Method of rendering surfaces nonfogging
US4018939A · kind A · utility
13Cited by
6References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 15, 1975 |
| Grant date | Apr 19, 1977 |
| Priority date | — |
| Expiry date | May 15, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/86
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for improving adhesion of nonfogging film coatings comprising a block copolymer containing alternating blocks of polyurethane and a hydrophilic polyacrylic, to a polymeric substrate by subjecting the substrate to a controlled exposure to UV irradiation. Exposure may be prior to or following casting the nonfogging coating in place on the substrate. By varying the weight ratio of polyurethane/polyacrylic it is possible to vary the flexibility of the coating and hence to widen the range of substrates to which the coating may be applied, e.g., from flexible wrapping material to rigid mirrors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.