Flat transparent top coat for retroreflective sheeting
US4808471A · kind A · utility
48Cited by
17References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 4, 1988 |
| Grant date | Feb 28, 1989 |
| Priority date | — |
| Expiry date | Jan 4, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31554
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The novel retroreflective sheeting has a flat transparent top coat which is as tough and as resistant to solvents and abrasion as are alkyd resins, and as weather resistant as are acrylic polyesters. That top coat is made from a mixture of hydroxy-functional acrylic polyol and a curing agent which is an aliphatic polyfunctional isocyanate such as the biuret of 1,6-hexamethylene diisocyanate. The retroreflective sheeting may have a dual-layer top coat, the outer layer being relatively hard to provide good resistance to solvents, abrasion and weathering, and the inner layer being softer to make the sheeting more conformable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.