Patent · US Expired

Positive-working photosensitive electrostatic master

US5120629A · kind A · utility

16Cited by

11References

22Claims

0Family size

Assignee

E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

Richard Bauer · Estacada, US
Catherine T. Chang · Wilmington, US

Key dates

Filing date	Apr 10, 1990
Grant date	Jun 9, 1992
Priority date	—
Expiry date	Apr 10, 2010

Classification

Technology area (CPC H)Electricity
CPC primaryH05K3/3452
WIPO fieldOptics
WIPO sectorInstruments

Abstract

High resolution photosensitive electrostatic master which forms conductive exposed image areas upon imagewise exposure comprising an electrically conductive substrate bearing a photosensitive layer consisting essentially of at least one acid labile compound which decomposes to form acid, and a photoinitiator or photoinitiating system which upon exposure generates a catalytic amount of a strong acid. A xeroprinting process from producing positive images in said photosensitive layer of the master is also disclosed. The master is useful in the graphic arts field. e.g., making color proofs, preparation of printing circuit boards, resists, solder masks, etc.

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