Toyobo Co., Ltd.

Wakato Tomatsu

Tadashi Nishi

Akira Matsuda

Hirokazu Ogi

Takamichi Goto

Tomoya Nishiki

Provided is a multilayer body having favorable thermal dimensional stability and capable of producing a food-packaging bag where without providing any perforations or guiding lines through laser half-cutting, a resistance at opening by tearing is low, and only a small extent of parting occurs; and a step is formed between opening ends on the front and back sides to be easily opened and contents can easily be taken out therefrom. A multilayer body having one or more types of base material films; and a polyolefin-based resin sealant film made from a polyolefin-based resin composition containing a propylene-α-olefin random copolymer, wherein 1) the base material films have orientation angles, a sum of absolute values of which is 25° to 85°, 2) the sealant film has a piercing strength of 5.0 to 15.0 N, and 3) the sealant film has an orientation coefficient ΔNx, in a longitudinal direction, of 0.0150 to 0.0230.

Multilayer body, and package using same

The invention provides a polyolefin-based resin film including a polyolefin-based resin composition that comprises a propylene-α olefin random copolymer, an ethylene-butene copolymeric elastomer, and a propylene-butene copolymeric elastomer, wherein (1) the polyolefin-based resin composition contains 2 to 9 parts by weight of the ethylene-butene copolymeric elastomer and 2 to 9 parts by weight of the propylene-butene copolymeric elastomer based on 100 parts by weight of the propylene-α olefin random copolymer; (2) 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; and (3) a planar orientation coefficient ΔP calculated from a refractive index of the polyolefin-based resin film is 0.0100-0.0145.

Polyolefin-based resin film and laminate including the same

The invention provides a polyolefin-based resin film including a polyolefin-based resin composition that includes at least a propylene-α olefin random copolymer, wherein (1) 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; (2) 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; (3) a propylene homopolymer is 0 to 40 parts by weight based on 100 parts by weight of the propylene-α olefin random copolymer; (4) the polyolefin-based resin film exhibits a thermal shrinkage rate of 25% or less in a direction in which the thermal shrinkage rate is larger between a longitudinal direction and a lateral direction; and (5) a planar orientation coefficient ΔP calculated from a refractive index of the polyolefin-based resin film is 0.0100-0.0145.

A polyolefin-based resin film containing (a) 90 to 97 parts by weight of at least one polyolefin-based resin selected from a propylene-ethylene block copolymer and a propylene-&#x3b1; olefin random copolymer and (b) 3 to 10 parts by weight of an ethylene-propylene copolymer elastomer, wherein the propylene-&#x3b1; olefin random copolymer is present in an amount of 0 to 50% by weight relative to the total amount of the propylene-ethylene block copolymer and the propylene-&#x3b1; olefin random copolymer, and the polyolefin-based resin film has a thermal shrinkage ratio in a longitudinal direction of 3% or more and 20% or less, a thermal shrinkage ratio in a rectangular direction to a width direction of 1% or less, and a yield stress in the longitudinal direction of 150 MPa or more and 250 MPa or less.

Polyolefin-based resin film

The objective of the present invention is to provide a packaging bag which is produced from a laminate, which is excellent in straight cut property and which hardly cause a parting, even if the laminate contains a biaxially stretched PBT film having a large distortedness of a molecular orientation axis. The laminate has a biaxially stretched film substrate consisting of a polyester resin composition and a sealant film consisting of a polyolefin resin composition, and has a straight cut property in a longitudinal direction of 5 mm or less. The polyester resin composition contains 60 wt % or more of a polybutylene telephthalate resin, and the polyolefin resin composition contains 40 wt % to 97 wt % of a propylene-ethylene block copolymer, 3 wt % to 10 wt % of an ethylene-propylene copolymer elastomer, and 0 wt % to 50 wt % of an ethylene-&#x3b1;olefin random copolymer.

Laminate and packaging bag comprising same

Provided is a polyethylene film that is more excellent in blocking in unwinding the film in the film roll state, and more excellent in blocking between sealants after lamination with a base material, and also having transparency and excellent heat sealing property even at low temperatures. A polyethylene film wherein in at least either face, a ratio between an arithmetic mean inclination angle in a machine direction of film (R&#x394;a (MD) [&#xb0;]), and an arithmetic mean inclination angle in a direction perpendicular to the machine direction (R&#x394;a (TD) [&#xb0;]) satisfies the following formula (1):1.2&#x2264;(TD)/(MD)&#x2264;3.6&#x2003;&#x2003;(1)

Polyethylene film

Provided is a polyethylene film showing more excellent blocking resistance in unwinding from the film roll state and more excellent blocking resistance between sealants after lamination with a base material, and having transparency and excellent heat sealing property even at low temperatures. A polyethylene film wherein in at least either face, a ratio between an arithmetic mean roughness in a machine direction of film (Ra(MD)), and an arithmetic mean roughness in a direction perpendicular to the machine direction (Ra(TD)) satisfies the following formula (1):1.2&#x2264;()/()&#x2264;3.6&#x2003;&#x2003;(1) (Ra(MD): arithmetic mean roughness [&#x3bc;m] measured in the machine direction of film, and Ra(TD): arithmetic mean roughness [&#x3bc;m] measured in the direction perpendicular to the machine direction of film).

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Inuyama, Japan

Wakato Tomatsu