A release coating composition according to the present invention comprises an alkenyl functional polysiloxane (1), a silicon hydride functional polysiloxane (11) and a catalyst (111) comprising a platinum group metal. The alkenyl functional polysiloxane (1) is an alkenylterminated polysiloxane prepared by siloxane polycondensation and/or equilibration using a phosphazene base catalyst followed by neutralisation with an acidic neutralising agent. The level of catalyst (III) in the composition can be as low as 2-40 parts per million platinum group metal by weight.

Silicone release coating compositions

A constant-velocity universal joint (1, 31, 61) provided with an outside joint member (2, 32, 62), an inside joint member (3, 33, 63) arranged within the outside joint member (2, 32, 62), and a torque-transmitting member (4, 34, 64); a track groove (7, 9, 37, 39, 66) in which a rolling surface of the torque- transmitting member (4, 34, 64) engages being formed on the outside joint member (2, 32, 62) and/or the inside joint member (3, 33, 63), wherein the constant velocity universal joint is characterized in that at least one of the structural members of the constant velocity universal joint (1, 31, 61) comprises a metallic sintered body, the relative density of the metallic sintered body is equal to or greater than 80% and less than 100%, a layer hardened by heat treatment is formed on the surface of the metallic sintered body, and annular structural members comprising a metallic sintered body are subjected to cold-rolling.

Constant velocity universal joint

A room temperature-curing organopolysiloxane composition including (A) 100 parts by weight of at least one of two specific organopolysiloxanes; (B) 0.1 to 30 parts by weight of a silane compound having in its molecule an average of at least two Si-bonded hydrolyzable groups and in which the remaining Si-bonded group(s) is/are a group(s) selected from the group consisting of methyl, ethyl, propyl, vinyl and phenyl groups; a partial hydrolysis-condensation product thereof; or a mixture of these; and (C) 0.1 to 10 parts by weight of a mixture of siloxanes having degrees of polymerization of 2 to 10. The mixture of siloxanes is a partial hydrolysis-condensation product of a silane compound having a group selected from amino, epoxy, mercapto, acryloyl and methacryloyl groups each bonded to the silicon atom through a carbon atom and having a Si-bonded hydrolyzable group. The composition has superior adhesion to various resins.

Room-temperature curing organopolysiloxane composition

A toner including a binder resin and a colorant, the toner having a core-shell structure containing a core and a shell, wherein the binder resin contains a crystalline polyester resin and a non-crystalline polyester resin, wherein a ratio (A/B) of a mass (A) of the crystalline polyester resin to a mass (B) of the non-crystalline polyester resin is 5/95 to 75/25, and wherein a ratio (Ds/Dc) of a hardness (Ds) of the shell to hardness (Dc) of the core is 1.05 to 1.50 where the hardnesses (Ds) and (Dc) are measured with a scanning probe microscope.

Toner, developer, image forming apparatus and image forming method

A fuser member for electrostatographic reproducing apparatus is provided which has a rigid core having coated thereon a thin layer of a composition which comprises the crosslinked product of a mixture of about 100 parts by weight alpha omega-hydroxypolydimethylsiloxane, about 190 to 250 parts by weight total alumina, comprising from about 60 to about 90 percent by weight of finely divided tabular alumina and from about 10 to about 40 percent by weight calcined alumina, together with effective amounts of a crosslinking agent and a crosslinking catalyst.

Fusing member for electrostatographic copiers

A fixing roll for electrophotography having a surface layer of a cured room-temperature-vulcanizing silicone rubber composition comprising a mixture consisting of two diorganopolysiloxanes, one of which is terminated at the chain ends with silanol groups and has a relatively high viscosity, and the other of which is terminated at the chain ends with trialkyl silyl groups and has a relatively low viscosity, an alkoxysilane or a partial hydrolysis-condensate thereof as the crosslinking agent, a metal salt of an organic acid as the reaction catalyst, and three kinds of inorganic fillers, namely, calcium carbonate, iron oxide, and titanium dioxide, and containing substantially no siliceous fillers. The fixing rolls have excellent properties including, in particular, the ability to provide a long copy-life to electrophotographic copying machines.

