Asahi Kasei Chemicals Corporation

Asahi Kasei Kabushiki Kaisha

Shinji Ieda

Yu Nitto

Kazunori Terada

Masaaki Aramaki

Yasukazu Shikano

Hiroki Matsui

Teruaki Sakuma

Koichi Nagase

Yoshifumi Araki

Jun Mikami

Yoshikimi Kondo

Hiroharu Itaya

Takayuki Wakita

Yoshinori Fujino

Tomoyo Okumura

Hisho Yamada

Kimiaki Kawatani

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

An object of the present invention is to provide a copolymer polyamide which has excellent strength, high-temperature strength, low water absorbance, low blocking properties, releasability and plasticizing time stability, and a copolymer polyamide composition which has excellent vibration fatigue characteristics, surface appearance and continuous productivity. A copolymer polyamide of the present invention is obtained by polymerizing (a) at least one alicyclic dicarboxylic acid, (b) one diamine having 8 or more carbon atoms, and (c) at least one copolymer component selected from the group consisting of the following (c-1) to (c-3): a (c-1) dicarboxylic acid other than the alicyclic dicarboxylic acid; a (c-2) diamine having fewer carbon atoms than the (b) diamine; and a (c-3) lactam and/or aminocarboxylic acid, and the copolymer polyamide satisfies specific conditions.

Copolymer polyamide

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

The present invention relates to a polyamide obtainable by polymerizing an (a) dicarboxylic acid comprising at least 50 mol % of an alicyclic dicarboxylic acid and a (b) diamine comprising at least 50 mol % of a diamine having a substituent branched from a main chain.

Polyamide, polyamide composition, and method for producing polyamide

(Problems to be solved) Provision of a polyamide composition with good heat resistance, stability under heating, heat resistant color tone stability, reflow heat resistance properties and fogging properties. (Solution) A polyamide obtained by polymerizing (a) a dicarboxylic acid containing at least 50 mol % of an alicyclic dicarboxylic acid and (b) a diamine containing at least 50 mol % of a diamine having a pentamethylenediamine skeleton,

Polyamide and polyamide composition

[Problem to be Solved] To provide a polyamide having a high melting point, which has excellent strength, toughness, and stability under heating. [Solution] This polyamide is obtained by polymerizing an (a) dicarboxylic acid comprising at least 50 mol % of an alicyclic dicarboxylic acid and a (b) diamine comprising at least 50 mol % of a diamine having a pentamethylenediamine skeleton, wherein the polyamide has a cyclic amino end amount of 30 to 60&#x3bc; equivalents/g.

A thermoplastic resin composition comprising: 20 to 60 parts by mass of a styrene-based resin (A) in which a content of an unsaturated nitrile-based monomer is from 32 to 50 mass %; 20 to 60 parts by mass of an aromatic polyester (B) in which an isothermal crystallization time from the molten state is from 25 to 100 sec; and 20 to 60 parts by mass of a filler (C).

Growing community of inventors

Tokyo, Japan

Shinji Ieda