Abstract: Novel platinum/olefin complexes, useful for the hydrosilylation curing catalysis of hardenable organopolysiloxane compositions, are facilely prepared by reacting a platinum halide with at least one alkali or alkaline earth metal carbonate or bicarbonate in the presence of an alkenylcyclohexene ligand having the general formula: ##STR1## wherein R.sub.1 is an alkenyl radical having from 2 to 6 carbon atoms, and R.sub.2 is a hydrogen atom or an inert organic radical, and said complex having a ratio, in gram-atoms of halogen to gram-atoms of platinum, ranging from virtually 0 to 4.

Abstract: A curable composition comprising an organic polymer containing at least one silicon-containing hydrolyzable group in the polymer molecule, an acid phosphoric acid compound and an organozirconium compound. The curable composition can be rapidly cured and has an improved pot life both in open system and in closed system.

Abstract: An improved process for preparing a water-soluble polymer having an excellent water solubility and a high molecular weight, which comprises subjecting a thin layer of an aqueous solution of a water-soluble vinyl monomer to polymerization on a solid support, covering the thin layer with a substantially water-insoluble organic material, e.g. a paraffin, a silicone oil or a low molecular polyethylene, and/or a slightly water-soluble or substantially water-insoluble alkylene oxide adduct at least at a point of time when the aqueous monomer solution has not freely flowed, and further continuing the polymerization.

Abstract: There are disclosed a composition for protective coating material, preferably for a protective coating material of a semiconductor device which is constituted of principal elements of a semiconductor memory element, an encapsulating layer containing an inorganic material for encapsulating said element and a layer of a cured protective coating material arranged between said memory element and said encapsulating layer, which is composed of a polyamide acid obtained by the reaction of a diaminosiloxane, an organic diamine containing no silicon and an organic tetrabasic acid dianhydride, and a semiconductor device having a layer of a cured protective coating material composed of a polyimide-silicone copolymer obtained by dehydrating ring closure of the above-mentioned polyamide acid.

Abstract: Room temperature stable organopolysiloxane compositions containing organosilicon compounds having Si-bonded hydrogen atoms and aliphatic multiple bonds, a platinum catalyst which promotes the addition of Si-bonded hydrogen atoms to the aliphatic multiple bonds and an inhibitior which prevents premature crosslinking at room temperature selected from the group consisting of a maleinimide and a maleic acid derivative of the formula ##STR1## where R.sup.1 is a hydroxyl group or a trimethylsiloxy group and R.sup.2 is a monovalent hydrocarbonoxy radical having from 1 to 20 carbon atoms per radical, which is bonded to the carbon atom of the ##STR2## group or a monovalent hydrocarbonoxy radical having from 1 to 20 carbon atoms per radical, which is bonded to the carbon atom of the ##STR3## group and which is substituted with at least one triorganosilyl group.

Abstract: A self-bonding alkoxy-functional one-component RTV composition which contains as a self-bonding additive a silane which is functionalized by radicals selected from amino, ether, epoxy, isocyanato, cyano, acryloxy, and acyloxy. Such a composition is also shelf-stable and substantially non-corrosive.

Abstract: A method of making a dielectric material comprising blending in a polymer dispersion, a particulate filler material having a high dielectric constant and microfibrous material to form a slurry of polymer, filler, and fiber. A flocculant is added to the slurry to agglomerate the polymer particles, the filler particles, and the microfibers to produce a dough-like material. The dough-like material is formed into a desired shape and then subjected to heat and pressure to densify the dielectric material.

Abstract: Styrenic resins having incorporated therein from 0.5 to 15 pbw of a copolymerizable, ethlenically unsaturated carbonamide such as acrylamide form alloys with polyamides which exhibit improved compatibility, higher heat distortion temperatures and improved Izod impact values over the range of from 5 to 95 wt. % polyamide and 95 to 5 wt. % modified styrenic resin. The alloys may further include unmodified styrenic resins, as well as conventional stabilizers, fillers and the like.

Abstract: Polysiloxane polymers with photoinitiating functionality. The polymers may be obtained by reacting .alpha.-allylbenzoin ethers with a siloxane or polysiloxane containing a plurality of silicon hydride groups. Alternatively, the allylbenzoin ethers may be reacted with a hydrolyzable hydrosilane and further reacted with other hydrolyzable organosilanes or siloxanes to form the polysiloxane with pendant photoinitiating benzoin ether groups. The other hydrolyzable silanes or siloxanes may include photocurable groups to yield self curing polymers. In the same manner, photoinitiating siloxane polymers of the first method may be further polymerized to yield self curing products. The photoinitiating polymers may also be combined with ethylenically unsaturated monomers or other silicones with photocurable groups to yield photocurable compositions.

