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US-20260125314-A1 - TRANSPARENT LAMINATE

US20260125314A1US 20260125314 A1US20260125314 A1US 20260125314A1US-20260125314-A1

Abstract

A cover member according to the present invention includes a transparent substrate that has a first main surface and a second main surface and a transparent first functional layer that is layered on the first main surface of the substrate.

Inventors

  • Koji Takahashi
  • Hisao Imai
  • Kazuaki Oya
  • Kiyomi HAYASHI

Assignees

  • NIPPON SHEET GLASS COMPANY, LIMITED

Dates

Publication Date
20260507
Application Date
20251219
Priority Date
20191227

Claims (18)

  1. 1 . A transparent laminate comprising: a transparent substrate that has a first surface and a second surface; a transparent first functional layer that is layered on the first surface of the substrate; and a second functional layer that is layered on the first functional layer and is permeable to moisture; wherein the first functional layer has a hygroscopic antifog layer, the hydroscopic antifog layer comprising: a first metal oxide having a water absorbent resin and a water repellent group, and microparticles having a second metal oxide; wherein the second functional layer contains hollow particles and a binder that binds the hollow particles together; and wherein when the refractive index of the first functional layer is represented by X, the refractive index of the second functional layer is √X±0.1.
  2. 2 . The transparent laminate according to claim 1 , wherein the first functional layer has a surface roughness Ra of 1 to 1000 nm.
  3. 3 . The transparent laminate according to claim 1 , wherein the first functional layer includes: a substrate film that has a first surface and a second surface; a sticky layer that is layered on the second surface of the substrate film; and the antifog layer that is layered on the first surface of the substrate film, and the substrate film is fixed to the first surface of the substrate via the sticky layer.
  4. 4 . The transparent laminate according to claim 1 , wherein the first functional layer includes a sticky layer and an antifog layer, and the antifog layer is fixed to the first surface of the substrate via the sticky layer.
  5. 5 . The transparent laminate according to claim 1 , wherein the antifog layer is layered on the first surface of the substrate.
  6. 6 - 15 . (canceled)
  7. 16 . The transparent laminate according to claim 1 , wherein the substrate is float glass produced using a float process, and the concentration of tin oxide in the first surface is lower than the concentration of tin oxide in the second surface.
  8. 17 . The transparent laminate according to claim 1 , wherein the substrate is float glass produced using a float process, and the concentration of tin oxide in the first surface is higher than the concentration of tin oxide in the second surface.
  9. 18 . The transparent laminate according to claim 1 , further comprising a third functional layer that is layered on the second surface of the substrate.
  10. 19 . The transparent laminate according to claim 1 , wherein the refractive index of the hollow particles is 1.15 to 2.70.
  11. 20 . The transparent laminate according to claim 1 , wherein the hollow particles have an average particle diameter of 20 to 100 nm.
  12. 21 . The transparent laminate according to claim 1 , wherein the hollow particles are selected from the group consisting of silica, magnesium fluoride, alumina, aluminosilicate, titania, and zirconia.
  13. 22 . The transparent laminate according to claim 1 , wherein the second functional layer contains a solvent having a boiling point that is at least 100° C. and not higher than 300° C.
  14. 23 . The transparent laminate according to claim 22 , wherein the solvent contains 3-methoxy-3methyl-1-butanol as a main component.
  15. 24 . The transparent laminate according to claim 22 , wherein the second functional layer contains the solvent at a concentration of 1 ppb or more and 5 g/cm 3 or less.
  16. 25 . The transparent laminate according to claim 1 , wherein the binder contains at least one of polysilsesquioxane and silica.
  17. 26 . The transparent laminate according to claim 1 , wherein the second functional layer has a void ratio of 0 to 70 vol %.
