Carbonless duplicating and marking systems

Details Carbonless duplicating and marking systems Carbonless duplicating and marking systems

Filed on

1980-03-06

Date issued

1981-12-29

Examiner

Hess, Bruce H.

Patent Class

Textiles: manufacturing

Other Related Categories

427151, 428488, 428537, 428913, 428914, 4283204, 430348, 430964, B41M 516, B41M 518, B41M 522

Type

Patent

Status

active

Patent number

043078982

Description

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.

REFERENCES:
patent: 3637748 (1972-01-01), Psaar et al.
patent: 3684510 (1972-08-01), Psaar et al.
patent: 3957288 (1976-05-01), Lemahieu
patent: 3958815 (1976-05-01), Poot et al.

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