Abstract: The present invention relates to a process for the production of polyisocyanates containing allophanate groups and having aliphatically and/or cycloaliphatically bound isocyanate groups by reacting organic compounds containing urethane groups with organic polyisocyanates containing aliphatically and/or cycloaliphatically bound isocyanate groups in the presence of tin compounds and to the use of these polyisocyanates, optionally blocked with blocking agents for isocyanate groups, as an isocyanate component in the production of polyurethanes, in particular polyurethane coatings.

Abstract: The invention relates to water-dispersible polyisocyanate mixtures which is the reaction product of A) a lacquer polyisocyanate having a uretdione, isocyanurate, allophanate, biuret, iminooxadiazinedione and/or oxadiazinetrione group and prepared from monomeric diisocyanates and B) a polyalkylene oxide polyether containing at least one carboxylic acid group, wherein the polyalkylene oxide polyether is linked to the lacquer polyisocyanate through a reaction between an isocyanate group and a carboxylic acid group to form an acylated urea group or an amide bond. The invention further relates to a process for their preparation and their use as a starting component in the preparation of polyurethane plastics, in particular as crosslinking agents for water-soluble or -dispersible lacquer binders or binder components with isocyanate-reactive groups.

Abstract: A prepolymer is provided having an NCO value of 5-30% by weight which is the reaction product obtained by reacting an excessive amount of a diphenylmethane diisocyanate containing at least 85% by weight of 4,4′-diphenylmethane diisocyanate or a variant thereof with a polyol composition comprising at least one poly(oxyethylene-oxyalkylene) polyol having an average nominal hydroxyl functionality of 2 to 6, an average hydroxyl equivalent weight of from 1000 to 3000 and an average oxyethylene content of from 50 to 85% by weight.

Abstract: A resin system comprising at least water curable isocyanate functionalized prepolymer and a first catalyst which is chemically bound-in and a second catalyst which is not chemically bound-in. The two catalysts together show a synergistic effect, and the resin system is particularly suitable for orthopaedic splinting applications.

Abstract: A stable and high-solids aqueous dispersion of blocked isocyanates, containing auxiliary solvent, is prepared by (1) preparing a solution of a polyisocyanate mixture of from 20-70% by weight of a blocked, hydrophilically modified polyisocyanate (A) and from 30-80% by weight of a blocked, hydrophobic polyisocyanate (B) in an auxiliary solvent (G) and (2) adding water to this solution, with intensive mixing, in an amount which is such as to give a two-phase system comprising a disperse polyisocyanate phase and a continuous, aqueous phase containing auxiliary solvent. In a preferred embodiment of the invention dispersions are prepared which are virtually free from auxiliary solvent, by first adding a portion of water to the solution (1), substantially removing the auxiliary solvent with intensive mixing and then adding a second portion of water with intensive mixing to the mixture comprising the polyisocyanates (A) and (B) and the first portion of water.

Abstract: A urethanized &bgr;-hydroxyalkylamide compound, a process for its preparation, and powder coating materials containing them.

Abstract: High-functionality polyisocyanates are prepared by a process which comprises

Abstract: The reactivity of isocyanate formulations is controlled by including a chain extender corresponding to the formula HO—R1—NR2—X—NR3—R4—OH  (I) in which R1, R2, X, R3 and R4 represent specified groups is included in the isocyanate formulation.

Abstract: This invention relates to water-dispersible polyisocyanates obtained by reacting a) at least one bishydroxy-functional compound of the formula (I) HO—R1,—[O—CR2R3—O—R1]n—OH  (I)  wherein R1, R2, R3, and n are defined herein, with b) at least one polyisocyanate of the formula (II) Q[NCO]q  (II)  wherein Q and q are defined herein, and subsequently, in any order, with c) at least one monofunctional polyether alcohol of the formula (III) R4—[O—R5]m—O—H  (III)  wherein R4, R5, and m are defined herein, and optionally with d) at least one compound of the formula (IV) H—O—[R5—O]o—N+R6R7R8 X−  (IV)  wherein R5, R6, R7, R8, O, and X− are defined herein.

Abstract: Polyisocyanates of the formula (I) (polyisocyanate I),

Abstract: Low-monomer, NCO-containing prepolymers based on 1,4-diisocyanato-2,2,6-trimethylcyclohexane, a process for their preparation, and their use.

Abstract: The present invention relates to polyaddition compounds, which are solid below 40° C. and liquid above 125° C., are prepared by the reaction of an isocyanate component containing uretdione groups with a polyol containing ester and/or carbonate groups, other than hydroxypivalic acid neopentylglycol ester, and have a) an average isocyanate functionality of 2.0 to 8.0 and a content of free isocyanate groups (calculated as NCO; molecular weight=42) of 2.1 to 6.0 wt. %, b) a content of uretdione groups (calculated as C2N2O2; molecular weight=84) of 10 to 19 wt. %, c) a content of urethane groups (calculated as —NH—CO—O; molecular weight=59) of 10 to 17 wt. % and d) a content of ester groups —CO—O (calculated as —CO—O; molecular weight=44) and/or carbonate groups —O—CO—O (calculated as —CO—O; molecular weight=44) of 1 to 17 wt. %.

Abstract: A polyisocyanate prepolymer with isocyanate group on terminal obtainable by reaction of (A) polyoxyalkylenepolyol, (B) polyhydric alcohol having a molecular weight of 90 to 250 and the number of hydroxyl group of 2 to 3 with branched alkyl group and/or cyclohexane ring and (C) organic polyisocyanate composed of bis(isocyanatemethyl)cyclohexane, wherein NCO group content in the polyisocyanate prepolymer is 8% by weight or above and urethane group content in the polyisocyanate prepolymer is 8% by weight or above and sum total of NCO group content and urethane group content is 16 to 30% by weight and a concentration of unreacted (C) organic polyisocyanate remained in the polyisocyanate prepolymer is 1% by weight or below.

Abstract: Amine-terminated urethane oligomer compositions are described that include very high oligomer concentrations. The compositions are melts of the amine-terminated oligomers. The compositions can include one or more property modifiers. The compositions are useful in the formation of crosslinked copolymers, especially with epoxy resins. The resulting copolymers are useful in the formation of coatings.

Abstract: Solid polyurethane hardeners (curing agents) having triazine groups, are prepared by reacting polyaddition compounds with a second compound having a >C═N— group. The polyaddition compounds are prepared by reacting a uretdione-functional polyisocyanate with a hydroxy-functional chain extender.

Abstract: A resin system comprising at least water curable isocyanate functionalized prepolymer and a first catalyst which chemically bound-in and a second catalyst which is not chemically bound-in. The two catalysts together show a synergistic effect, and the resin system is particularly suitable for orthopaedic splinting applications.

Abstract: This invention relates to liquid polyisocyanate compositions having improved freeze stability. These liquid polyisocyanate compositions have an NCO group content of 15 to 30%, and comprise a blend of (A) an MDI adduct having an NCO group content of 15 to 30%, and (B) an allophanate-modified MDI having an NCO group content of 12 to 32.5%.

Abstract: Amine-terminated urethane oligomer compositions are described that include very high oligomer concentrations. The compositions are melts of the amine-terminated oligomers. The compositions can include one or more property modifiers. The compositions are useful in the formation of crosslinked copolymers, especially with epoxy resins. The resulting copolymers are useful in the formation of coatings.

Abstract: Partially or completely blocked polyisocyanates having an built-in HALS stabilizer.