  18. 27 . The transparent laminate according to claim 1 , wherein the second functional layer includes a first layer that is layered on the first functional layer and a second layer that is layered on the first layer and has a lower refractive index than the first layer.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a Continuation of copending application Ser. No. 17/788,810 filed on Jun. 24, 2022, which is the National Phase under 35 U.S.C. § 371 of International Application No. PCT/JP2020/049037, filed on Dec. 25, 2020, which claims the benefit under 35 U.S.C. § 119(a) to Patent Application Nos. 2019-239846, 2019-239847, 2020-084822, and 2020-100559 filed in Japan on Dec. 27, 2019; Dec. 27, 2019; May 13, 2020, and Jun. 9, 2020, respectively, all of which are hereby expressly incorporated by reference into the present application. TECHNICAL FIELD The present invention relates to a transparent laminate. BACKGROUND ART Transparent substrates such as glass plates and resin plate members are used for various uses and are sometimes used as cover members for protecting articles, for example (Patent Literature 1). CITATION LIST Patent Literature Patent Literature 1: JP 2017-144575A SUMMARY OF INVENTION Technical Problem In recent years, such cover members are required not only to protect articles but also to have other functions. The present invention was made to solve the above problem, and has an object of providing a cover member that can also be used for uses other than protecting an article. Solution to Problem Item 1: A transparent laminate including: a transparent substrate that has a first main surface and a second main surface; anda transparent first functional layer that is layered on the first main surface of the substrate. Item 2: The transparent laminate according to Item 1, wherein the first functional layer has an antifog function. Item 3: The transparent laminate according to Item 1 or 2, wherein the first functional layer has a surface roughness Ra of 1 to 1000 nm. Item 4: The transparent laminate according to any one of Items 1 to 3, wherein the first functional layer includes:a substrate film that has a first main surface and a second main surface;a sticky layer that is layered on the second main surface of the substrate film; andan antifog layer that is layered on the first main surface of the substrate film, andthe substrate film is fixed to the first main surface of the substrate via the sticky layer. Item 5: The transparent laminate according to any one of Items 1 to 3, wherein the first functional layer includes a sticky layer and an antifog layer, andthe antifog layer is fixed to the first main surface of the substrate via the sticky layer. Item 6: The transparent laminate according to any one of Items 1 to 3, wherein the first functional layer includes an antifog layer, andthe antifog layer is layered on the first main surface of the substrate. Item 7: The transparent laminate according to any one of Items 4 to 6, wherein the antifog layer includes a moisture absorbing layer that contains a hygroscopic resin material. Item 8: The transparent laminate according to Item 7, wherein the antifog layer includes the moisture absorbing layer and a hydrophilic layer that is layered on the moisture absorbing layer and is hydrophilic. Item 9: The transparent laminate according to Item 8, wherein the hydrophilic layer included in the antifog layer contains polyether-modified dimethylsiloxane represented by the following Formula (A), where m is an integer of 2 or more, and n, x, and y are integers of 1 or more independently of each other, andR1 is a hydrogen atom or a methyl group, and R2 is an alkyl group having 1 to 3 carbon atoms. Item 10: The transparent laminate according to Item 9, wherein in the Formula (A),m is an integer of 1 to 3,n is an integer of 3 to 600,y/(x+y) is 0.01 or more and less than 1, andan average molecular weight is 3,000 to 300,000. Item 11: The transparent laminate according to Item 7, wherein, in the antifog layer, a hydrophilizing agent is dispersed in the moisture absorbing layer. Item 12: The transparent laminate according to Item 11, wherein the antifog layer contains a solvent having a boiling point that is at least 100° C. and not higher than 300° C. Item 13: The transparent laminate according to Item 12, wherein the solvent has an alcohol group. Item 14: The transparent laminate according to any one of Items 11 to 13, wherein the antifog layer has an antifog property after a cloth impregnated with alcohol is rubbed against the antifog layer a predetermined number of times. Item 15: The transparent laminate according to any one of Items 11 to 14, wherein the antifog layer has an antifog property after undergoing a predetermined constant-temperature constant-humidity test. Item 16: The transparent laminate according to any one of Items 11 to 15, wherein the antifog layer is constituted by a single layer. Item 17: The transparent laminate according to any one of Items 1 to 6, wherein the first functional layer contains an inorganic compound as a main component. Item 18: The transparent laminate according to Item 17, wherein the transparent laminate has a visible light transmittance of 85% or more, andthe transparent lamin