Abstract: The present invention is directed to a polyisocyanate mixture whichi) has an NCO content of 10 to 47% by weight,ii) is prepared from a mixture of 1,6-hexamethylene diisocyanate and a cyclic organic diisocyanate having (cyclo)aliphatically-bound isocyanate groups in a molar ratio of 10:90 to 90:10 andiii) contains isocyanurate and allophanate groups in a molar ratio of monoisocyanurates to monoallophanates of 10:1 to 1:5, wherein the allophanate groups are formed from urethane groups which are based on the reaction product of an organic diisocyanate having (cyclo)aliphatically bound isocyanate groups and a monoalcohol containing at least 1 carbon atom and having a molecular weight of up to 2500.The present invention is also directed to a process for the production of these polyisocyanate mixtures and to their use, optionally in blocked form, as an isocyanate component in two-component coating compositions.

Abstract: The present invention is directed to a polyisocyanate mixture having an NCO content of 10 to 47% by weight and a viscosity of less than 10,000 mPa.s and containing isocyanurate and allophanate groups in a molar ratio of monoisocyanurates to monoallophanates of 10:1 to 1:5, wherein the allophanate groups are formed from urethane groups which are based on the reaction product of an organic diisocyanate having (cyclo)aliphatic bound isocyanate groups and a monoalcohol containing at least 10 carbon atoms and having a molecular weight of 158 to 2500.The present invention is also directed to a process for the production of a polyisocyanate mixture having an NCO content of 10 to 47% by weight, having a viscosity of less than 10,000 mPa.s and containing isocyanurate and allophanate groups in a molar ratio of monoisocyanurates to monoallophanates of 10:1 to 1:5 bya) catalytically trimerizing a portion of the isocyanate groups of an organic diisocyanate having (cyclo)aliphatically bound isocyanate groupsb) adding 0.

Abstract: The present invention relates to a blocked polyisocyanate which is based on the reaction product of a polyisocyanate with a reversible, monofunctional blocking agent for isocyanate groups, wherein the polyisocyanate is prepared by trimerizing 5 to 85% of the isocyanate groups of a cyclic organic diisocyanate having (cyclo)aliphatically bound isocyanate groups and containsi) an isocyanurate group-containing polyisocyanate andii) at least 5% by weight, based on the weight of the polyisocyanate, of unreacted diisocyanate.The present invention also relates to a one-component coating composition containing this blocked polyisocyanate and a polyhydroxyl polyacrylate and/or a polyhydroxyl polyester.Finally, the present invention relates to substrates coated with this coating composition.

Abstract: The present invention is directed to a process for the production of a polyisocyanate composition having an NCO content of 10 to 47% by weight and a viscosity of less than 2,500 mPa.s, wherein the viscosity is determined from a mixture containing less than 1% by weight of the starting organic diisocyanate, and containing isocyanurate and allophanate groups in a molar ratio of monoisocyanurates to monoallophanates of 10:1 to 1:5 bya) catalytically trimerizing a portion of the isocyanate groups of an organic diisocyanate having (cyclo)aliphatically bound isocyanate groupsb) adding 0.01 to 0.

Abstract: The present invention is directed to a polyisocyanate composition which is dispersible in water, has an average NCO functionality of 2 to 6 and containsa) a polyisocyanate adduct prepared from 1,6-hexamethylene diisocyanate or a mixture of hexamethylene diisocyanate with up to 70% by weight, based on the weight of the diisocyanates, of another diisocyanate andb) at least 10% by weight, based on the weight of the polyisocyanate adduct, of an emulsifier which is based on the reaction product ofi) a monohydroxy functional polyether wherein the ethylene oxide portion of the polyether has a molecular weight of 200 to 1000 and the polyether has a total molecular weight of 200 to 1500 withii) either a polyisocyanate adduct which corresponds to component a) or another polyisocyanate.The present invention is also directed to a composition which contains this polyisocyanate compositions and an aqueous resin containing isocyanate-reactive groups.

Abstract: The present invention is directed for preparing a 4,4'-diisocyanato dicyclohexylmethane which contain a relatively high amount of the trans,trans-isomer. The process broadly comprises (a) melting a mixture of 4,4'-diisocyanato dicyclohexyl-methane isomers, (b) cooling the melted mixture to form: (1) a liquid phase and (2) a solid phase, (c) removing said liquid phase, which is a commercially viable product itself, (d) heating the solid phase and removing that portion of the solid phase which has melted, and (e) recovering that portion of said solid phase which has not melted by heating the remaining portion.

