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| Porous silicon oxycarbide integrated circuit insulator |
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| Method of forming porous film and material for porous film |
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| Porous materials |
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| Process for producing nanoporous dielectric films at high pH |
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| Process for producing dielectric thin films |
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| Particles and a process for preparing the same |
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Embossable thermoplastic polyester film and method for producing the film
| Details |
Inventors: Fitch, John; Moritz, Jan; Chicarella, Jr., Gianfranco; Shimizu, Yuji; Nishigaki, Yasuo; Adams, Bonnie; Fatica, Michael G.; Sargeant, Steven J.;
Assignee: Toray Plastics (America), Inc. (Rhode Island)
Primary Examiner: Chen; Vivian
Assistant Examiner:
Attorney, Agent or Firm: Piper Rudnick LLP
A directly embossable, coated polyethyleneterephthalate film including a dry, uniaxially oriented PET film, and a coating applied to the PET film, wherein the coating and the PET film have as a composite been transversely stretched, the coating resin being capable of impregnating the PET surface on drawing, rendering the film surface susceptible to embossing under pressure and the coating having low heat sealability and a method of producing a coated, directly embossable polyethyleneterephthalate film. |
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DETAILED DESCRIPTION We discovered a method to render the PET embossable via the incorporation of a unique surface coating.
This coating can be applied to PET film during the film making process and renders the PET film, itself, embossable by impregnating the PET and softening the upper layer of the film structure.
The composite structure is then embossable without the need for a secondary coating step.
Furthermore, this material maintains its embossability without acting as an easy heat-sealable material.
Such properties are advantageous for low cost production of holographic images.
We also discovered that embossability of an inline coated polyester film is enhanced by utilizing a smooth surface material and/or optionally a co-extruded co-polyester surface layer as the coating surface.
Such a base sheet polyester can be prepared with equipment and materials well known in the art.
Through the combination of a co-extruded film structure and utilizing the inline embossable film coating, an embossable thermoplastic sheet has been discovered with enhanced image properties, namely reduced granularity or graininess of the embossed image.
Turning now to the Drawing, a preferred method for producing a film in accordance with aspects of the invention will be described.
The polyester base sheet can be prepared via the utilization of a co-extrusion, casting and sequential stretching apparatus.
An extruder 2 can be used to produce the bulk of the polyester sheet, sometimes referred to as the core layer.
Onto the surface of the core layer another layer may be deposited through the use of a secondary extruder 1.
These extruders preferably feed a melt pump system 3 and 4 to keep the output of the layers constant and not substantially influenced by viscosity changes of the molten polymer.
Also, preferably, before laminating the melt streams, the molten polymer is filtered through fritted filter steel 5.
Each molten polymer stream is separated through this part of the process.
After filtering, the molten polymer streams are laminated together to form a continuous stream of molten polymer in a feedblock assembly and die 6
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Nonmetallic Processes 
