To provide an elastic roll for an electro-photographic apparatus that includes an elastic body layer having a low hardness and being excellent in fatigue resistance, and thus is resistant to fatigue, and to provide a method for manufacturing the same.

An elastic roll 10 for an electrophotographic apparatus includes a shaft body 12, and a foamed elastic body layer 14 provided on an outer periphery of the shaft body 12, wherein the foamed elastic body layer 14 consists of a silicone rubber foamed body including a plurality of air bubbles 18 in its base material containing cross-linked silicone rubber and a reinforcement material, and wherein the foamed elastic body layer has a communication degree of 40% or more. It is preferable that the elastic roll 10 should further include a skin layer 14a in the foamed elastic body layer 14 on an outer peripheral side.

Provided are rapidly cross-linkable silicone foam compositions, kits, and methods for filling implanted medical devices in situ or in vivo, the implanted medical devices, including for example, body implants and tissue expanders, the compositions including a platinum divinyl disiloxane complex; a low viscosity vinyl terminated polydimethylsiloxane; a low viscosity hydride terminated polydimethylsiloxane; a silicone cross-linker; and a gas and/or gas-filled microcapsules, where the rapidly cross-linkable silicone foam composition has a viscosity of 150 cPs for 1 min. post-preparation and 300 cPs5 min. post-preparation, at ambient temperature.

The present disclosure relates to a hydrophobically modified nanocellulose crystal and a method for hydrophobic grafting modification of nanocellulose crystals, comprising the steps: mixing the nanocellulose crystals with a saturated alkane, and stirring the resultant at room temperature or under a heating condition; while stirring, adding in sequence a polymethylhydrosiloxane containing a silicon-hydrogen bond and a catalyst; continuously stirring to complete the dehydrogenation reaction, then obtaining a mixed solution; and filtering the mixed solution by a polyvinylidene fluoride membrane, then drying it to complete the hydrophobic modification. A SiOC-chemical bonding is formed between the polymethylhydrosiloxane and the nanocellulose crystal in the method, enabling improvement of the hydrophobicity and water resistance of the nanocellulose crystal.

A curable hot-melt silicone composition that is less susceptible to curing inhibition and with excellent storage stability, and a sheet or film containing the same, is provided. The composition comprises: (A) a solid organopolysiloxane resin containing a specific ratio of (A1) an organopolysiloxane resin having a curing reactive functional group that contains a carbon-carbon double bond and containing 20 mol % or more of a Q unit, and (A2) an organopolysiloxane resin not having a curing reactive functional group that contains a carbon-carbon double bond and containing 20 mol % or more of a Q unit; (B) a chain organopolysiloxane having a curing reactive functional group that contains at least two carbon-carbon double bonds; (C) an organohydrogenpolysiloxane resin having a mass loss ratio relative to pre-exposure of 10% or less after exposure to 100 C. for 1 hour under atmospheric pressure; and (D) a hydrosilylation reaction catalyst. The composition generally has hot-melt properties.

A sponge-formable silicone rubber composition of the present invention comprises (A) a polyorganosiloxane having at least two silicon-bonded alkenyl groups per molecule, (B) a polyorganosiloxane having at least two silicon-bonded hydrogen atoms per molecule, (C) water, (D) a thickening agent, (E) an emulsifier, (F) a halogen-containing ion conductor of an alkali metal, and (G) a hydrosilylation reaction catalyst. The sponge-formable silicone rubber composition can form a silicone rubber sponge having uniform and fine bubbles and having small distortion due to contraction after secondary vulcanization.

A sponge-formable silicone rubber composition comprises: (A) a polyorganosiloxane having at least two silicon-bonded alkenyl groups per molecule, (B) a polyorganosiloxane having at least two silicon-bonded hydrogen atoms per molecule, (C) water, (D) cellulose nanofibers, (E) an emulsifier, and (F) a hydrosilylation reaction catalyst. The sponge-formable silicone rubber composition can form a silicone rubber sponge having uniform and fine bubbles and that does not readily contaminate a mold.

The invention relates to a crosslinkable composition X, comprising: at least one organopolysiloxane compound A comprising, per molecule, at least two C2-C6 alkenyl radicals bonded to silicon atoms; at least one organohydrogenopolysiloxane compound B comprising, per molecule, at least two hydrogen atoms bonded to an identical or different silicon atom; at least one catalyst C which is a complex corresponding to the following formula: [Co(L1)2] in which: the symbol Co represents cobalt at degree of oxidation II; the symbols L1, which may be identical or different, represent a ligand which is a -dicarbonylato anion or the enolate anion of a -dicarbonylated compound; optionally at least one adhesion promoter D; and optionally at least one charge E. The invention also relates to the use of the previously described catalyst C as silicone composition crosslinking catalyst, to a silicone composition crosslinking method, characterized in that it consists in heating the composition X to a temperature of between 70 and 200 C., and to the resulting crosslinked silicone material Y.

An object is to provide a heat conductive sheet having good handleability when mounting between the heating element and the heat dissipator, and softness that enables the distortion of the heating element, the heat dissipator, and the like to be suppressed in use. The heat conductive sheet contains: a matrix comprising a cured product of organopolysiloxane; and heat conductive fillers comprising anisotropic fillers with their major axes oriented in the thickness direction, and has a load property P represented b formula (1) below of 0.1 to 0.7:
Load property P=(F.sub.30F.sub.20)/F.sub.10(1) wherein F.sub.10 is a load of the heat conductive sheet at 10% compression, F.sub.20 is a load of the heat conductive sheet at 20% compression, and F.sub.30 is a load of the heat conductive sheet at 30% compression.

Pressure sensing layers, devices comprising same, pressure sensing monitors and composite materials comprising a) a porous matrix material comprising a siloxane polymer, comprising a closed porosity volume fraction, and, optionally, an open porosity volume fraction, and b) a conductive or semiconductive filler substantially present in the closed porosity volume fraction of the porous matrix material a), and films, coated substrates and multilayer structures comprising the composite material and the use thereof in pressure sensing devices.

The present invention relates to a new silicone foam obtained from a blowable crosslinkable silicone composition comprising an organopolysiloxane having at least two alkenyl groups bonded to silicon per molecule, an organosilicon compound having at least two and preferably at least three hydrogen atoms bonded to silicon per molecule, a hydrosilylation catalyst, at least one porogenic agent which is water, a hydrogel, or an aqueous silicone emulsion, at least one chemical blowing agent, and a linear polydimethylsiloxane.