Abstract: The invention relates to non-crystallising, amine-blocked polyisocyanates, to the preparation thereof and to their in one-component polyurethane stoving compositions, in particular for coil-coating applications.

Abstract: This invention relates to polyisocyanates which are partially or completely blocked with 3,5-dimethyl-1,2,4-triazole, to heat curable, one-component coating compositions containing these blocked polyisocyanates and to the resulting coatings.

Abstract: The present invention relates to aqueous polyurethane coating compositions wherein the binder containsa) a polyol component, which is soluble or dispersible in water and is the reaction product of a polyisocyanate component containing 50 to 100 wt. % of 4,4'-diisocyanatodicyclohexylmethane, a polyol component containing one or more polyether polyols and having an OH number of 25 to 350 mg KOH/g solids and an isocyanate-reactive component containing at least one group capable of salt formation andb) a polyisocyanate component, which is soluble or dispersible in water, has blocked isocyanate groups and is the reaction product of a polyisocyanate having an isocyanurate group content of 2 to 30 wt.

Abstract: A new process for the production of high purity (cyclo)aliphatic diurethanes from (cyclo)aliphatic diamines, alcohols and urea in a multistep reaction in which (1) urea is reacted with alcohol with elimination of ammonia, (2) diamine is then introduced into the reaction mixture, optionally in the form of a solution in alcohol, and reacted with continuous release of ammonia and (3) the reaction mixture is freed from volatile components by distillation. The diurethanes produced by this process are useful as starting materials for the production of the corresponding diisocyanates by thermal urethane cleavage.

Abstract: The invention relates to a method for coating textiles and/or leather with an aqueous dispersion comprising(A) a mixture of(i) a urethane-containing blocked NCO prepolymer having a number average molecular weight of 2000 to 10,000, a content of blocked isocyanate groups (calculated as NCO) of 0.5 to 5 wt. %, an ethoxy group content of 2 to 50 wt. %, an ionic group content of 5 to 30 meq per 100 g of the prepolymer, and(ii) a polyamine having (cyclo)aliphatically bonded primary and/or secondary amino groups,wherein the equivalent ratio of blocked NCO groups of component (i) to amino groups of component (ii) is 1:0.9 to 1:1.2, and(B) an aqueous phase.

Abstract: The present invention relates to novel aqueous or water-dilutable blocked polyisocyanates and to their use for the production of one-component polyurethane coating compositions, which are stovable at relatively low temperatures of 130.degree. to 150.degree. C. and provide clear coatings having substantially reduced thermal yellowing.

Abstract: Polyisocyanates which have 1,2,4,-triazole-blocked isocyanate groups and a blocked isocyanate group content of 7 to 14 wt. % and which are reaction products ofA) a polyisocyanate component selected from (i) lacquer polyisocyanates based on (cyclo)aliphatic diisocyanates or (ii) mixtures of these lacquer polyisocyanates with cycloaliphatic diisocyanates of a maximum molecular weight of 300,B) 50 to 80 equivalent-%, based on the isocyanate groups of component A), of a monofunctional isocyanate group blocking agent containing at least 90 wt. % of 1,2,4-triazole,C) 10 to 30 equivalent-%, based on the isocyanate groups of component A), of a polyester component having an OH number of 56 to 250 andD) 0 to 20 equivalent-%, based on the isocyanate groups of component A), of selected hydrazine derivatives.The present invention is also directed to the use of these blocked polyisocyanates as crosslinking agents in one-component polyurethane stoving lacquers.

Abstract: This invention relates to solvent-free two-component polyurethane reactive adhesives comprising(A) a polyisocyanate component based on diphenylmethane diisocyanates,(B) a water-containing polyol component having a maximum of three OH groups, a water content of 0.25 to 2.0 wt. %, and an OH value of 300 to 600, and optionally(C) auxiliary substances and additives,wherein component (A) and component (B) are present in proportionate amounts such that the isocyanate index is 120 to 250. These adhesives are used for producing sandwich-type interior panelling for vehicles.

