Intrinsically low birefringent molding polymers and optical stor

Details Intrinsically low birefringent molding polymers and optical stor Intrinsically low birefringent molding polymers and optical stor

1992-05-26

1993-06-08

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

5263077, 5253268, 5253276, 5253299, 5253305, C08F 2240

Patent

active

052180689

ABSTRACT:
Intrinsically low birefringent molding polymers having a molten stress optic coefficient that is greater than or equal to -1000 Brewsters and less than or equal to +1000 Brewsters, a glass transition temperature of at least 140.degree. C., and a water absorption (A.sub.H.sbsb.2.sub.O) according to ASTM D570-81 after 24 hours immersion in water at 23.degree. C. of less than 0.25 percent comprising in polymerized form at least one structural component providing a positive melt homopolymer stress optic coefficient and at least one other structural component providing a negative melt homopolymer stress optic coefficient.

REFERENCES:
Japan Kokai 85-233106, Optical Disc Materials, English Translation, pp. 1-10.

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