US4921535A
Expired / Lapsed
US
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Heat-sensitive recording material
Assignee: BASF Corp
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Filing: 1988-06-13
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Granted: 1990-05-01
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Expires: 2008-06-13
Abstract
Abstract A heat-sensitive recording material whose color reactant system comprises a color former, a developer for said color former and, in addition, a sulfamide compound of formula ##STR1## wherein R 1 , R 2 and R 3 are each independently hydrogen, alkyl containing not more than 12 carbon atoms which is unsubstituted or substituted by halogen, hydroxy, cyano or lower alkoxy; C 5 -C 10 cycloalkyl; phenalkyl, phenyl or naphthyl, each unsubstituted or ring-substituted by halogen, cyano, lower alkyl or lower alkoxy, or --NR 2 R 3 is 5- or 6-membered, preferably saturated, heterocyclic radical; with the proviso that R 1 , R 2 and R 3 may not simultaneously by hydrogen.
Inventors
- 👤 Hermann Nachbur
- 👤 Rosalinde Braun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:20
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/337; B41M5/3375
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
78 words
A heat-sensitive recording material having a color reactant system which comprises (1) a color former, (2) a developer for the color former selected from the group consisting of a metal-free phenolic compound and a zinc thiocyanate complex, and (3) a sulfamide compound of the formula ##STR5## wherein R 1 , R 2 and R 3 are each independently lower alkyl, cyano-lower alkyl, cyclohexyl, phenyl, naphthyl, benzyl or phenethyl, or --NR 2 R 3 is pyrrolidino, piperidino or morpholino.
Claim 2
Dependent Claim
78 words
A heat-sensitive recording material having a color reactant system which comprises (1) a color former, (2) a developer for the color former selected from the group consisting of a metal-free phenolic compound and a zinc thiocyanate complex, and (3) a sulfamide compound of the formula ##STR5## wherein R 1 , R 2 and R 3 are each independently lower alkyl, cyano-lower alkyl, cyclohexyl, phenyl, naphthyl, benzyl or phenethyl, or --NR 2 R 3 is pyrrolidino, piperidino or morpholino.
Claim 3
Dependent Claim
28 words
A recording material of claim 1, wherein R 1 , R 2 and R 3 are each independently lower alkyl, cyano-lower alkyl, cyclohexyl, phenyl, naphthyl, benzyl or phenethyl.
Claim 4
Dependent Claim
13 words
A recording material of claim 1, wherein R 1 is phenyl or naphthyl.
Claim 5
Dependent Claim
23 words
A recording material of claim 1, wherein R 1 is phenyl or naphthyl and R 2 and R 3 are each lower alkyl.
Claim 6
Dependent Claim
15 words
A recording material of claim 4, wherein R 2 and R 3 are each methyl.
Claim 7
Dependent Claim
34 words
A recording material of claim 1, which comprises a support which contains in at least one layer the color former, the developer for said color former, at least one binder, and the sulfamide compound.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |