Acrylic film, method for producing same, laminate film, laminated injection molded article, and method for producing rubber-containing polymer

Patent metadata

Field	Value
Publication number	US-2017190822-A1
Application number	US-201715461725-A
Country	US
Kind code	A1
Filing date	Mar 17, 2017
Priority date	Sep 7, 2012
Publication date	Jul 6, 2017
Grant date	—

Abstract

An acrylic film having few fish eyes and a method for producing latex of an acrylic rubber-containing polymer having low amounts of coarse particles, excellent filtering properties, and low filter clogging frequency during a filtration step for removing foreign substances are provided. An acrylic film containing an acrylic rubber-containing polymer (G) has a thickness of 30 to 300 μm, wherein the number of fish eyes that are 0.001 mm 2 or greater in size is 130/m 2 or fewer when a section having a light transmission rate of 75% or less for light having a wavelength of 400 to 1100 nm was detected as a fish eye.

First claim

1 .- 4 . (canceled)

5 . A method for producing an acrylic rubber-containing polymer (G) used for an acrylic film, the method comprising multi-stage polymerization steps including the following steps (1) and (2):
(1) a first stage polymerization step in which a first emulsion having a monomer mixture (a) containing 20% by mass or more of alkyl acrylate emulsified in water is supplied to a polymerization vessel, and (2) a second stage polymerization step in which a second emulsion having a monomer mixture (b) containing 50% by mass or more of alkyl methacrylate emulsified in water is supplied to the polymerization vessel after the first polymerization step.

6 . The method for producing an acrylic rubber-containing polymer (G) according to claim 5 , wherein a polymerization step with at least one stage is included between the step (1) and the step (2).

7 . The method for producing an acrylic rubber-containing polymer (G) according to claim 5 , wherein a number average particle diameter of a dispersion phase is 300 μm or less for the first emulsion and the second emulsion, respectively.

8 .- 14 . (canceled)

Assignees

• Mitsubishi Rayon Co

Inventors

• Hara Naomi
• Yamamoto Masato
• Shimonaka Hidehito
• Konokawa Yuuhei

Classifications

• B29K2033/12

  Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate · CPC title

• C08L33/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title

• C08L33/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• Y10T428/254

  Polymeric or resinous material · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title