Direct thermographic materials with improved protective layers
AssigneeEastman Kodak Company
InventorsRaymond J. Kenney, David G. Foster, David A. Johnson
Life of this patent
Estimating the term…
Abstract
Non-photosensitive direct thermographic materials have a support and thermally sensitive imaging layer(s) and an outermost “protective” layer comprising: (a) a solid polymer derived from one or more olefins and from one or more ethylenically unsaturated polymerizable carboxylic acids or esters or anhydrides thereof, and (b) a branched α-olefin polymer, and (c) optionally, an additional wax.
Claims25
A non-photosensitive direct thermographic material comprising a support and on one or both sides thereof, one or more thermally sensitive imaging layers and an outermost non-thermally sensitive protective layer disposed over said one or more thermally sensitive imaging layers,
- said one or more thermally sensitive layers having in reactive association, a non-photosensitive source of reducible silver ions and a reducing agent for said reducible silver ions, and
- said outermost protective layer comprising:
- (a) a solid polymer derived from one or more olefins and from one or more ethylenically unsaturated polymerizable carboxylic acids or esters or anhydrides thereof, and
- (b) a branched α-olefin polymer, and
- (c) optionally, an additional wax,
- wherein the total amount of component (a), component (b), and optionally component (c) is from about 0.1 to about 2.5 g/m2.
A black-and-white, non-photosensitive direct thermographic material that comprises a transparent polymer support having on only one side thereof one or more thermally sensitive imaging layers and an outermost non-thermally sensitive protective layer over said one or more thermally sensitive imaging layers,
- said one or more thermally sensitive imaging layers comprising predominantly one or more hydrophobic binders, and in reactive association, a non-photosensitive source of reducible silver ions that includes one or more silver aliphatic carboxylates at least one of which is silver behenate, a reducing agent for said non-photosensitive source reducible silver ions comprising an aromatic di- and tri-hydroxy compound having at least two hydroxy groups in ortho- or para-relationship on the same aromatic nucleus or mixture thereof, and
- a conductive layer on the opposite side of said support,
- said outermost protective layer comprising a matting agent in an amount of from about 1 to about 10 weight % of the total dry weight of said outermost protective layer, and said outermost protective layer further comprising all three of the following components (a), (b), and (c):
- (a) a polyolefin solid polymer having a molecular weight of about 700, an acid number of 160, a saponification number of 212, a penetration index at 25° C. of 3, a melting point of 78° C., and that is the reaction product of α-olefin with maleic anhydride and mono-isopropyl maleate,
- (b) a branched α-olefin polymer having a number average molecular weight of about 4400, a softening point of 74IC, and
- (c) a linear polyethylene wax having a weight average molecular weight of about 450 and a melting point of 81° C.,
- wherein the weight ratio of component (a) to component (b) is from about 1:2 to about 2:1, the weight ratio of said component (a) to component (c) is from about 1:2 to about 2:1, and the weight ratio of component (b) to component (c) is from about 1:2 to about 2:1, and
- component (a) is present in an amount of from about 0.01 to about 1 g/m2.
Dependencies are inferred from the claim text.