Abstract: An aqueous silicone emulsion which crosslinks by a Michael addition reaction, yielding a cured composition upon removal of the water has been prepared. The aqueous silicone emulsion comprises the product formed by mixing an organosiloxane polymer containing at least two Michael acceptor groups per organosiloxane molecule, water, a surfactant and an effective amount of a crosslinker having sufficient reactive hydrogens of a Michael donor per crosslinker molecule. The invention also describes a method for making these silicone emulsions.

Abstract: A method of spontaneously forming a highly stable clear microemulsion by combining (i) water; (ii) a volatile cyclic methyl siloxane or volatile linear methyl siloxane; and (iii) a silicone polyether surfactant. The amounts of each component are such that the composition is in the form of a microemulsion. The volatile methyl siloxane is present in the microemulsion in the form of particles having an average diameter of less than about 100 nanometers. The microemulsion is useful in personal care products.

Abstract: Disclosed is a resin composition excellent in mechanical and electrical properties. The composition contains an inorganic filler such as fused silica or silicon nitride having the surface covered with a substance resulting from decomposition of a polysilane compound and a base resin such as an epoxy resin or a maleimide resin.

Abstract: A curable composition includes (A) 100 parts by weight of an oxypropylene polymer having groups containing silicon atoms bonded to a hydroxy group and/or a hydrolyzable group and capable of crosslinking by forming a siloxane bond, a maximum Mw/Mn of 1.6, and an average molecular weight of at least 6,000, (B) from 100 to 200 parts by weight of calcium carbonate containing at least 30% by weight calcium carbonate of an average particle size of not larger than 0.5 .mu.m and surface-treated with a fatty acid, (C) from 30 to 100 parts by weight of a plasticizer containing at least 5% by weight phthalic acid ester plasticizer, (D) from 0.5 to 10 parts by weight of a compound represented by the formula R.sup.1 Si(OCH.sub.3).sub.3 and/or Si(OCH.sub.2 CH.sub.3).sub.4 (wherein R.sup.1 represents a monovalent organic group containing no amino groups), (E) from 0.5 to 10 parts by weight of a compound represented by following formula (1), and (F) from 0.

Abstract: Disclosed is a styrene polymer composition comprising, in a specified proportion,(A) a styrene polymer having no functional group,(B) either of polyphenylene ether having a polar group or a mixture of polyphenylene ether having a polar group and a styrene polymer having no functional group; and(C) polyamide.These polymer compositions are excellent in impact resistance, water resistance, and mechanical properties, and are suitable for various purposes.

Abstract: A surface-segregatable, melt-extrudable thermoplastic composition is provided which includes at least one thermoplastic polyolefin and at least one additive having the general formula, ##STR1## in which: (A) R.sub.1 -R.sub.9 are independently selected monovalent C.sub.1 -C.sub.3 alkyl groups;(B) R.sub.10 is hydrogen or a monovalent C.sub.1 -C.sub.3 alkyl group;(C) m represents an integer of from 1 to about 4;(D) n represents an integer of from 0 to about 3;(E) the sum of m and n is in the range of from 1 to about 4;(F) p represents an integer of from 0 to about 5;(G) x represents an integer of from 1 to about 10;(H) y represents an integer of from 0 to about 5;(I) the ratio of x to y is equal to or greater than 2;(J) the additive has a molecular weight of from about 350 to about 1,400; and(K) the additive is present in an amount of from about 0.5 to about 5 percent by weight, based on the amount of thermoplastic polyolefin.

Abstract: The present invention provides for microporous ceramic materials having a surface area in excess of 100 m.sup.2 /gm and an open microporous cell structure wherein the micropores have a mean width of less than 20 Angstroms and wherein said microporous structure comprises a volume of greater than about 0.05 cm.sup.3 /gm of the ceramic. The pyrolysis product of ceramic precursor oligomers or polymers having a number average molecular weight in the range of from about 200 to about 100,000 g/mole in an ammonia atmosphere at temperatures of up to less than about 1200.degree. C. gives rise to the microporous ceramics of the invention. Also provided is a process for the preparation of the microporous ceramics of the invention involving pyrolysis of the ceramic precursor under controlled conditions of heating and with intermediate hold times, up to temperatures of less than 1200.degree. C., preferably less than 1000.degree. C., to form a microporous ceramic product.

Abstract: A dry, non-oily, non-greasy, rubber or vinyl surface protectant contains a silicone component and an acrylic component in its formulation. When only the silicone component is applied to rubber and vinyl surfaces, the surfaces become glossy but feel oily. When only the acrylic component is applied, they are glossy and feel dry but are tacky and draggy as if a heavy residue was present. When components are blended and applied to rubber and vinyl surfaces, the surfaces have a dry shine with good gloss and feel completely dry. The treated surfaces are also not tacky and give no sensation of heavy residue presence.

Abstract: An exercise putty kit for providing manipulative physical therapy of increasing difficulty comprises a container (12) of a large mass (14) of borosiloxane putty and a package (16) of borosiloxane or siloxane putty. At least one small mass (18-32) is provided to the patient along with the large mass (14), the small mass and large mass being manipulated by the patient until a uniform color and stiffness are achieved in the combined mass (38). Preferably, a plurality of small masses (18-32) having a variety of colors are available for successive manipulation with the combined mass (38). The kit provides a means by which the difficulty of manipulative physical therapy may be monitored and increased. As more small masses (18-32) are added to the combined mass (38), the stiffness increases, requiring more manipulation to fully blend the masses.

Abstract: A novel cyclotrisiloxane having the following general formula (1) and a novel copolymer synthesized using the cyclotrisiloxane are provided. The copolymer is excellent in low-temperature characteristics, heat resistance, temperature-viscosity characteristics, and compatibility with various fluids and is particularly useful as a starting material for use in cosmetics and greases. ##STR1## wherein R.sup.2 is a hydrogen atom, an alkyl group, an aryl group, an aralkyl group, a halogenated alkyl group, an alkenyl group, an acryloyloxypropyl group or a methacryloyloxypropyl group, and R.sup.3 is a methyl group or a phenyl group.

Abstract: In a semiconductive silicone elastomer composition comprising an organopolysiloxane containing at least two aliphatic unsaturated hydrocarbon groups attached to a silicon atom, an organohydrogenpolysiloxane containing at least two hydrogen atoms attached to a silicon atom, and a conductive agent, the conductive agent consists of 1-10 wt % of conductive carbon and 99-90 wt % of a conductive filler having a volume resistivity of 10.sup.1 -10.sup.8 .OMEGA.-cm other than the conductive carbon. The conductive agent is blended in an amount of 20-60 wt % of the entire composition. The composition having the conductive agent uniformly dispersed therein yields a semiconductive silicone elastomer having a volume resistivity of 10.sup.5 -10.sup.10 .OMEGA.-cm with a dispersity of 1 to 10.

Abstract: A process for preparing a room temperature-curable organopolysiloxane composition comprising (A) (A-1) a specific organopolysiloxane or a mixture of (A-1) and (A-2) a specific silicone compound or a partial hydrolysis product thereof, (B) silica powder having a specific surface area of 20 to 800 m.sup.2 /g, (C) a curing catalyst, and (D) a silane coupling agent or an organopolysiloxane having a specific substituent, which comprises adding component (D) to component (A) prior to kneading or at the time of kneading components (A) and (B). The composition exhibits excellent physical characteristics, excellent workability in terms of flowability, adhesion, and extrudability, undergoes no change in viscosity with time and, in particular, suffers no impairment of these characteristics when stored for a long period of time.

Abstract: A silicone rubber composition which can be used to provide a formed-in-place gasket which exhibits excellent pressure resistance immediately after its site application and cures into a highly pressure-resistant and strongly adherent silicone rubber gasket comprising (A) 100 weight parts of a mixture of comprising an alkoxy-substituted polyorganosiloxane and an alkenyl-substituted polyorganosiloxane; (B) a hydrogen-containing polyorganosiloxane an alkoxysilane; a condensation reaction catalyst; and platinum catalyst.

Abstract: A silicone composition is formed as a system including: a silicone compound, reactive group-containing modified silicic acid powder of which surface has been modified with an alkylsilane, a hexamethyldisilazane, a dimethylsilicone oil, or a mixture thereof, and an unsaturated group-containing silane compound; and inorganic fine powder carrying a surfactant. The silicone compound is preferably an addition reaction-type silicone rubber prepared from a dimethyl polysiloxane having a vinyl group, a methylhydrogenpolysiloxane and a platinum-based catalyst. The silicone composition is heat-cured to provide an elastic revolution body which is suitably used to constitute one or both of a fixing roller and a mating pressure roller in a roller fixing device for electrophotography.

