Static structures (e.g. – buildings)
Reexamination Certificate
2000-02-04
2001-12-04
Szekely, Peter (Department: 1714)
Static structures (e.g., buildings)
C524S432000, C524S433000, C524S436000, C524S437000, C524S450000, C524S456000, C524S544000, C524S545000
Reexamination Certificate
active
06325752
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an aqueous coating composition of a fluororubber. In particular, the present invention relates to an aqueous coating composition comprising a fluororubber and a specific inorganic compound as an acid acceptor.
BACKGROUND ART
When fluororubbers are vulcanized, hydrogen fluoride (HF) is generated by a vulcanizing reaction. Thus, fluororubber coating compositions contain acid acceptors to capture the generated hydrogen fluoride.
In general, oxides or hydroxides of calcium, magnesium, zinc, lead, etc. are used as acid acceptors contained in aqueous coating compositions of fluororubbers (see, for example, JP-A-56-47455 and JP-A-02-248453). However, these inorganic compounds have low dispersion stability in aqueous compositions. Therefore, even when they are dispersed to primary particles, they quickly form secondary agglomerates and form agglomerated materials in the coated films, or such agglomerates deteriorate the storage stability of the aqueous coating compositions of fluororubbers themselves (only main parts containing acid acceptors in the case of two-pack type ones).
DISCLOSURE OF THE INVENTION
One object of the present invention is to provide an acid acceptor which does not form secondary agglomerates once it is dispersed to primary particles and can maintain the storage stability of an aqueous coating composition of a fluororubber, and also to provide an aqueous coating composition comprising a fluororubber and such an acid acceptor.
The above object is accomplished by an aqueous coating composition comprising a fluororubber and at least one inorganic composite compound as an acid acceptor.
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Kinoshita Toshiyuki
Ogita Koichiro
Terasaka Kiyotaro
Tomihashi Nobuyuki
Birch & Stewart Kolasch & Birch, LLP
Daikin Industries Ltd.
Szekely Peter
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