Abstract: Problems of extensive foaming and/or of sticky deposits on process equipment that often arise when metal soaps from metal articles that have been given a metal soap containing surface to aid in drawing are removed with aqueous alkaline clearners can be avoided by including in the cleaners used anions such as calcium and magnesium that are capable of precipitating the anions of the metal soaps. The cleaners advantageously also contain chelants, a mixture of nonionic and anionic surfactants, and phosphorus containing anions. Anions from the metal soaps are eventually precipitated from the cleaners used as non-sticky sludge that can be easily separated from the cleaners.

Abstract: In the preparation of double metal cyanide complex catalysts, higher catalyst yield and higher catalyst activity may be obtained by recirculating a stream of catalyst dispersion to the reactor head space in the form of a spray, and by directing this or another circulation loop stream through a high shear in-line mixer. The process economics and catalyst purity may be increased by increasing the solids content of the wet centrifuge/filtration cake to higher solids by pressing the wet cake, preferably by diaphragm squeezing. The number of washes may be decreased thereby without affecting catalyst quality.

Abstract: The present invention is a prepolymer or quasi-prepolymer formed from the reaction of a given amount of a diphenyl methane diisocyanate having at least 5 percent of the 2,4'-isomer and polytetramethylene ether glycols having a molecular weight between 162 and 3000. The glycol which may be combined with other polyether or polyester glycols. The resulting NCO-terminated prepolymer or quasi polymer is a liquid which is stable at temperature of 15.degree. C. for at least 24 hours.

Abstract: Thermoplastic molding materials of improved green strength and impact toughness at low temperatures which are useful for producing injection moldings and are based on a TPU copolymer mixture, contain, based on 100 parts by weight,A) from 20 to 90 parts by weight of at least one thermoplastic polyurethane,B) from 1 to 40 parts by weight of at least one elastomeric graft copolymer formed fromB1) a grafting base comprising an elastomeric polymer having a glass transition temperature of below -20.degree. C. based on butadiene or an acrylate of from 1 to 10 carbon atoms in the alcohol moiety with or without a crosslinker andB2) a graft superstratum prepared by single- or multi-stage copolymerization of styrene, .alpha.-methylstyrene, acrylonitrile,methacrylonitrile and methyl methacrylate or of a mixture of at least two of said monomers,C) from 5 to 75 parts by weight of at least one copolymer prepared by copolymerization of, based on the total weight of (C),C1) from 55 to 90% by weight of .alpha.

Abstract: It was found that a combination of thermoplastic microspheres containing a volatile hydrocarbon and water could be used as effective co-blowing/density reducing agents in low density, integral skin polyurethane foams.

Abstract: The present invention relates to low density, water-blown, rigid foams with good physical properties made with blends of toluenediamine (TDA)/glycerine initiated polyols. The foams made using these blends exhibit no initial surface friability. Further, it was found that specific blends of lower hydroxyl number polyols could be used, thereby reducing isocyanate consumption without affecting the physical properties of the foam.

Abstract: The present invention deals with a polymethylene polyphenylisocyanate blend having a viscosity range of from 15 to 37 cps at 25.degree. C. Specifically, the blend is prepared by mixing a polymethylene polyphenylisocyanate with monomeric diphenylmethane diisocyanate. The unique characteristics of this product are that it displays good storage stability under ambient conditions and has a low viscosity. It is useful in the production of polyurethane foams and adhesives.

Abstract: New macromers useful for the preparation of white, stable, high solids, low viscosity vinyl graft polymer polyol dispersions and processes for the manufacture of the macromers are disclosed.

Abstract: The invention relates to thermoplastic polyurethane elastomers obtainable by reaction ofa) unmodified and/or modified organic polyisocyanates, preferably 4,4'-diisocyanatodiphenylmethane, withb) polyoxybutylene glycols and/or polyoxybutylene/polyoxyalkylene glycols with a molecular weight of from 150 to 1800 and a content of crown ethers, preferably those of the formula (--CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.2 O--).sub.m, where m is from 3 to 6, not exceeding 0.06% of the total weight andc) chain extenders with a molecular weight of from 60 to 400, preferably 1,4-butanediol,to a process for the preparation thereof and to the use thereof for producing molded articles and sheets for use in the medical or hygiene sector and in the foodstuffs sector.

