Abstract: A method of forming a urethane prepolymer comprising the steps of gradually adding an isocyanate compound to a hydrophilic polyether or polyester compound without substantial added mixing whereby a relatively dense isocyanate layer and a polyether or polyester layer overlying the isocyanate layer are formed, and a urethane prepolymer-forming reaction occurs at the interface between the layers. The resulting urethane prepolymer may be reacted with water to form a cellular urethane polymer, or with an aqueous slurry of unconsolidated aggregate material to form a consolidated aggregate product, such as a plant growth supporting rooting medium.

Abstract: Polyurethane moldings having an inhomogeneously colored surface with color contrasts in fiber-like distribution are made by incorporating colored fibers of a specified type in a polyurethane forming reactionmixture. The colored fibers must have a staple length of from 0.1 to 6 mm, a denier of from 0.1 to 25 dtex, and a coloring agent that does not migrate or dissolve in the polyurethane-forming materials. These fibers are generally used in a quantity such that they represent from 0.1 to 10 wt. % of the polyurethane-forming reaction mixture. Shoe soles, shoe heels, multiple layer soles and padded components are examples of moldings which may be produced in accordance with the present invention.

Abstract: Aminoplast resin is prepared by reacting urea or melamine with formaldehyde in the presence of a stabilizer compound. Dispersions of the resin in a polyol reacted with a polyisocyanate produce polyurethane products having low flammability properties.

Abstract: A method of forming a hydrophilic urethane prepolymer useful in consolidating aggregate material comprises the steps of adding an isocyanate compound to a hydrophilic polyether or polyester compound which has been heated to such a temperature that the temperature of the reactants after addition of isocyanate is at least as high as about 120.degree. C. The resulting urethane prepolymer may be reacted with an aqueous slurry of unconsolidated aggregate material, such as peat, to form a consolidated aggregate product, such as a plant growth-supporting rooting medium.

Abstract: A polyurethane is comprised of the reaction product of a polyisocyanate and a polyreactive hydrogen compound having a polypeptide admixed therewith.

Abstract: This invention relates to a process for the production of optionally foamed polyurethane plastics, particularly shaped articles, using certain denatured biomasses as reactive fillers. The fillers in question comprise biomasses based on microorganisms and the derivatives and decomposition products of microorganisms, particularly biologically purified sludges, which have been deodorized and irreversibly denatured by reaction with isocyanates and/or carbonyl compounds and compounds capable of aminoplast and/or phenoplast formation.

Abstract: A flexible polyurethane foam is provided which is fire retardant and non-dripping upon exposure to flame. The flexible polyurethane foam is prepared by the reaction of a polyol, an isocyanate and a protein.

Abstract: An absorbant for use in artificial organs which is obtained by mixing and dissolving pitch with an aromatic compound and a polymer or copolymer of a chain hydrocarbon, dispersing the resultant mixture in water giving rise to beads and subjecting these beads to a series of treatments of removing of the aromatic hydrocarbon, infusibilizing, carbonizing and activating.

Abstract: A composition suitable for use as a binder for shredded, flexible polyurethane foams to make articles such as carpet or rug underlay comprises a polyalkylene ether polyol having from 2-4 hydroxyl groups, a minor amount by weight of a rubber extender oil, a stoichiometric excess of a certain diisocyanate and a minor amount by weight of a finely divided, solid soybean derivative.

Abstract: Polyurethane foams are prepared by reacting an active hydrogen-containing organic compound with an organic polyisocyanate in the presence of a blowing agent and an amylaceous material which has been stabilized (a) by treating with a stabilizing agent containing an effective amount of an antioxidant capable of inhibiting the formation of oxidation products in the amylaceous material upon exposure to an oxidizing atmosphere or (b) by removing substantially all, or at least a major portion, of the oxidizable materials, particularly fatty acids or fats, from the amylaceous material.

Abstract: A non-swellable three-dimensional polymer having a component which is a residue of an optically active compound, which residue is chemically removable from said polymer to leave behind in the physical structure of said polymer a void corresponding to the size and shape of said residue of optically active compound, and a particular steric arrangement of functional groups within the void of said polymer corresponding to the chemical structure of said residue of optically active compound, the original polymer having recurring units of the formulas ##STR1## wherein A, C and D are residues bonded to B of compounds which residues are polymerizable or polycondensable and B is a residue of an optically active compound; a process for preparing such polymer and the form of such polymer containing such void and free of the residue of optically active compounds.

Abstract: The instant invention relates to hydrophobic inorganic-organic lightweight foams produced from aqueous suspensions of finely divided water-insoluble inorganic materials and polyisocyanates. More particularly, the invention relates to a process for the production of highly filled, hydrophobic, lightweight polyurea foams comprising reacting(a) liquid, water insoluble polyisocyanates free from ionic groups, having viscosities of more than 200 cP at 25.degree. C. and having isocyanate functionalities of greater than 2.1, with(b) an aqueous suspension of inorganic filler, said suspension having a solids content of from 30 to 80 percent by weight and having a pH value of above 8, at least 50 percent by weight of the suspended fillers having a particle size of less than 50 microns,(c) in the presence of the foam stabilizer of the polyether/polysiloxane type and in the presence of a tertiary amine catalyst,The weight ratio of components (b) to component (a) being better 1:2 and 6:1.