A method for fluorinating a filter for a pipette tip, the filter being made of a solid porous structure made of polyolefin. The method comprises the following steps: (a) placing the filter in an enclosure, (b) creating a vacuum in the enclosure, and (c) bringing the filter into contact with a fluorination agent injected into the enclosure in a gaseous state, the fluorination agent being made up of difluorine F.sub.2, the difluorine F.sub.2 being injected into the enclosure at a partial pressure between 100 Pa and 10000 Pa and step (c) being done at a temperature between 0 C. and 100 C. A pipette tip comprising a filter modified by the fluorination method, a method for producing such a tip, as well as a withdrawing pipette equipped with such a tip.

As the sealant material composition forming a sealant layer of a pneumatic tire provided with the sealant layer on a tire inner surface, the sealant material composition prepared by blending from 0.1 parts by mass to 20 parts by mass of a crosslinking agent, from 0.1 parts by mass to 40 parts by mass of an organic peroxide, and from 10 parts by mass to 400 parts by mass of a liquid polymer per 100 parts by mass of a butyl rubber is used.

A polyisoolefin-based polymer composition having a multimodal molecular weight distribution is described, which can be prepared by the late addition of a chain transfer agent to the polymerization process. The polymer composition has a low molecular weight fraction having a peak molecular weight (M.sub.p) of less than about 100,000 g/mol and a high molecular weight fraction having a peak molecular weight (M.sub.p) of greater than about 250,000 g/mol, the low molecular weight fraction present in the composition in an amount less than the high molecular weight fraction. Cured articles produced from the polyisoolefin-based polymer composition exhibit improved processability while maintaining physical properties.

An object is to provide a chlorinated polyolefin resin composition being superior in adhesion, solution stability, and chipping resistance. The chlorinated polyolefin resin composition contains a component (A): a polyolefin resin A having a melting point (Tm.sub.A) obtained with a differential scanning calorimeter (DSC) in the range of 90 to 160 C., and a component (B): a polyolefin resin B having a melting point (Tm.sub.B) obtained with a differential scanning calorimeter (DSC) in the range of 50 to 130 C., at least any one of the component (A) and the component (B), or a copolymer thereof being a chlorinated polyolefin resin (where |Tm.sub.ATm.sub.B|5 C.).

An object is to provide a chlorinated polyolefin resin composition being superior in adhesion, solution stability, and chipping resistance. The chlorinated polyolefin resin composition contains a component (A): a polyolefin resin A having a melting point (Tm.sub.A) obtained with a differential scanning calorimeter (DSC) in the range of 90 to 160 C., and a component (B): a polyolefin resin B having a melting point (Tm.sub.B) obtained with a differential scanning calorimeter (DSC) in the range of 50 to 130 C., at least any one of the component (A) and the component (B), or a copolymer thereof being a chlorinated polyolefin resin (where |Tm.sub.ATm.sub.B|5 C.).

An object is to provide a chlorinated polyolefin resin composition being superior in adhesion, solution stability, and chipping resistance. The chlorinated polyolefin resin composition contains a component (A): a polyolefin resin A having a melting point (Tm.sub.A) obtained with a differential scanning calorimeter (DSC) in the range of 90 to 160 C., and a component (B): a polyolefin resin B having a melting point (Tm.sub.B) obtained with a differential scanning calorimeter (DSC) in the range of 50 to 130 C., at least any one of the component (A) and the component (B), or a copolymer thereof being a chlorinated polyolefin resin (where |Tm.sub.ATm.sub.B|5 C.).

The present invention relates to a rubber composition including a rubber component, a reinforcing filler containing a reinforcing filler A and a reinforcing filler B, a layered or platy mineral having an aspect ratio of 3 to 30, and a resin having a glass transition temperature of 41 to 75 C., wherein the reinforcing filler A is carbon black having a nitrogen adsorption specific surface area of less than 50 m.sup.2/g, and the reinforcing filler B is carbon black having a nitrogen adsorption specific surface area of 100 m.sup.2/g or more or silica having a nitrogen adsorption specific surface area of 100 m.sup.2/g or more, the rubber composition being able to produce a vulcanized rubber having excellent gas barrier properties and low-temperature durability.

The present invention relates to a rubber composition including a rubber component, a reinforcing filler containing a reinforcing filler A and a reinforcing filler B, a layered or platy mineral having an aspect ratio of 3 to 30, and a resin having a glass transition temperature of 41 to 75 C., wherein the reinforcing filler A is carbon black having a nitrogen adsorption specific surface area of less than 50 m.sup.2/g, and the reinforcing filler B is carbon black having a nitrogen adsorption specific surface area of 100 m.sup.2/g or more or silica having a nitrogen adsorption specific surface area of 100 m.sup.2/g or more, the rubber composition being able to produce a vulcanized rubber having excellent gas barrier properties and low-temperature durability.

A photoreactive additive manufacturing system comprises a resin tub, a membrane, and a resin pool confined by the resin tub and the membrane. In some embodiments, the membrane comprises a polymeric blend comprising a first polymer and a second polymer, and the first polymer is a fluoropolymer. In some embodiments, the membrane comprises a polymer and an additive to control the free volume of the polymer.

A photoreactive additive manufacturing system comprises a resin tub, a membrane, and a resin pool confined by the resin tub and the membrane. In some embodiments, the membrane comprises a polymeric blend comprising a first polymer and a second polymer, and the first polymer is a fluoropolymer. In some embodiments, the membrane comprises a polymer and an additive to control the free volume of the polymer.