摘要:
A silicone grease composition comprising an organosiloxane containing long-chain alkyl groups, a thickener, and an organomolybdenum compound is disclosed.The silicone grease composition is excellent not only in heat and cold resistance, oxidation resistance, chemical stability and low-load lubricity but also in high-load (extreme-pressure) lubricity.
摘要:
An electroviscous fluid composition comprising a dispersion medium of two nonmiscible components (A) and (B) as below, the volum ratio of (A)/(B) being in the ratio 99/1-1/99, and a dispersoid (C) as below; wherein the true specific gravity of the dispersoid (C) is greater than the specific gravity of said component (A) and less than the specific gravity of said component (B);Component (A):A silicone oil of general formula (I):R.sub.a SiO.sub.(4-a)/2(wherein R, which may be similar or dissimilar, are monovalent hydrocarbon groups with 1-18 carbon atoms and "a" lies in the range 1.8
摘要:
A branched organopolysiloxane is prepared by polymerizing an organopolysiloxane mixture of a branch unit-containing organopolysiloxane and a low molecular weight organopolysiloxane in the presence of an acidic or basic catalyst, or by adding a surfactant to the organopolysiloxane mixture, dispersing it in water to form an emulsion, and polymerizing the emulsion.
摘要:
Disclosed is a novel curable silicone-based aqueous emulsion composition suitable as a surface-coating composition for an air bag base cloth and capable of exhibiting excellent adhesion to the substrate cloth and imparting the surface-coated cloth with excellent flexibility and flame retardancy. The aqueous silicone emulsion composition is a uniform blend which comprises:(A) 100 parts by weight of an aqueous base emulsion of an organopolysiloxane consisting of(A1) from 10 to 70% by weight of an organopolysiloxane having at least two hydroxyl groups bonded to the silicon atoms in a molecule, in which from 0.01 to 10% by moles of the monovalent hydrocarbon groups are alkenyl groups,(A2) from 0.01 to 10% by weight of an anionic surface active agent, and(A3) the balance of water;(B) from 1 to 60 parts by weight of an aqueous dispersion consisting of(B1) from 5 to 50% by weight of a solution containing, in an at least partly water-miscible organic solvent, from 10 to 90% by weight of a reaction product between an amino group-containing hydrolyzable organosilane compound or a partial hydrolysis product thereof and a polycarboxylic acid anhydride, and(B2) from 50 to 95% by weight of an aqueous colloidal silica dispersion containing from 10 to 50% by weight of colloidal silica particles; and(C) from 0.01 to 10 parts by weight of a curing catalyst.
摘要:
The present film-former composition comprises (a) an organosilazane copolymer having a perfluoroalkyl group-containing structural unit and a methacryloyloxy group-containing structural unit, (b) a photosensitizer soluble in an organic solvent, and (c) an organic solvent. The composition is cured by irradiation with ultraviolet light for a short period of time to form a film excellent in water repellency, oil repellency, and hardness.
摘要:
Disclosed is a novel polypropylene resin composition which is outstandingly free from surface tackiness and still has good transparency so as to be useful as a material of resin films used for wrapping. The resin composition comprises, as a uniform blend, (a) 100 parts by weight of a polypropylene resin, and (b) from 0.01 to 10 parts by weight of an inorganic oxide powder which is a product obtained by the deflagration of an inorganic oxidizable powder, e.g., an elementary silicon powder, in an oxidizing atmosphere such as air. By virtue of the unique method for the preparation of the silicon dioxide powder, the particles have high surface activity so that the surface properties of the resin composition or, in particular, resin films prepared therefrom can be greatly improved even with a relatively small amount of the inorganic oxide powder compounded as an anti-blocking agent not to badly affect the transparency.
摘要:
A method of preparing a uniform silicone composition, comprising treating under the application of a shearing force a polymeric product obtained by addition polymerization of (A) an organhydrogenpolysiloxane containing in its molecule from 1.5 to 5 silicon-bonded hydrogen atoms on average, said silicon-bonded hydrogen atoms being in an amount of from 1 to 20 mol %, based on the total of the silicon-bonded hydrogen atoms and silicon-bonded organic groups in the molecule; and (B) an organopolysiloxane containing in its molecule from 1.5 to 5 silicon-bonded aliphatic unsaturated groups on average; in the presence of from 10 to 1,000 parts by weight of low-viscosity silicone oil having a viscosity of not more than 100 cSt at 25.degree. C. based on 100 parts by weight of the total amount of said (A) and (B).
摘要:
Vinyl chloride monomer, or a mixture thereof with a copolymerizable monomer or monomers, is bulkpolymerized so that the deposition of polymer scale on the inner walls of the polymerization vessel and other surfaces in contact with the monomer or monomers can be greatly reduced by coating them with phosphoric esters, polyphosphoric esters or their alkali metal salts before the polymerization is commenced. Clean-up operations following each polymerization run are much simplified.
摘要:
Proposed is a reliable method for the preparation of a water-base hair-care or skin-care toiletry preparation capable of imparting the hair or skin of the user with excellent touch feeling of smoothness and sleekness. The method comprises (a) preparing an aqueous dispersion of globular particles of a cured silicone rubber having a specified average particle diameter by the in situ crosslinking hydrosilation reaction in liquid droplets of a vinyl group-containing dimethylpolysiloxane and an organohydrogenpolysiloxane in combination in the presence of a surface active agent and (b) admixing a base mixture consisting of the principal ingredients of a water-base toiletry composition with a specified amount of the aqueous dispersion of the cured silicone rubber particles.
摘要:
This invention discloses a novel organosilicon compound, which is soluble in silicone oils and strongly absorbs ultraviolet light, represented by the general formula:An organosilicon compound having a benzophenone skeleton represented by the general formula: ##STR1## where "n" is an integer in the range 0.about.100, R.sup.1 are similar or dissimilar saturated hydrocarbon groups with a number of carbon atoms in the range 1-30 or phenyl group, R.sup.2 is a monofunctional organic group represented by the formula --(CR.sup.3 .sub.2 CR.sup.3 (H) CR.sup.3 .sub.2)-- R.sup.4, R.sup.3 is hydrogen atom or a saturated monofunctional hydrocarbon group with 1-5 carbon atoms, and R.sup.4 is a group represented by the formula: ##STR2## wherein R.sup.5 is a hydrogen atom or hydroxyl group, R.sup.6 are hydrogen atoms, or similar or dissimilar monofunctional saturated or unsaturated hydrocarbon groups with 1-10 carbon atoms, "a" is an integer in the range 0-3, and "b" is an integer in the range 0-4.