USRE38979EExpiredUtility

Optical information recording medium and composition for optical information recording film

57
Assignee: MITSUI CHEMICALS INCPriority: Dec 2, 1992Filed: Mar 1, 2001Granted: Feb 14, 2006
Est. expiryDec 2, 2012(expired)· nominal 20-yr term from priority
Inventors:Tadashi KoikeHideki UmeharaYuji InatomiTakeshi TsudaSumio Hirose
G11B 7/2492G11B 2007/24612G11B 7/2495G11B 7/248G11B 7/2542G11B 7/26G11B 7/2595G11B 7/24G11B 7/2534Y10S430/146Y10S428/913G11B 7/246Y10T428/21
57
PatentIndex Score
2
Cited by
74
References
32
Claims

Abstract

An optical information recording medium is here disclosed which comprises a transparent substrate, a recording layer comprising an organic dyestuff on which information can be written by a laser beam, a reflective layer and a protective layer formed in this order on the substrate, the aforesaid optical information recording medium being characterized by containing a pit-edge control agent for the formation of recording pits, particularly a dyestuff thermal decomposition accelerator in the recording layer. By the addition of the pit-edge control agent, deviation properties and jitter properties can be remarkably improved, whereby a CD-R medium having a low error rate and good recording properties can be provided. In consequence, stable compatibility with a commercial CD player can be secured.

Claims

exact text as granted — not AI-modified
1. A composition for a pit-forming optical information recording medium which comprises an organic dyestuff comprising a phthalocyanine compound and an effective amount for pit edge control of a pit-edge control agent, wherein said pit-edge control agent is a thermal decomposition accelerator for the dyestuff, is a metallic compound, has substantially no absorption at the wavelength of a recording laser beam, and is soluble in a solvent for the organic dyestuff and
 wherein the amount of said pit-edge control agent is in the range of from 0.1 to 1,000 parts by weight based on 100 parts by weight of the organic dyestuff and wherein the pit- edge control agent decreases the thermal decomposition starting temperature of the organic dyestuff at least  10 ° C.    
 
     
     
       2. The composition for an optical information recording medium according to  claim 1  wherein said metallic compound is a metallocene or its derivative. 
     
     
       3. The composition for an optical information recording medium according to  claim 1  wherein said metallic compound is a β-diketonato metal complex represented by formula (1): 
                 
 
       wherein each of the substituents X, Y and Z is independently a hydrogen atom, a halogen atom, R 1 , OR 2 , SR 3 , COOR 4 , COONR 5 R 6 , SiR 7 R 8 R 9  or NR 10 R 11 , and M n+  is a metal having a valency of n (wherein R 1  is an unsubstituted or substituted alkyl group, aryl group or unsaturated alkyl group, and each of R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10  or R 11  is a hydrogen atom, an unsubstituted or substituted alkyl group, aryl group or unsaturated alkyl group). 
     
     
       4. The composition for an optical information recording medium according to  claim 1  wherein said metallic compound is an anti-knocking agent. 
     
     
       5. The composition for an optical information recording medium according to  claim 1  wherein said organic dyestuff is a phthalocyanine compound. 
     
     
       6. The composition for an optical information recording medium according to  claim 5  wherein said phthalocyanine compound is a halogenated phthalocyanine. 
     
     
       7. A method for preparing an optical information recording medium which comprises the steps of:
 dissolving the composition of  claim 1  in a solvent to form a solution, and  
 coating the thus obtained solution on a transparent substrate,  
 thereby forming a recording layer comprising the organic dyestuff and the pit-edge control agent.  
 
     
     
       8. A composition for a pit- forming optical information recording medium which comprises an organic dyestuff comprising a phthalocyanine compound and an effective amount for pit edge control of a pit - edge control agent, wherein said pit - edge control agent is a thermal decomposition accelerator for the dyestuff, is an iron metallic compound, has substantially no absorption at the wavelength of a recording laser beam, and is soluble in a solvent for the organic dyestuff and      wherein the amount of said pit - edge control agent in said composition is in the range of from  0 . 1  to  1 , 000  parts by weight based on  100  parts by weight of the organic dyestuff and wherein the pit - edge control agent decreases the thermal decomposition starting temperature of the phthalocyanine compound at least  10 ° C.     
     
     
       9. The composition for an optical information recording medium according to  claim 8  wherein the pit- edge control agent decreases the thermal decomposition starting temperature of the phthalocyanine compound at least  25 ° C.   
     
     
       10. The composition for an optical information recording medium according to  claim 8  wherein the phthalocyanine compound and the pit- edge control agent are physically or chemically interacted.   
     
     
       11. A composition suitable for forming a recording layer in a pit- forming optical information recording medium which comprises an organic dyestuff comprising a phthalocyanine compound and an effective amount for pit edge control of a pit - edge control agent selected from the group consisting of ferrocene and derivatives of ferrocene, wherein said pit - edge control agent is a thermal decomposition accelerator for the dyestuff, has substantially no absorption at the wavelength of a recording laser beam, and is soluble in a solvent for the organic dyestuff and      wherein the amount of said pit - edge control agent in said composition is in the range of from  0 . 1  to  1 , 000  parts by weight based on  100  parts by weight of the organic dyestuff and wherein the pit - edge control agent decreases the thermal decomposition starting temperature of the organic dyestuff at least  10 ° C.     
     
     
       12. The composition suitable for forming a recording layer in an optical information recording medium according to  claim 11  wherein the pit- edge control agent decreases the thermal decomposition starting temperature of the organic dyestuff at least  25 ° C.   
     
