings.