Ultraviolet curable coatings for optical glass fiber based on a polyfunctional core
US4806574A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1985 |
| Grant date | Feb 21, 1989 |
| Priority date | — |
| Expiry date | Jul 22, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/8175
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An ultraviolet curing liquid coating composition which, when cured with ultraviolet light in the presence of an appropriate photoinitiator, provides a coating adapted for the coating of optical glass fiber. This coating composition comprises as the essential component, an acrylate-terminated polyurethane oligomer based on a polyfunctional core which is at least trifunctional and which supports one branch for each functionality in the core. Each of the branches leads to an acrylate-functional terminal group, with there being from about 150 to about 2500 units of molecular weight in each branch between the trifunctional core and the acrylate-functional terminal group. Depending primarily upon the molecular weight of the branches, one can provide coating compositions for buffer coat, single coat or topcoat use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.