Mitsui Chemicals, Inc.

Tatsuya Oku

Kiminori Noda

Makoto Egawa

Satoshi Ikeda

Tomohiro Abe

Koya Yoshimoto

A laminated sheet of a two-layer sheet in which an L1 layer including 50 to 99 parts by mass of an ethylene-based polymer (E1) having a density of 0.890 to 970 kg/mand 1 to 50 parts by mass of a propylene-based polymer (P1) is in contact with an L2 layer including 50 to 100 parts by mass of a propylene-based polymer (P2) and 0 to 50 parts by mass of an ethylene-based elastomer (E2) having a density of equal to or more than 850 kg/mand less than 890 kg/m, in which the propylene-based polymer (P1) includes a propylene-based elastomer (P1a) including a propylene-derived constitutional unit and an ethylene-derived constitutional unit and/or a constitutional unit derived from an &#x3b1;-olefin having 4 to 20 carbon atoms, and having a melting point (Tm) that is lower than 120&#xb0; C. or not observable; and a solar cell backsheet formed using the same.

Laminated sheet and solar cell backsheet using same

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

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Ichihara, Japan

Tatsuya Oku