Abstract: Synthetic biomaterials are provided with irreversibly bound amino diphosphonate, polyphosphonate, or other anticalcification agent to prevent in vivo calcification. Such biomaterials include biocompatible elastomers such as polyurethane and/or polydimethylsiloxane, and the like which are intended for invasive, or in-dwelling use in a human or animal body. Illustratively, reaction conditions utilizing hi-or polyfunctional epoxides result in epoxide bridge incorporation of the anticalcification agent to the biomaterial elastomer.

Abstract: There is disclosed a sound-absorbing syntactic foam comprising expanded polystyrene microspheres, dispersed randomly in a polyurethane matrix.

Abstract: This invention relates to a process of preparing polyurethane polymers by reaction of an isocyanate composition having an isocyanate equivalent weight of from 180 to 300 and comprising in from at least 50 weight percent a prepolymer, with an active hydrogen-containing substance in the presence of water which provides for at least 50 mole percent of the total blowing requirement. The prepolymer is obtained by reacting a molar excess of a polyisocyanate comprising, in from at least 70 weight percent, 4,4'-methylene diphenylisocyanate with an isocyanate-reactive composition containing (a) a branched diol or triol having a molecular weight of from 60 to 300, and (b) a polyoxyalkylene polyol or mixtures thereof having an average functionality of from 2 to 4 and a molecular weight of from 3000 to 12000, wherein the parts by weight ratio of (a):(b) is from 0.01:1 to 0.25:1.

Abstract: An insoluble material for adsorbing a pyrogen comprising a polymer of an aziridine compound. According to the present invention, a large mount of the pyrogen can be easily removed from a solution containing pyrogen, and a large amount of the material for adsporbing the pyrogen can be prepared in easy steps. Therefore, the adsorbing material can greatly contribute to the preparation of medicines.

Abstract: The present invention relates to foam compositions which are expanded with hydrohalocarbon blowing agents in the presence of catalysts which are capable of decreasing the amount of decomposition of the hydrohalocarbon blowing agents to haloalkenes during the polymerization. Thus, the present invention provides compositions comprising polyisocyanate, polyol, hydrohalocarbon blowing agent, surfactant, and catalyst for polymerization of the polyisocyanate and polyol wherein the catalyst is capable of decreasing the amount of decomposition of the hydrohalocarbon blowing agents to haloalkenes during polymerization of the polyisocyanate and the polyol.

Abstract: Process for the preparation of rigid polyurethane foam by reaction of a polyfunctional isocyanate-reactive composition with a polyisocyanate composition comprising the reaction product of a stoichiometric excess of an organic polyisocyanate and a substantially fluorinated isocyanate-reactive compound, optionally in the presence of an inert, insoluble fluorinated compound.

Abstract: A polyurethane or polyurethane-urea elastomeric composition, characterized in that the composition is a reaction product of:(A) a soft segment macrodiol which is either:(i) a homopolymer represented by formula I,HO--[(CH.sub.2).sub.n O].sub.m --H Iwherein n represents an integer greater than 5 and less than 13, m is a number such that the number average molecular weight of the compound of formula I falls in the range from 218 to 5000 and optionally at least one hydrogen atom represented in formula I is substituted by a C.sub.1 to C.sub.3 alkyl group or a halogen atom;(ii) a copolymer containing at least 25% by mass of repeating units --(CH.sub.2).sub.n O-- wherein n is as defined in formula I above; or(iii) mixture of macrodiols comprising greater than 10% of a macrodiol as defined in formula I above;(B ) an aliphatic or aromatic diisocyanate known in the art of polyurethane manufacture; and(C) optionally a chain extender.

Abstract: Radiation-cured pressure-sensitive adhesives are provided comprising a radiation cured polyurethane backbone capped with both an acrylic or methacrylic reactive terminating group and residues of a mono-ol or polyol non-reactive terminating group. The adhesives include a functional amount of a thio compound which provides for improved control in pressure-sensitive adhesive properties when the adhesive precursor is irradiated.

Abstract: A rheology-influencing agent for coating media, containing a mixture of a (meth)acrylic copolymer containing hydroxyl groups and/or one or more polyesters containing hydroxyl groups, a hydroxy functional microdispersion obtainable by preparing a solution of one or more film-forming polyesters containing hydroxyl and/or carboxyl groups and/or (meth)acrylic copolymers containing hydroxyl and/or carboxyl groups, the foregoing mixture being reacted with a diisocyanate, and an aliphatic primary monoamine.

Abstract: This invention relates to a process for coating a substrate which comprises contacting the substrate with a low volatility organic (so-called "low VOC") coating composition having a viscosity as measured by ZAHN cup 2 of less than about 200 seconds and consisting essentially of at least one polyisocyanate prepolymer which is the reaction product of a polyisocyanate with an active hydrogen-containing compound selected from the group consisting of monoahls, polyols, imines, oxazolidines, and combinations thereof, a solvent in an amount of between 0% and 45% by weight based upon the amount of said polyisocyanate in said composition, and a tertiary amine catalyst, said composition being essentially free of any volatile mono- and di-isocyanates, and said composition being moisture curable upon exposure to atmospheric moisture. Also claimed is the coating composition itself.

Abstract: A thermoplastic polyurethane elastomer containing a very small amount of small grains, and having a high molecular weight and a narrow molecular-weight distribution. Such high-quality thermoplastic polyurethane is excellent in melt moldability and allows to prevent yarn breakage in producing fibers by melt spinning, for example. Such polyurethane elastomer can be produced by melt-polymerizing a prepolymer and a low-molecular diol at a relatively high temperature in a short period of time. This invention also provides an apparatus for producing the polyurethane elastomer, and fibers formed of said elastomer.

