Abstract: Fluorinated styrene derivatives of the general formula: ##STR1## wherein n is an integer of 1 to 3 are novel. They form homopolymers and copolymers having water and oil repellency, chemical resistance and flexibility. They are prepared by reacting a halomethylstyrene with an alcohol having a perfluoropolyether group in the presence of a base.

Abstract: A highly heat-resistant and thermally stable polyvinyl chloride resin can be prepared by copolymerizing vinyl chloride monomer and an N-substituted maleimide compound without decreasing the ingerently excellent properties of polyvinyl chloride resins when the monomer mixture is suspension-copolymerized in an aqueous medium containing a suspending agent which is a combination of three different polymers including: (a) a first partially saponified polyvinyl alcohol having an average degree of polymerization in the range from 700 to 3000 and a degree of saponification in the range from 70 to 95%; (b) a second partially saponified polyvinyl alcohol having an average degree of polymerization in the range from 300 to 600 and a degree of saponification in the range from 35 to 55%; and (c) a water-soluble cellulose derivative of which a 0.2% by weight aqueous solution has a surface tension not exceeding 55 dyn/cm at 25.degree. C., in a specified proportion.

Abstract: A specific polyimide resin is provided which is soluble in low-boiling organic solvents. Polyimide resin films having improved adhesion, heat resistance, electrical and mechanical properties are prepared from solutions of the polyimide resin through a brief heat treatment.

Abstract: The process of producing a catalyst for polymerization of organosiloxanes comprises heat-treating a mixture of an aqueous solution of a tetraalkylphosphonium hydroxide, such as tetramethylphosphonium hydroxide, and a cyclic or noncyclic siloxane component, thereby controlling the water content of the system so that the molar ratio of the amount of water in the system to the amount of the quaternary phosphonium hydroxide component in the system will be from 3.0 to 4.0. The process ensures that the crystallization of the tetraalkylphosphonium hydroxide component in the catalyst is obviated effectively.

Abstract: The inventive method provides a silicon carbide membrane for X-ray lithography having high performance in respect of stability against high energy beam irradiation. The method comprises depositing a silicon carbide film by sputtering on a silicon wafer as the substrate under such conditions that the thus deposited film is under a tensile stress in a specified range by keeping the substrate at a temperature higher than 500.degree. C. The thus deposited silicon carbide film is at least partly crystalline and the crystallinity thereof can be defined by the sharpness of a peak in the X-ray diffraction diagram of the membrane which can be assigned to the (1 1 1) plane of the crystalline silicon carbide.

Abstract: Two disc shaped permanent magnets are provided within a yoke structure in a manner to face one another. Two pole pieces are disposed on the surfaces of the two magnets respectively. Small spherical metallic members which induce a localized increase in magnetic field strength, are attached to the surfaces of the opposed pole pieces at selected locations in a manner which unifies the magnetic field produced.

Abstract: An organosilicon compound having the general formula (I): ##STR1## wherein R.sup.1 represents the methyl group or the ethyl group, R.sup.2 represents an alkyl group having from 1 to 4 carbon atoms, and n represents an integer of from 1 to 3. This compound is useful in preparing room temperature vulcanizable organopolisiloxane compositions which have good storage stability, and release no smelly or corrosive condensation by-product on curing.

Abstract: A polysilethylenesiloxane having the following formula: ##STR1## wherein R.sup.1 and R.sup.2 are each a methyl group or a perfluoroalkyl group. The polysilethylenesiloxane has excellent resistance to acid, alkali, etc., and are curable to produce rubber products having excellent mechanical strength.

Abstract: A process for producing an .alpha., .omega.-hydroxyfluoroalkylpolysiloxane comprising polymerizing a cyclotrisiloxane in the presence of a polymerization catalyst of lithium hydroxide or a lithium salt of a diorganosiloxane, and a promoter of phtalic diorganoester and/or ortho-dialkoxybenzene, and stopping the polymerization by adding a neutralizer is disclosed. This process very easily obtains the .alpha., .omega.-hydroxyfluoroalkylpolysiloxane of a desired viscosity.If a chloroethane of the general formula CHX, CCl X.sub.2 (X is the hydrogen or chlorine atom) is used as the neutralizer, the .alpha., .omega.-hydroxyfluoroalkylpolysiloxane does not exhibit any substantial change of viscosity over time.

Abstract: Foaming above the aqueous polymerization mixture can be efficiently reduced in suspension polymerization of vinyl chloride monomer in an aqueous medium contained in a polymerization reactor equipped with a reflux condenser for removal of the heat of polymerization by admixing the polymerization mixture with additives comprising (a) from 0.002 to 0.007 part by weight of a partially saponified polyvinyl alcohol having a degree of saponification in the range from 20 to 50% by moles and an average degree of polymerization in the range from 200 to 400 and (b) from 0.001 to 0.01 part by weight of a silicone-based defoaming agent, each amount being per 100 parts by weight of the vinyl chloride monomer or the monomer mixture mainly composed of vinyl chloride, at a moment, preferably, before the reflux condenser is brought into operation.

Abstract: Disclosed is a method of manufacturing solvent-soluble polyorganosilsesquioxanes of the formula; ##STR1## wherein each R is a substituted or unsubstituted alkyl, alkenyl or halogen-substituted alkyl group of 1-5 carbon atoms, or substituted or unsubstituted phenyl of 6-10 carbon atoms, and n is 2-10,000; which comprises reacting an organotriacetoxysilane with a stoichiometric quantity of alcohol and/or water in an organic solvent to obtain a diacetoxymonoalkoxysilane, which is condensation polymerized in the presence of sodium hydrogencarbonate to obtain a prepolymer, which prepolymer is then condensation polymerized by heat in the presence of a catalyst selected from alkali metal hydroxides, alkaline earth metal hydroxides, alkali metal fluorides, alkaline earth metal fluorides and triethylamine.

