Acrylic flexible light pipe of improved thermal stability
US5930442A · kind A · utility
3Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 14, 1997 |
| Grant date | Jul 27, 1999 |
| Priority date | — |
| Expiry date | Oct 14, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2011/0075
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Acrylic light pipe as described in Bigley et al., U.S. Pat. Nos. 5,406,641 and 5,485,541, has adequate thermal stability for many purposes. It has been found that improved thermal stability, as reflected in color formation, can be imparted by adjusting the polymerization conditions to produce the uncured core polymer of the core/clad construction with a much reduced terminal vinyl content, preferably below 0.5 vinyl groups/1000 monomer units.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.