Fixing roll for electrophotography

To a silicone rubber adhesive composition comprising (A) a diorganopolysiloxane containing at least two alkenyl groups in a molecule, (B) a diorganohydrogenpolysiloxane having at least two hydrogen atoms directly attached to silicon atoms in a molecule and a viscosity of about 5 to about 5,000 cs at 25°C., (C) an adhesion modifier compound containing in its molecule a group represented by (RO) 3 Si-- or H(RO) 2 Si-- wherein R is selected from the group consisting of methyl, ethyl, trifluoroethyl, hexafluoropropyl, and methoxyethyl groups, and (D) a platinum catalyst is added (E) an organic tin compound. The combined use of components (C) and (E) provides he synergistic effect that the resulting adhesive composition can firmly adhere to even polycarbonate and polyphenylene sulfide resins which are known as difficultly bondable resins.

Silicone rubber adhesive compositions

A room temperature-curable organopolysiloxane composition is proposed which is useful as a material for imprinting or blocking of forms of, for example, medical and dental prostheses without the problem of curing retardation or incomplete curing. The composition comprises a vinyl-containing organopolysiloxane, organohydrogenpolysiloxane, platinum catalyst, inorganic filler, liquid paraffin or petrolatum and antioxidant. The antioxidant serves to protect the liquid paraffin or petrolatum from oxidation to produce oxidized compounds which may deactivate the platinum catalyst to cause curing retardation or incomplete curing.

Storage stable and room temperature-curable organopolysiloxane composition

So-called addition-type curable organopolysiloxane compositions curable by the hydrosilation reaction between vinyl groups of a dimethylpolysiloxane and hydrogen atoms directly bonded to the silicon atoms in a methylhydrogenpolysiloxane in the presence of a platinum catalyst can be imparted with a greatly increased pot life to have improved workability when the composition is admixed with a halogen- or alkoxy-substituted olefinic organic compound such as allyl halides, 1,3- and 2,3-dihalogenopropenes, 2-alkyl-3-halogenopropenes, 1,3- and 1,4-dihalogenobutenes-2 and alkyl allyl ethers as a moderator of the crosslinking reaction without any adverse effect on the curability of the composition.

Curable organopolysiloxane composition

The invention provides an improvement of a room temperature-curable silicone rubber composition cured by the mechanism of the condensation reaction between terminal silanolic hydroxy groups of a diorganopolysiloxane and an organosilicon compound having at least three alkoxy groups per molecule in the presence of an organotin compound as a catalyst to form crosslinks in respect of the remarkably small permanent compression set as well as excellent heat resistance of the cured rubbery elastomer thereof Different from conventional compositions of the above mentioned type containing some organotin compound as the curing catalyst, the inventive composition preferably contains very specific organotin compound as the curing catalyst, which is represented by the general formula R2 R1 Sn-O-SnR1 R2 or R2 SnR2 1, in which R is a monovalent hydrocarbon group and R1 is an acid residue of a monoalkyl ester of a dibasic carboxylic acid such as MeOCOCH═CHCOO-- and the like, in a limited amount The composition may further contain an inorganic filler, of which the neutral surface condition is important in order that the composition may have good curability to give a cured rubbery elastomer exhibiting a small permanent compression set A limited content of silicon-bonded vinyl group in the diorganopolysiloxane, the balance being methyl groups, is effective to improve the heat resistance of the cured rubber

Nobuyuki Hasebe

Papers

Fixing roll for electrophotography

Silicone rubber adhesive compositions

Storage stable and room temperature-curable organopolysiloxane composition

Curable organopolysiloxane composition

Room temperature curable silicone rubber composition