Lens materials and ophthalmic devices including lens materials that are oxygen permeable and resistant to oil absorption are described. In an embodiment, the lens material includes a copolymer composed of repeating units including: a fluorinated acrylate repeating unit; and a silicon-containing repeating unit, wherein a mass:mass ratio of the fluorinated acrylate repeating unit to the silicon-containing repeating unit is greater than or equal to 2:1.

The invention provides a composition capable of providing a molded article that has excellent heat resistance and a small weight change against oxygen plasma exposure and fluorine plasma exposure during a semiconductor manufacturing step. The composition contains a fluorine-containing polymer and a hyperbranched polymer of a cage silsesquioxane with a specific structure.

Provided area perfluoroelastomer composition containing a perfluoroelastomer and a compound having a perylene skeleton, in which the compound having a perylene skeleton is a compound other than perylene and 3,4,9,10-perylenetetracarboxylic acid diimide; and a sealing material containing a crosslinked product of the perfluoroelastomer composition.

A fuel system includes a fuel passage for conveying a hydrocarbon fuel. The hydrocarbon fuel is reactive with oxygen to form carbonaceous deposit. A device is disposed in the fuel passage such as to be exposed to the hydrocarbon fuel. The device includes first and second surfaces that are spaced from each other by a clearance gap into which the hydrocarbon fuel can infiltrate. The first and second surfaces are in sliding motion with respect to each other when the device is in operation. A frangible fluoropolymer coating is disposed on at least one of the first or second surfaces along the clearance gap. The coating is subject to the carbonaceous deposit adhering thereon. The coating is configured to allow portions to release by shearing off with the carbonaceous deposit under stress from the sliding motion to uncover a newly exposed face of the coating.

Comb-block copolymers of isobutylene copolymer backbone with functional comb arms, methods for making a comb-block copolymer comprising polymerizing one or more monomer components comprising units derived from at least one of acrylates, vinyl terminated C.sub.6 to C.sub.20 aromatics, acrylamides, and acrylonitrile using a halogenated copolymer initiator having a benzylic-halide moiety via atom transfer radical polymerization (ATRP) in the presence of a transition metal complex catalyst at a temperature ranging from 30 C. to 150 C., the use of these comb-block copolymers as a tire tread additive, as a nanofiller dispersant in elastomeric nanocomposite compositions comprising halobutyl rubber, as a surfactant, as a sealant, and as an additive in a latex formulation is disclosed.

A sealing member includes: a rubber base material; and a coating provided on the rubber base material and having a melting point of 50 C. or higher, wherein the coating contains a polymer containing an acrylic acid ester containing a perfluoroalkyl group or a methacrylic acid ester containing a perfluoroalkyl group, as a monomer.

Provided is a composition for a gas seal member that can form a gas seal member capable of sufficiently suppressing both the occurrence of overflow fracture and the occurrence of blister fracture. The disclosed composition for a gas seal member is a composition for a gas seal member that contains an elastomer and a fibrous carbon nanostructure. The fibrous carbon nanostructure includes single-walled carbon nanotubes and the fibrous carbon nanostructure is contained in a proportion of at least 0.1 parts by mass and no greater than 12 parts by mass per 100 parts by mass of elastomer.

Disclosed is a gas seal member for high-pressure hydrogen device with sufficiently reduced occurrence of both swelling destruction and blister destruction. The gas seal member is formed of a cross-linked product of an elastomer composition which comprises an elastomer and fibrous carbon nanostructures, wherein a hydrogen diffusion coefficient D1 of a cross-linked product of an elastomer component including the elastomer and a hydrogen diffusion coefficient D2 of the cross-linked product of the elastomer composition satisfy the relationship 0.7<D2/D1<1.0.

A seal comprising a jacket comprising an annular body defining a central axis and a recess extending into the annular body concentric to the central axis, wherein the jacket comprises at least 30 wt % of a PTFE and at least 10 wt % of a filler material, and wherein the filler material comprises a boron-containing material, a nitrogen-containing material, a titanium-containing material, a silicon-containing material, a carbon fiber, a glass fiber, or a combination thereof; and an energizing element disposed in the recess.

The invention provides a novel polymer, a composition, and a molded article. The polymer contains a constitutional unit represented by the following formula (1):

##STR00001##

wherein X.sup.11 and X.sup.12 are the same as or different from each other, and are each a hydrogen atom, an alkyl group optionally containing a fluorine atom, or a phenyl group; Y.sup.11 is an oxygen atom or a sulfur atom; Rf.sup.11 is a hydrogen atom or an alkyl group optionally containing a fluorine atom; and a is an integer of 1 to 4.