Abstract: Blocked polyisocyanates containing aliphatically and/or cycloaliphatically bound isocyanate groups blocked by a mixture of blocking agents containingA) 30 to 70 equivalent % of 1,2,4-triazole,B) 30 to 70 equivalent % of 3,5-dimethylpyrazole, andC) 0 to 30 equivalent % of other blocking agents,a method of preparing these blocked polyisocyanates by blocking the isocyanate groups of a (cyclo)aliphatic polyisocyanate, wherein up to 20 NCO equivalent % of the isocyanate groups may optionally be reacted with compounds containing carboxylic acid hydrazide groups and isocyanate-reactive groups, and the use of the blocked polyisocyanates as crosslinking agents for organic polyhydroxyl compounds in one-component polyurethane stoving compositions.

Abstract: Polyisocyanate polyaddition products which are solid below 40.degree. C. and liquid above 125.degree. C., contain uretdione and urethane groups and have a content of at least 1 wt. % of urethane groups obtained from the reaction of dimeric diols with isocyanate groups; a method of producing the these products by the reaction of polyisocyanates containing uretdione groups with dimeric diols; and the use of these polyaddition compounds as the starting component in the manufacture of polyurethane plastics, particularly as the cross-linking component in thermally cross-linkable two-component polyurethane powder coating compositions.

Abstract: A process for producing a flexible or rigid polyurethane foam is provided in which a polyol and a polyisocyante are reacted in the presence of an amine catalyst, a blowing agent, and a foam stabilizer, the amine catalyst comprising at least one amine compound represented by General Formula (1) below: ##STR1## where R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are respectively an alkyl group of 1 to 6 carbons independently; n is an integer of 0 or 1; and A is an alkyl group of 11 to 14 carbons when n is 0, or an alkylene group of 10 to 15 carbons when n is 1. The amine catalyst has low odor and low volatility, and gives high curing rate, and excellent moldability with a formulation of reduced fluorocarbon and increased water as the blowing agent.

Abstract: The present invention relates to a coating composition for the preparation of a polyurea coating which containsa) a polyisocyanate component containing one or more aliphatic polyisocyanates,b) at least one polaspartic acid esterc) 0.05 to 5% by weight, based on the total weight of the coating composition, of an organic acid,wherein components a) and b) are present in amounts sufficient to provide an equivalent ratio of isocyanate groups of component a) to isocyanate-reactive groups of component b) of 0.5:1 to 20:1.

Abstract: The present invention is directed to a polyisocyanate mixturei) having an NCO content of 5 to 35% by weight and prepared from an organic diisocyanate,ii) containing at least 1% by weight of isocyanurate groups (calculated as N.sub.3, C.sub.3, O.sub.3, MW 126),iii) containing allophanate groups in an amount such that there are more equivalents of allophanate groups than urethane groups andiv) containing fluorine (calculated as F, AW 19) in an amount of 0.

Abstract: There are described aqueous dispersions of polyurethane resins, the production thereof and their use in aqueous coating agents, said dispersions being obtainable in aqueous or non-aqueous phase froma) polyurethane resins with at least one CH acidic group, an ionic or non-ionic hydrophilic group and, optionally, OH and/or NH groups, byb) introduction of olefinic double bonds by reaction withb.sub.1) compounds with a CH acidic group and an olefinic double bond, and/orb.sub.2) compounds with an olefinic double bond and also a group that is capable of reacting with CH acidic groups, and/orb.sub.3) compounds with an olefinic double bond and also a group that is capable of reacting with OH or NH groups, orb.sub.4) formaldehyde,whereupon, optionally, conversion into the aqueous phase and radical polymerization are effected.

