Abstract: This invention relates to storage-stable, liquid, partially trimerized polyisocyanates having an NCO group content of 24 to 40% by weight, and comprising 20 to 88% by weight of toluene diisocyanate and 12 to 80% by weight of a polyisocyanate of the diphenylmethane series. The present invention also relates to a process for the preparation of the storage-stable, liquid, partially trimerized polyisocyanates; to storage-stable, liquid urethane prepolymers of these partially trimerized polyisocyanates; and to a process for the production of these storage-stable, liquid, urethane prepolymers.

Abstract: This invention relates to storage-stable, liquid, partially trimerized polyisocyanates having an NCO group content of 24 to 40% by weight, and comprising 20 to 88% by weight of toluene diisocyanate and 12 to 80% by weight of a polyisocyanate of the diphenylmethane series. The present invention also relates to a process for the preparation of the storage-stable, liquid, partially trimerized polyisocyanates; to storage-stable, liquid urethane prepolymers of these partially trimerized polyisocyanates; and to a process for the production of these storage-stable, liquid, urethane prepolymers.

Abstract: This invention relates to a process for the reduction of color of polymethylene poly(phenylisocyanates). This process comprises mixing a polymethylene poly(phenylisocyanate) with an epoxide having an epoxide equivalent weight of about 44 to about 700, and heating this mixture to a temperature of from about 35 to about 150.degree. C. for at least about 15 minutes, with stirring. Suitable epoxides include epoxidized fatty acid monoglycerides, epoxidized fatty acid diglycerides, epoxidized fatty acid triglycerides, epoxidized dimer fatty acids and epoxidized trimer fatty acids.

Abstract: The present invention relates to a process for preparing aqueous polyurethane dispersions in a multi-step process by forming an NCO prepolymer bya) reacting a cyclic diisocyanate with a compound containing one or two isocyanate-reactive groups and at least one carboxylic acid or carboxylate group at a molar ratio of cyclic diisocyanate to compound containing one isocyanate-reactive group of at least 1:1 or a molar ratio of cyclic diisocyanate to compound containing two isocyanate-reactive groups of at least 1.

Abstract: The present invention is directed to a powder coating composition containing as binderA) a polyisocyanate component which contains blocked isocyanate groups, is present in powder form, is solid below 40.degree. C. and liquid above 150.degree. C., and contains one or more polyisocyanatesi) having a blocked NCO content (calculated as NCO, MW 42) of 5 to 25% by weight andii) containing fluorine (calculated as F, AW 19) in an amount of 0.01 to 20% by weight,wherein the preceding percentages are based on the solids content of the polyisocyanate mixture andB) a polyhydroxyl component containing one or more high molecular weight polyols.

Abstract: The present invention relates to aqueous dispersions of polyurethanes containing hydantoin groups (calculated as C.sub.3 N.sub.2 O.sub.2, MW 96) in an amount of 1 to 40% by weight, based on resin solids. The present invention also relates to the use of these dispersions for preparing coatings with excellent hydrolytic and thermal stability.

Abstract: The present invention relates to a coating composition for the preparation of a polyurea coating which containsa) an NCO prepolymer containing aromatically bound isocyanate groups andb) an aldimine corresponding to the formulaX.sub.1 --?N.dbd.CHCH(R.sub.1)(R.sub.2)!.sub.nwhereinX.sub.1 represents an organic group which has a valency of n and is obtained by removing the amino groups from a cyclic organic polyamine having (cyclo)aliphatically-bound amino groups,R.sub.1 and R.sub.2 may be identical or different and represent organic groups which are inert towards isocyanate groups at a temperature of 100.degree. C. or less, or R.sub.1 and R.sub.2 together with the .beta.-carbon atom form a cycloaliphatic or heterocyclic ring, andn represents an integer having a value of at least 2,in which components a) and b) are present in amounts sufficient to provide an equivalent ratio of isocyanate groups to aldimine groups of about 1.0:0.7 to 1.0:0.1.

Abstract: The present invention relates to blocked polyisocyanates containing at least one isocyanate group which is reversibly blocked with a monofunctional blocking agent for isocyanate groups and at least one isocyanate group in the form of a urea group, which may be converted to a thermally stable hydantoin group. The present invention also relates to one-component coating compositions containing these blocked polyisocyanates and compounds containing isocyanate-reactive groups.

Abstract: The present invention relates to aqueous dispersions of polyureas containing hydantoin groups (calculated as C.sub.3 N.sub.2 O.sub.2, MW 96) in an amount of 1 to 40% by weight, based on resin solids. The present invention also relates to the use of these dispersions for preparing coatings having excellent hydrolytic and thermal stability.

Abstract: The present invention relates to aqueous polyurea dispersions wherein the polyureas contain 0.1 to 25% by weight, based on the weight of the polyureas, of en-urea groups (calculated as --NH--C(O)--N--, MW 57) obtained by the reaction of an isocyanate group with an aldimine group prepared from a cyclic polyamine containing (cyclo)aliphatically bound amino groups.The present invention also relates to a process for preparing these aqueous polyurea dispersions and to their use for preparing coatings.

Abstract: The present invention relates to blocked polyisocyanates containing at least one isocyanate group which is reversibly blocked with a monofunctional blocking agent for isocyanate groups and at least one isocyanate group in the form of a thermally stable hydantoin group. The present invention also relates to one-component coating compositions containing these blocked polyisocyanates and compounds containing isocyanate-reactive groups.

Abstract: The present invention relates to blocked polyisocyanates containing at least two isocyanate groups which are reversibly blocked with a monofunctional blocking agent for isocyanate groups and at least two isocyanate groups in the form of urea groups, which may be subsequently converted to thermally stable hydantoin groups. The present invention also relates to one-component coating compositions containing these blocked polyisocyanates and compounds containing at least two isocyanate-reactive groups.

Abstract: The present invention relates to blocked polyisocyanates containing at least two isocyanate groups which are reversibly blocked with a monofunctional blocking agent for isocyanate groups and at least two isocyanate groups in the form of thermally stable hydantoin groups. The present invention also relates to one-component coating compositions containing these blocked polyisocyanates and compounds containing at least two isocyanate-reactive groups.

Abstract: The present invention is directed to an organic polyurethane composition having a solids content of about 10 to 100 weight percent which comprises(1) isocyanate-terminated prepolymers which are prepared by reacting reaction products of the phosgenation of aniline-formaldehyde condensates containing specific ratios of isomers and homologues with polyether polyols containing at least two hydroxyl groups and at least one tertiary nitrogen atom and, optionally, an additional polyol which does not contain a tertiary nitrogen atom and optionally,(2) a monoisocyanate comprising a member selected from para-toluenesulfonyl isocyanate and the reaction product of 2,4- or 2,6-toluene diisocyanate or mixtures thereof with specific monoalcohols.The present invention is also directed to the coatings produced from the polyurethane compositions, optionally containing pigments.