Patent · US Expired

Distortion resistant polyester support for use as a phototool

US4645731A · kind A · utility

13Cited by

7References

10Claims

0Family size

Assignee

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

Inventors

John H. Bayless · Hendersonville, US
Neil I. Steinberg · Greer, US
James H. Thirtle · Rochester, US

Key dates

Filing date	Dec 27, 1985
Grant date	Feb 24, 1987
Priority date	—
Expiry date	Dec 27, 2005

Classification

Technology area (CPC G)Physics
CPC primaryG03C1/795
WIPO fieldOptics
WIPO sectorInstruments

Abstract

Photosensitive element comprising a polyester, e.g., polyethylene terephthalate, at least 0.008 inch (0.20 mm) thick bearing on both sides a polymeric water-vapor barrier layer at least 0.00001 inch (0.00025 mm) thick of a copolymer of vinylidene chloride containing at least 80% by weight of vinylidene chloride and minor amounts of alkyl acrylate, and itaconic acid, and on at least one side of said barrier layer, a layer of a photosensitive material, e.g., silver halide emulsion, diazo or photopolymer. The element in the form of a phototool limits dimensional change within 6 hours after exposure to a 5% Relative Humidity change to no more than 0.001 inch (0.025 mm) per 24 inches (60.96 cm).

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