Optical plastics material using methacrylic resin and fluorocopolymer
US4591616A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1985 |
| Grant date | May 27, 1986 |
| Priority date | — |
| Expiry date | Aug 22, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L61/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Copolymers of vinylidene fluoride (VDF) and hexafluoroacetone (HFA) exhibit lower indices of refraction than polymethyl methacrylate (PMMA) and can be blended well with PMMA at widely variable ratios. The obtained blends are thermoplastic resins which can easily be moulded or extruded into desirably shaped and transparent members having good mechanical properties and weather resistance. The blends are soluble in various organic solvents. It is preferable that the amount of HFA in the copolymer is not more than 90 mol %. The refractive index of a member formed of the blend falls in the range of about 1.37-1.49 and can freely be controlled by controlling the weight ratio of PMMA to VDF/HFA copolymer. The blend is useful for optical fibers, cylindrical lenses, etc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.