Abstract: The present invention is directed to a polyisocyanate mixture having an NCO content of 10 to 47% by weight and a viscosity of less than 10,000 mPa.s and containing isocyanurate and allophanate groups in a molar ratio of monoisocyanurates to monoallophanates of 10:1 to 1:5, wherein the allophanate groups are formed from urethane groups which are based on the reaction product of an organic diisocyanate having (cyclo)aliphatic bound isocyanate groups and a monoalcohol containing 1 to 5 carbon atoms.The present invention is also directed to a process for the production of a polyisocyanate mixture having an NCO content of 10 to 47% by weight, having a viscosity of less than 10,000 mPa.s and containing isocyanurate and allophanate groups in a molar ratio of monoisocyanurates to monoallophanates of 10:1 to 1:5 bya) catalytically trimerizing a portion of the isocyanate groups of an organic diisocyanate having (cyclo)aliphatically bound isocyanate groupsb) adding 0.01 to 0.

Abstract: The present invention is directed to coating compositions comprising a) polyisocyanates having a content of isocyanate groups blocked by blocking agents of about 10 to 35% by weight and containing about 0.5 to 10.0% by weight of structural units corresponding to the formula--CO--NH--NH--CO--and b) polyhydroxy polyacrylates in an amount sufficient to provide an equivalent ratio of blocked isocyanate groups to hydroxyl groups of about 0.5:1.0 to 2.0:1.0.The present invention is also directed to the coatings prepared from these coating compositions.Finally, the present invention is directed to blocked polyisocyanates which have a content of isocyanate groups blocked by blocking agents of about 10 to 35% by weight and about 0.5 to 10.0% by weight (calculated as --CO--NH--NH--CO--, MW 86) of structural units corresponding to the formula--CO--NH--NH--CO--Q--whereinQ represents NH--NH--CO-- or the group R--(CO--NH--NH--CO--).sub.nR is an n+1 valent hydrocarbon radical andn has a value from 1 to 3.

Abstract: The present invention is directed to coating compositions comprising a) polyisocyanates having a content of isocyanate groups blocked by blocking agents of about 10 to 35% by weight and containing about 0.5 to 10.0% by weight of structural units corresponding to the formula--CO--NH--NH--CO--and b) polyhydroxy polyacrylates in an amount sufficient to provide an equivalent ratio of blocked isocyanate groups to hydroxyl groups of about 0.5:1.0 to 2.0:1.0.The present invention is also directed to the coatings prepared from these coating compositions.Finally, the present invention is directed to blocked polyisocyanates which have a content of isocyanate groups blocked by blocking agents of about 10 to 35% by weight and about 0.5 to 10.0% by weight (calculated as --CO--NH--NH--CO--, MW 86) of structural units corresponding to the formula--CO--NH--NH--CO--Q--whereinQ represents NH--NH--CO-- or the group R--(CO--NH--NH--CO--).sub.nR is an n+1 valent hydrocarbon radical andn has a value from 1 to 3.

Abstract: A sliding door suspension system and a sliding door assembly for supporting a heavy sliding door from a door frame includes a rail horizontally mounted to the door frame. The suspension system includes a roller assembly which rollingly engages the rail and supports the heavy door. The roller assembly includes an axle or shaft having a bearing surface. The axle has at least one threaded end for securing the roller assembly and for attaching the roller assembly to a door hanger from which the heavy door is suspended. The roller assembly further includes a roller with a concentric hollow bore for seating a bearing assembly or bushing through which the axle extends in supportive engagement with the bearing assembly. The rail has a convex arcuate upper roller guide surface. The roller has a concave arcuate roller guide engaging surface which conforms to and engages the upper surface of the rail. The roller assembly also includes a door height and alignment adjusting member which threadably engages the axle.

Abstract: The present invention is directed to a coating composition which possesses improved storage stability and containsa) a blocked polyisocyanate prepared by blocking the isocyanate groups of an organic polyisocyanate with a blocking agent based on a di-C.sub.1 -C.sub.12 -alkyl and/or -alkoxyalkyl malonate or an acetoacetic acid C.sub.1 -C.sub.12 -alkyl and/or -alkoxyalkyl esterb) an aromatic polyamine, andc) is free from compounds having monofunctional reactivity towards isocyanate groups.

Abstract: The present invention is directed to a simple process for preparing a 4,4'-diisocyanato dicyclohexylmethane containing at least 90% by weight of the trans, trans-isomer. More particularly, the process comprises:(a) melting a mixture of 4,4'-diisocyanato dicyclohexylmethane isomers containing at least 30% by weight, and preferably from 45 to 55% by weight, of the trans,trans-isomer,(b) cooling the melted mixture to a temperature of from about 20.degree. to about 25.degree. C.

