Filling-bonding material, protective sheet-equipped filling-bonding material, laminated body, optical device, and protective panel for optical device

Patent metadata

Field	Value
Publication number	US-11203182-B2
Application number	US-201816330180-A
Country	US
Kind code	B2
Filing date	Jan 16, 2018
Priority date	Jan 17, 2017
Publication date	Dec 21, 2021
Grant date	Dec 21, 2021

Abstract

The present invention aims to provide a filling-bonding material that is suitably used to fill a space between parts, while bonding the parts, in optical devices in various shapes not limited to flat shapes. The present invention also aims to provide a protective sheet-equipped filling-bonding material, a laminate, an optical device, and a protective panel for an optical device each including the filling-bonding material. Provided is a filling-bonding material having a shape with an uneven thickness.

First claim

The invention claimed is:

1. A self-supporting filling-bonding material having a shape with an uneven thickness,
wherein a width of the filling-bonding material has a value of 50 mm or greater,
wherein the uneven thickness being defined between a curved surface and an opposing surface, wherein the curved surface has a principal curvature of 1/1000 mm −1 or more and has a positive or negative Gaussian curvature, and
wherein the filling-bonding material has a light-transmitting portion, wherein the light transmitting portion has an average residual phase difference (R ave ) of 20 nm/mm or less and/or an in-plane standard deviation (s) of a phase difference of 10 nm or less.

2. The filling-bonding material according to claim 1 ,
wherein the light transmitting portion has a visible light transmittance of 80% or higher and a haze of 1% or lower.

3. The filling-bonding material according to claim 1 ,
wherein the opposing surface is a flat surface.

4. The filling-bonding material according to claim 1 ,
wherein a thickest part of the filling-bonding material comprises a thickness of 500 μm or greater.

5. The filling-bonding material according to claim 1 ,
wherein the curved surface has a chord length of 50 mm or longer.

6. The filling-bonding material according to claim 1 , having a glass transition temperature (Tg) of 10° C. or higher and 60° C. or lower.

7. The filling-bonding material according to claim 1 , having a storage modulus at 20° C. of 1×10 4 Pa or greater and 1×10 10 Pa or lower.

8. The filling-bonding material according to claim 1 , comprising a polyvinyl acetal.

9. The filling-bonding material according to claim 1 , further comprising a light-shielding portion or a light-scattering portion.

10. The filling-bonding material according to claim 9 ,
wherein the light-shielding portion has a visible light transmittance of 10% or lower.

11. The filling-bonding material according to claim 9 ,
wherein the light-scattering portion has a haze of 10% or higher.

12. The filling-bonding material according to claim 9 , wherein the light-shielding portion or the light-scattering portion contains a dye or a pigment.

13. The filling-bonding material according to claim 9 , wherein the light-shielding portion or the light-scattering portion is positioned at a periphery of the filling-bonding material.

14. A protective sheet-equipped filling-bonding material comprising:
the filling-bonding material according to claim 1 ; and
a protective sheet covering the filling-bonding material.

15. A laminate comprising:
a pair of bonded parts; and
the filling-bonding material according to claim 1 ,
the filling-bonding material filling a space between the pair of bonded parts.

16. An optical device comprising the laminate according to claim 15 ,
the pair of bonded parts including at least one transparent part,
the transparent part and the filling-bonding material having a difference in refractive index of 0.03 or less.

17. A protective panel for an optical device comprising:
a first panel;
a second panel; and
a self-supporting filling-bonding material having a shape with an uneven thickness, the uneven thickness being defined between a curved surface and an opposing surface, wherein the curved surface has a principal curvature of 1/5000 mm −1 or more,
at least one of the first panel or the second panel having a curved surface,
the first panel and the second panel being directly bonded to each other with the filling-bonding material,
wherein the filling-bonding material has a light-transmitting portion, wherein the light transmitting portion has an average residual phase difference (R ave ) of 20 nm/mm or less and/or an in-plane standard deviation (s) of a phase difference of 10 nm or less.

18. The protective panel for an optical device according to claim 17 ,
wherein the panel with a curved surface, of the first panel and the second panel, and the filling-bonding material have a difference in refractive index of 0.1 or less.

19. The protective panel according to claim 17 , wherein the filling-bonding material has a storage modulus at 23° C. of 1 MPa or greater and a tensile strength at break of 1 MPa or greater.

20. The protective panel for an optical device according to claim 17 ,
wherein at least one of the first panel or the second panel is a glass plate.

21. The protective panel according to claim 20 , wherein the filling-bonding material has a 180° peel strength at 300 mm/min of 5 N/25 mm or greater.

22. An optical device comprising the protective panel for an optical device according to claim 17 .

Assignees

• Sekisui Chemical Co Ltd

Inventors

• Fukatani Juichi
• Okabayashi Takazumi
• Nakamura Kozo
• Wada Atsushi
• Nakatani Hiroyuki

Classifications

• C09J2459/00

  Presence of polyacetal · CPC title

• C09J2203/318

  for the production of liquid crystal displays · CPC title

• C09J129/14 Primary

  Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols · CPC title

• C09J7/10

  without carriers · CPC title

• B32B27/365

  comprising polycarbonates · CPC title