Imperial Chemical Industries Limited

Cyril John Lewis

Neil Hunter Ray

William Derek Robinson

Neil Carter

The production of shaped glass articles is undertaken by an injection moulding process by charging a particulate inorganic glass having a transformation temperature of not greater than 300.degree. C to an injection moulding machine; by converting the glass to a molten state in the barrel of the machine; and by injecting the molten glass into a mould on the machine.

Glass injection moulding process

A glass having a good combination of anti-misting properties and durability to water is produced from an inorganic glass composition comprising:

Phosphate glass compositions

An optical article, for example, a lens, window or mirror, at least part of the surface of which, and preferably the whole of which, is an inorganic oxide glass having a P.sub.2 O.sub.5 content of at least 52 mole %, and preferably 55 to 68.5 mole %, an alkaline earth content of 2.7 to 20 mole %, and a transformation temperature of not greater than 300.degree. C, the glass optionally containing B.sub.2 O.sub.3 and at least one alkali metal oxide.

Anti-misting inorganic oxide glass compositions

Phosphate glasses containing minor amounts of the oxides of chromium, molybdenum and tungsten (Group VIb) have improved water resistance and low softening points. Suitable compositions are within the range (moles percent)

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Runcorn, United Kingdom

Cyril John Lewis