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AssigneeShin-Etsu Chemical Co., Ltd.
InventorsYasuhisa Osawa, Shinichi Sato, Masatoshi Arai
Estimating the term…
A crosslinkable fluororubber composition comprising (A) a liquid perfluoro compound having alkenyl groups and a divalent perfluorolakylene or perfluoropolyether structure, (B) a reinforcing filler, (C) a surface treating agent having a fluoroalkyl or fluoropolyalkyl ether group and a silanol group, (D) an addition reactive compound having hydrosilyl groups, and (E) a hydrosilyl or peroxide crosslinker is prepared by mixing components (A) to (C) to form a liquid or paste composition, adding component (D) thereto to form a millable composition, and mixing component (E) therewith. The composition is effectively roll workable and cures into products having excellent physical properties.
A crosslinkable fluororubber composition comprising
Dependencies are inferred from the claim text.
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With organic compounds: containing silicon
Containing halogens: containing fluorine
Use of organic ingredients: silicon-containing compounds
Characterized by the type of post-polymerisation functionalisation: cross-linking
Term end not estimated
This invention relates to crosslinkable fluororubber compositions which can be readily and briefly loaded with fillers, effectively roll milled and produced in a mass scale and cure into products having excellent heat resistance, solvent resistance, chemical resistance, low-temperature properties and mechanical strength.
Prior art vinylidene fluoride base fluororubbers are used in a variety of applications mainly in the automobile and mechanical industries since they are elastomers having good heat resistance and mechanical strength.
These fluororubbers, however, are not satisfactory in chemical resistance. They are readily swollen in polar solvents such as ketone, lower alcohol, carbonyl and organic acid solvents. They are deteriorated by amine-containing chemicals so that their rubber strength and elongation may substantially decline. With respect to low-temperature properties, the fluororubbers lose rubber elasticity at temperatures below −20° C. to such an extent that they cannot be used as sealants. This generally imposes a limit on the use of fluororubbers in cold areas.
Examples of the invention are given below by way of illustration and not by way of limitation. In Examples, all parts are by weight and the viscosity is as measured at 25° C.
The materials used in Examples are as shown below.
Polymer (perfluoro compound):