Abstract: The present invention is directed to a novel azeotrope consisting essentially of from 25 to 35% by weight of 2-methylbutane and from 65 to 75% by weight of 1,1-dichloro-1-fluoroethane, and the use thereof in the production of rigid, closed cell foams.

Abstract: The present invention is directed to a novel azeotrope consisting essentially of from 25 to 35% by weight of 2-methylbutane and from 65 to 75% by weight of 1,1-dichloro-1-fluorethane, and the use thereof in the production of rigid, closed cell foams.

Abstract: The present invention is directed to a novel prepolymer and the use thereof in a RIM process. The prepolymer is an isocyanate terminated prepolymer having an isocyanate group content of from about 10 to about 26% by weight, and being prepared by a process comprising:(a) reacting a C.sub.1 to C.sub.5 alkyl acetoacetate, with a polyol having a molecular weight of from about 500 to about 6000, and a hydroxyl functionality of from 2 to 4, and(b) reacting the resultant product with an organic di- and/or polyisocyanate.

Abstract: The present disclosure is concerned with procedures for adjusting the average molecular weight, the molecular weight distribution and the viscosity in solution of hyaluronic acid and its salts (HA), particularly its sodium and potassium salts. The average molecular weight can be increased and the molecular weight distribution can be narrowed by precipitating this material into a bath of a non-solvent containing a continuously moving device to which it can adhere as it precipitates. The solution viscosity of this or any high molecular weight, high viscosity HA can be reduced without substantially effecting its molecular weight by either a moderate temperature heat treatment or passage through a fine (one micron or less) pore filter as a one weight percent or stronger aqueous solution. The disclosure is also concerned with the high molecular weight low solution viscosity HA so obtained.

Abstract: In the oxidation of 2-hydroxy-3,3-dimethyl-butanoic acid in solution in the presence of a ruthenium oxide catalyst to produce 2-oxo-3,3-dimethyl-butanoic acid, the improvement wherein oxidation is effected with oxygen.

Abstract: The present invention is directed to coating compositions comprising a) polyisocyanates having a content of isocyanate groups blocked by blocking agents of about 10 to 35% by weight and containing about 0.5 to 10.0% by weight of structural units corresponding to the formula--CO--NH--NH--CO--and b) polyhydroxy polyacrylates in an amount sufficient to provide an equivalent ratio of blocked isocyanate groups to hydroxyl groups of about 0.5:1.0 to 2.0:1.0.The present invention is also directed to the coatings prepared from these coating compositions.Finally, the present invention is directed to blocked polyisocyanates which have a content of isocyanate groups blocked by blocking agents of about 10 to 35% by weight and about 0.5 to 10.0% by weight (calculated as --CO--NH--NH--CO--, MW 86) of structural units corresponding to the formula--CO--NH--NH--CO--Q--whereinQ represents NH--NH--CO-- or the group R--(CO--NH--NH--CO--).sub.nR is an n+1 valent hydrocarbon radical andn has a value from 1 to 3.

Abstract: A molding composition comprising a polycarbonate resin and plating modifier was found to be suitable for preparing metal coated articles where the metal coating is deposited by an electroless process. The plating modifier in accordance with the invention is at least one member selected from the group consisting of a polyanhydride, and a monovinyl aromatic-acrylonitrile copolymer. An advantageous embodiment of the invention includes incorporating in the molding composition a flame retarding amount of a conventional flame retarding agent for polycarbonate compositions.

Abstract: It was surprisingly found that a thermoplastic molding composition which contains polycarbonate and polyalkylene terephthalate resins at a particular weight ratio therebetween is rendered improved impact strength and hydrolysis resistance upon the incorporation of an additive amount of high melt flow high density polyethylene therewith. The molding composition of the invention comprise about 20-90 percent of polycarbonate resin, 80-10 percent of polyalkylene terephthalate (preferably PET) and about 3 to 5 percent of a high density polyethylene resin having a specific gravity of 0.94-0.97 and melt flow of 1 to 80 gm/10 min. as determined in accordance with ASTM D 1238.

Abstract: A thermoplastic molding composition comprising a polycarbonate resin and a benzotriazole ortho carbonate having an improved level of resistance to deterioration caused by exposure to ultraviolet radiation is disclosed. The ultraviolet stabilizer of the invention conforms to ##STR1## wherein R.sub.1 denotes a hydrogen or a halogen atom or a C.sub.1-4 alkyl or alkoxy group,R.sub.2 and R.sub.3 independently represent a hydrogen atom, a C.sub.1-12 alkyl, a C.sub.1-4 alkoxy group, a phenyl or a phenoxy radical, andR.sub.4 denotes a C.sub.1-12 alkylene or a C.sub.6-30 arylene group. The composition is suitable for the preparation of molded articles having an improved level of resistance to ultraviolet radiation.

