Coating for increasing sensitivity of a radiation imageable polyacetylenic film
AssigneeGAF Chemicals Corporation
InventorsDavid F. Lewis, Robert D. Schenfele
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Abstract
The invention relates to an aqueous coating composition containing a N-alkyl lactam dispersing aid and a water soluble metal salt having an atomic number greater than 50 dispersed in between about 4 and about 50 wt. % of an aqueous binder solution compatible with a binder employed for crystalline polyacetylenic crystals used in an imaging process.
Claims17
The process which comprises overcoating as a discrete overcoat layer the surface of an imageable polyacetylenic layer disposed on an irradiation imageable film with an effective sensitizing amount of the composition comprising between about 0.001% and about 1.0% by weight of an N-alkyl lactam dispersing aid and a metal nitrate, acetate or persulfate salt of a metal having an atomic number of at least 50 or a mixture of said metal salts dispersed in between about 4% and about 50% by weight of an aqueous solution of a binder compatible with the binder of imageable polyacetylene crystals;
- said composition having a weight ratio of metal salt to binder between about 0.4:1 and about 2.5:1.
A radiation imageable film comprising a layer of polyacetylenic microcrystals fixed in a binder overcoated with a discrete surface layer of the dried dispersion comprising between about 0.001% and about 1.0% by weight of an N-alkyl lactam dispersing aid and a metal nitrate, acetate or persulfate salt of a metal having an atomic number of at least 50 or a mixture of said metal salts dispersed in between about 4% and about 50% by weight of an aqueous solution of a binder compatible with the binder of imageable polyacetylene crystals;
- said composition having a weight ratio of metal salt to binder between about 0.4:1 and about 2.5:1.
Dependencies are inferred from the claim text.