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US4485168A Expired / Lapsed US ⏱️ 0.0 years remaining

Photochromic photosensitive composition

Assignee: Sony Corp
•
Filing: 1982-08-28
•
Granted: 1984-11-27
•
Expires: 2002-08-28
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Abstract

Abstract PCT No. PCT/JP82/00345 Sec. 371 Date Apr. 21, 1983 Sec. 102(e) Date Apr. 21, 1983 PCT Filed Aug. 28, 1982 PCT Pub. No. WO83/00873 PCT Pub. Date Mar. 17, 1983.A photochromic photosensitive composition contains a benzothiazolinospiropyran compound represented by the general formula: <IMAGE> wherein R1 represents an alkyl group containing 1 to 10 carbon atoms, R2 represents an alkyl group containing 1 to 10 carbon atoms or a phenyl group, R3 represents a hydrogen atom, a halogen atom, a methoxy group or an alkyl group containing 1 to 5 carbon atoms, and R4 represents a hydrogen atom, an alkyl group containing 1 to 5 carbon atoms, a methoxy group or a methylthio group, dissolved or dispersed in a bisphenol A type polyether resin for enhancing thermal stability of the compound in a colored state. Addition of a phenol to the composition serves to further enhance the heat stability. As compared with conventional photochromic compositions, this photochromic photosensitive composition is thermally extremely stable in a colored state, and the developed color image can be stored for an enough long time to be suited for long-time recording.

Inventors

  • 👤 Seiichi Arakawa
  • 👤 Koichi Kawasumi
  • 👤 Junetsu Seto

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 09:12
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/685; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/163

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 167 words
A photosensitive composition capable of producing a colored image by exposure to ultraviolet radiation, said image being stable to heat, consisting essentially of a photochromic spiropyran compound having the following formula: ##STR8## where R, represents an alkyl group containing 1 to 10 carbon atoms, R 2 represents an alkyl group containing 1 to 10 carbon atoms or a phenyl group, R 3 represents a hydrogen atom, a halogen atom, a methoxy group or an alkyl group containing 1 to 5 carbon atoms and R 4 represents a hydrogen atom, an alkyl group containing 1 to 5 carbon atoms, a methoxy group or a methylthio group, said spiropyran compound being dispersed in a mixture of bisphenol A type polyether resin and a phenol, said spiropyran compound being present in an amount ranging from 3 to 60 parts by weight per 100 parts by weight of said bisphenol A type resin, wherein said phenol is contained at a weight ratio of 1/10 to 2 relative to said spiropyran compound.
Claim 2
Dependent Claim 167 words
A photosensitive composition capable of producing a colored image by exposure to ultraviolet radiation, said image being stable to heat, consisting essentially of a photochromic spiropyran compound having the following formula: ##STR8## where R, represents an alkyl group containing 1 to 10 carbon atoms, R 2 represents an alkyl group containing 1 to 10 carbon atoms or a phenyl group, R 3 represents a hydrogen atom, a halogen atom, a methoxy group or an alkyl group containing 1 to 5 carbon atoms and R 4 represents a hydrogen atom, an alkyl group containing 1 to 5 carbon atoms, a methoxy group or a methylthio group, said spiropyran compound being dispersed in a mixture of bisphenol A type polyether resin and a phenol, said spiropyran compound being present in an amount ranging from 3 to 60 parts by weight per 100 parts by weight of said bisphenol A type resin, wherein said phenol is contained at a weight ratio of 1/10 to 2 relative to said spiropyran compound.
Claim 3
Dependent Claim 36 words
The photosensitive composition according to claim 1, wherein said spiropyran compound is contained in an amount ranging from 5 to 40 parts by weight per 100 parts by weight of said bisphenol A type polyether resin.
Claim 4
Dependent Claim 25 words
The photosensitive composition according to claim 1, wherein said phenol is contained at a weight ratio of 1/5 to 1 relative to said spiropyran compound.
Claim 5
Dependent Claim 39 words
The photosensitive composition according to claim 1, wherein said phenol is selected from the group consisting of bisphenol A, p-nitrophenol, t-butylphenol, 1,3,5-tribromophenol, phenol-formaldehyde resin, cresol-formaldehyde resin, phenol resins modified by drying oils and phenol resins modified by natural resins.

References Cited (Backward Citations)

DE2252845A1 Cited
JPS4920389A Cited
JPS4922389A Cited
JPS4928121A Cited
US4237207A Cited
US4180405A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1987-11-27 1988-05-28 1988-11-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1991-11-27 1992-05-28 1992-11-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1995-11-27 1996-05-28 1996-11-27 $7700.00 Window Closed / Lapsed

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