Mitsui Chemicals, Inc.

Koya Yoshimoto

Masayoshi Yamaguchi

Makoto Egawa

Koji Matsunaga

Shinya Tanaka

Tomohiro Abe

Hidetake Nakano

Ikuo Akai

Kiminori Noda

Tetsuya Nakamura

Tatsuya Oku

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 graft-modified propylene.&#x3b1;-olefin copolymer (A) is obtained by graft-reacting a polar monomer onto a propylene.&#x3b1;-olefin copolymer (a) including 50 to 90 mol % of propylene-derived structural units (C3) and 10 to 50 mol % of C&#x3b1;-olefin-derived structural units (C&#x3b1;) (wherein the total of the structural units C3 and C&#x3b1; is 100 mol %), and satisfies the following requirements (i) to (iv) at the same time: (i) the amount of the polar monomer grafted is 0.4 to 1.5 wt %, (ii) the content of the polar monomer is not more than 1000 ppm, (iii) the content of a gel insoluble in xylene at 140&#xb0; C. is not more than 2.5 wt %, and (iv) the content of a volatile hydrocarbon compound is not more than 10 ppm.

Graft-modified propylene &#x3b1;-olefin copolymers and methods for producing the same

An adhesive with improved heat stability is provided. The adhesive includes an ethylene&#x22c5;&#x3b1;-olefin copolymer (A) having a number-average molecular weight of 5000 to 100000 in terms of polystyrene as measured by gel permeation chromatography and a density of 860 to 970 kg/m, wherein in the ethylene&#x22c5;&#x3b1;-olefin copolymer (A), the total number of vinyl-type double bond, vinylidene-type double bond, 2-substituted olefin-type double bond and 3-substituted olefin-type double bond is less than 0.5 per 1000 carbon atoms as measured byH-NMR.

Adhesive including ethylene&#x22c5;&#x3b1;-olefin copolymer

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

1-butene &#x3b1;-olefin copolymer composition

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Ichihara, Japan

Koya Yoshimoto