US4894359A
Expired / Lapsed
US
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Heat-sensitive recording paper
Assignee: Ueno Seiyaku Oyo Kenkyujo KK
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Filing: 1988-05-31
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Granted: 1990-01-16
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Expires: 2008-05-31
Abstract
Abstract The present invention provides a novel bis(phenoxymethyl)benzene derivative or bis(naphthoxymethyl)benzene derivative, which improves the stability of image on a heat sensitive recording paper composed of a leuco dye and a developer.
Inventors
- 👤 Ryuzo Ueno
- 👤 Shinichi Katsura
- 👤 Yoshirou Uchiyama
- 👤 Satomi Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:54
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/74; C07C69/757; B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; C07C69/76; C07C69/84; C07C69/92; Y; Y10; Y10S; Y10S428/00; Y10S428/913
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
61 words
A heat sensitive recording paper which contains in its heat sensitive layer a leuco dye, developer, and either of a bis(phenoxymethyl)benzene derivative or bis(naphthoxymethyl)benzene derivative having the general formula (I): ##STR6## wherein: A represents a group ##STR7## where R represents a C 1 -C 4 alkyl group, a phenyl group or benzyl group, and X represents hydrogen atom or halogen atom.
Claim 2
Dependent Claim
61 words
A heat sensitive recording paper which contains in its heat sensitive layer a leuco dye, developer, and either of a bis(phenoxymethyl)benzene derivative or bis(naphthoxymethyl)benzene derivative having the general formula (I): ##STR6## wherein: A represents a group ##STR7## where R represents a C 1 -C 4 alkyl group, a phenyl group or benzyl group, and X represents hydrogen atom or halogen atom.
Claim 3
Dependent Claim
18 words
The heat sensitive recording paper of claim 1, wherein said developer is a phenolic hydroxyl group containing compound.
Claim 4
Dependent Claim
16 words
The heat sensitive recording paper of claim 1, wherein said developer is a hydroxybenzoic acid ester.
Claim 5
Dependent Claim
34 words
The heat sensitive recording paper of claim 1, wherein said leuco dye, developer and bis (phenoxymethyl) benzene derivative or bis (naphthoxymethyl) benzene derivative expressed by the formula (I) is dispersed in a liquid medium.
Claim 6
Dependent Claim
14 words
The heat sensitive recording paper of claim 4, wherein said liquid medium is water.
Claim 7
Dependent Claim
54 words
The heat sensitive recording paper of claim 1, wherein said developer is contained in a range of 100-1000 parts by weight based on 100 parts by weight of said leuco dye, and said compound represented by the formula (I) is in 1-200 parts by weight based on 100 parts by weight of said developer.
Claim 8
Dependent Claim
27 words
The heat-sensitive recording paper of claim 1, wherein said bis(naphthoxymethyl)benzene derivative is a 1,3 benzene derivative, wherein A is naphthylene, R is benzyl and X is hydrogen.
Claim 9
Dependent Claim
27 words
The heat-sensitive recording paper of claim 1, wherein said benzene derivative is a 1,2 benzene derivative, wherein A is naphthylene, R is benzyl an X is hydrogen.
Claim 10
Dependent Claim
29 words
The heat-sensitive recording paper of claim 1, wherein said benzene derivative is a 1,2 benzene derivative wherein A is naphthylene, R is C 1 alkyl and X is hydrogen.
Claim 11
Dependent Claim
27 words
The heat-sensitive recording paper of claim 1, wherein said benzene derivative is a 1,4 benzene derivative, wherein A is naphthylene, R is benzyl and X is hydrogen.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-15 | 1993-07-17 | 1994-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-15 | 1997-07-17 | 1998-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-15 | 2001-07-17 | 2002-01-16 | $7700.00 | Window Closed / Lapsed |