Patent GB-1092325-A (GB)
Title: Process for rendering a vitreous surface of an oven more amenable to cleansing
Inventor: ESELGROTH THEODORE WILLIAM
IPC: F24C15/00
Filed: 1964-10-13
Abstract: To facilitate the cleaning of deposited baking by-products from a vitreous surface of an oven, such as the inner porcelain or porcelain-enamel surface of the baking chamber of an oven, a thin film of a dimethylpolysiloxane oil, having, e.g. a viscosity, at 25 DEG  C., between 100 and 100,000 centistokes, is applied to the surface before it is exposed to said by-products.  The preferred oil is trimethylsiloxy end-blocked dimethyl-polysiloxane having a viscosity, at 25 DEG  C., 10,000 and 60,000 centistokes.  Preferably, a solution of the oil, in a hydrocarbon fully substituted by chlorine and fluorine and having a low molecular weight, is sprayed on to the surface and the solvent is then allowed to evaporate. The solvent may be a mixture of a chlorofluoro-hydrocarbon having a boiling point, at normal atmospheric pressure, significantly below room temperature, e.g. dichlorodifluoromethane (b.p. -21.6 DEG  F.) and a chlorofluorohydrocarbon boilling substantially at room temperature at normal atmospheric pressure, e.g. trichloromono-fluoromethane (b.p. 74.8 DEG  F.). Trichloro-trifluoroethane and tetrafluorodichloroethane are also specified as solvents.  The solution may contain between 0.5 and 7.0% of the oil, by weight. Such low-boiling solutions are conveniently stored, under pressure, in valved containers.ALSO:To facilitate the cleaning of deposited baking by-products from a vitreous surface of an oven, such as the inner porcelain or porcelain-enamel surface of the baking chamber of an oven, a thin film of a dimethylpolysiloxane oil, having e.g. a viscosity, at 25 DEG  C., between 100 and 100,000 centistokes, is applied to the surface before it is exposed to said by-products.  The film is preferably between 5 microns and 2 mils in thickness. The preferred oil is trimethylsiloxy end-blocked dimethylpolysiloxane having a viscosity, at 25 DEG  C., between 10,000 and 60,000 centistokes. Preferably, a solution of the oil, in a hydrocarbon fully substituted by chlorine and fluorine and having a low molecular weight, is sprayed on to the surface and the solvent is then allowed to evaporate.  The solvent may be a mixture of a chlorofluorohydrocarbon having a boiling point, at normal atmospheric pressure, significantly below room temperature, e.g. dichlorodifluoromethane (b.p. - 21.6 DEG  F.) and a chlorofluorohydrocarbon boiling substantially at room temperature at normal atmospheric pressure, e.g. trichloromonofluoromethane (b.p. 74.8 DEG  F.). Trichlorotrifluoroethane and tetrafluorodichloroethane are also specified as solvents.  The solution may contain between 0.5 and 7.0% of the oil, by weight. Such low-boiling solutions are conveniently stored, under pressure, in valved containers.  The oil itself may be applied to the surface by a wiper or brush. Alternatively, an aqueous emulsion of the oil may be wiped or sprayed on to the surface.ALSO:To facilitate the cleaning of deposited baking by-products from a viterous surface of an oven, such as the inner porcelain or porcelain-enamel surface of the baking chamber of an oven, a thin film of a dimethylpolysiloxane oil, having e.g. a viscosity, at 25 DEG C., between 100 and 100,000 centistokes, is applied to the surface before it is exposed to said byproducts.  The film is preferably between 5 microns and 2 mils in thickness.  The preferred oil is trimethylsiloxy end-blocked dimethylpolysiloxane having a viscosity, at 25 DEG C., between 10,000 and 60,000 centistokes.  Preferably, a solution of the oil, in a hydrocarbon fully substituted by chlorine and fluorine and having a low molecular weight, is sprayed on to the surface and the solvent is then allowed to evaporate.  The solvent may be a mixture of a chlorofluorohydrocarbon having a boiling point, at normal atmospheric pressure, significantly below room temperature, e.g. dichlorodifluoromethane (b.p. -21.6 DEG F.) and a chlorofluorohydrocarbon boiling substantially at room temperature at normal atmospheric pressure, e.g. trichloromonofluoromethane (b.p. 74.8 DEG F.).  Trichlorotrifluoroethane and tetrafluorodichloroethane are also specified as solvents.  The solution may contain between 0.5 and 7.0% of the oil, by weight. Such low-boiling solutions are conveniently stored, under pressure, in valved containers.  The oil itself may be applied to the surface by a wiper or brush. Alternatively, an equeous emulsion of the oil may be wiped or sprayed on to the surface.ALSO:To facilitate the cleaning of deposited baking by-products from a vitreous surface of an oven, such as the inner porcelain or porcelain-enamel surface of the baking chamber of an oven, a thin film of a dimethylpolysiloxane oil, having e.g. a viscosity, at 25 DEG C., between 100 and 100,000 centistokes, is applied to the surface before it is exposed to said by-products.  The film is preferably between 5 microns and 2 mils in thickness.  The preferred oil is trimethylsiloxy end-blocked dimethylpolysiloxane having a viscosity, at 25 DEG C, between 10,000 and 60,000 centistokes.  Preferably, a solution of the oil, in a hydrocarbon fully substituted by chlorine and fluorine and having a low molecular weight, is sprayed on to the surface and the solvent is then allowed to evaporate.  The solvent may be a mixture of a chlorofluorohydrocarbon having a boiling point, at normal atmospheric pressure, significantly below room temperature, e.g. dichlorodifluoromethane (b.p. - 21.6 DEG F.) and a chlorofluorohydrocarbon boiling substantially at room temperature at normal atmospheric pressure, e.g. trichloromonofluoromethane (b.p. 74.8 DEG F.).  Trichlorotrifluoroethane and tetrafluorodichloroethane are also specified as solvents.  The solution may contain between 0.5 and 7.0% of the oil, by weight. Such low-boiling solutions are conveniently stored, under pressure, in valved containers.  The oil itself may be applied to the surface by a wiper or brush. Alternatively, an aqueous emulsion of the oil may be wiped or sprayed on to the surface.