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IMAGING METHOD BASED ON PHOTO-INDUCED DEPOLYMERIZATION OF POLY(ACETALDEHYDE)

IP.com Disclosure Number: IPCOM000022797D
Original Publication Date: 1976-Feb-29
Included in the Prior Art Database: 2004-Mar-26

Publishing Venue

Xerox Disclosure Journal

Abstract

Poly(acetaldehyde) is prepared with photodegradable end~-caps such as phenyl glyoxylate groups. The end~-caps may be destroyed by direct irradiation or by photosensi~ tization with an appropriate sensitizer having a (n,lT *) triplet state whose energy is greater than the triplet energy of phenyl glyoxylate, e.g. benzophenone. Upon destruction of the end~caps, the polymer depolymerizes to the monomeric state which is a gas at ambient tempera~ tures. when the poly(acetaldehyde) is dispersed in a suitable passive matrix, preferably of a thermoplastic resinous material, the depolymerization reaction in the light struck areas results in the liberation of molecular acetaldehyde and the coalescence of these molecules to