Abstract: Organic silicon compounds comprising in the molecule thereof, a polysilane structural unit: -(R.sup.1 R.sup.2 Si).sub.n - and a structural unit: R.sup.3.sub.a SiO.sub.(4-a)/2 absorb UV in the range of 300-400 nm and are well soluble in organic solvent. These compounds are useful UV absorbers for cosmetic compositions.

Abstract: A room temperature-curable organopolysiloxane composition capable of giving a highly oil-resistant cured silicone rubber is disclosed. The composition comprises, as the essential ingredients, a hydroxy-terminated diorganopolysiloxane, an iminoxysilane compound as a crosslinking agent, an organotin compound as a catalyst and, as an oil-resistance improver, a combination of zinc carbonate and zinc hydroxide in a powdery form of which the content of zinc hydroxide is, different from conventional basic zinc carbonate, 5 to 50% by weight. By virtue of this unique ingredient, the composition is also advantageous in respect of the high storage stability.

Abstract: An organopolysiloxane gel composition improved upon discoloration due to thermal deterioration, which comprises (A) 100 pts. wt. of an organopolysiloxane containing alkenyl groups in side chains, (B) a specified amount of an organohydrogenpolysiloxane containing on the statistical average one terminal hydrogen and one terminal alkenyl group, and (C) a catalytic amount of addition reaction catalyst.

Abstract: A novel endermic medicament having a consistency of a gel is proposed which is formulated, as a gel base, with non-ionic water-soluble cellulose ether, e.g., methyl cellulose and hydroxypropyl methyl cellulose, modified with a modification agent containing, in the molecule, an alkyl group having 6 to 26 carbon atoms and a functional group having reactivity with the hydroxyl group in the cellulose ether, e.g., stearyl glycidyl ether, decyl glycidyl ether and cetyl epoxide. The endermic medicament formulated with the modified cellulose ether is stable by virtue of the very little interaction between the active ingredients and the gel base and also can exhibit high percutaneous absorptivity of the active ingredients through the human skin.

Abstract: Cyclopentyl trichlorosilane can be efficiently prepared by the hydrosiliaton reaction of trichlorosilane and cyclopentene which can proceed only to a very low extent by the use of conventional platinum catalysts effective in other hydrosilation reactions. Thus, an equimolar mixture of the reactants is heated in the presence of a chlorine-deficient chloroplatinic acid catalyst of a specified chlorine:platinum atomic ratio at a temperature higher than the boiling point of the mixture under normal pressure in a pressurizable vessel so that the desired product can be obtained in a yield of 90% of the theoretical value or higher.

Abstract: An electroconductive silicone rubber having a high electroconductivity and retaining the good workability in compounding and molding and excellent properties inherent in silicone rubbers in general can be obtained by compounding a curable organopolysiloxane composition comprising a gum-like diorganopolysiloxane, carbon black as a conductivity-imparting agent and a curing agent with a cured silicone rubber powder of spherical particle configuration having specified particle diameter and specified sphericity which partially replaces the diorganopolysiloxane gum.

Abstract: A novel and efficient method is proposed for the synthetic preparation of a long-chain alkynyl compound in a one-pot reaction without isolating the intermediate from the reaction mixture. The inventive method comprises the steps of: (a) a Grignard coupling reaction of an .omega.-halogeno-1-alkynyl magnesium halide compound of the general formula X.sup.1 MgC.tbd.C(CH.sub.2).sub.n X.sup.2, in which X.sup.1 is a halogen atom, X.sup.2 is an atom of Br or I and n is 3 to 10, and a Grignard reagent of the general formula RMgX.sup.1, in which R is a group selected from the class consisting of alkyl groups, alkenyl groups, alkynyl groups, alkapolyenyl groups, aryl groups and hydrocarbon groups having protected hydroxy group to give an intermediate compound of the general formula X.sup.1 MgC.tbd.C(CH.sub.2).sub.n R; (b) subjecting the intermediate compound to a reaction with a reactant selected from the class consisting of C.sub.2 -synthons, C.sub.

Abstract: A highly corrosion-resistant rare earth-, e.g., neodymium-, based sintered permanent magnet is proposed which is characterized by the specific chemical composition of the magnet alloy including cobalt and/or chromium in a specified atomic percentage, by the density of the sintered body of at least 95% of the density of the alloy ingot and by the corrosion-resistant surface film formed on the surface of the sintered body by a specific method. By virtue of the favorable conditions against corrosion including the specific chemical composition of the magnet alloy and the high density of the sintered body, these conditions are also favorable for enhancing the adhesion of the corrosion-resistant coating film to the surface of the sintered body.

Abstract: A silicone emulsion composition, comprising:(A) 100 parts by weight of a silicone oil compound essentially consisting of from 70 to 99% by weight of an organopolysiloxane and from 30 to 1% by weight of finely powdered silica; and(B) from 3 to 40 parts by weight of a mixed emulsifying agent having an HLB of from 7.0 to 8.5, consisting of (B-1) from 50 to 75% by weight of a sorbitan fatty acid ester with an HLB of from 2.0 to 6.5, (B-2) from 5 to 40% by weight of polyoxyethylene sorbitan fatty acid ester with an HLB of from 6.0 to 16.0, and (B-3) from 5 to 30 parts by weight of a compound selected from the group consisting of a polyoxyethylene higher alcohol ether and a polyoxyethylene alkylphenol ether, each having an HLB of from 12.0 to 19.5. This emulsion has a low viscosity, good dilution property and good stability.