Topcoats for buffer-coated optical fiber using urethane acrylate and epoxy acrylate and vinyl monomer
US4472019A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1982 |
| Grant date | Sep 18, 1984 |
| Priority date | — |
| Expiry date | Dec 28, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S525/922
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Radiation-curable coating compositions adapted for application to buffer-coated optical fibers are disclosed. These are intended to apply an adherent topcoat having greater toughness and greater hardness than the buffer coating. The new compositions comprise: (1) from 25% to 70% of diethylenic-terminated polyurethane, which may include urea linkages, the polyurethane being based on a diisocyanate having an average molecular weight of from 400 to 5000; (2) from 5% to 40% of a diethylenically unsaturated ester of a diglycidyl ether of a bisphenol, said ether having a molecular weight up to about 1000; and (3) from 5% to 30% of liquid radiation-curable monoethylenically unsaturated monomer having a T.sub.g above about 55.degree. C., especially N-vinyl pyrrolidone. Ultraviolet cures using acrylates as the ethylenic group are preferred.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.