Carbonless duplicating and marking systems
AssigneeSterling Drug Inc.
InventorsPaul J. Schmidt, William M. Hung
Life of this patent
Estimating the term…
Abstract
3-[(Alkoxy)(aryl or heteroaryl)methyl]-1H-indoles which are useful as color formers in pressure-sensitive carbonless duplicating systems and thermal marking systems are prepared by reacting 3-[(arylsulfonyl)(aryl or heteroaryl)methyl]-1H-indoles with alcohols in the presence of a base.
Claims5
A pressure-sensitive carbonless duplicating system or thermal marking system containing a support sheet coated with a color-forming substance comprising a compound having the formula ##STR15## wherein:
- R.sub.1 is hydrogen or lower-alkyl;
- R.sub.2 is hydrogen, lower-alkyl or phenyl;
- R.sub.3 is alkyl containing 1 to 8 carbon atoms, dilower-alkylamino-lower-alkyl, tri-lower-alkylammonium-lower-alkyl, benzyl or benzyl substituted in the phenyl ring with 1 or 2 lower-alkyl or lower-alkoxy groups, or R.sub.3 is a substituent having the formula ##STR16## and Z is biphenylyl, naphthyl or a substituent having the formula ##STR17## wherein R.sub.4 and R.sub.5 are independently lower-alkyl or benzyl, and
- R.sub.6 is hydrogen, lower-alkyl, lower-alkoxy, halo or di-lower-alkylamino.
A pressure-sensitive carbonless duplicating system or thermal marking system containing a support sheet coated with a color-forming substance comprising a compound having the formula ##STR19## wherein:
- R.sub.1 is hydrogen or lower-alkyl;
- R.sub.2 is hydrogen, lower-alkyl or phenyl;
- R.sub.3 is di-lower-alkylamino-lower-alkyl or tri-lower-alkylammonium-lower-alkyl;
- and
- Z is phenyl, tolyl or lower-alkoxyphenyl.
A pressure-sensitive carbonless duplicating system or thermal marking system containing a support sheet coated with a color-forming substance comprising a compound selected from the group consisting of
- 3-[(4-methoxyphenyl)(4-methoxybenzyloxy)methyl]-2-methyl-1H-indole;
- 3-[(4-methoxyphenyl)(benzyloxy)methyl]-2-methyl-1H-indole;
- 3-[(3,4-dimethoxyphenyl)(methoxy)methyl]-2-methyl-1H-indole;
- 3-[(methoxy)(1-methyl-2-pyrrolyl)methyl-1-ethyl-2-methyl-1H-indole;
- 3-[(9-ethyl-3-carbazolyl)(methoxy)methyl]-2-methyl-1H-indole;
- and
- 3-[(methoxy)(2-pyridyl)methyl]-2-methyl-1H-indole.
A pressure-sensitive carbonless duplicating system or thermal marking system containing a support sheet coated with a color-forming substance comprising a compound selected from the group consisting of:
- 3-[(methoxy)(p-tolyl)methyl]-1H-indole;
- 3-[(methoxy)(4-methoxyphenyl)methyl]-1H-indole;
- 3-[(2-propoxy)(4-methoxyphenyl)methyl]-2-methyl-1H-indole;
- 3-[(n-butoxy)(4-methoxyphenyl)methyl]-2-methyl-1H-indole;
- 3-[(methoxy)(2-methoxyphenyl)methyl]-2-methyl-1H-indole;
- 3-[(3,4-dichlorophenyl)(methoxy)methyl]-2-methyl-1H-indole;
- 3-[(2-furyl)(methoxy)methyl]-1-ethyl-2-methyl-1H-indole;
- 3-[(methoxy)(2-thienyl)methyl]-1H-indole;
- 3-[(methoxy)(2-thienyl)methyl]-2-methyl-1H-indole;
- 3-[(methoxy)(2-thienyl)methyl]-1-ethyl-2-methyl-1H-indole;
- 3-[(n-butoxy)(2-thienyl)methyl]-2-methyl-1H-indole;
- and
- 3-[(1-ethyl-2-methyl-1H-indole-3-yl)(methoxy)methyl]-1-ethyl-2-methyl-1H-in dole.
Dependencies are inferred from the claim text.