Abstract: The invention relates to a tire with a tread. The tread is composed of three basic elastomers, namely, medium cis 1,4-polybutadiene rubber, isoprene/butadiene copolymer and natural cis 1,4-polyisoprene rubber and which is reinforced with either carbon black or a combination of carbon black and silica reinforcing fillers.

Abstract: An accelerator system for the cold crosslinking of polymers which harden on exposure to moisture by hydrolysis/condensation, comprising: (C) x parts by weight of a catalyst for crosslinking the said polymers by polycondensation, x ranging from 0.01 to 10; (E) Y parts by weight of a solid inorganic compound containing an amount y of water in the form of water of hydration and/or water adsorbed by capillary condensation, this amount y ranging from 0.5 to 40 parts by weight, and which can represent up to 70% of the weight of the said solid inorganic compound; (F) z parts by weight of fillers, z ranging from 0 to 50; (D) 100-(x+Y+z) parts by weight of a diluent or of a solvent of the said catalyst (C), the diluent or solvent having a dynamic viscosity at 25.degree. C. of the order of 50 to 200,000 mPa.s; the respective amounts of the four constituents (C), (E), (F) and (D) being such that the system obtained exists in the form of a manipulable paste.

Abstract: A curable silicone composition that cures at room temperature into a highly water-repellent, highly oil-repellent film is obtained from a composition of (A) an organopolysiloxane resin with the following average unit formulaR.sub.a (ZO).sub.b SiO.sub.(4-a-b)/2in which R represents substituted and unsubstituted monovalent hydrocarbon groups, Z is a hydrogen atom or C.sub.1 to C.sub.6 alkyl group, i has a value from 0.80 to 1.80, and b has a value that gives a content of 0.01 to 10 weight % silicon-bonded hydroxyl or alkoxy in the instant compound; (B) an organopolysiloxane each molecule of which contains at least one silylalkylene group with the following general formula bonded to main-chain silicon--R.sup.1 --SiR.sup.2.sub.(3-m) X.sub.mwherein R.sup.1 represents alkylene and alkyleneoxyalkylene groups; each R.sup.

Abstract: A process of making a polydiorganosiloxane-silica foundation mixture from a free-flowing, powdered, surface-modified, reinforcing silica-polydiorganosiloxane concentrate used to make, for example, RTV silicone sealant compositions which have non-sag properties. The foundation mixtures are made by combining, mixing, and heating a reinforcing silica filler and a surface modifying agent to a temperature of >90.degree. C. to <180.degree. C. using 0.1 to 0.5 parts by weight of the surface modifying agent per one part by weight of the silica. Polydiorganosiloxane is added gradually to the resulting fluidized filler over a time period of less than 10 minutes to obtain the free flowing powdered reinforcing silica-polydiorganosiloxane concentrate. The foundation mixture is obtained by massing the concentrate and adding more polydiorganosiloxane to obtain a mixture which has from 8 to 20 weight percent silica filler.

Abstract: A process of making a polydiorganosiloxane-silica foundation mixture from a free-flowing, powdered, surface-modified, reinforcing silica-polydiorganosiloxane concentrate used to make, for example, RTV silicone sealant compositions which have non-sag properties. The foundation mixtures are made by combining, mixing, and heating a reinforcing silica filler and a diol surface modifying agent to a temperature of 20.degree. C. to <180.degree. C. using 0.05 to 0.5 parts by weight of the diol per one part by weight of the silica. Polydiorganosiloxane is added gradually to the resulting fluidized filler over a time period of less than 10 minutes to obtain the free flowing powdered reinforcing silica-polydiorganosiloxane concentrate. The foundation mixture is obtained by massing the concentrate and adding more polydiorganosiloxane to obtain a mixture which has from 5 to 20 weight percent silica filler. The foundation mixtures have a plateau stress of >700 dynes/cm.sup.

Abstract: Oligomers wherein phenylalkylsiloxane units comprise at least a portion of the repeating units increase the ability to penetrate porous substrates that is exhibited by crosslinkable liquid organosiloxane compositions containing polyorganosiloxanes when the oligomer exhibits limited compatibility with the crosslinkable polyorganosiloxane(s) present in the curable organosiloxane composition.