Abstract: The present invention relates to polyurethane encapsulated fertilizer particles which exhibit slow-release properties and to a process for their production. The process comprises applying an isocyanate-reactive component to fertilizer particles, to form fertilizer particles coated with an isocyanate-reactive component, applying a polyisocyanate component onto the coated fertilizer particles to form polyurethane encapsulated fertilizer particles, and, optionally, repeating these steps as many times as necessary to form the polyurethane encapsulated fertilizer particles that contain about 2 to 20% by weight of polyurethane, based on the total weight of the encapsulated fertilizer particles. Suitable isocyanate-reactive components include polyesterether polyols that comprise either a blend of or the reaction product of (i) castor oil having an OH number of about 160 to about 170, a viscosity of about 500 to about 900 mPa.s at 25° C., and a water content of less than 0.

Abstract: This invention relates to polyurethane encapsulated fertilizer particles which exhibit slow-release properties and to a process for their production. The process comprises (1) applying an isocyanate-reactive component or a polyisocyanate component to fertilizer particles, to form coated fertilizer particles, followed by (2) applying a polyisocyanate component or an isocyanate-reactive component onto the coated fertilizer particles to form polyurethane encapsulated fertilizer particles, and, optionally, repeating these steps as many times as necessary to form the polyurethane encapsulated fertilizer particles that contain about 2 to 20% by weight of polyurethane, based on the total weight of the encapsulated fertilizer particles. Alternatively, the isocyanate-reactive component and the polyisocyanate component can be premixed prior to being applied to the fertilizer particles to form polyurethane encapsulated fertilizer particles. Suitable isocyanate-reactive components comprise oleo polyols.

Abstract: The present invention relates to a process for producing lignocellulose composite materials by combining lignocellulose particles with a binder composition, followed by molding or compressing the combined lignocellulose particles and binder composition. Suitable binder compositions comprise a polymethylene poly(phenylisocyanate) component and a liquid hydrophobic diluent that is characterized by a flash point of at least 250° F.

Abstract: The present invention relates to a process for the production of one-shot polyurethane elastomers having low compression sets. This process comprises reacting a polymethylene poly(phenylisocyanate) having an average functionality of 2.2 to 2.8, and a polyol component that has an average functionality of 2.0 or less. The polyol component comprises at least one relatively high molecular weight isocyanate-reactive component, and at least one relatively low molecular weight isocyanate-reactive component, with the functionalities and quantities of each component being such that the above average functionality of 2.0 or less for the polyol component is satisfied. Polyurethane elastomers produced by the process of this invention are characterized by compression sets of less than 10%.

Abstract: This invention relates to a process for the production of polyurethane elastomers having low compression sets. The process comprises reacting A) an isocyanate component comprising methylene bis(phenyl isocyanate) containing the 2,4′-isomer of methylene bis(phenyl isocyanate), with B) an isocyanate-reactive component, optionally, in the presence of C) one or more additives. The reaction components are processed via the one-shot process at an isocyanate index of 90 to 130.

Abstract: This invention relates to solid elastomeric polyurethanes prepared by reacting, in an open mold at an isocyanate index of 80 to 120,(a) an isocyanate prepolymer having an isocyanate content of 3 to 15% by weight and a number average molecular weight of 550 to 20,000 prepared by the reaction of(1) organic polyisocyanates having 2 to 3 NCO groups, and(2) isocyanate-reactive polyester polyols having two to three isocyanate-reactive hydroxyl groups and a number average molecular weight of 400 to 10,000 and prepared in the presence of an esterification catalyst, and optionally containing other isocyanate-reactive compounds,wherein the equivalent ratio of isocyanate groups to isocyanate-reactive groups is 1.2:1 to 34:1;(b) a diol chain extender, optionally in admixture with a crosslinker and/or an amino-containing chain extender and/or crosslinker;(c) 0.001 to 10% by weight, based on the weight of the isocyanate prepolymer, of a catalyst; and(d) 0.

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 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: 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 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.

Abstract: The present invention is directed to a process for the preparation of an aqueous polyurea dispersion bya) dispersing in water at an NCO:NH equivalent ratio of 0.5:1.0 to 2.0:1.0i) a polyisocyanate which has an average functionality of 1.5 to 4.0 and an isocyanate content of at least 12% by weight andii) a polyamine having at least two primary and/or secondary amino groups and a molecular weight of at least at an NCO:OH equivalent ratio of 0.5:1.0 to 2.0:1.01000 andb) allowing the polyisocyanate and polyamine to react to form an aqueous polyurea dispersion.The present invention is also directed to the aqueous polyurea dispersion prepared by this process.

Abstract: The present invention is directed to an aqueous dispersion of an encapsulated polyisocyanate which contains ureacted isocyanate groups and is prepared bya) dispersing in water a polyisocyanate which has an isocyanate content of at least 12% by weight andb) reacting the dispersed polyisocyanate with a polyamine having primary and/or secondary amino groups and a molecular weight of 400 or less in an amount sufficient to provide an equivalent ratio of amino groups to isocyanate groups of at least 0.05:1.0.The present invention is also directed to aqueous compositions containing the previously described encapsulated polyisocyanate and an isocyanate-reactive compound.

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 andb) reacting the dispersed polyisocyanate withi) 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 0.1:1.0 to 0.7:1.0 andii) a polyamine having primary and/or secondary amino groups and a molecular weight of 400 or less in an amount sufficient to provide an equivalent ratio of amino groups to isocyanate groups of 0.1:1.0 to 0.4:1.0,wherein component i) is mixed with the dispersed polyisocyanate either before or during the mixing of component ii) and provided that the equivalent ratio of amino groups from both components i) and ii) does not exceed 0.95:1.0.

Abstract: This invention relates to radiopaque polyurethane compositions which are reaction products of(a) cycloaliphatic diisocyanates;(b) at least one polyether diol having a molecular weight of from about 500 to about 6000; and(c) an isocyanate-reactive bromine-containing compound selected from the group consisting of(i) tetrabromodipentaerythritol and(ii) a mixture of tetrabromodipentaerythritol and dibromoneopentyl glycol; and(d) optionally, a catalyst;wherein the amount of component (c) is such that bromine constitutes at least 15% by weight of the polyurethane composition, wherein the weight ratio of component (b) to component (c) is from about 2:98 to about 55:45, and wherein the components are reacted at an isocyanate index of from about 95 to about 120.

Abstract: The present invention is directed to a solid polyurethane composition having a glass transition temperature of from -20.degree. C. to 0.degree. C., having a Bayshore rebound of less than 20, and having a Shore A hardness of less than 80.

Abstract: The present invention is directed to a solid polyurethane composition having a glass transition temperature of from -20.degree. C. to 0.degree. C., having a Bayshore rebound of less than 20, and having a Shore A hardness of less than 80.

Abstract: The present invention is directed to a solid polyurethane composition having a glass transition temperature of from -20.degree. C. to 0.degree. C., having a Bayshore rebound of less than 20, and having a Shore A hardness of less than 80, and being prepared by reacting:a) a polyisocyanate having an isocyanate group functionality of 3 or more, and an isocyanate group content of from 15 to 25% by weight, withb) one or more diols having molecular weights of from 150 to about 650,wherein the isocyanate to hydroxyl equivalent ratio is from 0.95:1 to 1.2:1, and the weight ratio of component a) to component b) is from 5:1 to 1:1.5.

Abstract: The present invention is directed to a solid polyurethane composition having a glass transition temperature of from -20.degree. C. to 0.degree. C., having a Bayshore rebound of less than 20, and having a Shore A hardness of less than 80.