Abstract: A conductive silicone rubber composition comprises a conductive silicone rubber composition comprising:(a) an organopolysiloxane of the following general formula (1): ##EQU1## wherein R.sup.1 is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 10 carbon atoms and "a" is a positive number of 1.90 to 2.05,(b) conductive carbon black, and(c) an organic peroxide of the following general formula (2): ##STR1## wherein X is --CH.sub.2).sub.n in which "n" is an integer of 2 to 8 or ##STR2## and R.sup.2 and R.sup.3 are independently selected from monovalent hydrocarbon groups having 3 to 10 carbon atoms and --SiR.sub.3.sup.4 in which R.sup.4 is a methyl, ethyl or phenyl group.

Abstract: The present invention provides a heat-curable fluorosilicone rubber composition to be cured by hydrosilation reactions and having outstanding physical properties, especially improved transparency and processability, said composition comprising(A) a polydiorganosiloxane having at least two unsaturated aliphatic hydrocarbon groups and represented by the general formula (1):R.sub.a.sup.1 SiO.sub.(4-a)/2 ( 1)wherein R.sup.1 represents a substituted or unsubstituted monovalent hydrocarbon group containing 0.01 to 15 mole % of an unsaturated aliphatic hydrocarbon group, a is a positive number of from 1.95 to 2.05.(B) a polyorganohydrogensiloxane having at least three hydrogen atoms directly bonded to silicon atoms in a molecule and represented by the general formula: ##STR1## wherein R.sup.2, R.sup.3 and R.sup.4 independently represents a substituted or unsubstituted monovalent hydrocarbon group, X represents CF.sub.2 or C.sub.3 F.sub.

Abstract: A silicone putty composition having high impact resilience immediately after preparation and providing a soft silicone putty having low plasticity is obtained by blending (1) a diorganosiloxane of the formula:R.sub.n SiO.sub.(4-n)/2wherein R is a substituted or unsubstituted monovalent hydrocarbon group and n is a number of from 1.98 to 2.02, (2) an organopolysiloxane having a terminal alkoxy group, (3) boric acid or boron oxide, and (4) liquid paraffin. The composition is suited for use in toys and dampers.

Abstract: A coating composition for the air bag which comprises(A) an organopolysiloxane having a viscosity of 300 cSt or more at 25.degree. C. which is represented by the average composition formula (1) below;R.sub.a.sup.1 SiO.sub.(4-a)/2 (1)(where R.sup.1 denotes a substituted or unsubstituted monovalent hydrocarbon group, and a is a positive number from 1.98 to 2.01.)(B) An organosilane or a partial hydrolyzate thereof having an isocyanate group and a hydrolyzable group in the molecule.(C) An organic peroxide.(D) An organohydrogenpolysiloxane having in the molecule three or more .tbd.SiH groups.It exhibits good self-adhesiveness and gives rise to a coating film which firmly bonds to a base cloth of polyamide or polyester. The adhesion remains stable for a long period of time. In addition, the coating film is almost non-tacky because the coating composition is cured well even by an organic peroxide.

Abstract: A silicone rubber laminate including a conductive layer of cured silicone rubber containing carbon black and a dielectric layer of cured silicone rubber stacked and integrated to each other. The bonding force is enhanced by applying to the conductive layer a dielectric uncured silicone rubber composition comprising (a) an organopolysiloxane containing at least two alkenyl groups per molecule, (b) an organopolysiloxane containing at least two SiH groups per molecule, (c) reinforcing silica, (d) an organic silicon compound having an alkenyl group per molecule, and (e) a platinum catalyst, the molar ratio of the SiH group in component (b) to the total alkenyl group in components (a) and (d) ranging from 1:1 to 4:1, and curing the composition.

Abstract: Silicone rubber compositions based on an organopolysiloxane are improved in release properties by blending a silane having both a fluorinated hydrocarbon group and an alkanoyloxy group and/or an organopolysiloxane having an alkanoyloxy or alkanoyloxyalkyl group.

