Toyo Boseki Kabushiki Kaisha

Toyobo Co., Ltd.

Toyoda Gosei Co., Ltd.

Tomohide Nakagawa

Toshio Hiramatsu

Manabu Takeuchi

Hideki Eguchi

Tutomu Tamura

Tsutomu Tamura

Tatsuya Oi

Junji Koizumi

Haruyasu Mizutani

Gaku Maruyama

Katsushi Ito

Yasuto Fujii

Daisuke Tsutsumi

Tadamine Ohashi

Kazunari Tanaka

Akio Tange

Shoji Kouketsu

Yoshinobu Hanaoka

The present invention is a crystalline polyamide resin composition, comprising 100 parts by mass of a crystalline polyamide resin and 1 to 10 part(s) by mass of a modified polyolefin resin. The crystalline polyamide resin composition of the present invention can provide a molded product which has so excellent sliding durability that changes in surface appearance against repeated slidings for tens of thousands times with high load are small and which has excellent mechanical strength and moldability, while keeping excellent characteristics inherent to a crystalline polyamide resin.

Crystalline polyamide resin composition

The present invention provides a polyamide resin composition having high melt point which can produce a molded product having high anti-vibration property or, in other words, having very high resonance frequency and, in particular, being capable of retaining high resonance frequency even upon water absorption. A polyamide resin composition, comprising a polyamide resin (A) having melt point (Tm) of 290&#xb0; C. to 350&#xb0; C. and having crystallization temperature upon temperature rise (Tc) of 80 to 150&#xb0; C., and glass fibers (B) having cross-sectional area of 1.5 to 5.0&#xd7;10cm, characterized in that, ratio by weight of the polyamide resin (A) to the glass fibers (B) [(A):(B)] is from 20:80 to 35:65, and that the polyamide resin (A) is a copolymerized polyamide consisting of 55 to 75 molar % of a constituent unit (a) obtained from an equimolar salt of hexamethylenediamine and terephthalic acid, and 45 to 25 molar % of a constituent unit (b) obtained from 11-aminoundecanoic acid or undecane lactam.

Polyamide resin composition having high melt point and being excellent in anti-vibration property upon water absorption

The present invention provides a polyamide resin composition reinforced with glass fiber which can produce a molded product having high anti-vibration property or, in other words, having very high resonance frequency and having, upon necessity, excellent weather-resisting color fastness. A polyamide resin composition reinforced with glass fiber, comprising a polyamide resin (A) constituted from aliphatic polyamide (a1) and aromatic component-containing polyamide (a2), and glass fibers (B) having a cross-sectional area of 1.5 to 5.0&#xd7;10cm, wherein ratio by weight of the polyamide resin (A) to the glass fibers (B) [(A):(B)] is from 20:80 to 35:65 and ratio by weight of the aliphatic polyamide (a1) to the aromatic component-containing polyamide (a2) [(a1):(a2)] is from 5:95 to 95:5. The polyamide resin composition reinforced with glass fibers of the present invention can further comprise carbon black (C) in an amount of at most 5% by weight.

Polyamide resin composition reinforced with glass fiber

Provided is a polyamide resin composition which can provide an expanded molding being superior in heat resistance and sufficiently reduced in weight and having high load resistance by a simple molding process. The polyamide resin composition is characterized by comprising a polyamide resin (A), a glycidyl-group-containing styrene copolymer (B) having two or more glycidyl groups per molecule, a weight average molecular weight of 4000 to 25000 and an epoxy value of 400 to 2500 Eq/1&#xd7;10g and an inorganic reinforcing material (C) in a proportion such that the content of the glycidyl-group-containing styrene copolymer (B) is 0.2 to 25 parts by mass and the content of the inorganic reinforcing material (C) is 0 to 350 parts by mass relative to 100 parts by mass of the polyamide resin (A).

Polyamide resin composition, expanded polyamide resin molding, and automotive resin molding

There is provided a polyamide resin composition reinforced with glass fiber produced by the melt kneading of a mixture where 60 to 80 parts by weight of glass fiber bundles (B) comprising a glass fiber having a flat cross section whose flatness degree is 1.5 to 8 and having an ignition loss at 625&#xb0; C. for 0.5 hour of not more than 0.8% by weight are added to 40 to 20 parts by weight of polyamide (A), characterized in that, during the above melt kneading, a polyamide-reactive silane coupling agent (C) is added to the above mixture in a rate of 0.1 to 1.0% by weight of the above glass fiber bundles (B). The polyamide resin composition of the present invention has high bending strength, bending elastic modulus and Charpy impact strength (at 23&#xb0; C. and &#x2212;40&#xb0; C.) by a specific fracture mode which have been never achieved before, and it is excellent in productivity.

A material for fuel-system parts which is excellent in impact strength, rigidity, elongation, unsusceptibility to swelling with liquid fuels including gasoline, and gasoline-barrier properties and has satisfactory moldability. The material for fuel-system parts comprises a resin composition comprising 100 parts by weight of a given polyamide resin (A) and 11 to 100 parts by weight of a resin (B) having a lower glass transition temperature than the polyamide resin (A) and having a functional group reactive with the polyamide resin (A), and has a structure in which the polyamide resin (A) serves as a matrix ingredient and the resin (B) serves as a domain ingredient.

Material for fuel-system part and fuel-system part comprising the same

It is disclosed that a coated polyamide molding product, characterized in that, a polyamide molding product obtained from a polyamide resin composition containing a polyamide resin (A), a thermoplastic resin composition (B) having functional groups reacting with the polyamide resin and, if necessary, an inorganic filler (C) is coated with a thermoplastic resin elastomer (D) which is compatible with the thermoplastic resin composition which is the above-mentioned component (B).

Coated polyamide molding products

There is disclosed an inorganic reinforced polyamide resin compositions obtainable by melt kneading of (A) a crystalline polyamide rein, (B) a semi-aromatic amorphous polyamide resin, and (C) an inorganic reinforcing material, wherein the relative viscosity of 96% sulfuric acid solution of the composition is 2.1 or lower and wherein the crystallization temperature (TC ) of the composition as measured with a temperature drop by differential scanning calorimetry (DSC) is 180&deg; C. or lower. The inorganic reinforced polyamide resin composition can provide shaped articles having satisfactory strength and rigidity without deteriorating their appearances further having excellent coating properties and weathering resistance, and requires a mold temperature of 100&deg; C. or lower in the preparation of shaped articles.

Inorganic reinforced polyamide resin compositions

There is disclosed an inorganic reinforced polyamide resin compositions obtainable by melt kneading of (A) a crystalline polyamide rein, (B) a semi-aromatic amorphous polyamide resin, and (C) an inorganic reinforcing material, wherein the relative viscosity of 96% sulfuric acid solution of the composition is 2.1 or lower and wherein the crystallization temperature (TC2) of the composition as measured with a temperature drop by differential scanning calorimetry (DSC) is 180&deg; C. or lower. The inorganic reinforced polyamide resin composition can provide shaped articles having satisfactory strength and rigidity without deteriorating their appearances and further having excellent coating properties and weathering resistance, and requires a mold temperature of 100&deg; C. or lower in the preparation of shaped articles.

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Otsu, Japan

Tomohide Nakagawa