Mitsui Chemicals, Inc.

Yoshisada Tamo

Takayuki Uekusa

Masahiko Okamoto

Hirokazu Tanaka

An object of the present invention is to provide a stretchable structure that has stretchability together with high stress relaxation properties, and provides fit feeling with less tightening by recovering slowly after stretching. The object is achieved by a stretchable structure having the following characteristics: a tensile permanent set (PS) of 1% or more and 50% or less, wherein the tensile permanent set (PS) is a value obtained 10 minutes after 150% elongation at a tension rate of 200 mm/minute in accordance with JIS K7127, and a ratio PS/PSof 1.10 or more, wherein the PSis the tensile permanent set obtained 10 minutes after the elongation and the PSis the tensile permanent set obtained 1 minute after the elongation.

Stretchable structure, multilayered stretchable sheet, spun yarn, and fiber structure

The present invention provides a 4-methyl-1-pentene/&#x3b1;-olefin copolymer being excellent in lightness, stress absorption, stress relaxation, vibration damping properties, scratch resistance, abrasion resistance, toughness, mechanical properties and flexibility, having no stickiness during molding operation and being excellent in the balance among these properties; a composition comprising the polymer; and uses thereof. The 4-methyl-1-pentene/&#x3b1;-olefin copolymer (A) of the present invention satisfies specific requirements, and comprises 5 to 95 mol % of a structural unit (i) derived from 4-methyl-1-pentene, 5 to 95 mol % of a structural unit (ii) derived from at least one kind of &#x3b1;-olefin selected from &#x3b1;-olefins having 2 to 20 carbon atoms excluding 4-methyl-1-pentene and 0 to 10 mol % of a structural unit (iii) derived from a non-conjugated polyene, provided that the total of the structural units (i), (ii), and (iii) is 100 mol %.

4-methyl-1-pentene/&#x3b1;-olefin copolymer, composition comprising the copolymer and 4-methyl-1-pentene copolymer composition

To provide a 4-methyl-1-pentene/olefin (co)polymer composition which is excellent in transparency and heat resistance and is excellent also in elongation and toughness and to provide a molded product composed of the composition, a film composed of the composition, which is excellent in transparency, heat resistance and dimensional stability and has been uniformly stretched, and a hollow molded product composed of the composition, which is excellent in transparency, heat resistance and toughness and is excellent also in dimensional stability. The 4-methyl-1-pentene (co)polymer composition of the present invention comprises a specific 4-methyl-1-pentene (co)polymer (A) and a specific 4-methyl-1-pentene/&#x3b1;-olefin copolymer (B) in a specific ratio.

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Ichihara, Japan

Yoshisada Tamo