Mold material for molding of an optical part and process for producing the same
US5223350A · kind A · utility
12Cited by
9References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1990 |
| Grant date | Jun 29, 1993 |
| Priority date | — |
| Expiry date | Mar 15, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B2215/38
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
There are disclosed a mold material for molding of an optical part, composed of at least the molding surface of a mold for molding, which comprises a sintered body or a coated layer composed mainly of at least one chromium compound selected from chromium oxide, chromium oxycarbide, chromium oxynitride and chromium oxycarbonitride and a process for producing the same. When an optical part is molded by use of the mold of the present invention, the optical part after molding can be easily taken out from the mold, and the mold has a long lifetime, and also the optical part obtained has excellent surface precision.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.