Tin-phosphorus oxyfluoride glasses

• US 4,314,031 A
• Filed: 06/17/1980
• Issued: 02/02/1982
• Est. Priority Date: 06/17/1980
• Status: Expired due to Term

• Current Assignee: Corning Glass Works (Corning Incorporated)
• Original Assignee: Corning Glass Works (Corning Incorporated)
• Inventors: Tick, Paul A., Sanford, Leon M.
• Primary Examiner(s): McCarthy, Helen M.
• Application Number:
  US06/160,387
• Time in Patent Office: 595 Days
• Field of Search: 106/47 Q, 106/47 R, 106/73.1, 106/48, 106/49, 423/618, 423/464, 423/301
• US Class Current: 501/44
• CPC Class Codes: C03C 3/247 containing fluorine and phosphorus
• CPC Class Codes: Y10S 501/901 having R.I. at least 1.8
• CPC Class Codes: Y10S 501/903 having refractive index less than 1.8 and ABBE number less than 70

Abstract

Glass compositions in the tin-phosphorus-oxyfluoride composition system exhibiting very low glass transition temperatures and capable of being modified by the addition of selected constituents to exhibit excellent stability in a humid environment, are described.

Claims

1. A glass comprising, in weight percent on an elemental basis as calculated from the batch, about 20-85% Sn, 2-20% P, 3-20% O, 10-36% F, and at least 75% total of Sn+P+O +F.

2. A glass consisting essentially, in weight percent on an elemental basis as calculated from the batch, of about 20-85% Sn, 2-20% P, 3-20% O, 10-36% F, 0-25% total of cation modifiers selected in the indicated proportions from the group consisting of:

up to 25% Pb, up to 12% Zr, up to 10% Fe, up to 3% Ti, up to 1% Ca, up to 3% Ba, up to 2% Zn, up to 12% total of Fe+Ti+Ca+Ba+Zn, up to 3% total of Na +Li+K, up to 4% Al, and up to 1% Si, and 0-20% total of anion modifiers selected from the group consisting of Cl, Br and I.

3. A glass consisting essentially, in weight percent on an elemental basis as calculated from the batch, of about 50-75% Sn, 2-11% P, 4-13% O, 14-25% F, and 0-22% Pb, wherein the glass has an F/F-max. ratio in the range of about 0.4-0.6.

4. A glass consisting essentially, in weight percent on an elemental basis as calculated from the batch, of about 50-75% Sn, 2-11% P, 4-13% O, 14-25% F, and 0-12% Zr, wherein the glass has an F/F-max. ratio in the range of about 0.4-0.6.

5. A glass consisting essentially, in weight percent on an elemental basis as calculated from the batch, of about 20-30% Sn, 15-20% P, 13-20% O, 30-36% F, 0-12% Pb, 0-4% Al, 0-3% Ba, and 0-1% Si, wherein the glass has an F/F-max. ratio in the range of about 0.7-0.8.