Sheetlike article for optical use

Details Sheetlike article for optical use Sheetlike article for optical use

1994-08-16

1997-03-18

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526321, 5263285, 526336, 526347, C08F22240, C08F22210, C08F22010, C08F23602, C08F21208

Patent

active

056124325

ABSTRACT:
An optical sheetlike article possessing a glass transition point and a softening point both higher than 130.degree. C., a modulus of elasticity when bent of more than 50 kgf/mm.sup.2, a double refraction index not greater than 30 nm, a yellowness index of not greater than 5, a specific gravity of not more than 1.5, an amount of deflection of not more than 10 mm in a load flexure test, and a thickness of more than 0.3 mm and not more than 0.7 mm is provided, and is ideal for use in optical filters for display devices, substrates for liquid crystal display devices, substrates for optical recording discs, and optical lenses, among others.

REFERENCES:
patent: 4351932 (1982-09-01), Street et al.
patent: 4868261 (1989-09-01), Kobayashi et al.
patent: 4918152 (1990-04-01), Moritani et al.
patent: 5155190 (1992-10-01), Okinaka et al.

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