Optical fiber buffer coated with halogenated dihydroxy-terminated polybutadienes
US4572610A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 21, 1984 |
| Grant date | Feb 25, 1986 |
| Priority date | — |
| Expiry date | May 21, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2964
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A radiation-curable diethylenically unsaturated polyurethane resin is disclosed which cures to provide cured coatings possessing reasonable physical integrity at room temperature, a tensile modulus of less than about 10000 psi at -40.degree. C., preferably less than 5000 psi at -60.degree. C., and a high index of refraction, above 1.48. This polyurethane resin is constituted by an essentially saturated, halogenated, dihydroxy-terminated linear liquid polybutadiene polymer, in which the halogen is preferably chlorine, reacted with an organic diisocyanate and a monoethylenically unsaturated monomer carrying a single hydroxy group to form a diethylenic diurethane having a halogen-containing essentially saturated polybutadiene backbone. Coating compositions are disclosed which consist essentially of the above diethylenically unsaturated diurethane having a polybutadiene backbone together with less than 40% of a liquid solvent therefor which is preferably a monoethylenically unsaturated liquid having a low glass transition temperature, and the compositions preferably include a photoinitiator enabling cure on ultraviolet exposure. These coatings are used as a buffer coating on optical gl…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.