Abstract: The subject invention is directed to a thermoplastic polymer blend of polyurethane and nitrile rubber having a Shore A hardness of about 55 to 70. The thermoplastic polyurethane component includes at least about 50 weight percent (wt. %) polyisocyanate; the nitrile rubber component includes about 34 mole percent (mol %) acrylonitrile; and, the ratio between the thermoplastic polyurethane component and the nitrile rubber component is about 30:70 to 40:60 volume percentage (vol %).The invention also provides a process for making a thermoplastic polyurethane blend having a Shore A hardness of about 55 to 70; prepared by mixing and kneading about about 180.degree. to 215.degree. C., polyurethane component including at least about 50 percent by weight polyisocyanate with a nitrile rubber having a viscosity of M.sub.L 1+4,100.degree. C.=50 and including about 34 mole percent (mol %) acrylonitrile in a ratio of polyurethane: nitrile rubber of about 30:70 to 40:60 percent by volume (% vol).

Abstract: A pasty molding compound, which is reactive only above room temperature and is intended for manufacturing temperature-resistant, elasticized duromer molded components, consists of a dimerized trimethylol propane (melting point 109.degree. C., molecular weight 250, OH number 900) and of 1 to 625 parts by weight (per 100 parts of methylene diphenyldiisocyanate) of low-molecular weight and an isocyanate-limited polyesterpolyol-diisocyanate-prepolymer, prepared from polycaprolactone and an isomeric mixture of the toluenediisocyanate. This masterbatch, which has an NCO excess of up to 15% over the equivalent quantity of the free OH components can be fortified with fillers and is moldable at low pressures. Furthermore, its application as an impregnating agent for glass-fiber mats to be molded is provided.

Abstract: This invention is directed to a latently reactive pasty molding material (masterbatch), which only becomes reactive above ambient temperature (about 25.degree. C.), for producing temperature-resistant, elasticized, molded, duromer components which is comprised of a mixture of a methylene-diphenyl diisocyanate and a diamine which is not reactive at ambient temperature, but is reactive above about 120.degree. C., which is selected from the group consisting of an alkali-halide salt complex, which is the reaction product of three moles at 4,4'-diphenylmethane diamine and of one mole halide salt, and alternatively a hexamethylene-6,6'-diamine carbamate; and about 1 to 625 parts by weight (per 100 parts methylene-diphenyl diisocyanate) of a low-molecular weight isocyanate-terminated polyesterpolyol-diisocyanate prepolymer, produced from polycaprolactone and a mixture of the toluylene diisocyanate isomers. The mixture has a NCO excess of up to 15% more than the sum of the free OH-- and NH.sup.2 -- constituents.

Abstract: A tube or ring-shaped, elastic cuff is used as a antimicrobial fitting for medical catheters. The fitting is manufactured from organic silicon/polyurethane elastomer including an antimicrobial agent. The fitting is annularly disposed on a catheter and held in place by radial tension. The fitting has very high tensile strength and resistance to tearing and preferably has a wall thickness of about 0.1 mm; may be cut into segments of 2 to 10 cm long; and can be drawn onto a catheter as individual segments.

Abstract: A medical device which can be introduced into the body tissue of a human or animal comprises a matrix of a polyurethane elastomer with organic silicone polymer units built into the main polymer chain and an oligodynamic agent spatially distributed uniformly within the matrix. The oligodynamic agent releases bacteriocidal or microbicidal metal ions when exposed to body tissues. The method for manufacturing the medical device is characterized by the addition of the oligodynamic agent in a solid or dissolved form prior to the reaction of the educts with isocyanate.

Abstract: The invention disclosed herein relates to a method for the preparation of finely dispersed polyurethane ureas. The method comprises the steps of first preparing a chain extended polyurethane from at least one diisocyanate, at least one polydiol, and diol chain extenders. The chain-extender component of the reaction is comprised of low molecular weight diols having side chains or ether groups, unbranched low molecular weight diols and/or monofunctional compounds having an active hydrogen such as the amines, amides or alcohols. The chain extended polyurethane is then treated with a nonionic emulsifier and emulsified first with warm water, and then with cold water. A diamine or a mixture of diamines is then added to the emulsion.

Abstract: The invention described herein relates to a method for heat sealing the opposing surfaces of planar textile materials which comprises applying a heat-seal adhesive to at least one of the opposing surfaces of the textiles, and then pressing the opposing surfaces of the textiles together under heat and pressure to heat-seal the textile surfaces together. The heat-seal adhesive employed is a low-melting polyurethane prepared by reacting at least one diisocyanate with at least one polyol having a molecular weight between about 500 and 5000, at least one diol which is branched or includes an ether group, and at least one diol which is unbranched. The diol reactants have an average molecular weight of less than about 500. The total hydroxyl group content of the reactants exceeds or equals the total isocyanate content of the reactants.

Abstract: The invention disclosed herein relates to a method for bonding the opposing surfaces of textile materials to each other with a heat-seal adhesive. The heat-seal adhesive is a polyurethane urea heat-seal adhesive prepared by first preparing a chain-extended polyurethane from at least one diisocyanate, at least one polydiol, and chain-extenders. The chain-extenders may comprise a mixture of low molecular weight diols comprised of at least one low molecular weight diol having a molecular weight below about 500 and having side chains or ether groups, and at least one unbranched low molecular weight diol having a molecular weight below about 500. The chain-extended polyurethane has a free-isocyanate group content which comprises from about 10 to about 40 mole percent of the isocyanate content of the starting mixture. An emulsifier is added to the chain-extended polyurethane, and the polyurethane and emulsifier mixture is emulsified with water. Diamines or diamine mixtures may be added to the emulsion.

Abstract: The invention described herein relates to a method for preparing a low-melting polyurethane which comprises the reaction of at least one diisocyanate, at least one polyol having a molecular weight between 500 and 5000, at least one diol which is branched or includes an ether group, and at least one diol which is unbranched. The diols have a molecular weight of less than about 500. The hydroxyl group content of the reaction mixture exceeds or equals the isocyanate content of the reaction mixture.

Abstract: A hydrophilic foam is produced by mixing an isocyanate terminated branched polyethylene polyol with a polyester prepolymer and water. The foam may be used to impregnate fabrics, e.g., non-wovens, to produce reinforced sheets of foam of high absorbency and markedly improved abrasion resistance. Preferred polyesters are condensation products of adipic acid plus one or more alkanediols or a polylactone. Other prepolymers may also be included in the mix undergoing foaming, along with conventional additives.

Abstract: A novel elastic polyurethane having outstanding properties for use in making mono- and multi-layer food casings, more especially sausage casings, by extrusion. Stretching, especially biaxial stretching, gives further improvement. The casings can be boiled and scalded without folding or wrinkling when cooled. The polyurethane comprises a particular combination of components which imparts the desired properties.

Abstract: Elastic, temporarily adhesive polyurethanes are produced by reaction of a polyol having a molecular weight in excess of about 500, a diisocyanate and a chain lengthener, the diisocyanate being present in about 0.4 to 1.4 times the weight of the polyol and in about 3.5 to 12.5 times the molar amount of the polyol, the chain lengthener having active hydrogen atoms and being present in about 3 to 12 times the molar amount of the polyol, the chain lengthener having a molecular weight of less than about 300, more than about 50 mole % of each of the polyol and diisocyanate units and up to about 50 mole % of the chain lengthener units comprising linear aliphatic C.sub.6 units.