Patent · US Expired

Pressure sensitive copying material

US4372581A · kind A · utility

1Cited by

4References

10Claims

0Family size

Inventors

Hermann Schumacher · Reutlingen, DE
Tilman Molineus · Wülfrath, DE
Detlef Ridder · Essen, DE

Key dates

Filing date	Oct 20, 1980
Grant date	Feb 8, 1983
Priority date	—
Expiry date	Oct 20, 2000

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31935
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

A pressure sensitive copying element in the form of a web having on one side a color forming coating containing a mixture of alkanes of m.w. 500-3500 and dispersed therein 0.1 to 10% by weight of an incompatible material which is a cellulose derivative, hydrocarbon resin, melamine resin, phenolic resin, or styrene resin, and a solution of a color former in a solvent compatible with the material but incompatible with the alkanes. On the other side there may be a color developing coating containing aluminium oxide together with a binder.

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