Abstract: The silicone rubber composition of the present invention is characterized by using a diorganopolysiloxane having an average degree of polymerization of 3,000 to 30,000 in combination with a low-molecular weight of phenyl-group-containing organopolysiloxane having the following formula: ##STR1## wherein R.sup.1 represents a phenyl group, R.sup.2 and R.sup.3 each represent a monovalent hydrocarbon group having 1 to 10 carbon atoms, and n is 1 or 2.The composition can form a vulcanized molded item having excellent properties such as excellent storage stability, heat resistance, and fire resistance without causing blooming.

Abstract: A silicone rubber composition comprising an organopolysiloxane and a curing agent is improved by adding a foaming agent in an amount of 0.1 to 10 parts by weight per 100 parts by weight of the organopolysiloxane. The composition is heat curable into silicone rubber films or coatings which are substantially unfoamed and tack-free on a surface.

Abstract: A foamable silicone rubber composition comprising (A) a diorganopolysiloxane having a viscosity of at least 10.sup.6 cs at 25.degree. C., (B) an organohydrogenpolysiloxane, (C) a platinum catalyst, (D) azodicarbonamide foaming agent, and (E) an acetylenic alcohol reaction controlling agent is foamed and cured, preferably through UHF vulcanization, into silicone rubber sponge. The sponge having satisfactory strength and foam properties is obtained without a hygienic problem.

Abstract: A conductive rubber composition is prepared by blending (A) a rubber composition including natural and/or synthetic rubber and conductive carbon black, with (B) a silicone rubber composition including an organopolysiloxane having the average composition formula: R.sub.n SiO.sub.(4-n)/2 wherein R is a hydrocarbon group and n is a positive number of from 1.95 to 2.05. This rubber composition and cured products thereof have stable electric resistivity in the semiconductive range and are thus suitable as rubber roll members in business machines.

Abstract: A silicone rubber composition comprising: (A) a diorganopolysiloxane, (B) a reinforcing filler, (C) an acid strength adjustor, and (D) a curing agent, wherein the extract water pH is in the range of 3.0 to 5.5, said extract water pH being defined in such a way that when 50 g of a toluene solution containing 5.0% by weight of said rubber composition is subjected to extraction with 10 g of deionized water, the pH of the resulting water is defined as the extract water pH. The cured product of said composition is good in extension fatigue resistance and flex fatigue resistance.

Abstract: A silicone rubber composition having excellent workability and extrusion-moldability and capable of giving cured silicone rubber articles having good mechanical properties is proposed, which is prepared by admixing, in addition to the conventional ingredients of an organopolysiloxane gum, a finely divided reinforcing silica filler and a curing agent such as an organic peroxide, a low molecular-weight organopolysiloxane having, in a molecule, at least three silanolic hydroxy groups which serves as a wetting agent of the silica filler so as to improve the compatibility of the silica filler with the organopolysiloxane gum giving a possibility of increasing the amount of the silica filler without adverse influences such as a decrease in the plasticity of the composition.

Abstract: An acrylic rubber composition is proposed which is improved in respect of the extrusion-moldability as well as the surface slipperiness of the vulcanized article obtained therefrom. The composition comprises (a) an acrylic rubbery cooplymer which is a copolymer of a (meth)acrylic ester and a coolymerizable organosilicon compound having a silicon-bonded vinyl group in a molecule, (b) a reinforcing filler, (c) a powder of spherical particles having a specified average particle diameter and (d) an organic peroxide as a vulcanizing agent. The composition can be compounded further with a blowing agent to give a foamable rubber composition capable of being vulcanized into a spongy rubber body exhibiting excellent feeling on touch and slipperiness in contact with human skin to be useful, for example, as a material of cosmetic puffs.

