Additive for the reduction of mottle in photothermographic and thermographic elements
AssigneeMinnesota Mining and Manufacturing Company
InventorsRoger K. Yonkoski, Patricia M. Savu
Life of this patent
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Abstract
A fluorinated polymer comprising at least three different groups within the polymer chain derived from reactive monomers, the monomers comprising: (a) a fluorinated, ethylenically unsaturated monomer; (b) a hydroxyl-containing, ethylenically unsaturated monomer; and (c) a polar, ethylenically unsaturated monomer. The fluorinated polymers provide a surfactant that is particularly useful in the coating of polymeric layers. The surfactants can reduce surface anomalies, such as mottle when used to coat photothermographic and thermographic elements from certain solvent systems. The present invention also provides photothermographic and thermographic elements comprising the foregoing fluorinated polymers.
Claims19
A photothermographic element comprising a substrate coated with a photothermographic composition comprising:
- (a) a photosensitive silver halide;
- (b) a non-photosensitive, reducible source of silver;
- (c) a reducing agent for said non-photosensitive, reducible source of silver;
- (d) a binder;
- and
- (e) a fluorinated polymer consisting essentially of at least three different groups within the polymer chain derived from reactive monomers, the monomers consisting essentially of:
- (i) a fluorinated, ethylenically unsaturated monomer;
- (ii) a hydroxyl-containing, ethylenically unsaturated monomer;
- and
- (iii) a polar, ethylenically unsaturated monomer.
A thermographic element comprising a substrate coated with a thermographic composition comprising:
- (a) a non-photosensitive, reducible source of silver;
- (b) a reducing agent for said non-photosensitive, reducible source of silver;
- (c) a binder;
- and
- (d) a fluorinated polymer consisting essentially of at least three different groups within the polymer chain derived from reactive monomers, the monomers consisting essentially of:
- (i) a fluorinated, ethylenically unsaturated monomer;
- (ii) a hydroxyl-containing, ethylenically unsaturated monomer;
- and
- (iii) a polar, ethylenically unsaturated monomer.
Dependencies are inferred from the claim text.