Retroreflective sheeting
US4721649A · kind A · utility
69Cited by
35References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 8, 1987 |
| Grant date | Jan 26, 1988 |
| Priority date | — |
| Expiry date | Jun 8, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31601
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A retroreflective sheeting utilizing a particular polymer as the bead bond layer is disclosed. The polymeric bead bond comprises urethane and urea linkages, and has a stage prior to thermosetting in which it may be softened by the application of heat and in which it has a relatively nontacky character. The retroreflective sheeting disclosed possesses the unique combination of high reflectance and superior exterior durability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.