Abstract: The incorporation of 2 to 25 .mu.m particles of a limited class of polyimides having appreciable nonaromatic character into heat curable epoxy resin systems significantly increases the toughness of such systems without loss of other desirable properties. These toughened epoxy resin systems are useful in preparing carbon fiber reinforced composites having compression strength after impact (CAI) of greater than 45 Ksi after a 1500 in-lb/in impact.

Abstract: Crop oil concentrates are disclosed which increase the herbicidal efficacy of herbicides from diverse chemical classes. These crop oil concentrates comprise an anionic polyoxyalkylene surfactant or salt thereof, an adjuvant which is exclusively a fatty acid or its ester, and a hydrocarbon component. These crop oil concentrates are especially effective with cyclohexenone and triketone herbicides and growth regulators.

Abstract: Hybrid and commingled yarns containing reinforcing fibers and thermoplastic matrix fibers when sized with a dispersion or emulsion having a dispersed phase containing a thermoplastic compatible with the thermoplastic of the matrix fibers but having a lower melting point allow preparation of thermoplastic matrix fiber reinforced composite structures at reduced consolidation temperatures, cycle times, and/or consolidation pressures without loss of composite physical properties.

Abstract: Composite assemblies prepared from thermosettable matrix resin-impregnated fiber-reinforced prepregs, conductive metal screens, and film adhesives are provided which do not develop microcracks after extensive thermal cycling. The composite assemblies are particularly useful in the manufacture of vehicles in the transportation industry, especially aircraft.

Abstract: The flame retardancy of flexible polyurethane foams is increased by incorporation into the foam forming reactants of a low molecular weight, high primary hydroxyl trifunctional polyether polyol having a hydroxyl number between 300 and 500 and a primary hydroxyl content greater than 50 percent.

Abstract: A process for the preparation of cellular plastics, preferably hard structural polyurethane foams, by the polyisocyanate polyaddition process involves reactinga) an organic and/or modified organic polyisocyanate withb) at least one high-molecular-weight compound containing at least two reactive hydrogen atoms and, if desired,c) a low-molecular-weight chain extender and/or cross-linking agent,in the presence ofd) a blowing agent from the group comprising tertiary alcohols (di), preferably tertiary butanol, or a mixture of at least one tertiary alcohol (di) and water (dii),e) a catalyst and, if desired,f) assistants and/or additives.

Abstract: Bismaleimide resin systems containing low viscosity epoxy resins and a swellable or soluble thermoplastic when utilized to impregnate intermediate modulus carbon fiber are capable of preparing quasiisotropic composites, which, when cured, exhibit compression strengths after impact of greater than 47-50 ksi after an impact of 1500 in-lb/in.

Abstract: Mixtures of medium viscosity polymeric MDI and HCFC-22 have unexpectedly low vapor pressure, rendering such mixtures suitable for the preparation of polyurethane and polyisocyanate foams.

Abstract: The present invention relates to an improved process for producing, by means of a portable foaming apparatus having a static mixer, a polyurethane foam by reacting a reaction mixture comprised of a polyol, an organic isocyanate, a foaming/frothing agent, and a reaction catalyst, the improvement comprising employing monochlorodifluoromethane as at least a portion of said blowing/frothing agent in said reaction and employing an acid-blocked amine catalyst as at least a portion of said reaction catalyst in order to produce a CFC-free essentially closed-cell rigid or simi-rigid polyurethane foam.

Abstract: The invention relates to transparent, substantially compact polyurethane casting compositions, sterilizable with superheated steam, which are prepared by the reaction of:A) modified diphenylmethane diisocyanates (A) that are liquid at 23.degree. C. and are in turn are obtained by the reaction of1) a diphenylmethane diisocyanate isomer mixture, which in terms of 100 parts by weight comprises 60 to 90 parts by weight of 4,4'-diphenylmethane diisocyanate, 40 to 8 parts by weight of 2,4'-diphenylmethane diisocyanate, and 0 to 5 parts by weight of 2,2'-diphenylmethane diisocyanate with2) at least one polyoxypropylene polyol initiated with glycerine and/or trimethylol propane, having a molecular weight of 350 to 800 with a ratio of NCO:OH groups of 2.5:1 to 15:1, withB) at least one compound having at least two reactive hydrogen atoms in the presence or absence ofC) catalysts,as well as to a process for preparing the polyurethane casting compounds and their use for medical-technical articles.

Abstract: Mixtures of medium viscosity polymeric MDI and HCFC-22 have unexpectedly low vapor pressure, rendering such mixtures suitable for the preparation of polyurethane and polyisocyanate foams.