Libbey-owens-ford Co.

Pilkington Plc

Pilkington North America, Inc.

Libbey-ownes-ford Co.

Bret E Penrod

Paige L Higby

Rodney G Baker

Kenneth Melvin Fyles

J Joseph Cheng

Helen Louise McPhail

Dean E Vernacotola

An infrared and ultraviolet absorbing soda-lime-silica glass of a neutral tint containing 0.3% to 0.7% by weight total iron expressed as FeO, together with amounts of Se, CoOand a ferrous iron content to provide a ratio of ferrous iron to total iron in the range of 21 to 34. NiO and TiOmay be added to the glass. The resultant glass, in a nominal 4 mm thickness, has a visible light transmission of at least 70% and a direct solar heat transmission at least 12 percentage points below the visible light transmission. The iron in the glass is preferably provided by the inclusion of the mineral wuestite in the glass batch formulation.

Glass compositions

A process and glass batch composition are provided for producing a soda-lime-silica glass containing oxides of iron. The process includes admixing, heating and melting a soda-lime-silica float glass batch mixture in which wuestite is included as at least a partial source of the iron oxides in the resulting glass.

Glass production method using wuestite

A process and glass batch composition are provided for producing a soda-lime-silica glass containing oxides of iron. The process includes admixing, heating and melting a soda-lime-silica float glass batch mixture comprising sand, soda ash, dolomite, limestone, and a sulfate selected from the group consisting of salt cake and gypsum. In addition, wuestite is included in the batch as at least a partial source of the iron oxides in the resulting glass.

A solar heat reducing and ultraviolet absorbing soda-lime-silica glass of a neutral tint and high visible light transmittance. The glass has the essential colorants of from about 0.1 to about 0.7 weight percent Fe.sub.2 O.sub.3 (total iron), and either from about 0.1 to about 1.0 weight percent of a compound selected from the group consisting of titanium dioxide, vanadium pentoxide, and ceric oxide, or alternatively from about 0.1 to about 2.0 weight percent of a combination of colorants selected from the group, and having a ferrous value of less than 35 percent.

Neutral colored glass compositions

A neutral, generally green colored, infrared energy and ultraviolet radiation absorbing glass composition comprises conventional soda-lime-silica float glass ingredients, a relatively high concentration of moderately reduced iron, and titanium oxide(s). The resultant glass exhibits an Illuminant A visible light transmittance of at least 70%, a total solar energy transmittance not greater than about 46%, and an ultraviolet radiation transmittance not greater than approximately 38%, at selected glass thicknesses in the range of 3 mm to 5 mm. The titanium oxide(s) as well as at least a portion of the iron in the glass is provided by the inclusion of the mineral ilmenite in the glass batch formulation.

Glass production method using ilmenite

A neutral, generally green colored, infrared energy and ultraviolet radiation absorbing glass composition comprises conventional soda-lime-silica float glass ingredients, a relatively high concentration of moderately reduced iron, and titanium oxide(s). The resultant glass exhibits an Illuminant A visible light transmittance of at least 70%, a total solar energy transmittance not greater than about 46%, and an ultraviolet radiation transmittance not greater than approximately 38%, at selected glass thicknesses in the range of 3mm to 5mm. The titanium oxide(s) as well as at least a portion of the iron in the glass is provided by the inclusion of the mineral ilmenite in the glass batch formulation.

An infrared and ultraviolet absorbing soda-lime-silica glass of a neutral tint containing 0.3% to 0.7% by weight total iron expressed as Fe.sub.2 O.sub.3, together with amounts of Se, Co.sub.3 O.sub.4 and a ferrous iron content to provide a ratio of ferrous iron to total iron in the range of 21 to 34. NiO and TiO.sub.2 may be added to the glass. The resultant glass, in a nominal 4 mm thickness, has a visible light transmission of at least 70% and a direct solar heat transmission at least 12 percentage points below the visible light transmission. The iron in the glass is preferably provided by the inclusion of the mineral wuestite in the glass batch formulation.

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Toledo, OH, United States of America

Bret E Penrod