Abstract: The present invention relates to a process for preparing leather by (I) tanning a pelt with (a) an aldehyde, or (b) a bisulphite-blocked polyisocyanate; (II) optionally, retanning the pelt with (a) a polyaspartic acid, a salt of a polyaspartic acid, a polyaspartic acid anhydride, or a mixture thereof, and/or (b) a polyaspartamide; (III) dressing the resultant product by (a) bottoming the product with a polyurethane and one or more natural bottoming assistants, and (b) applying a polyurethane and/or polyesteramide finish; and (IV) optionally, aftertreating the resultant dressed leather with a leather preservative.

Abstract: The novel AOX-free process for imparting wet strength to paper with water-dispersible polyisocyanates is distinguished by a good wet-strength effect, even under mild drying conditions, and does not affect the activity of optical brighteners used at the same time.

Abstract: The present invention relates to aqueous polyurethane dispersions having a resin solids content of 20 to 60 wt %, a viscosity at 23.degree. C. of 10 to 20,000 mPa.s and a pH of 5.5 to 8.5, wherein the polyurethane has a weight average molecular weight of 5,000 to 500,000 and a urethane group content (calculated as --NHCO--O--, molecular weight=59) of 2.5 to 15 wt %, and is based on a polyisocyanate component containing 50 to 100 wt % of 1-methyl-2,4- and/or -2,6-diisocyanatocyclohexane.The present invention also relates to aqueous binder compositions containing these aqueous polyurethane dispersions and known crosslinking resins and to the use of the aqueous polyurethane dispersions and aqueous binder compositions as binders for glass fiber sizings.

Abstract: The present invention relates to a process for preparing an isocyanate group-containing allophanate corresponding to formula (I) ##STR1## wherein R represents the residue obtained by removing the isocyanate groups from a (cyclo)aliphatic or araliphatic diisocyanate,Y represents the represents an m-valent residue obtained by removing the hydroxyl groups from a (poly)hydroxyl compound having m OH groups andn and m are the same or different and have a value of 1 to 5, by reacting an isocyanate group-containing oxadiazinetrione with a primary alcohol in the presence of a basic catalyst having a pKa value of >6.

Abstract: Bisulphite-blocked, polyether-modified polyisocyanates are outstandingly suitable, in combination with mineral tanning agents, for the tanning of leather.

Abstract: The invention relates to a new process for the preparation of cellulose-containing material provided with a dry-strength and wet-strength finish and/or sized, characterised in that the cellulose-containing material is treated with a water-dispersible polyisocyanate mixture (I), which contains tertiary amino and/or ammonium groups, optionally polyether units and optionally hydrophobic groups.

Abstract: The invention relates to a blocked polyisocyanate having an NCO functionality of from 2.2 to 4.5 and an average molecular weight of 800 to 25,000 and containing (1) blocked isocyanate groups corresponding to an NCO content of 5 to 20 wt. % calculated as free NCO, relative to unblocked polyisocyanate, (2) 1 to 75 meq of ionic groups per 100 g of blocked polyisocyanate, and (3) 3 to 40 wt.

Abstract: The present invention relates to tanning agents containing carbamoyl sulfonate groups that are prepared by the reaction of(A) organic polyisocyanates,(B) 0.01 to 0.4 equivalents, relative to the isocyanate groups of polyisocyanate (A), of polyether alcohols having incorporated polyalkylene oxide units (the equivalents of the polyether alcohol being based on the hydroxyl groups), wherein 40 to 100 mole-% of the polyalkylene oxide units consist of polyethylene oxide units having a sequence length of 5 to 70,(C) optionally, NCO-reactive components other than polyether polyol (B), and(D) ammonium or alkali bisulfites or disulfites.

Abstract: The present invention relates to a method for textile printing with aqueous dispersions in which an organic fixing agent is crosslinked with a blocked polyisocyanate having (i) an average molecular weight of about 800 to about 25,000, (ii) a content of blocked isocyanate groups, calculated as free NCO and based on non-blocked polyisocyanate, corresponding to an NCO content of about 5 to about 20% by weight, (iii) an ionic group content of about 1 to about 75 milliequivalents per 100 g of blocked polyisocyanate, and (iv) a content of polyalkylene oxide units of about 1 to about 20% by weight, based on blocked polyisocyanate, said blocked polyisocyanate being obtained by the reaction of(a) organic polyisocyanates,(b) isocyanate-reactive compounds containing (potential) ionic groups,(c) polyalkylene ether alcohols,(d) NCO blocking agents, and(e) optionally, isocyanate-reactive compounds that are different from components (b), (c), and (d).

