Abstract: A non-yellowing, impact resistant high hard segment polyurethane made from a non-aromatic diisocyanate, a diol chain extender and an aminodiol chain extender may also contain up to five percent by weight of a macroglycol. A catalyst free method to prepare the polyurethane is a feature of the invention.

Abstract: A catheter of a thermoplastic elastomeric hydrophilic polyurethane is coated on at least the outside surface with a hydrophobic polymer and expands to a larger lumen size in about 3 to 15 minutes when contacted with an aqueous liquid. The hydrophilic polyurethane may be synthesized by one-shot bulk polymerization, and may be melt extruded into a base tubing and dip coated with the hydrophobic polymer, or the hydrophilic polyurethane and hydrophobic polymer may be coextruded. The catheter may have multiple lumens and may include an antithrombogenic agent, antiinfective agent and radiopaque agent.

Abstract: A soft, low modulus, non-crystalline segmented polyurethane characterized by a 100% modulus less than about 250 psi, initial tensile set less than about 30% and tensile strength of about 3500 to 6500 psi obtained by balancing the percent hard segment and the degree of cross-linking within the ranges 14 to 25% hard segment and 5,000 to 30,000 molecular weight per cross-link in a segmented polyurethane; and a flexible glove for use by surgeons and others which is easily donned and comfortable on the hand, wherein the glove forming material consists essentially of the aforesaid polyurethane.

Abstract: A powder coating process for producing soft, flexible polyurethane films particularly in the form of a surgical glove, wherein low melting crystalline prepolymer particles are powder coated and cured to an essentially non-crystalline film.

Abstract: A crystalline grindable end-blocked prepolymer useful in providing a polyurethane elastomer having a 100% modulus less than approximately 250 psi, tensile of 3500 to 6500 psi, and less than 30% initial tensile set, said prepolymer being the product of reacting an organic polyisocyanate, a long chain crystalline diol having an average molecular weight of approximately 500 to 5000, a polyhydroxy cross-linking agent, and an end-blocking agent.