Retroreflective articles with wash durable bead bond layers
US10261222B2 · kind B2 · utility
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26References
21Claims
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Key dates
| Filing date | Jun 10, 2015 |
| Grant date | Apr 16, 2019 |
| Priority date | — |
| Expiry date | Jan 6, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/002
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Retroreflective articles include a layer of optical elements, and a polyurethane bead bond layer. The optical elements include transparent microspheres, and at least one reflective layer. The polyurethane bead bond layer is the reaction product of a reaction mixture of at least one aliphatic polycarbonate polyol and at least one polyisocyanate, and the reaction mixture is free of polyols containing unsaturated groups. The retroreflective articles have improved wash durability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.