Patent GB-823720-A (GB)
Title: Siloxane coated cooking utensils
IPC: A47J36/02
Filed: 1957-09-18
Abstract: A composition for coating cooking utensils consists essentially by weight of (1) from 70 to 99% of a siloxane resin of the formula <FORM:0823720/IV (a)/1> wherein each R is a saturated aliphatic hydrocarbon radical or an aryl radical and n has an average value from 1 to 1.8 inclusive; (2) from 1 to 30% of a vinyl containing siloxane in which any remaining organic radicals are methyl or phenyl, the amount of vinyl siloxane in (2) being such that there is at least 1% of vinyl siloxane in the total composition; and (3) 0 to 15% of a liquid methylsiloxane incompatible with (1) and being free from alkenyl radicals, the total amount (2) and (3) being not greater than 30% of the total composition.  In a modification a copolymer of (1) and (2) is used.  The composition is conveniently applied to the utensils in the form of a solution, e.g. in toluene, xylene, perchloroethylene, methylene chloride or petroleum ether, and cured by heating in the presence or absence of catalysts, e.g. lead and ferric naphthenates, tin and cobalt octoates, dibutyltin-diacetate, zinc 2-ethylhexoate, tetramethylammonium acetate and benzyltrimethylammonium hydroxide; pigments, fillers and oxidation inhibitors may also be added.  In the example, a copolymer of monophenyl-, monomethyl-, diphenyl- and p  dimethyl-siloxanes (total R/Si=1.4:1) was mixed with various other siloxanes and ferric octoate.  Specifications 637,424, [Group IV], 737,614, 755,198 and U.S.A.  Spicification 2,462,242 are referred to.ALSO:In the baking of foods such as cakes, pies, candy, bread, French pastries, whole wheat bread and cookies, good release of the baked goods from the cooking utensils used is obtained by using utensils which have been coated with a composition consisting essentially by weight of (1) from 70 to 99% of a siloxane resin of the formula RnSiO 4-n/2 , wherein each R is a saturated aliphatic hydrocarbon or aryl radical and n has an average value from 1 to 1.8 inclusive; (2) from 1 to 30% of a vinyl-containing siloxane in which any remaining organic radicals are methyl or phenyl, the amount of vinyl siloxane in (2) being such that there is at least 1% of vinyl siloxane in the total composition; and (3) from 0 to 15% of a liquid methylsiloxane incompatible with (1) and being free from alkenyl radicals, the total amount of (2) and (3) being not greater than 30% of the total composition.  (see Group IV (a)). In a modification a copolymer of (1) and (2) is used.  The composition is conveniently applied to the utensils in solution, e.g. in toluene, xylene, perchloroethylene, methylene chloride or petroleum ether, and cured by heating in the absence or presence of curing catalysts, e.g. lead and ferric naphthenates, tin and cobalt octoates, dibutyltindiacetate, zinc 2-ethylhexoate, tetramethylaminoniumacetate and benzyltrimethylammonium hydroxide; pigments, fillers and oxidation inhibitors may also be added.  In the example the release of various foods baked on metal panels coated with different siloxane compositions is given. Specifications 637,424, 737,614, 755,198, [Group IV (a)] and U.S.A. Specification 2,462,242 are referred to.