Mitsui Chemicals, Inc.

Hidetake Nakano

Tetsuya Nakamura

Hirokazu Tanaka

Koya Yoshimoto

Masayoshi Yamaguchi

Kiminori Noda

Kazuaki Yasuda

Disclosed is a polyamide resin composition including 50% to 99% by mass of a polyamide (P) and 1% to 50% by mass of an acid-modified polyolefin (Q) satisfying the following requirements (1) to (3). (1) A melt flow rate (MFR) as measured at 230&#xb0; C. under a load of 2.16 kg is 50 to 200 (g/10 min). (2) An acid modification amount is 0.1% to 2.0% by mass. (3) The acid-modified polyolefin (Q) includes a modified product (q1) of an elastomer including 10% to 95% by mole of an ethylene-derived skeleton unit, 0% to 80% by mole of a propylene-derived skeleton unit, and 3% to 40% by mole of a skeleton unit derived from an &#x3b1;-olefin having 4 to 8 carbon atoms (with a total amount of the ethylene-derived skeleton unit, the propylene-derived skeleton unit, and the skeleton unit derived from an &#x3b1;-olefin being 100% by mole), the elastomer being modified by maleic acid or an anhydride thereof.

Polyamide resin composition with high fluidity

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

The present method for producing a crosslinked product include the steps of: melt molding an ethylene copolymer (A) or a resin composition containing the ethylene copolymer (A); and carrying out crosslinking; wherein the ethylene copolymer (A) contains a constitutional unit derived from ethylene and a constitutional unit derived from an &#x3b1;-olefin having 3 to 20 carbon atoms, and satisfies the following requirements (1), (2) and (3): (1) a vinyl group content per 1,000 carbon atoms as measured byH-NMR is from 0.06 to 1; (2) a ratio MFR/MFRis from 8.5 to 50; and (3) a density d is from 850 kg/mto 920 kg/m. The present method for producing a crosslinked product is capable of providing a crosslinked product having a good moldability and an excellent mechanical strength. Further, the present method is capable of providing a foamed product which is light weight and excellent in mechanical strength, with an excellent productivity; as well as providing crosslinked molded articles whose dimensional variations between individual products are small.

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Ichihara, Japan

Hidetake Nakano