Dual curing coating method for substrates with shadow areas
US4699802A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1985 |
| Grant date | Oct 13, 1987 |
| Priority date | — |
| Expiry date | Apr 29, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K3/285
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method of curing a liquid silicone composition to a crosslinked polymer on a substrate having shadow areas no readily accessible to direct UV light, the method comprising: PA0 (a) applying a liquid composition to the substrate in a manner so as to cover both the light accessible and the shadow areas, the composition comprising a radical photoinitiator and a crosslinkable polydihydrocarbylsiloxane prepolymer having a molecular weight of at least 1000, having a plurality of acrylate or methacrylate groups bound thereto and further including a plurality of groups of the formula ##STR1## where R.sup.1 is a hydrolyzable organic group and R.sup.2 is R.sup.1 or, if R.sup.1 is dialkylamino, R.sup.2 is R.sup.1 or hydrocarbyl; PA0 (b) irradiation the substrate with UV irradiation sufficient to substantially cure the composition in the areas directly accessible to UV light, and PA0 (c) exposing the composition on the substrate to moisture for sufficient time to cure the composition in the shadow areas. Suitable polydihydrocarbyl siloxanes have the formula: ##STR2## where n is an integer, R.sup.1 is selected from amino, oxime or --OOCR.sup.3, R.sup.2 is R.sup.1 or hydrocarbyl, provided that …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.