Photosensitive glass
AssigneeCorning Incorporated
InventorsRoger J. Araujo, Nicholas F. Borrelli, Dennis W. Smith
Life of this patent
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Abstract
A photosensitive borosilicate glass which consists essentially in calculated weight percent on an oxide basis of 20-80% SiO.sub.2, 8-40% B.sub.2 O.sub.3, 0-6% Li.sub.2, 0-28% Na.sub.2, 0-25% K.sub.2 O, the total Na.sub.2 O+K.sub.2 O being 10-28%, 0-18% Al.sub.2 O.sub.3 and minor amounts of photosensitizing agents silver, cerium oxide, antimony oxide and bromine and/or chlorine, the cation ratio of R.sub.2 O--Al.sub.2 O.sub.3 to B.sub.2 O.sub.3 being at least 0.6.
Claims8
A photosensitive borosilicate glass which, on an oxide basis as calculated from the glass batch in weight percent, consists essentially of 20-80% SiO.sub.2, 8-40% B.sub.2 O.sub.3, 0-6% Li.sub.2 O, 0-28% Na.sub.2 O, 0-25% K.sub.2 O, the Na.sub.2 O+K.sub.2 O content being 10-28%, 0-18% Al.sub.2 O.sub.3, the cation ratio of (R.sub.2 O--Al.sub.2 O.sub.3):B.sub.2 O.sub.3 being at least 0.6, 0.05-0.3% Ag, an effective amount to promote photosensitivity up to about 0.05% cerium oxide, and an effective amount to enhance photosensitivity and fine the glass up to 0.5% Sb.sub.2 O.sub.3.
Dependencies are inferred from the claim text.