Abstract: The present invention relates to heat curable coating compositions containing a binder consisting essentially ofA) prepolymers which have butanone oxime-blocked isocyanate groups and are prepared fromA1) (cyclo)aliphatic polyisocyanates andA2) an organic polyhydroxyl component in whichA2.1 ) 50 to 90% of the hydroxyl equivalents of component A2) are from polyester polyols,A2.2) 10 to 50% of the hydroxyl equivalents of component A2) are from polyacrylate polyols and/or alkoxylation products of bisphenol A andA2.3) 0 to 30 of the hydroxyl equivalents of component A2) are from other organic polyhydroxyl compounds, andB) cycloaliphatic polyamines having at least two primary amino groups,wherein components A) and B) are present in an equivalent ratio of blocked isocyanate groups to amino groups of 1:0.8 to 1:1.2.The invention also relates to the use of these coating compositions for producing decorative, flying-stone-resistant, thick topcoats on metallic substrates.

Abstract: Blocked (cyclo)aliphatic polyisocyanates wherein 30 to 70 equivalent-% of the isocyanate groups are blocked with butanone oxime, 30 to 70 equivalent-% of the isocyanate groups are blocked with 1,2,4-triazole and 0 to 30 equivalent-% of the isocyanate groups are blocked with other blocking agents; a method for their preparation by blocking lacquer polyisocyanates with these blocking agents, optionally with the prior, simultaneous or subsequent modification of the polyisocyanates with hydrazine derivatives containing one or more isocyanate-reactive groups; and the use of the blocked polyisocyanates as cross-linking agents for organic polyhydroxy compounds in one-component polyurethane stoving compositions.

Abstract: Isocyanate prepolymers based on an aromatic diisocyanate and a polyether polyol in which at least 95% of the isocyanate groups are blocked by blocking agents selected fromA) about 50 to about 97 equivalent % of a phenol or substituted phenol,B) about 30 to about 50 equivalent % of a pyrazole or a substituted pyrazole andC) 0 to about 10 equivalent % of a blocking agent different from A) and B).These blocked isocyanate prepolymers are particularly useful for the production of flexible epoxy resin systems.

Abstract: The present invention relates to a thermosetting coating composition based on a binder composition containingA) prepolymers containing isocyanate groups blocked with .epsilon.-caprolactam, having an average molecular weight of 1000 to 10,000 and prepared fromA1) aromatic polyisocyanates andA2) a component containing at least one organic compound having hydroxyl groups wherein 50 to 100 hydroxyl equivalent percent of component A2) is based on polyesters containing hydroxyl groups and 0 to 50 hydroxyl equivalent percent is based on polyhydroxyl compounds which are free from ester groups andB) a hardener component containing at least one cycloaliphatic polyamine having at least two primary amino groups,in an equivalent ratio of blocked isocyanate groups to amino groups of 1:1 to 1:1.5.The invention also relates to use of the coating compositions to produce stoving-resistant gravel-proof primer coatings on optionally pretreated metal substrates.

Abstract: The present invention relates to organic polyisocyanates which have a content of unblocked and blocked isocyanate groups (calculated as NCO) of 5 to 20 wt.%, preferably 7 to 15 wt.%, wherein at least 95%, preferably 100%, of the isocyanate groups are present in blocked form and wherein the blocking agent containsA) 30 to 70 equivalent-% of diisopropylamine,B) 30 to 70 equivalent-% of at least one other blocking agent selected from CH-acidic esters and 1,2,4-triazole andC) 0 to 20 equivalent-% of blocking agents other than those set forth in A) and B),wherein the percentages of A), B) and C) add up to 100.The present invention also relates to a process for the production of these organic polyisocyanates and their use as crosslinking agents for organic polyhydroxyl compounds in polyurethane coating compositions.

Abstract: Open-celled, cold-formable polyurethane foams are made by reacting a specific crude MDI with a polyol component which includes hydroxyl polyethers having an OH number of from about 28 to about 600, a difunctional phthalic acid hydroxyl polyester having an OH number of from about 150 to about 440, glycerol, a blowing agent (water is preferred), a tertiary amine catalyst and optionally a silicone foam stabilizer. These foams generally have a density of from about 23 to about 30 kg/m.sup.3 and may be molded into articles having intricate shapes (e.g., roof for automobiles) using known cold-forming techniques.

