Optical disc and method of manufacturing the same
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United States of America Patent
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May 8, 1990
Issued Date -
N/A
app pub date -
Sep 30, 1988
filing date -
Mar 28, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical resin consisting essentially of a radical polymerization polymer of an ethylenically unsaturated monomer, characterized in that at least a major part of the ethlenically unsaturated monomer is an ester of 1 mole of tricyclo[5,2,1,0.sup.2,6 ]decanedimethanol with 2 moles of a mixture of acrylic acid and metharcylic acid. Because the resin is a polymer obtained from the restricted monomer as specified above, the resin possesses high thermal resistance and high heat stability as well as low hygroscopic property. Dimethanol compounds from higher Diels-Alder adducts of cyclopentadine are also used in place of the tricyclo [5,2,1,0.sup.2,6 ]decanedimthanol which is a Diels-Alder adduct of two moles of cyclopentadiene.
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