Abstract: Allophanate-modified MDI which is a storage stable liquid at 25.degree. C. is produced in two steps. First, a monoisocyanate is reacted with an organic material having about 1.8 or more hydroxyl groups and a molecular weight of from about 60 to about 6,000 to form the urethane. The urethane is then reacted with an isomeric mixture of MDI in an amount such that the resultant isocyanate will have an NCO content of from about 3 to about 28%. The isomeric mixture of diphenylmethane diisocyanate contains from about 0 to about 60% by weight 2,4'-diphenylmethane diisocyanate, less than 6% by weight 2,2'-MDI and the remainder 4,4'-MDI. The prepolymers of this invention are particularly useful in reaction injection molding processes because molded articles having improved flex modulus are obtained.

Abstract: This invention relates to a flame-retardant polyurethane spray system prepared by mixing at an isocyanate index of from 90 to 120(A) an isocyanate composition containing(a) an organic polyisocyanate, and(b) 0 to 50 wt. %, relative to the organic polyisocyanate, of a halogen-containing organic flame retardant; and(B) an isocyanate-reactive composition containing(a) 10 to 80 wt. % of an isocyanate-reactive compound having a molecular weight of 400 to 10,000 and functionality of 2 to 7;(b) 1 to 50 wt. % of an isocyanate-reactive compound having a molecular weight less than 399 and functionality of 2 to 6;(c) 0 to 15 wt. % of an isocyanate-reactive tertiary amine polyether having a molecular weight of 100 to 1000;(d) 5 to 55 wt.

Abstract: A process is provided for the production of polyaddition and polycondensation products, in which addition products of, on average, 0.5 to 2 moles of ethylene and/or propylene oxide with glycerol are polymerized with polyfunctional isocyanates or polybasic carboxylic acids or carboxylic acid esters a) directly or b) via the intermediate stage of transesterification products with esters of C.sub.1-4 alcohols and C.sub.2-22 fatty acids not including the esters of ricinoleic acid. The addition products of glycerol and ethylene or propylene oxide have been found to be a suitable replacement for trimethylolpropane in such reactions.

Abstract: The invention relates to a process for the solventless production of elastic filaments based on segmented poly(urethane)s or poly(urethane urea)s having improved thermal properties and, hence, improved processing behavior, for example during the heat setting of fabrics containing the elastic fibers, by the use of a polyisocyanate containing isocyanurate groups in the reaction of long-chain, relatively high molecular weight polyhydroxyl compounds with organic diisocyanates and low molecular weight diols and, optionally, other auxiliaries and additives in the melt, direct spinning of the reaction mixture thus obtained and thermal aftertreatment of the elastic filaments obtained and also to the filaments obtainable by this process.

Abstract: Aqueous polyurethane dispersions prepared in several stages by reactingA) aliphatic and/or aromatic di- and/or tri-isocyanates withB1) polyol mixtures containing dimer diols of 25 to 100% by weight of dimer diols and 0 to 75% by weight of other hydrophobic diols and/or polyols, the equivalent ratio of OH to NCO being 1:1.1 to 1:4, and simultaneously or subsequently withB2) chain-extending agents containing two terminal NCO-reactive groups, the chain-extending agents additionally containing either artionic or cationic groups or groups convertible into anionic or cationic groups by neutralization, the equivalent ratio of NCO-reactive groups to NCO groups theoretically still present after the reaction of A) with B1) being 1:0.

Abstract: A cyanate resin composition suitable for a copper-clad laminate comprises components (A) and (B).(A) a cyanate compound of the formula: ##STR1## wherein R and Q each represents halogen, C.sub.1-10 alkyl, C.sub.5-7 cycloalkyl or C.sub.6-20 hydrocarbon; i and j each represents 0-4 and M is (2): ##STR2## wherein T represents halogen, C.sub.1-10 alkyl, C.sub.5-7 cycloalkyl or C.sub.6-20 hydrocarbon; k represents 0-10 and m represents 0-8, and(B) a hardener.

