Claims
- 1. An optical information recording medium comprising two disc substrates, which are adhered directly or through a convex portion formed on at least one of the substrates or a spacer provided between the substrates by an adhesive layer, and a recording layer which is capable of recording and/or reading information by laser beam and which is provided on a surface of at least one of the substrates facing the other substrate, wherein the adhesive layer comprises an ultraviolet-curing epoxy adhesive composition comprising a light-initiator which produces a cationic polymerization initiator upon irradiation with ultraviolet rays and an epoxy compound having two or more epoxy groups per molecule.
- 2. An optical information recording medium as in claim 1, wherein said light initiator is a diazonium salt.
- 3. An optical information recording medium as in claim 1, wherein said light initiator is an onium salt.
- 4. An optical information recording medium as in claim 1, wherein said light initiator is a thiopyrylium salt.
- 5. An optical information recording medium as in claim 1, wherein said light initiator is a hydroxybenzophenone methane sulfonate ester.
- 6. An optical information recording medium as in claim 1, wherein said light initiator is a diaryliodosyl salt.
- 7. An optical information recording medium as in claim 1, wherein said light initiator is an organic metal complex cation.
- 8. An optical information recording medium as in claim 1, wherein said spacers are made of a material having the same thermal expansion coefficient and humidity expansion coefficient as that of the substrates.
- 9. An optical information recording medium as in claim 1, wherein said recording layer has a thickness of from 150 to 1,000 .ANG..
- 10. An optical information recording medium as in claim 1, wherein a subbing layer is present between the inner surface of the substrate and the recording layer.
- 11. An optical information recording medium as in claim 10, wherein the subbing layer has a thickness within the range of from 0.01 to 10 .mu.m.
- 12. An optical information recording medium as in claim 1, wherein said adhesive composition further comprises a sensitizer.
- 13. An optical information recording medium as in claim 12, wherein said sensitizer has an absorption wavelength of from 300 to 450 nm.
- 14. An optical information recording medium as in claim 1, wherein the weight mixing ratio of the light initiator to the epoxy compound is within the range of from 0.0001/1 to 0.1/1.
- 15. An optical information recording medium as in claim 12, wherein said sensitizer is selected from the group consisting of anthracene, benzophenone, pyrene, thioxanthone, and phenothiazine.
Priority Claims (1)
Number |
Date |
Country |
Kind |
60-5538 |
Jan 1985 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 06/819,326, filed Jan. 16, 1986, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4434429 |
Terao et al. |
Feb 1984 |
|
4499477 |
Davies et al. |
Feb 1985 |
|
Continuations (1)
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Number |
Date |
Country |
Parent |
819326 |
Jan 1986 |
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