Abstract: Labeling machine of the stack fed type in which the labels are precut and arranged vertically in a horizontal stack. Pressure is applied to the rear of the stack to move the stack forwardly as the labels are dispensed to a label transfer mechanism such as a vacuum drum. Air is blown into the stack from the bottom at the forward end of the stack to separate the foremost label, which is picked up from the stack by a rotating vacuum wheel.

Abstract: The present invention is directed to the stabilization of a prepolymer based on methylene diphenyl isocyanate rich in the 2,4'-isomer. It was surprisingly found that the color stability, viscosity and aging characteristics of the prepolymer are improved markedly upon the incorporation therewith of a combination of a certain epoxide compound and a hindered phenol.

Abstract: Aliphatic and/or cycloaliphatic polyisocyanates containing allophanate groups are produced by reacting (a) a di- and/or polyisocyanate with aliphatic and/or cycloaliphatic isocyanate groups with (b) a hydroxy compound at a temperature of at least 150.degree. C. for no more than 90 minutes and then rapidly cooling the reaction mixture to a temperature of less than 100.degree. C. It is preferred that the reaction be carried out in the absence of oxygen. The products thus obtained are virtually colorless, have a relatively low viscosity and excellent storage stability.

Abstract: The present invention relates to coating compositions based on polyurethane polymers and melamine- and/or urea-formaldehyde resins as cross-linking agents. At least a portion of the chain lengthening agent used to prepare the polyurethane polymers is based on 2,2-bis(hydroxymethyl)propionic acid amide. By using this particular chain lengthening agent, the coating composition can be applied to textile substrates by the direct or reverse coating process and curved at lower temperatures.The present invention additionally relates to the preparation of these coating compositions and to their use as the adhesive coat in preparing coated textile substrates by the direct or reverse coating process.

Abstract: The present invention relates to coating compositions comprising (i) an isocyanate prepolymer based on bis(4-isocyanatocyclohexyl)methane and polyalkylene ether polyols having hydroxyl functionalities of 2 to 3 and (ii) at least one diprimary aromatic diamine having at least one alkyl substituent in an ortho-position to one amino group and two alkyl substituents in both ortho-positions to the other amino group.

Abstract: The present invention is directed to aqueous solutions or dispersions which may contain blocked polyisocyanates of cationic oligourethanes which are crosslinkable at elevated temperature and contain(a) about 0.1 to 3% by weight of ternary or quaternary ammonium ions introduced through Michael adducts of secondary amines having at least one hydroxyl group and specific acrylic acid derivatives,(b) up to about 2.8% by weight of tert. amino nitrogen atoms incorporated through Michael adducts of secondary amines having at least one hydroxyl group and specific acrylic acid derivatives and(c) about 0 to 15% by weight of blocked isocyanate groups, provided that the ternary ammonium groups of (a), the tert. nitrogen atoms of (b) and the blocked isocyanate groups are present in an equivalent ratio of (a+b):blocked isocyanate groups of about 1:1 to 1:1.5.

Abstract: The present invention is directed to oligourethanes which are stable in storage at room temperature and either self cross-linking at elevated temperatures or capable of being cross-linked with organic polyisocyanates which may have at least partially masked isocyanate groups,(a) containing about 0.1 to 3% by weight of tertiary amine nitrogen atoms in the form of structural units corresponding to the following formula attached through urethane groups either in end positions and/or within the molecule: ##STR1## wherein R.sup.1 represents hydrogen or an alkyl group having 1 to 4 carbon atoms,R.sup.2 represents --C.tbd.N, --CO--NH.sub.2 --, --CO--NHR.sup.3, --CO--NR.sub.2.sup.3 or --COOR.sup.3 andR.sup.3 represents a monovalent hydrocarbon group optionally carrying inert substituents,(b) up to about 15% by weight of isocyanate groups and(c) up to about 15% by weight of masked isocyanate groups.

Abstract: The present invention relates to a process for the production of organic polyisocyanates containing at least partly blocked isocyanate groups characterized in that specific cyclic dicarbonyl compounds are used as the blocking agent. The present invention also relates to the polyisocyanates containing at least partly blocked isocyanate groups obtainable by this process and to the use of the polyisocyanates containing at least partly blocked isocyanate groups obtainable by this process as reactants for isocyanate-reactive compounds for the production of isocyanate polyaddition products.The present invention also relates to the use of polyisocyanates containing at least partly blocked isocyanate groups obtainable by the above process for the production of aqueous stoving lacquers and to the use of these polyisocyanates for the production of aqueous polyisocyanate solutions or dispersions.