Abstract: Silicone mold compositions are provided which exhibit low durometer and high tear strength properties and comprise a main filler of precipitated silica and a reinforcing co-filler selected from acicular CaSiO.sub.3 fillers, fumed aluminum oxide fillers, and spherical ceramic fillers. The co-fillers have large surface areas and small particle sizes. The co-fillers are used with alkoxy silane cross-linking agents of the formula (RO).sub.4 Si, particularly n-propylsilicate. Two-part silicone cure systems are provided which enable the rapid achievement of full die B tear strengths without the need for prolonged aging of these materials.

Abstract: By blending a silazane with an organic silicon polymer such as polycarbosilane and polysilazane and inorganic powder such as alumina and silica, there is obtained a coating composition which can be applied and baked onto metallic and non-metallic substrates to form dielectric coatings which are improved in many properties including substrate adhesion, hardness, electrical insulation, heat resistance, water resistance, and chemical resistance.

Abstract: A silicone rubber composition comprising (A) an organopolysiloxane, (B) an organic peroxide and (C) carbon black cures under anaerobic conditions into silicone rubber having improved physical properties. A composition further comprising (D) an organopolysiloxane copolymer consisting essentially of M and Q units in a molar M/Q ratio of 6/10 to 9/10 forms an anaerobic adhesive composition which is a useful sealant.

Abstract: Curable compositions including epoxy-functional compounds and polyenes, as well as cyclic polysiloxanes, and/or tetrahedral siloxysilanes, and/or linear polysiloxanes; along with, or instead of these polyenes and silicon compositions, crosslinkable prepolymers prepared from such polyenes and silicon compounds may be included. A curing agent, and yet additionally, a curing accelerator, may also be included. These compositions can be thermally cured, in the presence of hydrosilation catalysts.

Abstract: Curable compositions comprising (A) an organopolysiloxane of the following general formula (1): ##STR1## wherein R.sup.1 is hydrogen or methyl, R.sup.2 and R.sup.3 are monovalent hydrocarbon groups, and R.sup.4 is a divalent organic group, (B) a silane having an .alpha.-silylester group, (C) a photoinitiator, and (D) a curing catalyst. The compositions are both photo-curable and room-temperature-curable. When cured by irradiation with light, the compositions give cured products having good rubber properties.

Abstract: A method for the preparation of a powder mixture of cured silicone microparticles and inorganic microparticles is disclosed, said method comprising (I) forming a water-based suspension of (A) a plurality of cured silicone microparticles having an average diameter of 0.1 to 200 micrometers, (B) a plurality of inorganic microparticles having an average particle diameter of 0.1 to 200 micrometers and, optionally, (C) at least one surfactant; and (II) removing the water from said water-based suspension. The resultant powder mixture is relatively free from agglomeration and may be easily dispersed in organic resins to form a homogeneous mixture for such applications as paints and coatings.

Abstract: Self-adhesive silicone compositions having (A) an organopolysiloxane of the following average unit equation (1)(R.sup.1).sub.z --SiO.sub.(4-z)/2 (1)wherein R.sup.1 is either a substituted or an unsubstituted monovalent hydrocarbon group and Z is a number in the range from 1.98 to 2.01 having a viscosity at 25.degree. C. of at least 300 cSt,(B) an organic silicon compound which possesses at least one group expressed by the following equation (2) within the molecule: ##STR1## wherein R.sup.2 is a substituted or an unsubstituted monovalent hydrocarbon group, R.sup.3 and R.sup.4 are either a hydrogen atom, methyl group, or an ethyl group, and n is an integer of 0, 1, or 2, and(C) an organic peroxide. The silicone compositions strongly adhere onto various materials such as metals and plastics without the need of primer treatments.

Abstract: A binder composition for zinc dust paints contains silicic acid esters, solvents, curing agents, an anti-settling agent and n-butyl acetate. The composition has a flash point above 21.degree. C.

Abstract: Internal mould release compositions suitable for use in the production of moulded articles by the RIM process, comprise a blend of a metal salt of an organic acid and a polysiloxane polymer having isocyanate reactive organic groups and optionally a compatibilizing amount of an amidine or imidate compound.

Abstract: A liquid coating composition for the formation of a liquid crystal display element insulating film, which comprisesa) hydrolyzed product of tetraalkoxysilane of the general formula (1) below and trialkoxysilane of the general formula (2) below,b) an aluminum salt, andc) a deposition inhibitor, dissolved in an organic solvent.Si(OR).sub.4 (1)wherein R represents a C1-5 alkyl groupR.sup.1 Si(OR.sup.2).sub.3 (2)wherein R.sup.1 represents an alkyl, alkenyl or aryl group, and R.sup.2 represents a C1-5 alkyl group. The liquid coating composition according to the present invention is useful as an insulating film for a liquid crystal display element, as it exerts no adverse influence on the display property thereof.

Abstract: Heat cured silicone rubber compositions which contain a potassium aluminosilicate filler exhibit improved resistance to hydrocarbon oils. The potassium aluminosilicate filler has an average surface area of between about 5.0 and about 6.50 m.sup.2 /g, an average particle diameter of between about 1.0 and about 20.0 micrometers, and an average particle thickness of between about 0.5 and 1.0 micrometers. The filler improves retention of physical properties and resistance to swelling in hot hydrocarbon oils in a wide variety of siloxane compositions.

