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Microbeam and unmixed polyester for thermal imaging media

A technology of polymer particles, polyester, used in transportation and packaging, thermography, coating, etc., can solve problems such as inability to provide solutions, tearing, poor contact of inorganic pore initiator dye-donor elements, etc. Achieve improved image quality, reduced production costs, and improved grain appearance

Inactive Publication Date: 2004-07-07
EASTMAN KODAK CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a problem with such supports is that in order to obtain the high void levels required for the desired dye transfer efficiency, the volumetric loading of the microbeads needs to be greater than 25% of the volume of the polymeric matrix
However, a problem with this support is that the hardness of the inorganic porosity initiator results in poor contact with the dye-donor element
However the problem with US patent application 10 / 033,481 is that the support must be multilayered and when trying to produce it as a single layer support the top porous layer tears apart
Therefore, the use of immiscible polymer particles does not by itself provide a solution to the problems observed with microbeads described above

Method used

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  • Microbeam and unmixed polyester for thermal imaging media
  • Microbeam and unmixed polyester for thermal imaging media
  • Microbeam and unmixed polyester for thermal imaging media

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] Example 1 - Porous layer prepared from cross-linked microbeads only (comparative)

[0111] A monolayer film comprising an apertured polyester layer was prepared by the method described below. The material used to make the film was a complex mixture consisting of 35 wt% PETG 6763 resin (IV = 0.73 dl / g) (amorphous polyester resin commercially available from Eastman Chemical Co.), 35 wt% polyparaphenylene Ethylene glycol diformate (commercially available as PET #7352 from Eastman Chemicals) and 30 wt% cross-linked spherical polymethyl methacrylate, (PMMA), 1.7 μm diameter beads. Cross-linked organic beads were prepared by the previously described method of limited coalescence. The beaded poly(methyl methacrylate) was compounded with the polyester resin by mixing in a counter-rotating twin-screw extruder connected to a pelletizing die that formed pellets of the resin mixture.

[0112] The obtained resin was dried at 65°C. The resin melts at 275°C and is fed through a m...

Embodiment 2

[0114] Example 2 - Preparation of a porous layer using only non-crosslinked polymer particles immiscible with the polyester matrix (comparative)

[0115] A monolayer film comprising an absorbent polyester layer was prepared by the method hereinafter described. Polyethylene terephthalate (commercially available as PET #7352 from Eastman Chemicals) was dry blended with 20% by weight polypropylene ("PP", Huntsman P4G2Z-073AX), based on the total weight of the mixture, and at 65 C in a desiccator for 12 hours.

[0116] The resin is then melted at 275°C and fed through a masticating screw extruder into the extrusion die manifold to create a melt stream that exits the die and is rapidly quenched on chill rolls . By controlling the throughput of the extruder, the thickness of the final cast sheet can be adjusted. In this case, the thickness of the cast sheet was about 420 μm. The cast sheet was first oriented in the machine direction at a draw ratio of 3.3 and a temperature of ...

Embodiment 3

[0117] Embodiment 3 (invention)

[0118] Monolayer films comprising a voided polyester matrix layer were prepared using the method described below. The material used to make the film was a complex mixture consisting of: 35 wt% PETG 6763 resin resin (IV = 0.73 dl / g) (amorphous polyester resin commercially available from Eastman Chemical Company), 35 wt% polyparaffin Ethylene phthalate (commercially available as PET #7352 from Eastman Chemicals) and 30 wt% cross-linked spherical polymethyl methacrylate (PMMA), 1.7 μm diameter cross-linked organic beads. Cross-linked organic beads were prepared by the previously described method of limited coalescence. The beaded polymethyl methacrylate was compounded with PETG resin by mixing in a counter-rotating twin-screw extruder attached with pelletizing dies forming pellets of the resin mixture. Then, 20 wt% of polypropylene ("PP", Huntsman P4G2Z-073AX) was dry blended with polyethylene terephthalate (PET #7352 commercially available f...

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Abstract

The present invention relates to a thermal image recording element comprising a microvoided layer comprising a continuous phase polyester matrix having dispersed therein crosslinked organic microbeads and non-crosslinked polymer particles that are immiscible with the polyester matrix of the microvoided layer.

Description

technical field [0001] This invention relates to apertured films for use in thermographic media comprising microbeads and non-crosslinked polymer particles immiscible with a polyester matrix. Background technique [0002] The recording element or medium typically comprises a substrate or carrier material optionally having an imaging layer on at least one surface thereof. The elements include those intended for reflection viewing, which generally contain an opaque support, and those intended for observation by transmitted light, which generally contain a transparent support. [0003] Although many different types of image recording elements have been disclosed, there are many unsolved problems in the art and deficiencies in known products which severely limit their commercial use. These disadvantages vary with the type of image recording element. [0004] A number of approaches have been proposed to improve the imaging quality of dye image receiving layers in thermal dye tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41M5/382B41M5/41B41M5/50B41M5/52
CPCB41M5/41B41M5/5272Y10T428/254Y10T428/31786Y10T428/249987Y10T428/249953
Inventor T·M·莱尼T·-M·龚
Owner EASTMAN KODAK CO
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