Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1981-09-01
1983-10-11
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
523101, 524536, 428422, C08K 308, C08L 2718, B32B 2720, C09D 378
Patent
active
044093543
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
Field of Invention
The present invention relates to a fluorinated resin containing coating composition. As the coating composition, there are included primers, compositions for intermediary coating and compositions for top coating.
Background Technique
Fluorinated resins are utilized for coating of cooking utensils because of their peculiar non-adhesiveness. Since fluorinated resins are relatively soft synthetic resins, they are poor in resistance to scratching, for instance, by metal spatulas used in cooking. This disadvantage becomes marked at a high temperature of about 200.degree. C.
Therefore, various methods have been developed for improving the scratch-resistance of fluorinated resin coating films. For example, Japanese Patent Publication No. 10386/1977 discloses a fluorinated resin coating film comprising a under-coat and a top coat made of a transparent fluorinated resin dispersion, characterized in that the under-coat consists of a fluorinated resin, mica particles and mica particles or metal flakes covered with a pigment. According to the investigation made by the present inventors, however, this coating film does not possess a practically satisfying wear-resistance.
For affording a wear-resistance to fluorinated resin coating films, a method has been put to practical use which comprises spraying a metal substrate, prior to application of a fluorinated resin, with a ceramic or a hard metal in a melted state so as to form an uneven layer on the substrate surface and then applying the fluorinated resin thereon. According to this method, adhesion of the coating film to the substrate is assured by an anchor effect, and the specific properties of the resin such as non-adhesiveness can be maintained even when a part of the surface portion of the coating film is taken off by scratching because the resin particles contained in the concave portions in the uneven layer on the substrate surface are not removed. Some concrete processes for effecting this method and materials to be used for melt-spraying have been proposed, but their practical use in usual cooking utensils is difficult because the metal materials employed are expensive, and in the case of ceramics, a plasma melt-spraying process requiring large equipment and power (energy cost) is necessary.
DISCLOSURE OF INVENTION
The present invention relates to a fluorinated resin coating composition which comprises (a) a fluorinated resin, (b) micaceous iron oxide and (c) a liquid carrier. When the composition containing the components (a), (b) and (c) does not contain an auxillary agent for adhesion, the composition of the invention is used for top coating or intermediary coating with a fluorinated resin. When any auxiliary agent is contained, it is mainly employed as a primer on a fluorinated resin coating but it is also utilizable as a composition for top coating or intermediary coating according to the desired purpose. The composition of the invention can overcome the above mentioned disadvantages as seen in the prior art and afford a fluorinated resin coating film being excellent in wear-resistance without any special process for application.
PREFERRED EMBODIMENT OF THE INVENTION
The micaceous iron oxide to be used in the composition of the invention (hereinafter referred to as "MIO" (Micaceous Iron Oxide)) is present as fine scale-like crystals mainly comprising ferric oxide (.alpha.-Fe.sub.2 O.sub.3). It has been used as a rust-preventing pigment and is commercially available (Color Material, Vol. 52, p. 258 (1979)). Since it is not poisonous and causes no environmental pollution, it can be used without trouble as a component of a coating composition for cooking utensils.
The flake size of the MIO crystals to be used in the composition of the invention is 5-100.mu., preferably 10-60.mu..
The mixing proportion of MIO to the fluorinated resin is 5-100% by weight, preferably 20-70% by weight. When the mixing proportion of MIO is smaller than 5% by weight, the wear-resistance of the coating film is not obtained. When it is lar
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Kataoka Yoshiaki
Mizuno Toshio
Namba Mutsusuke
Suzue Seisuke
Daikin Kogyo Co. Ltd.
Lilling Herbert J.
Marquis Melvyn I.
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