Abstract: A dust free zone is created in a granulator by including a dust barrier in the pan of the granulator in a position such that the pan is divided into two sections. The inlet for feeding material to be granulated is located in one section of the apparatus and the discharge outlet is located in the other section. This device makes it possible to conduct a granulation process on a continuous basis without interruption and without exposure of workers to potentially hazardous dust.

Abstract: The present invention is directed to a solid polyurethane composition having a glass transition temperature of from -20.degree. C. to 0.degree. C., having a Bayshore rebound of less than 20, and having a Shore A hardness of less than 80.

Abstract: The present invention is directed to a solid polyurethane composition having a glass transition temperature of from -20.degree. C. to 0.degree. C., having a Bayshore rebound of less than 20, and having a Shore A hardness of less than 80.

Abstract: The present invention is directed to a solid polyurethane composition having a glass transition temperature of from -20.degree. C. to 0.degree. C., having a Bayshore rebound of less than 20, and having a Shore A hardness of less than 80, and being prepared by reacting:a) a polyisocyanate having an isocyanate group functionality of 3 or more, and an isocyanate group content of from 15 to 25% by weight, withb) one or more diols having molecular weights of from 150 to about 650,wherein the isocyanate to hydroxyl equivalent ratio is from 0.95:1 to 1.2:1, and the weight ratio of component a) to component b) is from 5:1 to 1:1.5.

Abstract: The present invention is directed to a solid polyurethane composition having a glass transition temperature of from -20.degree. C. to 0.degree. C., having a Bayshore rebound of less than 20, and having a Shore A hardness of less than 80.

Abstract: The present invention is directed to a mold release, a composition containing the mold release, and a process of using the mold release. The mold release comprises an internal mold release composition comprising(a) a zinc carboxylate containing from 8 to 24 carbon atoms per carboxylate group, and(b) a compatibilizer comprising an amidine group-containing compound of the formula ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are straight or branched, saturated or unsaturated hydrocarbon chains having up to 30 carbon atoms which may be substituted by ether groups, ester groups, amide groups or amidine groups and may also be terminated by isocyanate-reactive groups such as hydroxyl or amino groups, R.sub.4 corresponds to the definition of R.sub.1, R.sub.2 and R.sub.3, but may additionally represent an aromatic substituent having 6 to 15 carbon atoms or may represent the group --NR.sub.2 R.sub.3, with the proviso that when R.sub.4 represents the group --NR.sub.2 R.sub.3, R.sub.1 can be hydrogen, and wherein R.sub.

Abstract: The present invention is directed to a coating composition which possesses improved storage stability and containsa) a blocked polyisocyanate prepared by blocking the isocyanate groups of an organic polyisocyanate with a blocking agent based on a di-C.sub.1 -C.sub.12 -alkyl and/or -alkoxyalkyl malonate or an acetoacetic acid C.sub.1 -C.sub.12 -alkyl and/or -alkoxyalkyl esterb) an aromatic polyamine, andc) is free from compounds having monofunctional reactivity towards isocyanate groups.

Abstract: The invention is directed to a device and a method for the application of any adhesive. The device include a hydraulically actuated mixhead which contains means to controllably deliver the components of a polyurethane based adhesive to the point of application of the adhesive and the means to separate between the components until the reaction between them is desired. Typically the components are in the form of streams and comprise an isocyanate stream and a polyol stream, the volume and flow velocity of each of which are in accordance within the invention hydraulically controlled.

Abstract: The present invention is directed to a process for preparing amine terminated compounds by reacting a polyfunctional acetoacetic acid ester with either ammonia or an organic compound which contains one or more primary amino groups in the presence of a solvent and an acidic catalyst selected from the group consisting of (i) boron trifuloride etherate and (ii) organic acids having pKa values of from 0.1 to 0.8 with the proviso that if the primary amino group containing compound contains no aromatically bound amino groups, the pKa of said organic acid is from 0.1 to less than 0.7.

Abstract: A dihalobenzenoid compound is reacted with a dihydric phenol containing an azo group in the presence of a base, an organic solvent and an azeotrope former. Dihydric phenols which do not contain azo groups may also be included in the reaction mixture. This reaction is generally carried out at a temperature of from about 20.degree. to about 250.degree. C. under an inert atmosphere. The polyether obtained is represented by the formula[--O--[E--O].sub.z --E'].sub.x [O--E"--O--E'--].sub.yin which E, E', E", x, y and z have the meaning specified herein.

Abstract: This invention relates to a process for the production of cold-setting flexible polyurethane foam useful for damping sound comprising reacting a polyisocyanate in the presence of water with (a) at least one polyether having an OH number of from 20 to 60 and containing at least two OH groups, wherein said polyether is based on 75 to 95% by weight propylene oxide and 5 to 25% by weight ethylene oxide; (b) a polyether or polyester having an OH number of from 150 to 400 and containing at least two OH groups; and (c) a polyether different from components (a) and (b) having an OH number of from 20 to 200 and containing at least two OH groups, wherein said polyether is based on propylene oxide and ethylene oxide and has an ethylene oxide content above 50% by weight based on the total amount of propylene oxide and ethylene oxide.