Asahi Kasei Kabushiki Kaisha

Asahi Kasei Chemicals Corporation

Lion Corporation

Taisei Corporation

Koichi Nagase

Shinji Ieda

Yoshifumi Araki

Kazunori Terada

Kenji Sugimoto

Yu Nitto

Yoshikimi Kondo

Jun Mikami

Takayuki Wakita

Yoshimitsu Sekiguchi

Hisho Yamada

Kimiaki Kawatani

Takehiko Kurusu

Tomoyo Okumura

Toshihiro Okada

The present invention provides a polyamide composition containing 50 to 99 parts by mass of an aliphatic polyamide (1A) formed from a diamine and a dicarboxylic acid, and 1 to 50 parts by mass of a semi-aromatic polyamide (1B) containing a dicarboxylic acid unit that includes at least 75 mol % of isophthalic acid and a diamine unit that includes at least 50 mol % of a diamine of 4 to 10 carbon atoms, wherein the tan &#x3b4; peak temperature of the polyamide composition is at least 90&#xb0; C., and the weight average molecular weight Mw of the polyamide composition satisfies 15,000&#x2264;Mw&#x2264;35,000. The invention also provides a molded article or the like formed using the polyamide composition.

Polyamide composition and molded article

A polyamide comprising a unit containing at least one (a) alicyclic dicarboxylic acid and a unit containing a (b) diamine having 8 or more carbon atoms, wherein the polyamide satisfies the following conditions (1) and (2): (1) a sulfuric acid relative viscosity &#x3b7;r at 25&#xb0; C. is 2.3 or more; and (2) Mw (weight average molecular weight)/Mn (number average molecular weight) is 4.0 or less.

Polyamide, polyamide composition, and molded article

Using a packaging material containing a fibrous substance such as pulp and a carboxyl-containing polymer a substance such as an acid type carboxymethyl cellulose, a cement mixing material such as a superplasticizer is packaged and the package is thrown into a cement formulation such as concrete, mortar or a cement paste in a truck agitator.

Package of cement mixing material

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Tokyo, Japan

Koichi Nagase