Abstract: A medical utensil having a portion to contact body fluid or liquid medicine is provided in which at least the contact portion is formed of a copolymer cross-linked by electron beam irradiation and/or .gamma.-ray irradiation.

Abstract: A method for adjusting the cure rate of a mixture of arylene sulfide polymer particles in which the particles of an arylene sulfide polymer mixture are classified by size groups, the size groups of classified particles are segregated, and at least one size group is removed from the mixture. In a further embodiment at least one size group of classified particles removed from one mixture is added to another mixture of polymer particles. In another embodiment the further use of the segregated size groups of classified particles is based upon a determination of the cure rate of at least one segregated size group of particles.

Abstract: A process for producing flame-resistant filaments by preparing a hot solution of a halogen-containing acrylonitrile polymer composition in an inert organic solvent for the composition, extruding the solution to form filaments and removing the solvent from the filaments. Corrosive attack of the solution on metallic equipment used in the process is greatly reduced by incorporating both water and specified phosphorus compounds in the solution.

Abstract: A considerable reduction in modulus, as well as a significant increase in scorch time of a carbon black-containing rubber composition is obtained if the carbon black has been previously oxidized with a very diluted aqueous nitric acid containing only about 0.05 to 1 wt. % of HNO.sub.3 and dried at a temperature of about 400.degree. to 550.degree. F.

Abstract: Compounds having the formula ##STR1## wherein R.sup.1 and R.sup.2 are lower alkyl, R.sup.3 is alkyl, another hindered phenolic norbornane-2,3-dicarboximide group, or a group --(CH.sub.2)--CO.sub.2 R.sup.4 and m is 0 to 3, n is 1 or 2 and R.sup.4 is alkyl, are good oxidative and thermal stabilizers of synthetic polymers.

Abstract: A hot melt composition is used to form a closure liner, e.g. the circular, integral, gasket-like member adhered to the periphery of a circular top or closure for a food jar or the like. The hot melt composition is selected to have, in the solid state, sufficient deformabilty, resiliency, hardness, lubricity, and other requirements of closure liners. It has been found that silicone oil, used in a concentration of about 1-8% by weight of the total hot melt composition can provide a high degree of lubricity, similar to the type of lubricity in self-lubricated plastic bearings. The remainder of the hot melt system or composition generally comprises a rubbery block co-polymer (serving as a film former), a hydrocarbon wax, a hydrocarbon oil, and, if desired, a thermoplastic vinyl arene polymer such as poly(methylstyrene).

Abstract: Fabrics produced from aromatic sulfide polymers are rendered water-repellent by heat treatment near, but below, the melting point of the polymer for a finite period of time. The resulting heat-treated fabric is suitable for flame retardant tents, waterproof clothing, filters, etc.

Abstract: A nitrogen group containing silane of the formula ##STR1## where R is a C.sub.1 -C.sub.4 alkyl group which can contain an oxygen or sulfur atom in the chain, R' is a C.sub.1-4 alkyl radical or hydrogen, A is a bivalent, saturated, branched or unbranched hydrocarbon radical having 2 to 4 carbon atoms in the chain and B is a bivalent, saturated, branched or unbranched hydrocarbon radical having 1 to 10 carbon atoms in the chain; the use of such compounds in an adhesive composition containing an organic polyaddition or polycondensation polymer as an adhesivizing agent.

Abstract: Polyolefin polymers subject to degradation on exposure to ultraviolet light are efficiently stabilized using a combination of a hydroxyphenylalkyleneyl isocyanurate compound and a pentaerythritol phosphite compound. The stabilized compositions exhibit exceptional stability to UV light, better than that achieved using known combinations of phenolic and phosphorous-containing stabilizer compounds.

Abstract: Printing ink binders comprising a reaction product of (a) rosin, (b) .alpha.,.beta.-ethylenically unsaturated carboxylic acid-modified petroleum resin, (c) resol type phenolformaldehyde pre-condensate and (d) polyhydric alcohol, which have an acid value of not more than 30, a softening point of not less than 140.degree. C., a viscosity of a 33% by weight linseed oil solution of not less than Y by Gardner-Holdt bubble viscometer at 25.degree. C. and a tolerance to high-boiling aliphatic hydrocarbon of not less than 5. The reaction products have high softening point and high solubility to solvents, and are useful as binder resins for printing ink. The reaction products in the presence of cyclopentadiene polymer also provide excellent ink binders which have a higher softening point.