Multilayer film, polarization plate, and multilayer film production method

Patent metadata

Field	Value
Publication number	US-10338291-B2
Application number	US-201415107041-A
Country	US
Kind code	B2
Filing date	Dec 24, 2014
Priority date	Dec 27, 2013
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

A multilayer film including: an A layer composed of a thermoplastic resin; and a B layer disposed on at least one of the surfaces of the A layer, the B layer being composed of a material Y that contains as a main component a polymer having a glass transition temperature of −50 to 40° C., and a thickness Ta of the A layer, a thickness Tb of the B layer, a planar orientation coefficient P of the A layer, a loss modulus Ea″ of the A layer, a loss modulus Eb″ of the B layer, a storage modulus Ea′ of the A layer, and a storage modulus Eb′ of the B layer satisfying following formulae (1) to (4):

2.5×10 −3 <Tb/Ta <1.0×10 −1   (1)

P >1.0×10 −3   (2)

Eb″>Ea ″+0.01 GPa  (3)

Eb′<Ea ′−1 GPa.  (4)

First claim

The invention claimed is:

1. A multilayer film comprising: an A layer composed of a thermoplastic resin; and a B layer disposed on at least one of the surfaces of the A layer,
the B layer being composed of a material Y that contains as a main component a polymer having a glass transition temperature of −50 to 40 ° C. , and
a thickness Ta of the A layer, a thickness Tb of the B layer, a planar orientation coefficient P of the A layer, a loss modulus Ea″ of the A layer, a loss modulus Eb″ of the B layer, a storage modulus Ea′ of the A layer, and a storage modulus Eb′ of the B layer satisfying following formulae (1) to (4):
2.5×10 −3 <Tb/Ta< 1.0×10 −1   (1)

P> 1.0×10 −3   (2)

Eb″>Ea″+ 0.01 GPa  (3)

Eb′<Ea′− 1 GPa.  (4)

2. The multilayer film according to claim 1 , wherein the thermoplastic resin contains a polymer having an alicyclic structure.

3. The multilayer film according to claim 1 , wherein the polymer contained in the material Y is a polyurethane.

4. The multilayer film according to claim 3 , wherein the polyurethane has a carbonate structure in the skeleton structure thereof.

5. The multilayer film according to claim 1 , wherein the multilayer film has a two-layer structure having only one A layer and only one B layer.

6. The multilayer film according to claim 1 , wherein the material Y is an aqueous emulsion substantially containing no organic solvent.

7. The multilayer film according to claim 1 , wherein
0.01 <Tb/Ta< 0.09  (1)

P> 2.0×10 −3   (2)

Eb″>Ea″+ 0.015 GPa  (3)

Eb′≤Ea′− 1.2 GPa.  (4)

8. The multilayer film according to claim 1 , wherein the polymer contained in the material Y has a glass transition temperature of −35 to −10° C.

Assignees

• Zeon Corp

Inventors

• Sudeji Hironari

Classifications

• G02B5/305

  including organic materials, e.g. polymeric layers · CPC title

• C09D175/06

  from polyesters · CPC title

• C08G18/44

  Polycarbonates · CPC title

• B32B2457/202

  LCD, i.e. liquid crystal displays · CPC title

• B32B2307/514

  Oriented · CPC title