Fluorine-containing elastomer composition and molded articles ma

Stock material or miscellaneous articles – Composite – Of fluorinated addition polymer from unsaturated monomers

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Details

428422, 524399, 524529, 524530, B32B 2700

Patent

active

053744845

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a novel fluorine-containing elastomer composition and a molded article made therefrom.
More specifically, the present invention relates to a fluorine-containing elastomer composition improved in permanent compression set and adhesion after vulcanization while maintaining excellent tensile characteristics, heat resistance and chemical resistance corresponding to those of conventionally known peroxide-vulcanized fluorine-containing elastomer compositions, a molded article available from the composition, and a laminate comprising a metal, a resin, an elastomer or a fiber and a cured product of said composition which are laminated with an adhesive cured by vulcanization.


BACKGROUND ART

In general, fluorine-containing elastomers are superior in heat resistance and oil resistance and are used in various industrial fields such as general machine industry, industry relating to antipollution technique, automobile industry, shipping industry, aircraft industry and hydraulic machine industry. Especially, since the fluorine-containing elastomers which are subjected to vulcanization with peroxides are markedly excellent in chemical resistance, they are used in the field of sealing lubricating oils containing a large amount of additives and further used where they directly contact with acids or bases.
However, when the fluorine-containing elastomers which are subjected to vulcanization with peroxides are compared with polyol-vulcanizable fluorine-containing elastomers which are subjected to vulcanization with aromatic polyol compounds which are mainly used nowadays, the former are inferior in permanent compression set which is an indication of sealability. Furthermore, they generate halogen compounds originating from the vulcanizing point of the compositions at the time of vulcanization molding which causes deterioration of adhesives. Therefore, no product having strong adhesion can be obtained and defective moldings result. Thus, the peroxide-vulcanizable fluorine-containing elastomers are limited in their use although they have excellent properties.


DISCLOSURE OF INVENTION

The purpose of the present invention is to provide a fluorine-containing elastomer composition improved in permanent compression set and adhesion after vulcanization while maintaining excellent tensile characteristics, heat resistance and chemical resistance corresponding to those of conventionally known peroxide-vulcanizable fluorine-containing elastomer compositions, a molded article available from the composition, and a laminate comprising a metal, a resin, an elastomer or a fiber and a cured product of said composition which are laminated with an adhesive cured by vulcanization.
As a result of intensive research conducted by the inventors, it has been found that the above purpose can be satisified with a composition comprising a specific fluorine-containing elastomer which is peroxide-vulcanizable and further an organic peroxide, a co-vulcanizing agent and a hydrotalcite compound. Thus, the present invention has been accomplished.
That is, the present invention provides a fluorine-containing elastomer composition comprising (A) a peroxide-vulcanizable fluorine-containing elastomer containing iodine and/or bromine which serve as a vulcanizing point, (B) an organic peroxide, (C) a co-vulcanizing agent and (D) a hydrotalcite compound or a calcined product thereof; a molded article obtained from the composition; and a laminate comprising a metal, a resin, an elastomer or a fiber and a cured product of said composition which are laminated with an adhesive cured by vulcanization.


BEST MODE FOR CARRYING OUT THE INVENTION

The present invention is explained in detail below.
The component (A) in the present invention includes fluorine-containing elastomers comprising (a) a vinylidene fluoride unit (hereinafter referred to as "VdF unit") and (b) a hexafluoropropylene unit (hereinafter referred to as "HFP unit") and optionally (c) a tetrafluoroethylene unit (hereinafter referred to as "TFE unit"), f

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