Transparent multilayer film containing poly(meth)acrylimide-based resin layer, and method for producing said transparent multilayer film

Patent metadata

Field	Value
Publication number	US-2016229159-A1
Application number	US-201415022889-A
Country	US
Kind code	A1
Filing date	Jul 4, 2014
Priority date	Sep 20, 2013
Publication date	Aug 11, 2016
Grant date	—

Abstract

Embodiments of the invention provide a transparent poly(meth)acrylimide-based resin multilayer film exhibiting excellent surface smoothness, transparency, outer appearance, and resistance to puchability. According to at least one embodiment, there is provided a method for producing said transparent multilayer film, in which the transparent multilayer film in which a first poly(meth)acrylimide-based resin layer (α1), an aromatic polycarbonate-based resin layer (β), and a second poly(meth)acrylimide-based resin layer (α2) are directly laminated in said order, and in that the total light transmittance exceeds 90% and the haze is 2.0% or lower. The transparent multilayer film is produced by continuously coextruding, from a T die, a molten film of the transparent multilayer film in which the aforementioned layers were directly laminated in the aforementioned order, and by supplying and then pressing the molten film between a first mirror body that has a surface temperature between 100 and 200° C. and a second mirror body that has a surface temperature between 20 and 200° C.

First claim

1 . A transparent multilayer film, comprising:
a first poly(meth)acrylimide resin layer (α1); an aromatic polycarbonate resin layer (β); and a second poly(meth)acrylimide resin layer (α2), the layers being laminated directly in this order, wherein the transparent multilayer film satisfies the following requirements (i), (ii) and (iii): (i) a total light transmittance of higher than 90%; (ii) (ii) a haze of 2.0% or lower; and (iii) a retardation of 50 nm or lower.

2 . A hard coat-laminated film, comprising a transparent multilayer film according to claim 1 , and a hard coat formed on at least one surface the transparent multilayer film.

3 . (canceled)

4 . An image display apparatus member, comprising a film according to claim 1 .

5 . A method for producing a transparent multilayer film, comprising the steps of:
continuously coextruding, with a coextrusion apparatus equipped with an extruder and a T die, a molten film of a transparent multilayer film from the T die, wherein the transparent multilayer film has a first poly(meth)acrylimide resin layer (α1), an aromatic polycarbonate resin layer (β), and a second poly(meth)acrylimide resin layer (α2), the layers being laminated directly in this order; feeding and pressing the molten film of the transparent multilayer film between a first rotating or circulating mirror-finished body and a second rotating or circulating mirror-finished body; and delivering the molten film to a following transfer roll while making the molten film to be held on the first rotating or circulating mirror-finished body, wherein the first rotating or circulating mirror-finished body has a surface temperature of 100° C. or higher and 200° C. or lower, the second rotating or circulating mirror-finished body has a surface temperature of 20° C. or higher and less than 200° C., and the surface temperature of the first rotating or circulating mirror-finished body is higher than the surface temperature of the second rotating or circulating mirror-finished body.

6 . A method for producing a hard coat-laminated film, comprising the steps of:
(1) producing a transparent multilayer film by a method according to claim 5 ; and (2) forming a hard coat on at least one surface of the transparent multilayer film obtained in the step (1).

7 . (canceled)

8 . A transparent multilayer film according to claim 1 , wherein the transparent multilayer film has a retardation of 12 nm or lower.

9 . A method according to claim 5 , wherein the surface temperature of the first mirror-finished body is 10 to 90° C. higher than the surface temperature of the second mirror-finished body.

10 . A method according to claim 5 or 9 , wherein the surface temperature of the first mirror-finished body ranges from 120 to 200° C.; and the surface temperature of the second mirror-finished body ranges from 60 to 200° C.

11 . A method for producing an image display apparatus, which comprises using a film obtained by the method according to any one of claims 5 , 6 , or 9 .

12 . A method for producing an image display apparatus, which comprises using a film obtained by the method according to claim 10 .

Assignees

• Riken Technos Corp

Inventors

• Nakashima Kohei
• NEGIMOTO Shintaro

Classifications

• B32B2307/554

  Wear resistance · CPC title

• B29C48/305

  having a wide opening, e.g. for forming sheets · CPC title

• B32B2250/03

  3 layers · CPC title

• B32B27/365

  comprising polycarbonates · CPC title

• B32B2307/536

  Hardness · CPC title