Patent · US Expired

Process for making carbonless copying paper

US4324817A · kind A · utility

8Cited by

1References

5Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Manfred Dahm · Leverkusen, DE
Gert Jabs
Christian Wegner · Cologne, DE

Key dates

Filing date	Jul 23, 1980
Grant date	Apr 13, 1982
Priority date	—
Expiry date	Jul 23, 2000

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31591
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

A "one-component" carbonless copying paper, comprising paper having on the same surface thereof (1) a color former encapsulated in walls of polyurea obtained by the reaction of a polyisocyanate with a polyamine and water, and (2) a developer capable of reacting with the color former to form a dyestuff, the developer having been formed in situ during the reaction of the polyisocyanate with the polyamine.

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