Abstract: This invention relates to a process for the preparation of compression molded materials comprising compressing a substrate with a binder based on polyisocyanates, wherein said binder comprises polyisocyanates, compounds containing at least two isocyanate reactive hydrogen atoms, and alkylene carbonates.

Abstract: The preparation and use of polyurethane-based hot melt adhesives which are cross-linked under the influence of heat comprising reacting(a) a polyisocyanate component containing at least one organic polyisocyanate with(b) a polyol component containing(b1) at least one organic polyhydroxyl compound having a hydroxyl number of 50 to 400 and optionally(b2) at least one organic polyhydroxyl compound having a hydroxyl number above 400 used in a quantity of 0 to 100 hydroxyl equivalents percent, based on component (b1), optionally with the addition of(c) auxiliary agents and additives conventionally used in polyurethane chemistry and/or the technology of adhesives is disclosed.The reaction is characterized in that the equivalent ratio of isocynate groups of component (a) to all the isocyanate reactive groups present in component (b) is from 1:1 to 1.

Abstract: Thermoformable rigid foams are made by reacting an organic polyisocyanate with a polyol component. The polyol component includes at least one organic polyhydroxyl compound having a hydroxyl number of from 28 to 1200, a foaming agent, a catalyst and a compound which masks isocyanate groups. Preferred isocyanate masking compounds are .epsilon.-caprolactam and nonyl phenol. The foam thus obtained may then be molded and crosslinked by heating it to a temperature of from 150.degree. to 190.degree. C. These foams are particularly useful as interior trim for motor vehicles.

Abstract: The invention relates to low-solvent, thermosetting reactive polyurethane coating compositions which are particularly resistant to light, oxidation and hydrolysis, do not crystallize or harden and comprise the following components:(A) a ketoxime-blocked NCO-prepolymer of1. 1 mole of 2- to 4-functional, relatively high molecular weight polyhydroxyl compounds comprising a polyester polycarbonate based on ester glycols of .epsilon.-caprolactone and 1,6-hexane diol;2. about 0.1 to 1.2 moles of low molecular weight polyols containing bis-carbazinic ester polyols corresponding to the following general formula ##STR1## in which R is a straight-chain and/or branched C.sub.1 -C.sub.5 -alkylene or hydroxyl-substituted alkylene radical, and low molecular weight diols and triols preferably containing tertiary amino groups, and3. aliphatic and/or cycloaliphatic diisocyanates in an NCO/OH ratio of from about 1.5:1 to 6:1 and4.

Abstract: This invention relates to a mixture which is stable in storage in the absence of moisture and comprises the following:(a) polyurethane prepolymers containing incorporated tertiary nitrogen atoms, structural units corresponding to the following formula:--O--CH.sub.2 --C(CH.sub.3).sub.2 --CH.sub.2 --O--and terminal isocyanate groups,(b) aromatic or aliphatic orthophosphoric acid esters;(c) one or more inert solvents, and(d) optionally other auxiliaries and additives, and to the use of these mixtures as adhesives or coatings for flexible or rigid substrates.

Abstract: The present invention relates to lacquer polyisocyanates which contain about 0 to 8% free isocyanate groups, about 10 to 28% blocked isocyanate groups and about 2 to 10% of the structural units, --NH--NH--CO--O, all percentages based on the weight of the polyisocyanates, but excluding the weight of the blocking agent. Also provided is a process for preparing these polyisocyanates which comprises reacting about 10 to 30 mol % of the isocyanate groups of an organic polyisocyanate with reaction products which have (i) alcoholic hydroxyl groups and (ii) structural units of the formula, --O--CO--NH--NH--CO--O--, and/or of the formula H.sub.2 N--NH--CO--O--, with the formation of urethane groups and optionally groups corresponding to the formula, --NH--NH--CO--O--, and reacting about 50 to 90 mol % of the isocyanate groups of the organic polyisocyanate with a blocking agent.