Abstract: A process for preparing a silicone sponge roll, which comprises uniformly mixing a foamable silicone composition comprising (A) a vinyl-free organopolysiloxane R.sub.a SiO.sub.(4-a)/2 wherein R is a monovalent hydrocarbon or hydroxyl group and a is 1.95 to 2.05, (B) a finely divided silica filler, (C) an azodicarbonamide foaming agent, and (D) a diacyl peroxide, thereafter extruding the composition through an extruder, and thereafter foaming and vulcanizing the composition. The silicon sponge roll produced is suitable to form a fixing roll for use in electrographic copying machines.

Abstract: An area of image information read by a scanner is designated by a mouse to designate a part of the image information as retrieval information. The designated part of the image information is recognized in an OCR as the retrieval information which is then stored in an information recording medium in association with the image information.

Abstract: Silicone rubber is adhered to a metal surface by coating the metal surface with an organopolysiloxane adhesion improving agent of the formula: ##STR1## wherein R.sup.1 is a monovalent organic radical of from 2 to 8 carbon atoms which contains an unsaturated bond, R.sup.2 is a substituted or unsubstituted monovalent hydrocarbon radical of from 1 to 10 carbon atoms which contains no unsaturated bond, a is a number in the range of 1<a<4, and b is a number in the range of 0.ltoreq.b<2, with the proviso that a+b is<4, and having a polymerization degree of from 2 to 1000, placing an unvulcanized silicone rubber on the coated surface, and vulcanizing the unvulcanized rubber.

Abstract: A primer composition comprising:(A) an organosilicon compound formed by binding an organosilicon compound represented by the general formula (I): ##EQU1## wherein R.sup.1 represents a monovalent hydrocarbon group; X represents a hydrogen atom, a lower alkyl group, etc.; and 0.ltoreq.a<0.2, 0.ltoreq.b<0.2 and 1<c<4,with an organopolysiloxane represented by the general formula (II): ##EQU2## wherein R.sup.2 represents a monovalent hydrocarbon group containing no aliphatic unsaturated group; R.sup.3 represents an alkenyl group; Y represents a hydrogen atom, a lower alkyl group, etc.; and 1.8<d<2.2, 0.004<e<0.2 and 0.ltoreq.f<0.2,in a particular proportion;(B) an organic titanate; and(C) an organic solvent.This primer composition achieves adhesion with good durability at high temperatures, particularly in high temperature oils.

Abstract: The foamable silicone rubber composition is capable of giving a cured silicone rubber body having a cellular structure and suitable for use as a very reliable fire-resistant joint-sealing member in buildings. In addition to the rather conventional constituents essential in a foamable silicone rubber composition of prior art including (a) a diorganopolysiloxane, (b) a finely divided reinforcing silica filer, (f) a curing agent and (g) a blowing agent, the foamed silicone rubber body obtained by curing the inventive composition is imparted with very reliable fire resistance by virtue of the synergistic effect of the characteristic ingredients including (c) a ferrite powder, (d) a finely divided inorganic material or, in particular, mica flakes, and (e) a platinum compound, in combination, each in a specified amount.

Abstract: A silicone rubber composition which comprises an organopolysiloxane, a finely divided silica filler, and optionally an organosilicon compound having at least one .tbd.SiH bond in the molecule is described. When an organic peroxide of the following general formula ##STR1## wherein n is an integer of from 2 to 8, and R.sup.2 and R.sup.3 are independently a monovalent hydrocarbon group having from 3 to 10 carbon atoms or a group of the formula, Si(R.sup.4).sub.3, wherein R.sup.4 represents a group selected from a methyl group, an ethyl group and a phenyl group, is added, surface tackiness and physical properties are remarkably improved.

Abstract: An efficient method for the preparation of a foamed and cured silicone rubber body having a uniform fine-cellular structure, in which a foamable silicone rubber composition is prepared by uniformly compounding a diorganopolysiloxane, finely divided silica filler, titanium dioxide powder, blowing agent and curing agent, each in a specified weight proportion, and irradiating the thus prepared composition with microwaves having a frequency of 900 to 5000 MHz which, by virtue of the titanium dioxide powder having a high dielectric constant, are efficiently absorbed and converted to heat, whereby the composition is evenly heated throughout the body to cause uniform foaming and curing.