摘要:
The fluorine-containing organosilicon compound of the present invention is represented by the following formula: ##STR1## wherein Rf is a perfluoroalkyl group. This compound is quite useful as a raw material for the production of polysilethylenesiloxanes excellent in solvent resistance.
摘要:
The present room temperature curing composition comprises an organopolysilethylenesiloxane represented by the following general formula: ##STR1## wherein R.sup.1 to R.sup.4 each represent an alkyl having up to 8 carbon atoms or a phenyl group and n is an integer of 10 or above, and an organosilane or an organosiloxane having two or more hydrolyzable groups such as alkoxy groups in the molecule. The composition can form a cured product high in rubber strength and excellent in chemical resistance.
摘要:
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.
摘要:
A room temperature curable organopolysiloxane composition comprising: (A) 100 parts by weight of a diorganopolysiloxane blocked by hydroxyl group at both terminal ends of its molecule, (B) from 0.5 to 30 parts by weight of an organosilicon compound having at least three silicon-bonded hydrolyzable groups in its molecule or a partially hydrolyzed product of the organosilicon compound, (C) from 0.1 to 15 parts by weight of an alkoxysilane having the following general formula (1): ##STR1## wherein R.sup.1 and R.sup.2 are each an unsubstituted or substituted monovalent hydrocarbon group of from 1 to 8 carbon atoms, R.sup.3 is a divalent hydrocarbon group of from 1 to 8 carbon atoms which may contain an amide linkage (--CONH--) or ether oxygen linkage, Rf is a divalent perfluoroalkylene group or a divalent perfluoropolyether group, and n is an integer from 1 to 3, and a cured product of the composition. The composition and the cured product thereof ensure lessened contamination on surfaces of the cured product and in the surroundings, and permit easy removal of fungi, if any, from surfaces of the cured product.
摘要:
Silicone rubber compositions, of the addition curable type, comprise as a base polymer a vinyl-containing organopolysiloxane having a tetraorganosilethylenesiloxane unit of the following general formula: ##STR1## wherein R.sup.1 to R.sup.4 are each a monovalent hydrocarbon group of from 1 to 10 carbon atoms. The silicone rubber composition gives a cured product having high strength, for example, a tensile strength of 30 kg/cm.sup.2 or above, without compounding fillers or reinforcing agents.
摘要:
A room temperature curable silicone composition comprising(A) an organopolysilethylenesiloxane represented by the following general formula (1): ##STR1## wherein R.sup.1 to R.sup.4 each represent a monovalent hydrocarbon group having 1 to 10 carbon atoms, and n is an integer of 10 or over,(B) an organosilane or an organosiloxane having at least two hydrolyzable groups in the molecule, and(C) at least one ultraviolet absorbing agent and antioxidant. The cured product formed from this composition exhibits good soil resistance for a long period of time and soiling of the surface of the cured product and its surroundings due to dust or the like in the air can be obviated effectively.
摘要:
Fluorine-containing dimethylchlorosilanes are prepared by reacting an ethylene compound having a fluorine-containing organic group with dimethylchlorosilane in the presence of a rhodium complex, for instance RhCl(PPh.sub.3) (Ph: phenyl group), as a catalyst. The use of a rhodium complex as a catalyst enables preparation in high yield of the fluorine-containing dimethylchlorosilane, which has been heretofore obtainable only in low yields.
摘要:
A room temperature curable composition comprising:(A) a fluorine-containing organosilicon compound having the formula (1):R.sup.2 --NHCO--[Rf.sup.1 --CONH--R.sup.1 --Q--R.sup.1 --NHCO].sub.a --Rf.sup.1 --CONH--R.sup.2 (1) wherein a is an integer of 0 or more, Rf.sup.1 is a perfluoroalkylene group or perfluoropolyether group, R.sup.1 is a divalent hydrocarbon group, R.sup.2 is a monovalent aliphatic unsaturated hydrocarbon group, and Q is a particular organosilicon group,(B) an organohydrogenpolysiloxane containing at least two Si--H groups in its molecule, and(C) a platinum family metal compound, the component (B) being contained such that the Si--H groups are contained in an amount of 0.5 to 5.0 moles per mole of the aliphatic unsaturated hydrocarbon group contained in the composition. The composition produces a cured product having good solvent resistance, chemical resistance, heat resistance and cold resistance.
摘要:
An omnidirectional camera comprises a camera mounting frame 5 of a cylindrical hollow body, two or more first mount blocks 8 which hold a first lens unit 9 in a horizontal posture and are installed to the camera mounting frame from a horizontal direction, and first circuit boards provided on inner end surfaces of the first mount blocks, and in the omnidirectional camera, the camera mounting frame and the first mount blocks are made of materials with good heat transfer properties, the first circuit board has a ground layer formed on an abutting surface with respect to the first mount block and a first image pickup element arranged on an optical axis of the first lens unit, and the heat generated from the first image pickup element is radiated from the first mount block and the camera mounting frame through the ground layer.
摘要:
A compound having inhibitory activity on the binding of a substance α to a PTGS suppressor protein, wherein the substance α has a property of inducing PTGS and a property of binding to the PTGS suppressor protein and shows a decrease in the property of inducing PTGS upon binding to the PTGS suppressor protein.