Abstract: An apparatus for manufacturing capsules which causes a solution of thermo-gelling material to gelatinize, and then drys the gel, whereby the process of manufacturing capsules is less affected by drying conditions, thus providing capsules of uniform wall thickness without wrinkles. In the apparatus of this invention, circulating capsule pins are dipped in the solution of thermo-gelling material, thus the solution adheres to the pins, and, the pins are rotated upside down, thus thickness of the solution adhering to the pins becomes uniform. Then, the pins are retained in the vessel maintained at a higher temperature than the gelling temperature of the solution, and the solution adhering to the pins is accelerated to gelatinization. The formed gel is dried in a drying device, and the dried gel bodies, i.e. capsules, are removed from the capsule pins.

Abstract: Organosilicon compounds of a novel class are disclosed including .alpha.,.omega.-bis(alkoxy silyl)-substituted alkane compounds represented by the general formula(RO).sub.m (CH.sub.3).sub.3-m Si--CH.sub.2).sub.n Si(CH.sub.3).sub.3-m (OR).sub.m,in which R is a monovalent hydrocarbon group having 1 to 4 carbon atoms, e.g., methyl and ethyl, the subscript n is a positive integer in the range from 10 to 18 and the subscript m is 1, 2 or 3. The compound is useful as an additive in various kinds of synthetic resin-based compositions for the purpose of improving the properties such as flexibility, weatherability, cold resistance and mechanical strengths.

Abstract: Perfluoroalkyl group containing organopolysiloxanes having a high degree of polymerization can be prepared by reacting a liquid organopolysiloxane of formula (I): R.sup.1.sub.aR.sup.2.sub.b (OH).sub.c SiO.sub.[4.(a+b+c)]/2 with an alkali metal hydroxide to form an alkali metal silanolate; reacting the alkali metal silanolate with a perfluoroalkyl group-containing organosilane of formula (II): RfR.sup.3 SiX.sub.2 to synthesize a perfluoroalkyl group-containing organopolysiloxane intermediate of formula (III): [(R.sup.1.sub.a R.sup.2.sub.b SiO).sub.m (RfR.sup.3 SiO)].sub.n ; and polymerizing the intermediate of formula (III) or a mixture of the intermediate and an organopolysiloxane of formula (IV): R.sup.5.sub.e R.sup.6.sub.g SiO.sub.[(4.(e+g)]/2 in the presence of a strongly acidic catalyst or strongly basic catalyst.

Abstract: A photocurable organopolysiloxane composition comprising an organopolysiloxane having at least one photocurable acryloxyorganosilyl group in the molecule, a polyether-modified organopolysiloxane and a photo-initiator. The composition has good peelable protective properties after curing and heating, for example, in hot solder bath.

Abstract: A primer composition dilluted with a suitable organic solvent comprising (A) an organic copolymer comprising an alkoxysilylated monomer, vinyl acetate and other monomers copolymerizable therewith, (B) a polyalkyl (meth)acrylate, (C) a crosslinking agent for said copolymer (A), and (D) an ultraviolet absorber. This primer composition is a very effective primer in forming an organopolysiloxane coating layer excellent in adhesion, endurance, weathering resistance of the surface of a molded article of a thermoplastic resin.

Abstract: An inner tube for use in a semiconductor diffusion furnace is provided comprising a liner or diffusion tube and an insulating layer formed on the entire outer surface of the tube by spraying, typically plasma spraying. The sprayed insulating layer is resistant to deterioration and peeling, ensuring an extended period of service for the tube.

Abstract: A silicone-based fabric finishing agent which comprises: an aminoalkyl-substituted diorganopolysiloxane; a reaction product of an aminoalkyl-substituted organopolysiloxane and an epoxy-containing organic compound; a hydrolysis product of an epoxy-containing hydrolyzable organosilane coupound; and, optionally, an aminoalkyl-substituted organopolysiloxane having a specified viscosity, each in a specified proportion is particularly suitable for the softening treatment of waddings of synthetic fibers, e.g., polyester fibers, and advantageous over conventional silicone-based fabric treatment agents with respect to the excellent softness and smoothness of the treated wadding, which is freed from the problem of discoloration or yellowing caused in the course of the heat treatment and by the lapse of time, as well as the durability of these effects to withstand dry cleaning.

Abstract: A novel silane coupling agent is proposed for the pretreatment of a glass fiber-based or mica flake-based inorganic reinforcing material prior to compounding with an epoxy resin or a polyimide resin as the matrix to give a composite material such as laminates having excellent heat resistance against molten solder alloy and resistance against heat shock. The principal ingredient of the treatment solution is a trialkoxysilylalkyl-substituted polymethylene diamine compound of the general formula (R.sup.1 O).sub.3 SiR.sup.2 NH(CH.sub.2).sub.n NHCH.sub.2 C.sub.6 H.sub.5, in which R.sup.1 is a methyl or ethyl group, R.sup.2 is a diavalent hydrocarbon group having 1 to 6 carbon atoms, e.g., methylene and propylene, and n is an integer of 4 to 8, or a hydrochloride thereof. This diamine compound is soluble in water, in particular, acidified with acetic acid and the aqueous solution is advantageously stable in storage as compared with conventional silane coupling agents.

Abstract: A hard coating composition comprising an organic silicon compound and inorganic submicron particles such as silica sol and antimony oxide sol is improved in curing properties and shelf stability by blending aluminum perchlorate as the curing catalyst.

Abstract: The primer composition of the invention is particularly useful as an undercoating composition for a protective overcoating formed with a silicone-based coating composition containing a colloidal silica powder in respect of the excellent adhesion, heat resistance, resistance against hot water and weatherability of the overcoating layer.

