Patent ID: 11866572
Assignee: TOYOBO CO., LTD.
Field: Surface technology, coating (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 0:
1. A polyolefin-based resin film comprising a polyolefin-based resin composition, wherein the polyolefin-based resin composition comprises at least a propylene-α olefin random copolymer and the following 1) to 6) are satisfied:
1) A content of an olefin-based block copolymer is 0 to 2 parts by weight based on 100 parts by weight of the propylene-α olefin random copolymer in the polyolefin-based resin composition;
2) A content of an olefin-based copolymeric elastomer resin is 0 to 2 parts by weight based on 100 parts by weight of the propylene-α olefin random copolymer in the polyolefin-based resin composition;
3) A content of a propylene homopolymer is 0 to 40 parts by weight based on 100 parts by weight of the propylene-α olefin random copolymer in the polyolefin-based resin composition;
4) The polyolefin-based resin film exhibits a thermal shrinkage rate after heating at 120° C. for 30 minutes of 25% or less in a direction in which the thermal shrinkage rate after heating at 120° C. for 30 minutes is larger between a longitudinal direction and a lateral direction of the polyolefin-based resin film;
5) A planar orientation coefficient ΔP calculated from a refractive index of the polyolefin-based resin film is 0.0100 or more and 0.0145 or less; and
6) An orientation coefficient ΔNx in the longitudinal direction of the polyolefin-based resin film is 0.010 or more, the orientation coefficient ΔNx being calculated from Formula (1):

ΔNx=Nx−[(Ny+Nz)/2]  Formula (1), wherein Nx is a refractive index in the longitudinal direction, Ny is a refractive index in a direction perpendicular to the longitudinal direction, and Nz is a refractive index in a plane direction.