Methacrylic copolymer having low moisture absorption properties

Details Methacrylic copolymer having low moisture absorption properties Methacrylic copolymer having low moisture absorption properties

1990-07-02

1991-08-27

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526309, C08F 1820

Patent

active

050434055

ABSTRACT:
The methacrylic copolymer of the present invention is a novel copolymer having low moisture absorption properties which comprises specific proportions of methyl methacrylate units and tert-butylcyclohexyl methacrylate units, optionally with specific ethylenically unsaturated compound units copolymerizable with the above-mentioned monomer units. The copolymer of the present invention is excellent not only in colorlessness, transparency, moldability, low double refraction and heat stability but also in low moisture absorption properties and heat resistance and, therefore, is suitable for use as a material for shaped articles, such as an optical element substrate and a light transmissible extruded plate, and can particularly advantageously be used for applications, such as an optical disc substrate.

REFERENCES:
patent: 4405671 (1983-09-01), Ozawa et al.
patent: 4509163 (1985-04-01), Kamada et al.
patent: 4680359 (1987-07-01), Liebler et al.
J58127754, Asahi Chemical Ind. KK, 7/29/83.

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