摘要:
The water permeability of cured thermosetting organic resin compositions is reduced and the dimensional stability of these compositions during molding is improved by the addition to the curable resin composition of a finely divided, cured organosiloxane material prepared from a curable organopolysiloxane, a curing agent for the organopolysiloxane, an optional silica filler and an aromatic hydrocarbon compound containing a substituted benzene ring where the substituent is a monovalent ethylenically unsaturated hydrocarbon radical or an alkenyloxy radical.
摘要:
The silicone rubber adhesive of the present invention is composed of a particular organopolysiloxane, condensation reaction catalyst and organoperoxide in restricted blending ratios. As a result, a characteristic of the present invention is that various organic materials may be tightly and durably bonded to silicone rubbers by applying the adhesive of the present invention to the surface of a cured silicone rubber and laying on and then curing an organic material such as a synthetic rubber composition, for example, ethylene-propylene terpolymer rubber or chloroprene rubber, or a phenol resin, epoxy resin, etc. In addition, it is also a characteristic of the present invention that silicone rubber may be tightly bonded to various materials by applying the silicone rubber adhesive of the present invention to various organic materials as mentioned above, bringing a silicone rubber composition which contains a curing catalyst into contact and then curing.
摘要:
Optical communications fibers made by coating with an addition curable composition made from an alkenyl containing organopolysiloxane, a methylhydrogenpolysiloxane, a platinum-type catalyst, and an alkynyl compound provide reduced hydrogen gas generation on quartz fiber and has less transmission loss when the platinum-type catalyst is present in amounts greater than 20 ppm platinum-type metal, the SiH to aliphatically unsaturated is from 0.75/1.00 to 1.05/1.00, and the weight ratio of total alkynyl groups to platinum-type metal is 1.0/1.0 to 15.0/1.00.
摘要:
A noncuring transparent organopolysiloxane composition obtained from a mixture of phenyl containing organopolysiloxane with at least 50% methyl radicals and 5 to 20% phenyl radicals and a finely divided silica treated with a phenyl containing silane or polysiloxane and a hydroxyl or hydrolyzable group is used in optical communications components, such as filler or a coupling agent.
摘要:
An aqueous emulsion comprising an aminoorgano-substituted organopolysiloxane fluid, a silane which bears a hydrophilic group, one or more surfactants and water are useful for treating fibers, such as thread, yard and textiles. When applied to a fiber and heated the composition undergoes a curing reaction and durably imparts desirable properties, such as excellent hand and moisture absorbability, to the fiber.
摘要:
What is disclosed is a method of producing molded polyurethane articles by a reaction injection molding process which includes mixing one or more polyols, polyisocyanates and catalysts with an organopolysiloxane containing at least one --COOA group, wherein A is an alkali metal, and molding the curing the mixture.An example of the organopolysiloxane is ##STR1##
摘要:
Organopolysiloxane compositions which react by way of a hydrosilylation reaction to undergo an increase in viscosity have improved resistance to reaction at room temperature (longer pot life) and/or an improved reaction rate at elevated temperature (shorter cure time) than analogous compositions of the art by incorporating therein an unsaturated hydrocarbon having from 6 to 10 carbon atoms, a terminal acetylenic linkage and an olefinic linkage conjugated therewith. The resulting compositions are useful for preparing various cured siloxanes such as resins, elastomers, gels and foams.
摘要:
A room temperature vulcanizable silicone rubber composition is prepared by mixing hydroxyl or alkoxyl endblocked polydiorganosiloxane, crosslinking agent containing at least two water-hydrolyzable radicals, namely alkoxy, ketoximo, alkenyloxy, aminoxy, amino, and amido, and a spindle-shaped calcium carbonate. Curing the composition results in a silicone rubber with improved thermal stability.
摘要:
Fiber-treating compositions are described which durably provide water repellency and oil repellency for the treated fiber. These compositions comprise a siloxane component bearing fluorinated hydrocarbon radicals, unsubstituted hydrocarbon radicals and silicon-hydride atoms, and a dehydrogenation condensation catalyst. Curing of the compositions occurs by a dehydrogenation condensation reaction between the silicon-hydride atoms and/or between the silicon-hydride atoms and the hydroxyl radical of an optionally added hydroxyl-endblocked organopolysiloxanes.
摘要:
A curable liquid composition containing a liquid polyorganosiloxane and carbon black whose specific surface area is at least 900 m.sup.2 /g and which are hollow-shell-shaped particles cures to a product having excellent electrical conductivity.