Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1980-03-19
1982-02-16
Jacobs, Lewis T.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 3, 260 38, 260 40R, C08K 515
Patent
active
043158455
ABSTRACT:
A process for preparing a chemically platable thermosetting powder coating characterized by preliminarily kneading a composition comprising 3 to 50% by weight of a thermosetting resin, 5 to 60% by weight of an inorganic filler and up to 80% by weight of a rubber component comprising at least 10% by weight of a rubber having ethylenic double bonds and polar groups in the molecule, the amount of which rubber component constitutes the total amount of rubber component in the final powder coating, the rubber component content of the composition to be subjected to the preliminary kneading being at least twice the rubber component content of the final powder coating, said composition being heated at a temperature of at least the melting point of the thermosetting resin at least once during the course of the preliminary kneading, thereby to effect efficient dispersion of the components. The powder coating prepared according to the process of the present invention is substantially homogeneous due to the uniform dispersion of its components, thus providing good applicability thereof on an article, excellent levelling of a coated film of the powder coating when molten in the step of heat hardening and an improved peeling strength between the coated and heat-hardened film of the powder coating and a metal deposited thereon by chemical plating. The chemically platable thermosetting powder coating prepared according to the process of the present invention may further comprise a catalyst for chemical plating, at least 50% by weight of catalyst in the final powder coating being kneaded together with the above-mentioned composition in the step of preliminary kneading.
REFERENCES:
patent: 4131590 (1978-12-01), DeFrank
Fujikura Makoto
Takahashi Hiroshi
Tsuyama Koichi
Uozu Nobuo
Hitachi Chemical Company Ltd.
Jacobs Lewis T.
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