Abstract: The present invention relates to an aldimine/aspartate corresponding to the formula ##STR1## wherein X represents an organic group which has a valency of n and is inert towards isocyanate groups at a temperature of 100.degree. C. or less,R.sub.1 and R.sub.2 may be the same or different and represent optionally substituted hydrocarbon radicals, or R.sub.1 and R.sub.2 together with the .beta.-carbon atom form a cycloaliphatic or heterocyclic ring andR.sub.3 and R.sub.4 may be identical or different and represent organic groups which are inert towards isocyanate groups at a temperature of 100.degree. C. or less,R.sub.5 and R.sub.6 may be identical or different and represent hydrogen or organic groups which are inert towards isocyanate groups at a temperature of 100.degree. C. or less, anda and b represent integers with a value of 1 to 5, provided that the sum of a and b is 2 to 6.

Abstract: This invention relates to a novel polyisocyanate based on polymethylene poly(phenylisocyanate), to a process for the production of a polyurethane backing on a substrate using this novel polyisocyanate to produce the polyurethane backing, and to the polyurethane backed substrate produced by this process. In particular, this novel polyisocyanate has a functionality of less than about 2.4, an isocyanate group content of 25 to 30%, and a urethane content of from about 2 to 6%, and comprises comprising polymethylene poly(phenylisocyanate), from about 5 to 25% of 4,4'-methylene bis(phenyloisocyanate), and from about 20 to 50% of 2,2'- and 2,4'-methylene bis(phenyl-isocyanate). This polyisocyanate can be reacted with a polyol mixture to produce the polyurethane backing on a substrate.

Abstract: Composite material produced from a first polyisocyanate-based mixture, from a second mixture comprising at least one ethylenically unsaturated monomer, at least one polyoxyalkylene polyamine and one ethylenically unsaturated polymer, and from a cross-linking catalyst. The first mixture comprises at least one polyisocyanate and at least one catalyst for reacting isocyanate functions with the ethylenically unsaturated polymer of the second mixture, and the second mixture comprises, for 100 parts by weight: 25 to 50 parts by weight of at least one ethylenically unsaturated monomer, 50 to 75 parts by weight of an unsaturated amine polyester resin which is the product of the reaction between (a) an unsaturated polyol polyester prepolymer and (b) a polyoxyalkylene amine, the weight ratio (a)/(b) being at least equal to 0.8, and as much as 4 parts by weight of at least one cross-linking catalyst. Application in the production of high modulus heat-resistant moulded articles.

Abstract: The invention relates to reaction products prepared from(a) organic polyisocyanates,(b) 0.005 to 0.9 equivalents of a C.sub.6-24 alcohol per equivalent of NCO or latent NCO present in component (a),(c) 0.1 to 0.995 mol of cyanamide per equivalent of NCO or latent NCO present in component (a), and(d) ammonia or a volatile amine as neutralizing agent for the cyanamide groups of component (c),with the proviso that the reaction products are free from polyester and polyether groups and from halogen atoms.

Abstract: An aqueous coating composition which is self-drying or is crosslinked by external agents, processes and dispersions for its preparation and its use.

Abstract: The invention provides polyurethane components and compositions capable of providing internal mold release properties in SRIM applications. The polyol composition of the invention has an isocyanate reactive polyol (A) having a number average molecular weight from 100 to about 10,000 and an effective amount of internal mold release composition (B) having a silicon-containing polymer (a) and an epoxidized ester (b). The invention further provides an SRIM polyurethane composition useful in the preparation of molded polyurethane articles having internal mold release properties, the composition comprising an isocyanate component (I) and the isocyanate reactive polyol composition (component (II)) disclosed above. In another aspect of the invention, the invention provides methods of using the claimed compositions as well as the rigid cellular polyurethane SRIM articles resulting from such processes.

Abstract: This invention is a method of making a laminated untreated fiberglass reinforced polyester substrates and a cured polyureaurethane adhesive composition. The prepolymer component of the adhesive is the reaction product of a slowly reacting polyisocyanate and a polyol.

Abstract: The addition of minor quantities of a hydroxyl-functional polyoxyalkylene monol to a PTMEG-derived isocyanate-terminated prepolymer during prepolymer preparation enables the preparation of glycol extended polyurethane elastomers which exhibit improved physical properties, particularly elongation, tensile strength, and tear strength, without significantly affecting elastomer hardness.