Optical member and polymer layer

Patent metadata

Field	Value
Publication number	US-10947411-B2
Application number	US-201616061474-A
Country	US
Kind code	B2
Filing date	Dec 8, 2016
Priority date	Dec 15, 2015
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

The optical member of the present invention includes a substrate and a polymer layer that is in direct contact with the substrate and includes on a surface thereof an uneven structure provided with multiple projections at a pitch not longer than a wavelength of visible light, the polymer layer containing an amide group, the polymer layer having an amide group concentration of 2 mmol/g or higher and lower than 5 mmol/g, the polymer layer having a minimum storage modulus E′ of 1×10 8 Pa or higher and 1×10 9 Pa or lower at a bottom temperature of 110° C. or higher and 210° C. or lower in a dynamic viscoelasticity measurement with a measurement temperature range of −50° C. to 250° C., a temperature rise rate of 5° C./min, and a frequency of 10 Hz.

First claim

The invention claimed is:

1. An optical member comprising
a substrate and
a polymer layer that is in direct contact with the substrate and includes on a surface thereof an uneven structure provided with multiple projections at a pitch not longer than a wavelength of visible light,
the polymer layer containing an amide group,
the polymer layer having an amide group concentration of 2 mmol/g or higher and lower than 5 mmol/g,
the polymer layer having a minimum storage modulus E′ of 1×10 8 Pa or higher and 1×10 9 Pa or lower at a bottom temperature of 110° C. or higher and 210° C. or lower in a dynamic viscoelasticity measurement with a measurement temperature range of −50° C. to 250° C., a temperature rise rate of 5° C./min, and a frequency of 10 Hz.

2. The optical member according to claim 1 ,
wherein the polymer layer has an amide group concentration of 2.5 mmol/g or higher and lower than 4.5 mmol/g.

3. The optical member according to claim 2 ,
wherein the polymer layer has an amide group concentration of 3 mmol/g or higher and lower than 4 mmol/g.

4. The optical member according to claim 1 ,
wherein the bottom temperature is 125° C. or higher and 195° C. or lower and the minimum storage modulus E′ is 1.5×10 8 Pa or higher and 9×10 8 Pa or lower.

5. The optical member according to claim 4 ,
wherein the bottom temperature is 140° C. or higher and 180° C. or lower and the minimum storage modulus E′ is 2×10 8 Pa or higher and 8×10 8 Pa or lower.

6. The optical member according to claim 1 ,
wherein the polymer layer is a cured product of a (meth)acrylic polymerizable composition, and
the (meth)acrylic polymerizable composition contains 20 parts by weight or more and 49 parts by weight or less of a monofunctional amide monomer and 0.1 parts by weight or more and 10 parts by weight or less of a fluorine-containing compound.

7. The optical member according to claim 6 ,
wherein the (meth)acrylic polymerizable composition contains 0.5 parts by weight or more and 8 parts by weight or less of the fluorine-containing compound.

8. The optical member according to claim 7 ,
wherein the (meth)acrylic polymerizable composition contains 1 part by weight or more and 5 parts by weight or less of the fluorine-containing compound.

9. The optical member according to claim 6 ,
wherein the (meth)acrylic polymerizable composition is solvent-free.

10. The optical member according to claim 6 ,
wherein the monofunctional amide monomer contains at least one of N,N-dimethylacrylamide and N,N-diethylacrylamide.

11. The optical member according to claim 1 ,
wherein the substrate contains triacetyl cellulose at least on a surface thereof adjacent to the polymer layer.

12. A polymer layer comprising, on a surface thereof, an uneven structure provided with multiple projections at a pitch not longer than a wavelength of visible light,
the polymer layer containing an amide group at a concentration of 2 mmol/g or higher and lower than 5 mmol/g,
the polymer layer having a minimum storage modulus E′ of 1×10 8 Pa or higher and 1×10 9 Pa or lower at a bottom temperature of 110° C. or higher and 210° C. or lower in a dynamic viscoelasticity measurement with a measurement temperature range of −50° C. to 250° C., a temperature rise rate of 5° C./min, and a frequency of 10 Hz.

Assignees

• Sharp Kk

Inventors

• Shibai Yasuhiro
• ATSUMO Ken
• Hayashi Hidekazu
• Yamada Nobuaki

Classifications

• B29C59/02

  by mechanical means, e.g. pressing {(B29C59/007 takes precedence; embossing expanded porous articles B29C44/5627)} · CPC title

• C09J151/08

  grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• C08F290/147

  Polyurethanes; Polyureas · CPC title

• C09D177/06 Primary

  Polyamides derived from polyamines and polycarboxylic acids (C09D177/10 takes precedence) · CPC title

• B32B3/30

  characterised by a layer formed with recesses or projections, e.g. {hollows, grooves, protuberances, ribs (apertured layer B32B3/266; layer with cavities or internal voids B32B3/26)} · CPC title