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| Porous silicon dioxide insulator |
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| Method for forming porous silicon dioxide insulators and related structures |
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| Method for making surfactant-templated, high-porosity thin films |
| OF THE INVENTION The present invention provides a method to prepare high-porosity, mesophase ... |
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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 |
| OF THE INVENTION As used throughout this specification, the following abbreviations shall have the ... |
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| Process for producing nanoporous dielectric films at high pH |
| OF THE PREFERRED EMBODIMENT The invention forms a reaction product of at least one alkoxysilane ... |
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| Process for producing dielectric thin films |
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Modified copolyesters and improved multilayer reflective films
| Details |
Inventors: Hebrink, Timothy J.; Merrill, William W.; Stover, Carl A.;
Assignee: 3M Innovative Properties Company (St. Paul, MN)
Primary Examiner: Chen; Vivian
Assistant Examiner:
Attorney, Agent or Firm: Black; Bruce E.
A multilayered polymer film includes a first set of optical layers and a second set of optical layers. The first set of optical layers is made from a polyester which is often birefringent. The polyesters of the first set of optical layers typically have a composition in which 70-100 mol % of the carboxylate subunits are first carboxylate subunits and 0-30 mol % are comonomer carboxylate subunits and 70 to 100 mol % of the glycol subunits are first glycol subunits and 0 to 30 mol % of the glycol subunits are comonomer glycol subunits, where at least 0.5 mol % of the combined carboxylate and glycol subunits are comonomer carboxylate or comonomer glycol subunits. The second set of optical layers comprise copolyesters wherein 0.01 to 2.5 mol % of the combined carboxylate and glycol subunits are carboxylate subunits derived from compounds having three or more carboxylate or ester functionalities, glycol subunits derived from compounds having three or more hydroxyl functionalities, or combinations thereof. The multilayered polymer film may be used to form, for example, a reflective polarizer or a mirror. |
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DETAILED DESCRIPTION Generally, the present invention relates to a multilayered polymer film.
One embodiment is a multilayered polymer film which includes a plurality of first layers and a plurality of second layers.
The first layers are made with a first copolyester which is semicrystalline and birefringent.
The first copolyester includes carboxylate subunits and glycol subunits in which 70 to 100 mol % of the carboxylate subunits are first carboxylate subunits, 0 to 30 mol % of the carboxylate subunits are first comonomer carboxylate subunits, 70 to 100 mol % of the glycol subunits are first glycol subunits, and 0 to 30 mol % of the glycol subunits are first comonomer glycol subunits, and at least 2.
5 mol % of the combined carboxylate and glycol subunits of the first copolyester are first comonomer carboxylate subunits, first comonomer glycol subunits, or a combination thereof.
The second layers are made with a second polymer which has an in-plane birefringence of about 0.
04 or less, at 632.
8 nm, after the multilayered polymer film has been formed.
Another embodiment is a multilayered polymer film having a plurality of first layers and a plurality of second layers.
The first layers are made with a first copolyester which is semicrystalline and birefringent.
The first copolyester includes carboxylate subunits and glycol subunits in which 70 to 100 mol % of the carboxylate subunits are first carboxylate subunits, 0 to 30 mol % of the carboxylate subunits are first comonomer carboxylate subunits, 70 to 100 mol % of the glycol subunits are first glycol subunits, 0 to 30 mol % of the glycol subunits are first comonomer glycol subunits, and at least 0.
5 mol % of the combined carboxylate and glycol subunits of the first copolyester are first comonomer carboxylate subunits, first comonomer glycol subunits, or a combination thereof.
The first copolyester has in-plane indices of refraction which are 1.
83 or less and which differ by 0.
2 or greater when measured with 632.
8 nm light.
The second layers are made with a second polymer which has an in-plane birefringence of about 0
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Nonmetallic Processes 
