Owens-Corning Fiberglas Corporation

Owens Corning Fiberglas Technology, Inc.

Walter L Eastes

John W Wingert

Don S Goldman

Anna Tarantino

Douglas A Hofmann

Boron-free glass fibers

Glass fibers having suitable properties for reinforcing electrical laminates have a defined viscosity-liquidus relationship, a low coefficient of thermal expansion, a high elastic modulus, and a low dielectric constant.

Glass compositions having low expansion and dielectric constants

A process where calcium borates are precipitated from an aqueous solution of ulexite is disclosed. The ulexite is dissolved in hydrochloric acid. Calcium chloride then is added to the acid solution and then neutralized to precipitate the calcium borates. The calcium borates so produced are useful as glass forming, batch ingredients that can be compacted into agglomerates and preheated.

Method for producing calcium borates

A method of precipitating calcium borates from an aqueous mixture of calcium chloride and borax is disclosed. The yield of calcium borate precipitates can be increased by increasing the concentration of borax. Preferably, an increase in the calcium concentration also is employed. In general, it was found that properties of compacted glass batch produced from these calcium borates compare favorably with those compacted from standard glass batches.

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Granville, OH, United States of America

Walter L Eastes