Abstract: A method of producing 0.01 to 70 wt. % aqueous solutions of sulfonated organosilicon compounds having the formula[(HO).sub.3 Si-R.sup.1 -SO.sub.3.sup.- ].sub.x M.sup.x+ (I)or oligomeric siloxane derivatives thereof, condensed via oxygen bridges. The solution optionally also contains compounds of formula (III) e.g., Si(OH).sub.4 or Al(OH).sub.3, or the like, or derivatives thereof condensed via oxygen bridges. The ratio of Si atoms of formula (I) to the sum of Si and/or Al atoms of formula (III) is 1:0 to 1:3, and the total concentration of compounds (I)+(III) is 0.01 to 70 wt. %. The starting material for the method is a polymeric di-, tri-, or tetrasulfane compound made up of units having the formula: ##STR1## wherein R.sup.1 has the same meaning as in formula (I), and y=2, 3 or 4. The starting material of formula (IV) is suspended in water. The suspension is mixed at 10.degree. to 100.degree. C. with hydrogen peroxide and is then agitated at 30.degree. to 150.degree. C.

Abstract: The invention provides organopolysiloxane compositions for a releasable substrate which are superior in curability, anti-static property, oil resistance, and slipperiness, and provide a good releasability to the treated objects, said composition comprising (1) 100 parts by weight of an organopolysiloxane which comprises at least two alkenyl groups and 5 to 50 mol % of a chemical unit expressed by formula (I) ##STR1## (2) 1 to 100 parts by weight of an organohydrogen polysiloxane which comprises at least three hydrogen atoms bonded to silicon atoms per molecule, and (3) a catalytic amount of platinum or platinum compound.

Abstract: A one-component moulding and sealing compound based on prepolymers with terminal silyl groups with at least one hydrolyzable substituent on the Si atom, organo-metallic tin compounds as the catalyst and also inorganic fillers containing a polyvinyl chloride and fatty acid amide having thixotropic effect to reduce surface tackiness.

Abstract: The present invention relates to a silicone rubber microsuspension which has an excellent high-concentration storage stability, and to a method for the preparation of a silicone rubber microsuspension. The silicone rubber microsuspension comprises a microparticulate silicone rubber having an average particle diameter not exceeding 10 micrometers, a nonionic surfactant whose HLB value is less than 10, a nonionic surfactant whose HLB value is at least 10, and water, with the proviso that the content of the microparticulate silicone rubber in the silicone rubber microsuspension is at least 50 weight percent. The method for the preparation of said silicone rubber microsuspension comprises mixing a liquid silicone rubber composition, a nonionic surfactant having an HLB value of less than 10, a nonionic surfactant having an HLB value of at least 10, and water.

Abstract: The release film-forming organopolysiloxane composition in accordance with the present invention is characterized by its ability to cure rapidly at relatively low temperatures not exceeding 100.degree. C. to yield a cured film that is strongly adherent for the surface of various types of substrates (e.g., synthetic films, paper, polyethylene-laminated paper, etc.) and that also exhibits excellent release properties for tacky substances.

Abstract: A poysiloxane resin composition includes a blend of silanols, colloidal silica, an ultraviolet-absorbing material, and a dye for correcting the color of a film formed from the resin composition. The silanols include a silanol from the group having the formula R.sub.w Si(OH).sub.x or R.sub.y Si(OR').sub.z where (w+x) or (y+z)=4, and R and R' are organic radicals without any crosslinking sites, silanol from the group having the formula R"Si(OR'").sub.3 where R" is a hydrogen atom or an organic radical and R"' is an organic radical containing a crosslinking site. The resin may be cured at 420.degree. F. The ultraviolet-absorbing material may be a benzophenone, a benzotriazole, or a benzothiazole. A process for forming the resin composition includes reacting the silanols and the ultraviolet-absorbing material under continuous agitation for about six hours.

Abstract: A coating composition capable of forming a transparent coating having a high refractive index, excellent dyeing properties and scratch resistance on a transparent solid material, the coating composition comprising:(A) 100 parts by weight of an epoxy group-containing silicon compound or a partial hydrolysis product thereof,(B) 0 to 100 parts by weight of an organosilicon compound or a partial hydrolysis product thereof,(C) a metal oxide sol containing 0 to 130 parts by weight of at least one metal oxide selected from the group consisting of antimony oxide, tin oxide and titanium oxide,(D) 0.25 to 30 parts by weight of a polybasic carboxylic acid or an acid anhydride thereof, or a bisphenol compound, and(E) 0.01 to 30 parts by weight of a curing catalyst, ora molded article formed by coating a transparent solid material with the above coating composition as a coating layer-forming component.

Abstract: During radiotherapy for malignant conditions, healthy tissues can suffer from radiation damage. Traditional radiation shields designed to protect healthy tissues are prepared by a lengthy, multi-step complex procedure. Materials are described for preparation of a radiation shield for use during radiation therapy, especially therapy of the head and neck, where the material comprises a composite of non-radioactive, non-toxic high atomic density metal or metal alloy spherical particles dispersed in a manually moldable elastomeric material. Custom radiation shields are formulated of this material without the need for use of impressions or molds. Healthy tissues may then be shielded during radiation therapy by positioning the custom-fitted radiation shield in the desired location on the patient's body.

Abstract: The electrical conductivity of room temperature curable compositions containing at one polyorganosiloxane, a curing agent and certain light colored electrically conductive fillers is increased while maintaining the viscosity at desirably low levels and not adversely affecting the physical properties of the cured composition when the curable polyorganosiloxane is blended with the curing agent prior to addition of the filler.