Optical recording media on which information is stored and method of making same

DETAILED DESCRIPTION In this invention, as a main chain structure of polydiacetylene, A-type bonding and B-type bonding exist.
It is presumed that A-type bonding is acetylene bonding, while B-type bonding is butatriene bonding (see FIG.
1).
Furthermore, it is presumed that for each type bonding, planar configuration and a non-planar configuration exist.
In this invention, it is presumed that optical recording can be performed mainly with a change of the main chain structure between A-type bonding and B-type bonding, and additionally with a change of structure between planar configuration and non-planar configuration.
Recording media according to this invention can be formed as recording media which can be utilized as additional record type (DRAW type) and rewriting type (E-DRAW type).
Polydiacetylene, polydiacetylene thin film, conversion of the main chain structure, absorption and reflection spectra of polydiacetylene, application of radiant energy on polydiacetylene, recording, and reading will be explained in order as follows.
Polydiacetylene In this invention, as polydiacetylene, polymers of a diacetylene monomer can be employed which include all polymers in which a change of the main chain structure is caused by application of radiant energy to the polymers.
Herein, the word "diacetylene monomer" is a generic name of both compounds, having conjugated diacetylene bonding and their derivatives.
As polydiacetylene, polymers of diacetylene monomer can be preferably employed which have, in a side chain, acids, such as carboxylic acid, sulfonic acid, their esters, amides and salts, alcohols and their carboxylic ester, sulfonic ester, sulfinic ester, isocyanic ester, or carbamic ester, hydrocarbon, phenyl, or heterocyclic compound.
For example, a polymer of a diacetylene monomer cn be employed which has the general formula: CH.
sub.
3 (CH.
sub.
2).
sub.
m-1 --C.
tbd.
C--C.
tbd.
C--(CH.
sub.
2).
sub.
n COOH RNHOCO(CH.
sub.
2).
sub.
m --C.
tbd.
C--C.
tbd.
C--(CH.
sub.
2).
sub.
n OCONHR RSO.
sub.
2 O(CH.
sub.
2).
sub.
m --C