Gaf Corporation

Gaf Chemicals Corporation

Steward E Purdy

David F Lewis

Mark L Moskowitz

Recording medium of improved stability

This invention concerns a process of mixing a dispersion comprising a substantially crystalline, image receptive polyacetylenic compound in an aqueous non-solvating binder solutions with an effective ripening amount of an organic liquid boiling above 30.degree. C. which is completely miscible with water at least in a proportion of 1:2 part per parts and in which said polyacetylene is soluble for a time and at an elevated temperature sufficient to effect crystalline growth and improved sensitivity to imaging by exposure to a source of radiation.

Process for sensitizing polyacetylenic films

The process for improving radiant energy sensitivity of a film base coated with a dispersion of a normally crystalline polyacetylenic compound in a non-solvating liquid which is dried on the film surface; said polyacetylenic compound preferably having at least two conjugated acetylenic linkages and containing from 20 to 60 carbon atoms. The process comprises dispersing said normally crystalline polyacetylenic compound in the non-solvating liquid to a concentration of from about 2 to about 50% polyacetylene crystalline solids and ageing said dispersion by (a) storing at a temperature of between about 0.degree. C. and about 12.degree. C. for a period of from about 1 to about 30 days or (b) freezing said dispersion at a temperature between about -78.degree. C. and about -1.degree. C. for a period of from about 1 to about 75 hours or (c) a combination of the above ageing techniques any or all of which are completed before drying said dispersion on a substrate.

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Binghamton, NY, United States of America

Steward E Purdy