IP Library › Granted Patent US 9,914,996
Granted Patent B2
US 9,914,996 · App. 15/286,668 · Granted Mar 13, 2018

Increasing zinc sulfide hardness

Inventors: Jitendra S. Goela (Andover, MA); Hangyao Wang (Pearland, TX); Hua Bai (Lake Jackson, TX); Michael A. Pickering (Dracut, MA)
Assignees: Rohm and Haas Electronic Materials LLC; Dow Global Technologies LLC
C23C16/306C03C17/22C09D1/00C23C16/01C23C16/305C23C16/44C23C16/46G02B1/10C03C2217/288C03C2217/78C03C2218/152
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Quick Facts
Patent No.
US 9,914,996
App. No.
15/286,668
Granted
Mar 13, 2018
Kind
B2
Abstract

The hardness of zinc sulfide is increased by adding selective elements within a specified range to the crystal lattice of the zinc sulfide. The increased hardness over conventional zinc sulfide does not substantially compromise the optical properties of the zinc sulfide. The zinc sulfide may be used as a protective coating for windows and domes.

Claims (5)

1. A composition comprising water clear zinc sulfide and 1.5 molar % to 3 molar % of silicon.

2. The composition of claim 1 , wherein the composition has a transmission in the LWIR range of 8 μm to 12 μm.

3. An article comprising a substrate and one or more layers of a composition comprising water clear zinc sulfide and 1.5 molar % to 3 molar % of silicon.

4. The article of claim 3 , wherein the substrate is a dome or a window.

5. The article of claim 3 , wherein the article has a transmission in the LWIR range of 8 μm to 12 μm.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 26, 2019
From: ROHM AND HAAS ELECTRONIC MATERIALS LLC; CVD INCORPORATED; ROHM AND HAAS CHEMICALS LLC; ROHM AND HAAS COMPANY
To: HELLMA MATERIALS GMBH
Reel/Frame 051119/0811 →
Continuity (3)
Continuation 14499012 · Sep 26, 2014
Provisional Application 61883090 · Sep 26, 2013
Related Publication 20170022368A1 · Jan 26, 2017