Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1997-12-01
2000-07-04
Chen, Vivian
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
428325, 428328, 428329, 428330, 428331, 428421, 428447, 4284735, 428704, 427307, 427375, 4273762, 4274071, 4273855, 427287, B32B 522, B32B 2708, B32B 2720, B32B 2728
Patent
active
060836121
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of forming a heat resistant, mold releasing coating applied to such articles as heat cooking appliances, e.g. hot plates, frying pans, and the top panel of gas cooking tables, as well as to iron bases, scissors, kitchen knives and metal molds for plastic molding.
BACKGROUND ART
It is well known to apply a mold releasing coating to articles for contamination resistance utilizing mold releasing property of fluoro resins. As a coating layer consisting solely of fluoro resins softens when heated, they are used in the form of a mixture with other heat resistant resins such as silicon based resins or polyimide resins, or otherwise they are coated onto an undercoat of such heat resistant resins. However, coating layers obtained from these combination with heat resistant resins fail to possess sufficient hardness and thus are liable to scratches and of poor durability.
The present invention has successfully formed a heat resistant, mold releasing coating with excellent durability, by undercoating the base material with a coating composition which contains, as coating layer forming components, a mixture of frit and heat resistant resin, and then applying thereon a fluoro resin coating.
DISCLOSURE OF INVENTION
The present invention relates to a heat resistant, mold releasing coating formed on the surface of an article which requires a mold releasing coating. The present coating is a heat resistant, mold releasing coating characterized in: material to be coated, wherein the coating layer forming components thereof comprises 20 to 95% by weight of frit and 5 to 80% by weight of at least one heat resistant resin selected from the group consisting of fluoro resins, silicon based resins, aromatic polysulfone resins, poly(phenylenesulfide) resins, polyamideimide resins and polyimide resins, and A, wherein the coating layer forming components thereof comprises 20 to 100% by weight of one or more fluoro resins, 0 to 20% by weight of frit, and 0 to 80% by weight of at least one heat resistant resin selected from the group consisting of silicon based resins, aromatic polysulfone resins, poly(phenylenesulfide) resins, polyamideimide resins and polyimide resins.
Thus, by employing the mixture (layer A) of frit and one or more heat resistant resins as an undercoat layer for fluoro resin coating, a mold releasing coating is obtained that provides excellent heat resistance, sufficient hardness and durability as well as provides excellent adhesion to the surface of the base material.
Also, a coating may be provided that includes a primer layer C between the surface of the base material and the layer A which primer layer C contains at least one component selected from the group consisting of heat resistant resins such as fluoro resins, silicon based resins, aromatic polysulfone resins, poly(phenylenesul fide) resins, polyamideimide resins and polyimide resins, and/or includes a primer layer D between the layers A and B containing at least one component selected from the above-identified group.
Provision of such a primer layer or layers can improve the adhesion between the opposite layers which hold the corresponding primer layer in between, i.e. the surface of the base material and the layer A as for primer layer C, for example.
In addition, the present invention relates to a method of forming a heat resistant, mold releasing coating on the surface of an article which requires a mold releasing coating. The present method is a method of forming a heat resistant, mold releasing coating characterized by the steps of: composition A, wherein 20 to 95% by weight of the coating layer forming components thereof is comprised of frit and wherein 5 to 80% by weight of said coating layer forming components is comprised of at least one heat resistant resin selected from the group consisting of fluoro resins, silicon based resins, aromatic polysulfone resins, poly(phenylenesulfide) resins, polyamideimide resins and polyimide resins; forming components thereof comprises 20 to 100% by
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patent: 5688851 (1997-11-01), Kress
Chen Vivian
Okitsumo Incorporated
LandOfFree
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