Abstract: Polyurethane prepolymers having free isocyanate groups are treated with polyfunctional isocyanate-blocking agents to cause branching prior to or simultaneously with the addition of a curing diol. The composition containing the curing diol is molded in a conventional equipment at a conventional temperature, e.g., 100.degree.-120.degree.C. The resulting shaped article can be demolded in a fraction of the time required in the absence of the blocking agent. The shaped article is then post-cured within a temperature range of about 25.degree.-150.degree. C., during which time the curing diol, if present in sufficient amount, displaces the blocking agent and forms a cured, linear polyurethane. A typical suitable blocking agent is a substantially uncrosslinked phenol/formaldehyde resin. The curable composition can be prepared in one step from the diisocyanate, glycol, and blocking agent; and a composition containing all the components, including the curing diol, can be prepared in one or more steps.

Abstract: The present invention relates to an aqueous thermosetting coating composition comprising (A) a cationic thermosetting urethane resin, (B) a water-insoluble resol-type phenolic resin, (C) an acid as a neutralizing agent and (D) water as a diluent.

Abstract: A method is provided for coating a vulcanized polyalkylene rubber with a composition which contains an ethylenically unsaturated polyurethane binder containing active hydrogen atoms with a cross-linking agent for the polyurethane and a free radical initiator.The polyurethane binder is prepared by reacting an organic polyhydroxy compound, an acrylic or methacrylic hydroxy ester and an organic diisocyanate and reacting the resulting reaction product with a polyamine or alkanol amine.

Abstract: This invention relates to a process for the preparation of a finely divided, stable and relatively low viscosity dispersion of a polyisocyanate polyaddition product and an aminoplast and/or phenoplast and/or copolymer thereof in a hydroxyl containing compound and the use of such a dispersion as the starting component for the production of a polyurethane resin.

Abstract: A heat transfer comprising a temporary support and a label carried on the support. The label comprises a layer of a polyurethane resin system which includes a polyurethane obtained by reaction of a diphenyl isocyanate, a free glycol and a polyester either of the formula ##STR1## wherein R is an alkylene radical of 2 to 8 carbon atoms and R.sup.1 is an alkylene radical of 4 to 10 carbon atoms or of the formula ##STR2## wherein R.sup.11 is an alkylene radical of 4 to 8 carbon atoms. The polyurethane resin system further includes a cross-linking agent and a catalyst so that when the label is placed in contact with an article to be marked and subjected to heat and pressure, the resin system is converted to an inert insoluble and wear resistant form and a substantially permanent marking is produced on the article.

Abstract: Storage-stable, one-part, curable resin systems containing a latent Lewis acid catalyst which can be activated by applying mechanical force to the system.

Abstract: An improved electrocoating composition can be produced by first reacting an isocyanate terminated prepolymer with a minor amount of peroxide to provide a polyurethane polymer blocked with pendant peroxide groups, and then coreacting acrylic monomers with minor amounts of other ethylenically unsaturated monomers in the presence of the preformed polyurethane-peroxide polymer to provide polyurethane copolymer with said monomers. The resulting polyurethane acrylic block copolymer can contain carboxyl or amine groups for dispersing into a dilute aqueous solution and provide an anodic or cathodic electrocoating composition.

Abstract: A textile finishing composition comprises a water dispersible urethane prepolymer and a water soluble methylol compound, a glyoxalamide adduct, or bis(.beta.-hydroxyethyl) sulfone.

Abstract: A polymer composite material which comprises a first rigid polymeric material composed substantially of rigid molecular chains having an average chain length of 50 A or more, and a second polymeric material composed substantially of flexible molecular chains, wherein said first rigid polymeric material is present in an amount of 20% or less based on the total weight of polymeric material in said composite and said first material is uniformly dispersed in said second polymeric material in a microscopic region of 1 .mu.m or less.

Abstract: The present invention relates to a process for the preparation of aqueous dispersions or solutions of polyurethanes which have urea end groups and contain non-ionic hydrophilic segments and which are capable of being cross-linked with the aid of cross-linking agents which are reactive with urea groups, characterized in that prepolymers which have isocyanurate end groups and which(i) have an average molecular weight of less than about 15,000 and(ii) contain from about 2 to 30%, by weight, of ethylene oxide units corresponding to the following formula:--CH.sub.2 --CH.sub.2 --O--within a polyether chain (containing ethylene oxide units)are reacted at from about 10.degree. to 70.degree. C.

Abstract: A thermosetting coating composition comprising the organic solvent-soluble reaction product formed by contacting at an elevated temperature at least one blocked isocyanate-functional urethane and at least one organic solvent-soluble phenolic resin, and, optionally, at least one blocked isocyanate-functional urethane. The compositions are storage-stable for extended periods and cure to a thermoset state to afford tough, durable, flexible finishes which are resistant to cracking, staining, and marring.

Abstract: A latex suitable for forming improved water-resistant polyurethane products. The latex is prepared in an aqueous system by reacting an NCO-terminated, quaternized, preferably linear, polyurethane prepolymer with water and chain-extending the resulting polyurethane-urea with a difunctional or polyfunctional reagent containing groups reactive with primary amino groups, such as epoxy groups, anhydrides and aldehydes, thus increasing the molecular weight of said polyurethane-urea. The latex thus formed can be dried into highly water-resistant films, coatings, and the like.