摘要:
The present invention provides a coating agent for an electrophotographic carrier comprising as a major component a copolymer of at least one monomer selected from the organopolysiloxanes represented by the following general formulas 1, 2, and 3 with other polymerizable monomer: ##STR1## wherein the general formulas 1, 2, and 3, R.sup.1 is hydrogen atom or methyl group; R.sup.2 is C.sub.1 -C.sub.10 alkyl or phenyl group; R.sup.3 is R.sup.2 or CH.sub.2 .dbd.C(R.sup.1)COOC.sub.3 H.sub.6 ; n, p, and q are defined as n.gtoreq.3, p.gtoreq.0, q.gtoreq.3, and p
摘要:
Novel organopolysiloxanes containing both a (meth)acryl group and a carboxyl group in a molecule are well compatible with organic resins and useful as resin modifiers.
摘要:
Hydrogenpolysiloxanes having a (meth)acryloxypropyl group on a side chain are useful intermediates. They are prepared by equilibration reaction of siloxane compounds.
摘要:
A curable resin composition comprises (A) a silicone resin having epoxy and phenyl groups and at least two hydrolyzable silyl groups and/or silanol groups in one molecule, (B) a vinyl polymer having a group or groups reactive with the epoxy group in the ingredient (A), and (C) a condensation catalyst for the silicone resin.
摘要:
A hard coating composition comprising an epoxy group-containing organic silicon compound and inorganic submicron particles such as silica sol is curable with a minimal amount of an antimony compound as the curing catalyst. The composition is thus stable during shelf storage and can be cured to a plastic optical article as a mar resistant hard coating film.
摘要:
A method for removing an acidic gas from a raw gas containing the acid gas by contacting the raw gas with an aqueous alkanol amine solution, characterized in that a composition comprising an organopolysiloxane containing a polyoxyalkylene group and a fine silica powder is caused to be present. In some embodiments, a composition comprising the above-mentioned organopolysiloxane and a fine silica powder is added appropriately according to the state of foaming in an acidic gas removing reaction system from the outside of the system, or use is made of an alkanol amine containing in advance a composition comprising the above-mentioned organopolysiloxane and a fine silica powder. In preferred embodiments, the fine silica powder has a specific surface area of 50 m2/g or more, and/or the composition comprising the above-mentioned organopolysiloxane and a fine silica powder is used in an amount of 0.1 to 5000 ppm relative to the alkanol amine. As a further embodiment, a method for removing an acidic gas from a raw gas by contacting the raw gas with an aqueous alkanol amine solution containing 40 mass % or more of an alkanol amine, characterized in that a composition comprising the above-mentioned organopolysiloxane and a fine silica powder is caused to be present in an amount of 0.1 to 5000 ppm relative to the alkanol amine.
摘要:
A wet frictional material having a high heat resistance, excellent durability and superior initial conformability. The wet frictional material contains a fiber base material, a filler, a frictional adjustment agent and a thermosetting synthetic resin. The thermosetting synthetic resin comprises a silicone resin represented by the following average formula. The silicone resin contains a trifunctional unit (RSiO.sub.3/2) (where R represents a substituted or unsubstituted monovalent hydrocarbon group) in an amount of from 40 to 100 mol % of units constituting the silicone resin:(R.sup.1).sub.a (OR.sup.2).sub.b SiO.sub.(4-a-b)/2where R.sup.1 represents a substituted or unsubstituted monovalent hydrocarbon group, and R.sup.2 represents a hydrogen atom or an organic group having from 1 to 10 carbon atoms, and 0.2.ltoreq.a.ltoreq.1.8 and 0
摘要:
Novel organopolysiloxanes have the average compositional formula (1): ##STR1## wherein X is a monovalent substituent containing a polyoxyethylene group, Y is a 3-(meth)acryloxypropyl group, R.sup.1 is a C.sub.1-6 alkyl group or phenyl group, a=0 or 1, 1.ltoreq.b.ltoreq.20, 0.ltoreq.c.ltoreq.10, 1.ltoreq.d.ltoreq.10, and 1.ltoreq.a+c.ltoreq.10. They are prepared by effecting addition reaction of an aliphatic unsaturated compound containing a polyoxyethylene group to corresponding organohydrogenpolysiloxanes.
摘要:
Silicone block polymers are obtained by cohydrolysis of a both end reactive diorganopolysiloxane and a silane or a partial hydrolyzate thereof or curing a both end reactive diorganopolysiloxane and an organopolysiloxane at room temperature or elevated temperatures. They have improved flexibility, stain resistance, thermal shock resistance, and water repellency and are suitable to form hard coatings, moistureproof coatings and topcoats.
摘要:
The room temperature-curable coating composition comprises, as the resinous vehicle thereof, a copolymer prepared by the radical copolymerization of a ternary monomeric mixture composed of (A) 20-80% by weight of an alkyl (meth)acrylate, e.g., methyl methacrylate, (B) 10-78% by weight of an oligomeric organopolysiloxyanylalkyl (meth)acrylate, e.g., 1,1,1,3,5,5,5-heptamethyl-3-(3-methacryloxypropyl) trisiloxane, and (C) 2-30% by weight of an organosilane compound having at least one hydroxyzable group and a radical-polymerizable unsaturated group, e.g., 3-methacryloxypropyl trimethoxy silane. The coating composition gives a cured coating film having outstandingly high weatherability and resistance against ultraviolet light, water and chemicals in comparison with conventional room temperature-curable acrylic resin-based coating compositions.