Image receiver elements with aqueous dye receiving layer
View Patent ↗A thermal, non-silver halide-containing image receiver element includes a support and an aqueous-coated image receiving layer. This receiving layer comprises a water-dispersible polymer having a polyurea or polyurethane backbone and up to 25 weight % of the water-dispersible polymer comprising polysiloxane side chains that are covalently attached to the backbone, each of the side chains having a molecular weight of at least 500. Aqueous dispersions of polyester ionomers and crosslinking agents can also be present.
1. A thermal, non-silver halide-containing image receiver element comprising a support and having thereon an aqueous-coated image receiving layer comprising:
a) a water-dispersible polymer having a polyurea or polyurethane backbone and up to 25 weight % of the water-dispersible polymer comprising polysiloxane side chains that are covalently attached to the backbone, each of the side chains having a molecular weight of at least 500.
2. The element of claim 1 wherein the image receiving layer further comprises:
b) a crosslinkable water-dispersible polyester ionomer having a Tg of at least 0 and up to and including 100° C., and
c) a crosslinking agent for the polyester ionomer.
3. The element of claim 2 wherein the water-dispersible polymer is present in an amount of at least 1 and up to and including 95 weight %, the polyester ionomer is present in an amount of at least 1 and up to and including 95 weight %, and the crosslinking agent is present in an amount of at least 0.1 and up to and including 20 weight %, all based on total image receiving layer dry weight.
4. The element of claim 2 wherein the weight ratio of the water-dispersible polymer to the polyester ionomer is at least 0.01:1 and up to and including 99:1.
5. The element of claim 2 wherein the polyester ionomer has a Tg of at least 20 and up to and including 80° C. and comprises recurring units comprising anionic moieties.
6. The element of claim 1 wherein the polysiloxane side chains are derived from a siloxane-containing diol or diamine and is represented by the following Structure (SX-1):
wherein X is an amino or hydroxyl group, R 1 through R 12 are independently alkyl or aryl groups, and n and m are independently 0 to 500 such that the sum of n and m is at least 10 and up to and including 500.
7. The element of claim 1 wherein the polysiloxane side chains comprise at least 5 and up to and including 20 weight % of the water-dispersible polymer.
8. The element of claim 1 wherein the image receiving layer is the outermost layer.
9. The element of claim 1 further comprising an outermost layer disposed on the image receiving layer, which outermost layer has a dry thickness of at least 0.1 and up to and including 1 μm.
10. The element of claim 1 further comprising one or more additional layers between the support and the image receiving layer, at least one of said additional layers comprising an antistatic agent.
11. The element of claim 1 wherein the image receiving layer further comprises an antistatic agent.
12. The element of claim 1 that is a thermal dye image receiver element.
13. The element of claim 12 wherein the image receiving layer is a thermal dye image receiving layer and the support is composed of a cellulosic raw paper base or synthetic paper base.
14. The element of claim 13 comprising, in order, the thermal dye image receiving layer, an antistatic tie layer, a compliant layer or microvoided film, and the support.
15. The element of claim 14 wherein the compliant layer is an extruded layer and the element further comprises a skin layer immediately adjacent one or both sides of the compliant layer.
16. An imaging assembly comprising the image receiver element of claim 1 in thermal association with a thermal dye donor element.
17. The imaging assembly of claim 16 wherein the image receiving layer of the image receiver element further comprises:
b) a crosslinkable water-dispersible polyester ionomer, and
c) a crosslinking agent for the polyester ionomer,
the water-dispersible polymer is present in an amount of at least 1 and up to and including 95 weight %, the polyester ionomer is present in an amount of at least 1 and up to and including 95 weight %, and the crosslinking agent is present in an amount of at least 0.01 and up to and including 20 weight %, all based on total image receiving layer dry weight,
the weight ratio of the water-dispersible polymer to the polyester ionomer is at least 0.01:1 and up to and including 99:1, and
the polysiloxane side chains are derived from a siloxane-containing diol or diamine and is represented by the following Structure (SX-1):
wherein X is an amino or hydroxyl group, R 1 through R 12 are independently alkyl or aryl groups, and n and m are independently 0 to 500 such that the sum of n and m is at least 10 and up to and including 500.