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US 4,066,817 AGranted
Release coating for aluminum and tinplate steel cookware
AssigneeThe Dexter Corporation
InventorFrank De Rossi
Life of this patent
Estimating the term…
Abstract
Aluminum and tinplate steel cookware is coated with a finely divided fluorocarbon polymer dispersed in a silanol-containing organopolysiloxane resin to provide a release coating which may be cured at temperatures which do not interfere with the metallurgical properties of the aluminum or the tinplate steel cookware.
Claims8
A metal cooking utensil having a food contacting surface formed of a cured, adherent film having food release properties, which comprises:
- a metal cooking utensil formed of metal from the group consisting of aluminum and tinplate steel, and having a cured, adherent surface film with food release properties;
- said cured film being formed of a silanol-containing organopolysiloxane resin having fine particles of a fluorocarbon polymer dispersed therein and siloxane fluid;
- said silanol-containing organopolysiloxane resin being the acetone-water hydrolysis product of an organo-halosilane blend consisting essentially of about 60 mole percent of methyltrichlorosilane, about 35 mole percent of phenyltrichlorosilane, and about 5 mole percent of dimethyldichlorosilane, and having an average ratio of about 1.05 organo radicals per silicon atom;
- said fluorocarbon polymer being a member selected from the group consisting of completely fluorinated and fluoro-chlorinated polymers of C.sub.2 -C.sub.4 olefins, having a molecular weight of at least about 250,000, and being in the form of fine particles;
- the percent by weight of organopolysiloxane resin and flurocarbon polymer present in said cured film being about 35 to 60 percent by weight of organopolysiloxane resin and up to about 25 percent by weight of the fluorocarbon polymer.
2 more elements
A metal cooking utensil having a food contacting surface formed of a cured, adherent film having food release properties, which essentially consists of:
- a metal cooking utensil formed of metal from the group consisting of aluminum and tinplate steel, and having a cured, adherent, pigmented surface film with food release properties;
- said cured film being formed of a silanol-containing organopolysiloxane resin having pigment and fine particles of a fluorocarbon polymer dispersed therein and siloxane fluid;
- said silanol-containing organopolysiloxane resin being the hydrolysis product of an organohalosilane blend consisting essentially of about 60 mole percent of methyltrichlorosilane, about 35 mole percent of phenyltrichlorosilane, and about 5 mole percent of dimethyldichlorosilane in the presence of water, acetone and a water-immiscible organic solvent, and having an average ratio of about 1.05 organo radicals per silicon atom;
- said fluorocarbon polymer being a member selected from the group consisting of completely fluorinated and fluorochlorinated polymers of C.sub.2 -C.sub.4 olefins, having a molecular weight in the range of from about 250,000 to about 750,000, and being in the form of fine particles;
- the percent by weight of organopolysiloxane resin, fluorocarbon polymer and pigment present in said cured film being about 35 to 60 percent by weight of organopolysiloxane resin, up to about 25 percent by weight of the fluorocarbon polymer, and about 10 to 40 percent by weight of pigment.
2 more elements
Dependencies are inferred from the claim text.