Mitsui Chemicals, Inc.

Tomohiro Abe

Makoto Egawa

Ikuo Akai

Satoshi Ikeda

Masayoshi Yamaguchi

Koji Matsunaga

Kiminori Noda

Shinya Tanaka

Koya Yoshimoto

Tatsuya Oku

Takayuki Kuroki

A laminate film () of the present invention includes a heat sealing layer () composed of a resin composition including, with respect to 20 to 95 parts by weight of a propylene-based polymer (A) having a melting point (Tm) of equal to or higher than 120&#xb0; C. and equal to or lower than 170&#xb0; C. as measured by differential scanning calorimetry (DSC), a total of 5 to 80 parts by weight of two or more kinds of copolymers selected from the group consisting of a propylene.1-butene copolymer (B) containing a unit derived from propylene in an amount of 51 to 95 mol % and a unit derived from 1-butene in an amount of 5 to 49 mol %, wherein the total of the unit derived from propylene and the unit derived from 1-butene is 100 mol %, a copolymer (C) of ethylene and an &#x3b1;-olefin having 3 to 20 carbon atoms, and a copolymer (D) of 1-butene and an &#x3b1;-olefin having 3 carbon atoms or 5 to 20 carbon atoms containing a constitutional unit derived from 1-butene in an amount of 50 to 99 mol % and a constitutional unit derived from an &#x3b1;-olefin having 3 carbon atoms or 5 to 20 carbon atoms in an amount of 1 to 50 mol %, wherein the total of the unit derived from 1-butene and the unit derived from the &#x3b1;-olefin is 100 mol %, wherein each of Component (B), Component (C), and Component (D) does not correspond to Component (A), and the total amount of Component (A), Component (B), Component (C), and Component (D) is 100 parts by weight, and a base layer (), in which a surface of the heat sealing layer () opposite to the base layer () has a wet tension of 32 to 45 mN/m.

Laminate film and packaging bag using same

Disclosed is a stretched laminated filmhaving a heat-sealable layercomposed of a resin composition which contains 50 to 97 parts by mass of a propylene-based polymer (A) having a melting point (Tm) of not lower than 120&#xb0; C. but not higher than 170&#xb0; C. and comprising more than 50% by mol of a structural unit derived from propylene, 3 to 50 parts by mass of a 1-butene-based polymer (B) having a melting point (Tm) of lower than 120&#xb0; C. and comprising 10 to 90% by mol of a structural unit derived from 1-butene and 10 to 90% by mol of a structural unit derived from an &#x3b1;-olefin having 3 or 5 to 20 carbon atoms, and optionally 3 to 30 parts by mass of an ethylene &#x3b1;-olefin copolymer (C) comprising 50 to 99% by mol of a structural unit derived from ethylene and 1 to 50% by mol of a structural unit derived from an &#x3b1;-olefin having 3 to 20 carbon atoms, wherein the sum of the component (A) and the component (B) is 100 parts by mass; and a base layer

Stretched laminated film

An object of the invention is to provide compositions which have low-temperature heat sealing properties, are free from stickiness, may achieve a heat seal strength controlled within a certain definite range when heat sealing takes place at low temperatures, have small changes in heat seal strength with time, and are such that in the packaging applications, the strength required to open the packages may be easily controlled within a certain definite range, and high-performance packages may be designed. The invention resides in a 1-butene.&#x3b1;-olefin copolymer composition including 99 to 1 parts by mass of at least one olefin polymer (X) selected from propylene polymers (X-1) and ethylene polymers (X-2), and 1 to 99 parts by mass of a 1-butene.&#x3b1;-olefin copolymer (Y) containing 0.1 to 30 mol % of one or more &#x3b1;-olefins selected from &#x3b1;-olefins and having a molecular weight distribution (Mw/Mn) of 1.0 to 3.5 [wherein the total of (X) and (Y) in the composition is 100 parts by mass].

1-butane-&#x3b1;-olefin copolymer composition

The polyolefin composite film is excellent in low-temperature heat sealability, heat-sealing strength and transparency, and at least has surface layer [i]//intermediate layer [iii]//core layer[i], wherein the surface layer[i]includes a propylene resin composition including 0-50 wt % of a specific propylene&#x3b1;-olefin random copolymer (A) and/or a specific 1-butene&#x3b1;-olefin copolymer (E), and 50-100 wt % of a propylene polymer (B) having a melting point of 120-170&#xb0; C. ((A), (E) and (B) in the surface layer totals 100 wt %); the core layer [ii]includes a propylene resin composition including 70-100 wt % of a crystalline polypropylene (C) having a melting point of 150-170&#xb0; C., and 0-30 wt % of the copolymer (A) ((C) and (A) in the core layer totals 100 wt %); and the intermediate layer[iii]includes a propylene resin composition including 50-95 wt % of the crystalline polypropylene (C) and 50-5 % of the polymer (B), the copolymer (A), andor the copolymer (E) ((C), (B), (A) and (E) in the intermediate layer totals 100 wt %).

Polyolefin composite film

1-butene &#x3b1;-olefin copolymer composition

Growing community of inventors

Chiba, Japan

Tomohiro Abe