Method for making optical recording mediums

Claim 1

A method for making an optical recording medium, comprising: (a) immersing a substrate having a hydrophilic surface in a non-aqueous solution of a substance having a --C≡C--C≡C--diacetylene group and a --Si--Cl group in an organic solvent to form a monomolecular film of the substance on the substrate by chemical adsorption between the hydrophilic surface and the --Si--Cl group; (b) irradiating the thus immersed substrate with an energy beam to activate and polymerize the diacetylene groups in the monomolecular film thereby forming an optical recording layer, whereby the monomolecular film serving as the optical recording layer has a polydiacetylene bonding assuming a certain color which is capable of undergoing a photochromic color change on irradiation with light energy beams and is aligned under the substrate; repeating the immersing step when the substance has a substituent capable of reacting with the --Si--Cl group to form a monomolecular built-up film; and then subjecting the built-up film to step (b) to thereby form polydiacetylene bonds in the respective layers of the film.

Claim 2

A method for making an optical recording medium, comprising: (a) immersing a substrate having a hydrophilic surface in a non-aqueous solution of a substance having a --C≡C--C≡C--diacetylene group and a --Si--Cl group in an organic solvent to form a monomolecular film of the substance on the substrate by chemical adsorption between the hydrophilic surface and the --Si--Cl group; (b) irradiating the thus immersed substrate with an energy beam to activate and polymerize the diacetylene groups in the monomolecular film thereby forming an optical recording layer, whereby the monomolecular film serving as the optical recording layer has a polydiacetylene bonding assuming a certain color which is capable of undergoing a photochromic color change on irradiation with light energy beams and is aligned under the substrate; repeating the immersing step when the substance has a substituent capable of reacting with the --Si--Cl group to form a monomolecular built-up film; and then subjecting the built-up film to step (b) to thereby form polydiacetylene bonds in the respective layers of the film.

Claim 7

A method for making an optical recording medium comprising: (a) immersing a substrate having a hydrophilic surface in a non-aqueous solution of a first substance provided with a --C≡C--C≡C-- diacetylene group and a --Si--Cl group and is terminated with a --CH═CH 2 group at one end in an organic solvent to form a monomolecular film of the first substance on the substrate by chemical adsorption on that the --CH═CH 2 group is exposed and juxtaposed onto the substrate; (b) converting the --CH═CH 2 group into a --CH 2 CH 2 OH group after the step (a); (c) immersing the substrate in a non-aqueous solution of a second substance having a diacetylene group and a --Si--Cl group to form a monomolecular film of the second substance by chemical adsorption and thereby forming a monomolecular double-layer built-up film; (d) irradiating the substrate obtained in step (c) with an energy beam to activate and polymerize the diacetylene groups in the respective layers thereby forming an optical recording layer, whereby the monomolecular built-up film has polydiacetylene bonds assuming a certain color which undergoes a photochromic color change on irradiation with a light energy beam; and irradiating the thus immersed substrate with an energy beam to activate and polymerize the diacetylene groups in the monomolecular film prior to step (b).

Claim 8

A method for making an optical recording medium comprising: (a) immersing a substrate having a hydrophilic surface in a non-aqueous solution of a first substance provided with a --C≡C--C≡C-- diacetylene group and a --Si--Cl group and is terminated with a --CH═CH 2 group at one end in an organic solvent to form a monomolecular film of the first substance on the substrate by chemical adsorption on that the --CH═CH 2 group is exposed and juxtaposed onto the substrate; (b) converting the --CH═CH 2 group into a --CH 2 CH 2 OH group after the step (a); (c) immersing the substrate in a non-aqueous solution of a second substance having a diacetylene group and a --Si--Cl group to form a monomolecular film of the second substance by chemical adsorption and thereby forming a monomolecular double-layer built-up film; (d) irradiating the substrate obtained in step (c) with an energy beam to activate and polymerize the diacetylene groups in the respective layers thereby forming an optical recording layer, whereby the monomolecular built-up film has polydiacetylene bonds assuming a certain color which undergoes a photochromic color change on irradiation with a light energy beam; and irradiating the thus immersed substrate with an energy beam to activate and polymerize the diacetylene groups in the monomolecular film prior to step (b).