Patent · US Expired

Transfer of catinic dyes in their deprotonated, electrically neutral form

US4880769A · kind A · utility

20Cited by

3References

4Claims

0Family size

Assignee

BASF SE

Inventors

Johannes P. Dix · Schifferstadt, DE
Karl-Heinz Etzbach · Bischofswerda, DE
Udo Mayer · Bischofswerda, DE
Ruediger Sens · Mannheim, DE

Key dates

Filing date	Dec 18, 1987
Grant date	Nov 14, 1989
Priority date	—
Expiry date	Dec 18, 2007

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S428/914
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

Dyes are transferred from a substrate to an acceptor by sublimation or vaporization of the dye by means of a thermal printing head by using a substrate on which there is situated cationic dyes having a cyanine chromophore and one or more N-H groups which are part of the cyanine chromophore, in their electrically neutral form as the result of deprotonation at the N-H group and transferring these deprotonated dyes to a coated paper.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.