Polymer blend composition suitable as optical material

Details Polymer blend composition suitable as optical material Polymer blend composition suitable as optical material

1987-12-22

1989-08-29

Bleutge, John C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525199, 525185, 525153, 428394, 350 9629, C08L 2718, G02B 616

Patent

active

048618357

ABSTRACT:
A polymer blend of 2-80 wt % of an acrylic or methacrylic ester base polymer and the balance of a ternary copolymer of vinylidene fluoride (VDF), hexafluoroacetone (HFA) and tetrafluoroethylene (TFE) is very high in transparency and serves as a thermoplastic resin useful for optical purposes. The first polymer of the blend can be selected from homopolymers and copolymers of C.sub.1 -C.sub.4 alkyl acrylates and methacrylates. The second polymer is preferably made up of 2-15 mol % of HFA, 5-60 mol % of TFE and the balance of VDF. The polymer blend has a relatively low index of refraction, which can be controlled by selecting the first and second polymers and/or by varying the blending ratio. The polymer blend is soluble in various organic solvents. Besides, the polymer blend serves as a thermochromic material that becomes opaque by heating and resumes transparency by cooling.

REFERENCES:
patent: 4591616 (1986-05-01), Miyata et al.
patent: 4617350 (1986-10-01), Maeda et al.
patent: 4731417 (1988-03-01), Miyata et al.

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