Abstract:
The invention relates to polyisocyanates containing allophanate groups and silane groups, to a process for preparing them and to their use as a starting component in the production of polyurethane polymers, more particularly as a crosslinker component in polyurethane paints and coatings.
Abstract:
The present invention relates to polyurethane powder lacquers with optimized flow behavior, a process for their production, a process for coating substrates with these powder lacquers, as well as substrates coated with these powder lacquers.
Abstract:
The present invention relates to an improved process for the preparation of polyisocyanates with a biuret structure by continuous reaction of excess amounts of organic diisocyanates having exclusively aliphatically and/or cycloaliphatically bonded isocyanate groups with organic diamines having exclusively aliphatically and/or cycloaliphatically bonded primary amino groups at elevated temperatures by 2-stage addition of the isocyanate component.
Abstract:
The invention relates to the use of heterocycles containing trivalent phosphorus as a ring member as catalysts for isocyanate modification and to a process for preparing polyisocyanates of the trimer type.
Abstract:
The present invention relates to a process for preparing self-crosslinking polyurethane dispersions by I) reacting a1) polyisocyanates with a2) at least one hydroxyl component having an average OH functionality of ≧2 and a number average molecular weight of 62 to 2500 g/mol, wherein the hydroxyl component contains at least one acid-functional compound containing at least one isocyanate-reactive group, to form an NCO-functional and optionally OH-functional prepolymer, II) then reacting the NCO-functional and optionally OH-functional prepolymer with a3) a hydroxyl component having an average OH functionality of >1 and a4) optionally another polyisocyanate component, which may be the same as or different from a1), to form an OH-functional and NCO-free polyurethane, III) adding a blocked polyisocyanate either before, during or after the reaction of steps I) and II), or forming a blocked polyisocyanate in situ from a polyisocyanate and a blocking agent after the reaction of step II) has taken place, IV) neutralizing the acid groups of the resulting composition by adding a5) a neutralizing agent, and V) dispersing the resulting composition in water. The present invention also relates to the dispersions prepared by the present invention and to their use in coating, adhesive and sealant compositions.
Abstract:
A continuous process for making an acid functional blocked Isocyanate. The process includes continuously feeding and mixing a) one or more polyisocyanates; b) one or more hydroxycarboxylic acids; and c) one or more other isocyanate blocking agent; in a reactor at from 100-240° C. The method provides acid functional blocked Isocyanates useful as crosslinkers for powder coatings.
Abstract:
The invention relates to a process for the production of uretdione polyisocyanates with improved storage stability and their use as a starting component for polyurethane plastics, in particular as a crosslinker component for the production of two-component polyurethane coating compositions.
Abstract:
The present invention relates to a process for the production of polyisocyanates containing uretdione groups bya) oligomerizing a portion of the isocyanate groups of diisocyanates having aliphatically and/or cycloaliphatically bound isocyanate groups in the presence of catalysts or catalyst systems which accelerate the dimerization of isocyanate groups and in the presence of trisubstituted phosphite stabilizers corresponding to formula (I) ##STR1## b) optionally termination of the oligomerization reaction at a degree of oligomerization of 10 to 60% by adding a catalyst poison andc) optionally removing unreacted diisocyanate by extraction or thin-layer distillation.The present invention also relates to the use of the resulting uretdione polyisocyanates as a starting component for polyurethane plastics, particularly as an isocyanate component for the production of uretdione hardeners for powder coating compositions.
Abstract:
The present invention relates to a polyurethane powder coating composition containing A) a binder component which is solid below 40.degree. C. and liquid above 130.degree. C. and has an OH number of 25 to 200 and a number average molecular weight of 400 to 10,000, B) a polyaddition compound which is solid below 40.degree. C. and liquid above 125.degree. C., contains uretdione groups and optionally free isocyanate groups and is prepared from aliphatic and/or cycloaliphatic diisocyanates and C) one or more catalysts containing N,N,N'-trisubstituted amidine groups which have an amidine group content (calculated as CN.sub.2 ; molecular weight=40) of 12.0 to 47.0 wt. %, provided that components A) and B) are present in amounts such that component B) has 0.6 to 1.4 isocyanate groups for each hydroxyl group present in component A) and the amount of component C) is 0.05 to 5 wt. %, based on the total weight of the coating composition. The present invention also relates to the use of this powder coating composition for coating heat resistant substrates.
Abstract:
The present invention relates to a powder coating composition for the production of matt coatings containing as binder A) a component having hydroxyl groups, B) a polyisocyanate having blocked and optionally free isocyanate groups, C) a component having carboxyl groups and/or carboxylic anhydride groups and contains one or more of the following: C1) aliphatic and/or cycloaliphatic dicarboxylic acids having 4 to 20 carbon atoms, C2) monomeric and/or polymeric anhydrides of dicarboxylic acids C1) and C3) aliphatic hydroxycarboxylic acids having 4 to 18 carbon atoms, and D) a component which has groups that are reactive with carboxyl groups and/or carboxylic anhydride groups wherein components A), B), C) and D) are present in amounts such that 1) 0.6 to 1.4 isocyanate groups of component B) are present for each hydroxyl group of component A), 2) 0.3 to 1.5 groups of component D) that are reactive with carboxyl groups and/or carboxylic anhydride groups are present for each carboxyl equivalent of component C) and 3) components C) and D) are present in an amount of 10 to 40 wt. %, based on the total weight of components A), B), C) and D). The invention further relates to heat resistant substrates coated with this powder coating composition.