     
       13. The composition suitable for forming a recording layer in an optical information recording medium according to  claim 11  wherein the derivatives of ferrocene have a substituent selected from the group consisting of alkyl groups having  1 - 10  carbon atoms, acyl groups having  2 - 10  carbon atoms, aryl groups having  6 - 10  carbon atoms, aryloyl groups having  7 - 10  carbon atoms, aldehyde groups having  1 - 10  carbon atoms, carboxyl groups having  1 - 10  carbon atoms, alkoxy groups having  1 - 10  carbon atoms, amino groups having  0 - 10  carbon atoms, a hydroxyl group, halogen atoms and alkenyl groups having  2 - 10  carbon atoms. 
     
     
       14. The composition suitable for forming a recording layer in an optical information recording medium according to  claim 11  wherein the derivatives of ferrocene have a substituent selected from the group consisting of alkyl groups having  1 - 10  carbon atoms, acyl groups having  2 - 10  carbon atoms and a benzoyl group. 
     
     
       15. The composition suitable for forming a recording layer in an optical information recording medium according to  claim 11  wherein the pit- edge control agent is ferrocene.   
     
     
       16. The composition suitable for forming a recording layer in an optical information recording medium according to  claim 11  wherein the organic dyestuff and the pit- edge control agent are physically or chemically interacted.   
     
     
       17. The composition for an optical information recording medium according to  claim 1  wherein the pit- edge control agent decreases the thermal decomposition starting temperature of the organic dyestuff at least  25 ° C.   
     
     
       18. The composition for an optical information recording medium according to  claim 1  wherein the organic dyestuff and the pit- edge control agent are physically or chemically interacted.   
     
     
       19. A composition which is in the form of a solution and which is suitable for forming a recording layer in a pit- forming optical information recording medium comprising a solvent having dissolved therein an organic dyestuff comprising a phthalocyanine compound and an effective amount for pit edge control of a pit - edge control agent, wherein said pit - edge control agent is a thermal decomposition accelerator for the dyestuff, is a metallic compound, and has substantially no absorption at the wavelength of a recording laser beam, and      wherein the amount of said pit - edge control agent in said composition is in the range of from  0 . 1  to  1 , 000  parts by weight based on  100  parts by weight of the organic dyestuff and wherein the pit - edge control agent decreases the thermal decomposition starting temperature of the organic dyestuff at least  10 ° C.     
     
     
       20. The composition according to  claim 19  wherein the pit- edge control agent decreases the thermal decomposition starting temperature of the organic dyestuff at least  25 ° C.   
     
     
       21. The composition according to  claim 19  wherein the pit control agent is selected from the group consisting of ferrocene and derivatives of ferrocene. 
     
     
       22. The composition according to  claim 21  wherein the derivatives of ferrocene have a substituent selected from the group consisting of alkyl groups having  1 - 10  carbon atoms, acyl groups having  2 - 10  carbon atoms, aryl groups having  6 - 10  carbon atoms, aryloyl groups having  7 - 10  carbon atoms, aldehyde groups having  1 - 10  carbon atoms, carboxyl groups having  1 - 10  carbon atoms, alkoxy groups having  1 - 10  carbon atoms, amino groups having  0 - 10  carbon atoms, a hydroxyl group, halogen atoms and alkenyl groups having  2 - 10  carbon atoms. 
     
     
       23. The composition according to  claim 21  wherein the derivatives of ferrocene have a substituent selected from the group consisting of alkyl groups having  1 - 10  carbon atoms, acyl groups having  2 - 10  carbon atoms and a benzoyl group. 
     
     
       24. The composition according to  claim 19  wherein the pit- edge control agent is ferrocene.   
     
     
       25. The composition according to  claim 19  wherein the organic dyestuff and the pit- edge control agent are physically or chemically interacted.   
     
     
       26. A method for preparing an optical information recording medium which comprises the steps of:
   forming a solution comprised of a solvent having dissolved therein an organic dyestuff comprising a phthalocyanine compound and a pit - edge control agent wherein said pit - edge control agent is a thermal decomposition accelerator for the dyestuff, is a metallic compound, and has substantially no absorption at the wavelength of a recording laser beam,        wherein the amount of said pit - edge control agent in said composition is in the range of from  0 . 1  to  1 , 000  parts by weight based on  100  parts by weight of the organic dyestuff and wherein the pit - edge control agent decreases the thermal decomposition starting temperature of the organic dyestuff at least  10 ° C., and coating the thus obtained solution on a substrate,        thereby forming a recording layer comprising the organic dyestuff and the pit - edge control agent.     
     
     
       27. The method according to  claim 26  wherein the pit- edge control agent decreases the thermal decomposition starting temperature of the organic dyestuff at least  25 ° C.   
     
     
       28. The method according to  claim 26  wherein the pit- edge control agent is selected from the group consisting of ferrocene and derivatives of ferrocene.   
     
     
       29. The method according to  claim 28  wherein the derivatives of ferrocene have a substituent selected from the group consisting of alkyl groups having  1 - 10  carbon atoms, acyl groups having  2 - 10  carbon atoms, aryl groups having  6 - 10  carbon atoms, aryloyl groups having  7 - 10  carbon atoms, aldehyde groups having  1 - 10  carbon atoms, carboxyl groups having  1 - 10  carbon atoms, alkoxy groups having  1 - 10  carbon atoms, amino groups having  0 - 10  carbon atoms, a hydroxyl group, halogen atoms and alkenyl groups having  2 - 10  carbon atoms. 
     
     
       30. The method according to  claim 28  wherein the derivatives of ferrocene have a substituent selected from the group consisting of alkyl groups having  1 - 10  carbon atoms, acyl groups having  2 - 10  carbon atoms and a benzoyl group. 
     
     
       31. The method according to  claim 26  wherein the pit- edge control agent is ferrocene.   
     
     
       32. The method of  claim 26  wherein the organic dyestuff and the pit- edge control agent are physically or chemically interacted.

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