Substrate film

Patent metadata

Field	Value
Publication number	US-2016195641-A1
Application number	US-201414787436-A
Country	US
Kind code	A1
Filing date	Jun 19, 2014
Priority date	Jun 19, 2013
Publication date	Jul 7, 2016
Grant date	—

Abstract

There are provided a substrate film, a laminate, and method of manufacturing a polarizing film. The present application provides a substrate film capable of effectively manufacturing a polarizing film having a thickness of about 10 μm or less, about 8 μm or less, about 7 μm or less, about 6 μm or less, or about 5 μm or less and having an excellent function such as polarization performance, a laminate, and a method of manufacturing the same. According to the invention, it is possible to prevent tearing, curling, or the like from occurring in the elongation process and manufacture a polarizing film by easily elongating a polarization material such as a PVA-based resin.

First claim

What is claimed is:

1 . An elongatable substrate film satisfying the following Formula 1:
E/R≧ 5,  [Formula 1]
where, in Formula 1, E denotes an elongation (unit: %) of the elongatable substrate film measured at room temperature, R denotes a restoration ratio (unit: %), the restoration ratio is measured such that a laminate manufactured by adhering a polyvinyl alcohol film having the same horizontal and vertical lengths as the substrate film and a thickness of 30 μm to a surface of the substrate film cut to a horizontal length of 50 mm and a vertical length of 100 mm is elongated 5 times in a vertical direction in water (temperature: 60° C.), is taken out of the water, the polyvinyl alcohol film is released, the laminate is maintained for 1 hour at room temperature, a length (T) of the substrate film in a vertical direction is measured, and the measured value is assigned to Formula ┌100×(T−A)/A┘, where A in the Formula is a vertical length of the substrate film before the elongation.

2 . The elongatable substrate film of claim 1 ,
wherein the elongation is in a range of 200% to 1500%.

3 . The elongatable substrate film of claim 1 ,
wherein the tensile strength is in a range of 20 MPa to 200 MPa.

4 . The elongatable substrate film of claim 1 ,
wherein an integral value of the elongation curve is in a range of 2000 Nmm to 10,000 Nmm.

5 . The elongatable substrate film of claim 1 ,
wherein a yield point is in a range of 10 MPa to 150 MPa.

6 . The elongatable substrate film of claim 1 ,
wherein an elastic limit is in a range of 200 MPa to 1,000 MPa.

7 . The elongatable substrate film of claim 1 , comprising
a thermoplastic polyurethane.

8 . The elongatable substrate film of claim 7 ,
wherein the thermoplastic polyurethane is a reaction product of a mixture including a polyol, a polyisocyanate compound, and a chain extender.

9 . The elongatable substrate film of claim 8 ,
wherein the polyol has a weight-average molecular weight in a range of 500 to 5,000.

10 . The elongatable substrate film of claim 8 ,
wherein the total weight of the polyisocyanate compound and the chain extender in the mixture is in a range of about 1 part by weight to 90 parts by weight with respect to 100 parts by weight of the polyol.

11 . The elongatable substrate film of claim 8 ,
wherein the mixture includes the polyisocyanate compound of 1 part by weight to 50 parts by weight with respect to 100 parts by weight of the polyol.

12 . The elongatable substrate film of claim 8 ,
wherein the mixture includes the chain extender at 0.1 part by weight to 30 parts by weight with respect to 100 parts by weight of the polyol.

13 . A laminate, comprising:
the substrate film of claim 1 ; and a polarizable material layer formed on either or both surfaces of the substrate film.

14 . The laminate of claim 13 ,
wherein the polarizable material layer is a polyvinyl alcohol-based resin-containing film or coating layer.

15 . The laminate of claim 13 ,
wherein the polarizable material layer has a thickness in a range of 15 μm to 100 μm.

16 . A method of manufacturing a polarizing film including elongation of the laminate of claim 13 .

17 . The method of claim 16 ,
wherein the elongation is performed at a draw ratio in a range of 2 times to 15 times an original length.

18 . The method of claim 16 ,
wherein the elongation is performed in an aqueous solution in a range of 20° C. to 80° C.

19 . The method of claim 18 ,
wherein the aqueous solution is a boric acid solution.

20 . The method of claim 16 ,
wherein the polarizable material layer has a thickness of 10 μm or less after the elongation.

Assignees

• Lg Chemical Ltd

Inventors

• Yang Se Woo
• Nam Sung Hyun
• Rah Kyun Il
• Hwang Yoon Tae
• Jung Jong Hyun
• Yu Hye Min
• Hwang Ji Young
• Park Eun Suk

Classifications

• B29C55/023 Primary

  using multilayered plates or sheets · CPC title

• B32B2250/24

  All layers being polymeric · CPC title

• B32B2038/0028

  Stretching, elongating · CPC title

• B29C55/02

  of plates or sheets · CPC title

• B32B2307/42

  Polarizing, birefringent, filtering · CPC title