Abstract: The present invention relates to textile printing pastes containing modified polyisocyanates, modified polycarbodiimides, or trifunctional polyepoxides as crosslinking agents for the binders present therein.

Abstract: The invention relates to a blocked polyisocyanate having an NCO functionality of from 2.2 to 4.5 and an average molecular weight of 800 to 25,000 and containing (1) blocked isocyanate groups corresponding to an NCO content of 5 to 20 wt. % calculated as free NCO, relative to unblocked polyisocyanate, (2) 1 to 75 meq of ionic groups per 100 g of blocked polyisocyanate, and (3) 3 to 40 wt.

Abstract: The invention relates to a new process for the preparation of cellulose-containing material provided with a dry-strength and wet-strength finish and/or sized, characterized in that the cellulose-containing material is treated with a water-dispersible polyisocyanate mixture (I), which contains tertiary amino and/or ammonium groups, optionally polyether units and optionally hydrophobic groups.

Abstract: Polyols are conditioned and stabilized by mixing them at 0 to 150.degree. C. with from about 0.0001 to about 1% by weight, based on the quantity of polyol, of a silylated acid corresponding to the formula:X--[Si(CH.sub.3).sub.3 ].sub.nin whichX represents a neutral acid residue obtained by removal of the acidic hydrogen atoms from an n-basic acid having a maximum pKa value of 3, provided that the n-basic acid is not a hydrohalic acid andn represents an integer of from 1 to 3.The resultant polyol is characterized by good color and activity properties. The stabilized polyols are particularly useful in the production of polyurethanes, particularly polyurethane foams.

Abstract: The present invention relates to an aqueous two-component coating composition wherein the binder contains(a) a component which is dissolved and/or dispersed in water, has an average hydroxyl number of 15 to 200 mg KOH/g, and contains(a1) a polyol component having a content of 8 to 450 milliequivalents, per 100 g of component (a1) solids, of chemically incorporated ammonium groups, .dbd.N.dbd..sup.+, comprising one or more polyaddition resins which are water-dilutable, contain hydroxyl groups, and have a molecular weight (M.sub.n) of 500 to 20,000 and(a2) up to 10 wt %, based on the weight of component (a1), of one or more reactive diluents which are water-soluble, have a molecular weight (M.sub.

Abstract: Textiles can be finished in a wash- and cleaning-resistant manner by impregnation if aqueous dispersions are employed for this purpose which contain reactive copolymers and/or cocondensates having perfluoroalkyl groups and water-dispersible polyisocyanate mixtures whose NCO groups are not blocked.

Abstract: Microcapsules can be prepared in an energy-saving manner by using a polyisocyanate which consists exclusively or partially of reaction products of isocyanates having a functionality of 2 or more with polyethylene oxide alcohols.

Abstract: The present invention relates to a coating composition which containsA) 100 parts by weight of a water-soluble polyether component having an average hydroxyl functionality of least 2.5 and an average OH number of 100 to 600 and containing at least one polyether polyol,B) 40 to 240 parts by weight of a water-soluble or water-dispersible polyisocyanate component containing at least one nonionically/hydrophilically modified organic polyisocyanate having (cyclo)aliphatically bound isocyanate groups,C) 10 to 50 parts by weight magnesium oxide and/or hydroxide in finely dispersed form andD) 50 to 150 parts by weight water.The present invention also relates to mineral substrates coated with this coating composition.

Abstract: The present invention relates to polyisocyanates containing tertiary nitrogen with an (average) NCO functionality of 2.3 to 4.3 which, despite the presence of tertiary nitrogen and isocyanate groups in the same molecule, would be stable in storage, could be dissolved or dispersed in water without difficulty, optionally after at least partial alkylation or protonation, and would be suitable as starting components in the production of polyurethane plastics and, above all, as crosslinking agents for water-containing binders or binder components.

Abstract: This invention relates to a process for the preparation of N,N-disubstituted mono- and oligourethanes by the reaction of N-aromatically, N-aliphatically, N-cycloaliphatically, and N-araliphatically substituted mono- and oligourethanes with dialkyl carbonates in the presence of at least stoichiometrically equivalent quantities of solid alkali or alkaline-earth carbonate in excess dialkyl carbonate and/or an aprotic organic solvent and in the presence of a phase transfer catalyst.

Abstract: Process for the preparation of stable dispersions of hydrophobic reagents in aqueous material, which process involves dissolving an ionomeric polymer, together with hydrophobic reagent substance, in a suitable organic solvent, adding water to the resulting material and then removing the organic solvent. The resulting dispersion has exceptionally high stability and finds utility in the production of diagnostic reagent test devices.