Process for preparation of methacrylimide group containing polymer and light-transmitting fiber comprising polymer made by the process
US5023302A · kind A · utility
5Cited by
6References
8Claims
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Key dates
| Filing date | Aug 28, 1989 |
| Grant date | Jun 11, 1991 |
| Priority date | — |
| Expiry date | Aug 28, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2800/20
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A methacrylimide group-containing polymer having good optical characteristics, especially a resistance to coloration under heating and above to retain good light-transmitting characteristics for a long time even at a high temperature, is prepared by polymerizing methacrylic acid, a methacrylic acid ester, or a monomer mixture predominantly comprised of methacrylic acid or an ester thereof in the absence of a mercaptan chain transfer agent, and then imidizing the thus-prepared polymer. The resulting polymer is useful as the core component of a light-transmitting fiber having a core-sheath structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.