Patent ID: 9442220
Filing Date: 2016-09-13
CPC Classification: B29C,B29D,B29K,C08J,C08K,C08L,C09K,G02B

Claim Text:
1. 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 4.5:5.5 to about 1:5, 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, wherein the dichroic dye has an absorbance of about 0.31 to 0.37 for light of all wavelengths ranging from about 380 nanometers to about 780 nanometers, and wherein an amount of the dichroic dye in the composition is about 0.05 parts by weight to about 2 parts by weight based on 100 parts by weight of the polyolefin component, wherein a crystallinity value of the polyolefin component, obtained by dividing an integral value of a heat emission peak that occurs upon heating and cooling of a film sample acquired from an about 300% to about 1000% elongation by an integral value of a heat emission peak when the crystallinity is about 100%, is about 50% or less, wherein a difference between a solubility parameter of the polyolefin component and a solubility parameter of the dichroic dye is about 0.1 to about 10, 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 1,000%.