Bleaching and dyeing; fluid treatment and chemical modification – Diffusion transfer dyeing process – transfer sheet and product – Dry heat treatment for penetration
Patent
1991-05-13
1993-02-02
Clingman, A. Lionel
Bleaching and dyeing; fluid treatment and chemical modification
Diffusion transfer dyeing process, transfer sheet and product
Dry heat treatment for penetration
428195, 428211, 428913, 428914, 503227, B41M 538, C09B 5302
Patent
active
051834740
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a heat-sensitive, sublimation transfer cyan dye useful in color hard copies by the thermal, sublimation transfer recording process and also to a transfer sheet therefor.
2. Background Art
The thermal transfer process making use of sublimable dyes is one of thermal transfer printing processes, which comprises coating a condenser paper sheet, whose thickness is several micrometers, or a PET film with a sublimable dye in the form of an ink and then selectively heating the sublimable dye by a thermal head to transfer it to a recording paper sheet. The thermal transfer process is now used as a means for recording various image information as tangible images as hard copies.
Characteristic features of sublimable dyes usable in the thermal transfer process include the availability of a wide variety of colors, excellent mixability, strong dyeability and relatively high stability. In particular, the thermal transfer process has a major characteristic feature hot available from the other photographic printing processes in that the amount of a dye to be sublimed is dependent on thermal energy and the density after dyeing can be controlled in an analog manner.
Indoaniline compounds have attracted particular interests as sublimation-transferable cyan dyes (Japanese Patent Application Laid-Open Nos. 239289/1985, 19396/1986, 22993/1986, 31292/1986 and 308072/1988 and 53893/1989). Although many of these indoaniline compounds are extremely good from the viewpoint of hue, there are only a very small number of indoaniline compounds having various properties required as sublimable dyes such as storage stability and light fastness after transfer, transfer sensitivity.
As a method for improving the transfer sensitivity, it may be contemplated, for example, to reduce the molecular weight. This may however lead to impairment in the post-transfer storage stability. On the other hand, to improve the light fastness and storage stability, introduction of one or more substituents is essential. This however results in an increased molecular weight, thereby not only reducing the transfer sensitivity but also impairing the color hue in many instances.
DISCLOSURE OF INVENTION
The present inventors have carried out an extensive investigation with a view toward overcoming the problems described above. As a result, compounds represented by formula (I) have been found, leading to the completion of the present invention.
The present invention provides a heat-sensitive sublimation transfer cyan dye represented by the following formula (I): ##STR3## wherein R.sub.1 represents a hydrogen atom, an alkyl group, an alkoxyl group, an alkylcarbonylamino group, a formylamino group or a halogen atom, R.sub.2 and R.sub.3 represent an alkyl group, an alkenyl group, an alkoxyalkyl group, an aralkyl group, an aryl group, a halogenoalkyl group or a cyanoalkyl group or are coupled together to form a ring, and X represents any one of the following groups: ##STR4## as well as a heat-sensitive sublimation transfer sheet comprising one or more dyes selected from the group consisting of the dyes represented by the formula (I)
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention will hereinafter be described in detail.
Illustrative of R.sub.1 include C.sub.1 -C.sub.3 lower alkyl groups such as methyl, ethyl, n-propyl and isopropyl; alkoxyl groups such as methoxy, ethoxy and n-propoxy; alkylcarbonylamino groups such as methylcarbonylamino, ethylcarbonylamino and n-propylcarbonylamino; formylamino groups; and halogen atoms such as chlorine and fluorine.
Preferable examples of R.sub.1 include a hydrogen atom, a methyl group, a thyl (sic.) group, a methoxy group and a chlorine atom.
Examples of R.sub.2 and R.sub.3 include C.sub.1 -C.sub.8 alkyl groups such as methyl, ethyl, n-propyl, iso-propyl, n-butyl, n-pentyl, n-hexyl, n-heptyl and n-octyl; alkenyl groups such as allyl, crotyl, 2-butenyl and 3-butenyl; alkoxyalkyl groups such as methoxymethyl, ethoxyethyl, methoxyethyl and ethoxymethyl; aralky
REFERENCES:
patent: 4829047 (1989-05-01), Niwa et al.
patent: 4987120 (1991-01-01), Mikoshiba et al.
patent: 5034371 (1991-07-01), Tanaka et al.
Patent Abstracts of Japan, vol. 12, No. 478 (M-775) (3325), Dec. 14, 1986 and JP-A-63 199687, Aug. 18, 1988.
Patent Abstracts of Japan, vol. 10, No. 109 (M-472) (2166) Apr. 23, 1986 and JP-A-60 239289, Nov. 28, 1985.
Ghoda Isamu
Koshida Hitoshi
Ohyama Tsukasa
Shimokawa Yasushi
Takuma Keisuke
Clingman A. Lionel
Mitsui Toatsu Chemicals Inc.
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