Abstract: This invention relates to novel liquid, homogeneous toluene diisocyanate/polyether/polymethylene poly(phenylisocyanate) prepolymers having an NCO content of from about 2 to 16%, a viscosity or about 10,000 mPa.s or less at room temperature, and which contains about 1.0% or less of free monomeric TDI. This invention also relates to a process for the preparation of these liquid, homogeneous toluene diisocyanate/polyether/-polymethylene poly(phenylisocyanate) prepolymers.

Abstract: This invention relates to a process for the production of polyurea encapsulated fertilizer particles. These are produced by applying an isocyanate-reactive component which contains at least two amine groups to fertilizer particles to form amine coated particles, and applying a polyisocyanate component to the amine coated particles to form polyurea coated particles. These steps may optionally be repeated in successive order. The resultant polyurea encapsulated fertilizer particles contain from about 0.5 to 15% by weight of polyurea, based on the total weight of the encapsulated fertilizer particles. Instead of using an amine group containing isocyanate-reactive component, water can be applied first.

Abstract: This invention relates to novel liquid toluene diisocyanate/polyether/polymethylene poly(phenylisocyanate) prepolymers having an NCO content of from about 2 to 20%, a viscosity or about 10,000 mPa.s or less at 25.degree. C., and which contains about 1.0% or less of monomeric TDI. This invention also relates to a process for the preparation of these liquid toluene diisocyanate/polyether/polymethylene poly(phenylisocyanate) prepolymers.

Abstract: The present invention relates to non-sagging, light stable polyurethane compositions. These non-sagging, light stable polyurethane compositions are the reaction product of a liquid hexamethylene diisocyanate adduct with a mixture of an organic compound containing hydroxyl groups, an aliphatic and/or alicyclic diamine, and an alkanolamine. It also relates to a process for producing these non-sagging, light stable compositions, and their use as seam sealants.

Abstract: The present invention relates to highly elastic polyurethane contact adhesives, a process to coat substrates with these contact adhesives, and the coated substrates produced by this process. This invention requires a) a polyisocyanate with a functionality of less than about 4 and b) a polyol blend comprising 1) about 90 to 100% polyethers with molecular weights from about 1,800 to 12,000 and average functionality from about 1.5 to about 4, and 2) up to about 10% of chain extenders with molecular weights from about 60 to 400 and average functionality from about 1.5 to about 3. The functionalities and amounts of components a) and b) are such that the molecular weight between crosslinks is from about 7,000 to about 16,000 and the equivalent ratio of isocyanate groups to isocyanate-reactive groups is from about 80:100 to about 120:100 and the urethane group content is from about 1 to about 8%. It is preferred that at least one of components a) and b) have a functionality of greater than about 2.2.

Abstract: The present invention relates to polyurethane layers having higher surface energy. These polyurethane layers are formed on a substrate from a reactive mixture, and comprised of A) a compound containing isocyanate groups, B) an organic compound containing isocyanate-reactive groups, and C) at least one material selected from the group consisting of 1) reactive non-ionic polar materials, 2) reactive ionic polar materials, 3) non-reactive polar materials, and 4) mixtures thereof. Polyurethane layers such as these have been found to have improved adhesion and wet-out properties when used as precoat layers for carpet backing.

Abstract: The present invention is directed to a non-aqueous, base-degradable polyurethane. The polyurethane is prepared by reacting an organic polyisocyanate with a hydroxyl group containing hydrophilic composition. The hydrophilic composition must have specified amounts of ionic or acidic groups and specific amounts of polyester groups. In a preferred embodiment, the hydrophilic composition also contains polyoxyethylene groups.

Abstract: This invention relates to thermoformable polyurethanes prepared by the reaction, at a isocyanate ratio of from 0.8:1 to 1.5:1, of(a) aliphatic or cycloaliphatic polyisocyanates,(b) 45 to 95 equivalent percent, relative to component (a), of a polyester, polycarbonate, and/or polyester carbonate diol having a molecular weight of from 2000 to 5000,(c) 5 to 40 equivalent percent, relative to component (a), of one or more diols having an average molecular weight of from 90 to 530,(d) optional catalysts, and(e) optional fillers,wherein the thermoformable polyurethane is hard, flexible, and opaque at room temperature but softens and becomes formable and, if free of opaque fillers, clear upon heating to a temperature of less than 100.degree. C.

Abstract: The present invention relates to a method for adhering two or more substrates by(1) applying to a surface of one of said substrates a non-sagging polyurea adhesive composition comprising the reaction product of:(a) a polyphenyl polymethylene polyisocyanate or a urea-modified prepolymer thereof and(b) an isocyanate-reactive component comprising amines consisting essentially of(i) an aminocrotonate-terminated polyether containing at least two secondary amino groups prepared by reaction of a polyfunctional acetoacetylated polyether polyol with a primary monoamine, and(ii) a low molecular weight aromatic and/or aliphatic diamine, and(2) contacting said substrate with a surface of a second substrate, and(3) curing the polyurea adhesive composition.