Abstract: The invention provides a diorganopolysiloxane having a hydroxy- and amino-functional reactive group bonded only to one of the terminal silicon atoms of the linear molecular chain ends. The diorganopolysiloxane compound, which is useful as a modifying agent of various kinds of synthetic resins, is represented by the general formulaR.sub.3 Si--O--SiR.sub.2 --O.sub.n SiR.sub.2 --CH.sub.2 CH.sub.2 CH.sub.2 OCH.sub.2 CHOHCH.sub.2 NR.sup.1 R.sup.2,in which R is a monovalent hydrocarbon group, R.sup.1 and R.sup.2 are each a hydrogen atom or a monovalent hydrocarbon group selected from the class consisting of alkyl groups having 1 to 18 carbon atoms and aryl groups having 6 to 15 carbon atoms, at least one of R.sup.1 and R.sup.2 being not a hydrogen atom, or R.sup.1 and R.sup.2 are each a divalent group jointly forming a morpholino group together with the nitgoren atom and the subscript n is zero or a positive integer not exceeding 1000.

Abstract: A water repellency treatment agent which is non-corrosive to metals, comprising a solution as a volatile solvent of 1-20 wt % of silyl phosphate containing 1-10 wt % of phosphorus, and less than 20 wt % of an organopolysiloxane of general formula R.sub.a SiO.sub.(4-a)/2 having a viscosity of 5-10,000 centistokes at 25.degree. C., wherein the letter a has a value in the range 1.95<a<2.20, and R is a monovalent organic group selected from saturated or unsaturated monovalent hydrocarbon groups with 1-30 carbon atoms, halogenated hydrocarbon groups, alkoxy groups, hydroxyl groups and hydrogen atoms.

Abstract: A method for manufacturing synthetic silica glass by reacting methyl silicate and aqueous ammonia, dispersing the silica particles produced in water, solidifying the silica by the addition of methyl silicate and heating, dehydrating, de-solventing, decarburizing and sintering the solid silica to produce a glass product. The sintered glass may be pulverized to produce a powder. The inventive method is easily carried out and avoids the high energy costs of the prior art. The glass product obtained exhibits excellent high temperature viscosity.

Abstract: A foamable silicone rubber composition comprising:(A) a particular diorganopolysiloxane,(B) a powdery silica filler,(C) a particular conductive metallic oxide powder,(D) a foaming agent, and(E) a vulcanizing agent. This composition can be cured by ultra high frequency vulcanization to produce a cured silicone rubber foam.

Abstract: A composition comprising iodotrimethylsilane in admixture with a polysiloxane is shelf stable for a long time and effective in various organic synthetic reactions.

Abstract: A room temperature curable resin composition comprising a copolymer of (A) with (B) shown below:(A) An acrylic group-containing silane compound represented by the following Formula (I): ##STR1## wherein R.sup.1 represents a monovalent hydrocarbon group; R.sub.2 represents an alkylene group having not less than 2 carbon atoms; R.sup.3 and R.sup.4 each represent a hydrogen atom or a methyl group; m represents 0, 1 or 2; and n represents an integer of not less than 1.(B) A compound having an unsaturated group copolymerizable with said component (A) acrylic group-containing silane compound. This composition can be cured at an accelerated rate not only at the surface but also at the depths thereof, and may crack with difficulty after cured.

Abstract: A powder feeding apparatus comprising a holding hopper for holding a powder, a metering hopper for metering the powder from the holding hopper, a mechanism for opening and closing a discharge opening in the metering hopper, a controller for controlling the hopper opening-closing mechanism, and a trough where the powder discharged in a heap from the metering hopper is smoothed into a layer.

Abstract: The pasty organopolysiloxane composition is compounded from a methyl phenyl polysiloxane fluid and 5 to 50% by weight of a fatty acid ester of saccharose. The composition is highly transparent and useful as a base of various kinds of pasty preparations for cosmetic and medicinal uses to give an advantage of refreshed feeling without stickiness to the person using the preparation by applying to the skin after wiping off because the composition is free from the problem of powdery residue when the preparation on the skin has been wiped off.

Abstract: A method for the preparation of a stable silica organosol in a hydrophobic organic solvent is proposed. The method comprises (a) hydrolyzing a tetraalkoxy silane, e.g. tetraethoxy silane, in an alcoholic medium in the presence of a limited amount of water and ammonia as a catalyst under controlled conditions so as to produce a silica alcosol in which the silica particles satisfy the requirements that the alkoxy groups and silanolic hydroxy groups are bonded to the silicon atoms on the surface in densities of at least 3.5 .mu. moles/m.sup.2 and not exceeding 2 .mu. mmoles/m.sup.2, respectively, and the specific surface area S given in m.sup.2 /g and the average particle diameter D given in nm of the silica particles satisfy the relationship of S.times.D.gtoreq.5000, D being 1 nm or larger, and (b) admixing the alcosol of silica particles with an organosilicon compound selected from the group consisting of the compounds represented by the general formula R.sub.4-n SiX.sub.n, (R.sub.3 Si).sub.

Abstract: A novel method is proposed for the preparation of a curable organopolysiloxane composition which is suitable as a material of a mold-making having excellent mechanical properties and durability in use for replica molding. The method comprises (a) blending a vinyl-containing organopolysiloxane with a hydrophobic reinforcing silica filler and hexamethyl disilazane, optionally, together with water each in a limited amount, (b) subjecting the blend to a heat treatment and (c) admixing the heat-treated blend with an organohydrogenpolysiloxane as a crosslinking agent of the vinyl-containing organopolysiloxane and a platinum compound as a catalyst for promoting the addition reaction between the silicon-bonded vinyl groups and the silicon-bonded hydrogen atoms.