Patent ID: 9448335
Filing Date: 2016-09-20
CPC Classification: B29C,B29D,B29K,C08J,C08K,C08L,C09K,G02B

Claim Text:
1. A polarization film comprising a film product of a composition for a polarization film, the composition comprising: a polyolefin component comprising a blend of a polypropylene and a polyethylene-polypropylene copolymer, wherein the polyolefin component contains the polypropylene and the polyethylene-polypropylene copolymer in a weight ratio of about 6:4 to about 4:6, the polyethylene-polypropylene copolymer comprises an ethylene group in an amount of about 1 wt % to about 50 wt %, there is no other comonomer present in the polypropylene and the polyethylene-polypropylene copolymer, and other polyolefins are present in a total amount of less than or equal to about 10 wt % based on the total weight of the polypropylene and the polyethylene-polypropylene copolymer; and a dichroic dye in an amount of about 0.05 parts by weight to about 2 parts by weight, based on 100 parts by weight of the polyolefin component, wherein the polarization film is produced by melting the composition and uniaxially elongating a sheet formed from the molten composition at an elongation ratio of about 300% to about 1,000%, and wherein the polyolefin component in the film product has a haze value of less than 2%, and the polarization film has a combination of a total light transmittance of greater than 30% and a polarization efficiency of greater than 97% in the wavelength range of visible light when the sheet elongation ratio is about 100%.