Abstract: The present invention relates to a process for repairing plastic parts with non-sagging, sandable polyurethane compositions. These compositions are prepared by mixing A) a liquid polyisocyanate having an isocyanate content of from about 10 to 50% by weight; B) a liquid isocyanate-reactive mixture comprising: i) one or more high molecular weight, hydroxyl group containing compounds, ii) one or more organic compounds containing amine groups, and iii) of one or more low molecular weight diols or triols; and C) an inorganic filler mixture consisting of: 1) of glass flakes, and 2) of another inorganic filler. Components A) and B) are present in quantities such that the isocyanate index is from 90 to 120. Component C) is dispersed phase-stable in either or both component A) and/or component B) prior to mixing components A) and B).

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: This invention relates to a one-step process for preparing polyurea elastomers comprising reaction at an isocyanate index of from 90 to 200 of(a) one or more aliphatic and/or cycloaliphatic diisocyanates;(b) 25 to 70 equivalent percent, relative to the total of components (b) and (c), of one or more liquid amine-terminated polymers containing at least two aromatically bound isocyanate-reactive primary or secondary amino groups and/or aliphatically bound isocyanate-reactive secondary amino groups and having a molecular weight of from 400 to 6000; and(c) 75 to 30 equivalent percent, relative to the total of components (b) and (c), of one or more aromatic diamine chain extenders having a molecular weight of from 108 to 399, optionally in admixture with one or more crosslinkers.

Abstract: This invention relates to a process for the production of a polyurethane cushion backing on a substrate. In particular, the polyurethane to be used in the process is produced by the reaction of an isocyanate and a polyol mixture, wherein the isocyanate is based on polymethylene poly(phenylisocyanate) and having a monomer content of less than 55%, a 2,2'- and 2,4'-methylene bis(phenylisocyanate) content of less than 3%, a functionality of less than 2.5, an isocyanate group content of 25 to 30%, and a urethane group content of about 2 to 6%.

Abstract: The present invention relates to a two-component, aqueous polyurethane coating composition which may be cured at ambient temperature and which containsI) a first component based on an aqueously dispersed polyurethane wherein the polyurethane hasa) an average hydroxy functionality of at least 1.8b) a total content of urethane and urea groups, calculated as --NH--C--O--, of 9 to 20% by weight, based on the weight of the polyurethane, andc) sufficient chemically incorporated anionic groups andd) ethylene oxide units incorporated within terminal and/or lateral polyether chainsto maintain the polyurethane stably dispersed in water, andII) a second component based on a water dispersible polyisocyanate wherein the polyisocyanate hasa) an isocyanate content of 2 to 30% by weight, based on the weight of the polyisocyanate,b) an average functionality of at least 1.

Abstract: The present invention is directed to an aqueous polyisocyanate dispersion which has an isocyanate content of at least 0.5% by weight, based on the weight of the polyisocyanate, and is prepared bya) dispersing in water a polyisocyanate which has an isocyanate content of at least 12% by weight and is rendered hydrophilic by reaction with a compound containing a lateral or terminal nonionic hydrophilic group andb) chain extending the dispersed polyisocyanate with a primary or secondary monoamine containing at least one hydroxyl group in an amount sufficient to provide an equivalent ratio of amino groups to isocyanate groups of 0.6:1.0 to 0.95:1.0.

Abstract: The present invention is directed to a process for the preparation of an aqueous two-component polyurethane-forming composition bya) dispersing in water a polyisocyanate which has an isocyanate content of at least 12% by weight andb) also blending with water either before, during or after dispersing the polyisocyanate, a polyhydroxyl compound whichi) has a molecular weight of 62 to 10,000,ii) contains at least two hydroxyl groups,iii) is water soluble or water dispersible,iv) does not contain urea or urethane groups andv) is selected from the group of polyesters, polylactones, polycarbonates, polyethers, polythioethers, polyacetals, polyether esters, polyester amides and polyamides,wherein the equivalent ratio of isocyanate groups to aqueous groups is 0.8:1 to 6:1.The present invention is also directed to the aqueous composition prepared by this process and to its use as a binder for fiberglass.

Abstract: This invention relates to radiopaque polyurethane compositions that are reaction products of(a) cycloaliphatic diisocyanates;(b) at least one polyester, polycarbonate, and/or polyester carbonate diol having a molecular weight of from about 1000 to about 6000;(c) an isocyanate-reactive bromine-containing aromatic chain extender; and(d) optionally, a catalyst;wherein the quantity of component (c) is such that the amount of bromine in the polyurethane composition is from 10 to 35% by weight, and wherein the components are reacted at an isocyanate index of from 0.95 to 1.2.

Abstract: The invention is directed to a process for protecting the edges of a panel by applying a non-sagging polyurethane composition to the edges of said panel, and allowing the composition to cure.

Abstract: The present invention is directed to a hydrophilic composition which is the reaction product of a polyvinylpyrrolidone, an organic monoisocyanate, and an oxyalkylene group containing mono- or di- hydroxyl compound.

Abstract: The present invention is directed to a hydrophilic composition which is the reaction product of a polyvinylpyrrolidone, an organic monoisocyanate, and an oxyalkylene group containing mono- or di- hydroxyl compound.