Sensitizers for photocrosslinkable polymers
AssigneeEastman Kodak Company
InventorsJames Albert Van Allan, Michael Paul Cunningham, Donald Paul Specht, Samir Yacoub Farid
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Abstract
Merocyanine dyes comprising 2-(heterocyclylcarbonylmethylene)thiazolines and selenazolines and 2-[di(heterocyclylcarbonyl)methylene]thiazolines and selenazolines are efficient sensitizers for light-sensitive unsaturated materials such as unsaturated vesiculators which release a gas upon exposure to radiation, photocrosslinkable unsaturated polymers, and azides such as photocrosslinkable polymeric azides used in photomechanical resists and lithographic plates.
Claims15
In a photosensitive composition comprising a photocrosslinkable azide polymer and a sensitizer in an amount sufficient to sensitize said polymer;
- the improvement wherein said sensitizer has the following formula:
- ##STR46## wherein X is a sulfur or a selenium atom;
- R.sup.1, R.sup.2, R.sup.3, and R.sup.4 independently represent hydrogen, lower alkoxy of 1 to 4 carbon atoms or taken together R.sup.1 and R.sup.2, R.sup.2 and R.sup.3, R.sup.3 and R.sup.4 constitute the atoms needed to complete a fused benzo ring;
- R.sup.5 represents lower alkyl of 1 to 4 carbon atoms;
- R.sup.6 represents ##STR47## where R.sup.8 is furyl or thienyl;
- R.sup.7 is furyl or thienyl.
In a photosensitive composition comprising
- a photocrosslinkable azide polymer;
- and a sensitizer in an amount sufficient to sensitize said polymer;
- the improvement wherein said sensitizer is a 2-[di(heterocyclylcarbonyl)methylene]thiazoline or selenazoline having its absorptive maximum between about 340 and about 460 nm.
In a photographic element comprising
- a support having thereon a photosensitive composition comprising a photocrosslinkable azide polymer;
- and a sensitizer in an amount sufficient to sensitize said polymer;
- the improvement wherein said sensitizer is a 2-[di(heterocyclylcarbonyl)methylene]thiazoline or selenazoline having its absorptive maximum between about 340 to about 460 nm.
In a photographic element comprising a support having thereon a photosensitive composition comprising a photocrosslinkable azide polymer and a sensitizer in an amount sufficient to sensitize said polymer;
- the improvement wherein said sensitizer has the following formula:
- ##STR48## wherein X is a sulfur or a selenium atom;
- R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently represent hydrogen, lower alkoxy of 1 to 4 carbon atoms or taken together R.sup.1 and R.sup.2, R.sup.2 and R.sup.3, R.sup.3 and R.sup.4 constitute the atoms needed to complete a fused benzo ring;
- R.sup.5 represents lower alkyl of 1 to 4 carbon atoms;
- R.sup.6 represents ##STR49## where R.sup.8 is furyl or thienyl;
- R.sup.7 is furyl or thienyl.
Dependencies are inferred from the claim text.