Abstract: Unsaturated polyurethanes, and the use thereof as reactive emulsifiersUnsaturated polyurethanes which contain from 20 to 80% by weight of polyethylene glycol units and can be prepared by reactinga) at least one organic polyisocyanate,b) an unsaturated fatty alcohol, a polyalkylene glycol ether thereof or an unsaturated acid ester containing one hydroxyl group,c) one or more diols which additionally contain at least one further hydroxyl group or carboxyl group andd) a polyethylene glycol having a molecular weight in the region of 750 to 10,000, with maintenance of an NCO/OH equivalent ratio, based on all the starting components a) to d), of from 0.7:1 to 1.2:1.These unsaturated polyurethanes are used as reactive emulsifiers for the preparation of dispersions of hydrophobic synthetic resins which can be cured by means of free radicals and/or oxidatively.

Abstract: Aromatic polyisocyanates, e.g., toluene diisocyanate, are prepared by reacting/contacting at least one aromatic compound (A) bearing at least two primary amine substituents, e.g., toluenediamine, xylylenediamine and/or phenylenediamine,, with phosgene, in gaseous phase and in a reactor/reaction zone devoid of active mechanical stirring.

Abstract: A co-polymer composition for coating porous structural material includes a compatible surfactant resulting in a structural inter-bonding between the coating composition and the structural material. The co-polymer composition cured in a layer of unsupported foam has sufficient strength to be used as a substitute for comparably or larger sized layers of re-enforced concrete for conducting fluids while resisting compressive loads. A co-polymer foam composition for coating structural material cures to have an atmosphere-facing surface that is substantially impervious to corrosive substance penetration.

Abstract: A method for producing an in-mold coated plastic article having an adherent coating wherein the coating composition has improved surface coverage properties and a fast cure rate. The coating composition contains (a) a first component comprising at least one polyol having at least 4 hydroxyl groups and a viscosity at room temperature of 6000 cps or less; and (b) a second component comprising a solvent-free isocyanate prepolymer. The viscosity of the coating composition is 15000 cps or less at room temperature.

Abstract: A process for inhibiting chemical reactions of a fluid functionally reactive organic material by mixing it with supercritical fluid ("SCF") or near supercritical fluid, especially carbon dioxide maintained under supercritical fluid conditions. The process includes the ability to restrain a chemical reaction that occurs otherwise between functionally compatible organic molecules by the inclusion of supercritical fluid, particularly CO.sub.2, with the molecules, so that the reaction can be made to occur according to a predetermined but different from normal pattern.

Abstract: A resin for electrophotographic toner comprising a degradable polyester resin which is an amorphous poly (.alpha.-hydroxycarboxylic acid) prepared by direct dehydration-polycondensation of an .alpha.-hydroxycarboxylic acid and having, preferably, a number-average molecular weight ranging from 2000 to 7000. A further resin for electrophotographic toner comprising a degradable polyester resin which may be prepared by reacting an amorphous or semicrystalline poly (.alpha.-hydroxycarboxylic acid), having a number-average molecular weight ranging from 1000 to 7000 or 2000 to 7000 and prepared by direct dehydration-polycondensation of an .alpha.-hydroxycarboxylic acid, with a polyol having at least three hydroxyl groups or a polycarboxylic acid having at least three carboxyl groups in the molecule and, in case of the reaction product with the polyol can further be reacted with a diisocyanate to give an urethane-modified polyester. These polyesters can likewise be used as resins for toner.

Abstract: The invention relates to vinyl sulfonated and non-sulfonated hydroxy functional polyurethane copolymers prepared from macromonomer diols and their use in magnetic recording media. The sulfonated hydroxy functional copolymer comprises: a polyurethane backbone; at least one SO.sub.3 M group pendant from the polyurethane backbone, wherein the polyurethane backbone has an S0.sub.3 M equivalent weight of from about 2,000 to about 100,000, and wherein M is selected from the group consisting of H.sup.+, NR.sub.4.sup.+ wherein R can be H.sup.+ or an alkyl group, Li.sup.+, Na.sup.+, K.sup.+, and mixtures thereof; at least two crosslinkable hydroxy groups pendant from the polyurethane backbone, wherein the polyurethane backbone has a hydroxy equivalent weight of from about 500 to about 50,000; and at least one vinyl polymeric segment B pendant from the polyurethane backbone.

Abstract: A polymerizable composition is provided which is constituted by adding isocyanate by 0.1 to 2 equivalent to the alcoholic hydroxyl group in a mixture dissolving component A prescribed below by 20 to 60 parts by weight to a total of 80 to 40 parts by weight of component B and component C in the ratio specified below:[Component A]A multifunctional (meth)acrylate possessing at least one alcoholic hydroxyl group, and also possessing at least one aromatic ring replaced by at least one halogen atom other than fluorine or phenyl group, and two or more (meth)acryloyl groups in a molecule:[Component B]A multifunctional (meth)acrylate possessing at least one aromatic ring having neither halogen atom nor phenyl group as substituent, and possessing two or more (meth)acryloyl groups in a molecule, or a mixture of radically polymerizable multifunctional unsaturated monomer including the compound; 5 to 80 wt.

Abstract: The variations in the delivery rate of additive caused by fluctuations in a system for the preparation of a polyurethane reaction mixture from flowable reactants and an additive, in particular a blowing agent, are kept within negligible limits by subdividing the supply pipe (4) to the mixing head (6) into a main pipe (8) and a subpipe (9) and introducing the additive into the side stream, which is substantially smaller than the main stream.