Japan Polypropylene Corporation

Japan Polychem Corporation

Gen Kanai

Yuji Kadowaki

Takashi Yamashita

Takao Tayano

Kuninori Takahashi

Shinichi Kitade

Iku Kouzai

Tadashi Sezume

The invention discloses a multilayer propylene resin sheet and a heat-treatable packaging material which have an excellent transparency, flexibility and very-low-temperature impact resistance, and which reduce the thickness variation during lamination, suppress appearance defects such as interfacial roughness and mitigate thinning during fabrication. The multilayer propylene resin sheet is composed of at least two layers, which are (1) an inner layer and (2) an outer layer. The inner layer (1) is made of a resin composition containing 40 to 89 wt % of a specific propylene resin composition (A), 10 to 40 wt % of a specific ethylene-&#x3b1;-olefin copolymer (B), and 1 to 20 wt % of a specific propylene resin (C). The outer layer (2) is made of a specific propylene resin composition.

Propylene resin multi-layer sheet, and packaging body for heat treatment using same

The invention provides a multilayer sheet and a heat-treatable packaging material which have excellent flexibility, transparency, impact resistance, heat resistance, heat-sealability and cleanliness, which are endowed with a good formability without readily incurring drawbacks such as external defects and thickness fluctuations when subjected to multilayer formation, and which, even at a reduced thickness, have an excellent sheet substrate strength decrease-inhibiting effect. The multilayer sheet is a multilayer propylene resin sheet composed of at least two layers of an inner layer () and an outer layer (2), wherein the inner layer (1) is made of a resin composition (X) containing from 60 to 90 wt % of (A) a propylene resin composition which includes from 30 to 70 wt % of (A1) a specific propylene-&#x3b1;-olefin random copolymer component and from 70 to 30 wt % of (A2) a propylene-ethylene random copolymer component, from 40 to 10 wt % of (B) an ethylene-&#x3b1;-olefin copolymer, and from 1 to 25 wt % of (C) a propylene resin, and the outer layer (2) is made of a specific propylene resin composition Y. The heat-treatable packaging material can be obtained from the multilayer propylene resin sheet.

Multilayer propylene resin sheet and heat-treatable packaging material using same

A polypropylene based heat shrinkable film obtained by using a propylene-ethylene block copolymer (A) which satisfies the following requirements (A-i) to (A-iv), and having heat shrinkability imparted by orientation in at least one direction:

Polypropylene based heat shrinkable film

A laminated film of a propylene resin layer and an ethylene resin layer is provided, which does not require solvent removal and recovery devices, etc., is low in influences against working environments and a danger of occurrence of fire, and has a high interlaminar adhesive force. That is, the invention relates to a laminated film prepared by melt extrusion laminating, without via an anchor coating agent, an ethylene based resin mainly comprising a linear ethylene/&#x3b1;-olefin copolymer having: a density of from 0.870 to 0.910 g/cm; and an MFR of from 1 to 100 g/10 min., the copolymer being obtained by copolymerizing ethylene and an &#x3b1;-olefin having from 3 to 20 carbon atoms, on the surface of a propylene based resin film formed from a crystalline propylene based random copolymer resin having a melting peak temperature of not higher than 140&#xb0; C., as prepared using a metallocene catalyst.

Laminated film

A resin composition for heat-shrinkable polypropylene shrink label, comprises: from 50 to 95% by weight of a crystalline propylene-&#x3b1;-olefin random copolymer mainly comprising propylene and from 5 to 50% by weight of an alicyclic hydrocarbon resin having a softening temperature of not lower than 110 degrees Celsius.

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Mie, Japan

Gen Kanai