Abstract: Provided are a filament having, after a water absorption treatment, a high maintenance rate of linear strength and a high maintenance rate of knot strength, and a fishing line. The filament contains a polyamide resin (A), and the polyamide resin (A) is constituted from a constituent unit derived from a diamine and a constituent unit derived from a dicarboxylic acid, and 70 mol % or more of the constituent units derived from a diamine are derived from xylylene diamine, and 70 mol % or more of the constituent units derived from a dicarboxylic acid are derived from an ?,?-linear aliphatic dicarboxylic acid having from 11 to 14 carbons.

Abstract: Provided is an amorphous polyamide resin that has a small weight change rate under hot and humid conditions and that can maintain a good appearance even when formed into a molded article and placed under hot and humid conditions. Also provided is a molded article including the amorphous polyamide resin. An amorphous polyamide resin includes: constituent units derived from a diamine and constituent units derived from a dicarboxylic acid, not less than 70 mol % of the constituent units derived from a diamine being constituent units derived from isophoronediamine, the constituent units derived from a dicarboxylic acid including constituent units derived from an ?,?-straight chain aliphatic dicarboxylic acid having from 8 to 14 carbons and constituent units derived from an aromatic dicarboxylic acid.

Abstract: There is provided a low-viscosity resin composition having high mechanical strength when formed into a molded article and having excellent fluidity, and a molded article formed from the resin composition.

Abstract: To provide a polyamide resin composition preventing mold fouling during molding and capable of producing a molded product with an excellent color tone, as well as a molded product, a method for producing a molded product, and an antioxidant. The composition is a resin composition containing: a polyamide resin constituted of diamine-derived constituent units and dicarboxylic acid-derived constituent units, 70 mol % or more of the diamine-derived constituent units being derived from a compound represented by Formula (1), and 70 mol % or more of the dicarboxylic acid-derived constituent units being derived from an ?,?-linear aliphatic dicarboxylic acid having from 8 to 12 carbon atoms; and a compound represented by Formula (1), where R1 and R2 each independently represent an alkyl group having from 1 to 4 carbon atoms, and n1 and n2 are each independently an integer from 0 to 4, wherein a content of the compound represented by Formula (1) is from 3 to 100 mass ppm of the resin composition.

Abstract: Provide is a polyamide resin that can yield a molded article with good appearance and good solder reflowability, while keeping low water absorption rate; a molded article; and a method for manufacturing a polyamide resin. The polyamide resin, which is composed of a structural unit derived from diamine and a structural unit derived from dicarboxylic acid; 70 mol % or more of the structural unit derived from diamine being derived from 1,4-bis(aminomethyl)cyclohexane, 1,4-bis(aminomethyl)cyclohexane having a molar ratio (cis:trans) of 35:65 to 0:100, 70 mol % or more of the structural unit derived from dicarboxylic acid being derived from a straight chain aliphatic ?,?-dicarboxylic acid having 8 to 12 carbon atoms, the polyamide resin containing 20 to 100 ppm by mass of phosphorus atom, and containing calcium atom so that the molar ratio given by (phosphorus atom):(calcium atom) will be 1:0.3 to 0.7.

Abstract: Provided is a method for producing an amorphous polyamide resin whereby the production of foreign matter in the resin can be suppressed or avoided when producing an amorphous polyamide resin having a constituent unit derived from isophoronediamine, a constituent unit derived from an ?,?-linear aliphatic dicarboxylic acid having from 8 to 14 carbons, and a constituent unit derived from an aromatic dicarboxylic acid.

Abstract: Provided is a method for producing an amorphous polyamide resin whereby the production of foreign matter in the resin can be suppressed or avoided when producing an amorphous polyamide resin having a constituent unit derived from isophoronediamine, a constituent unit derived from an ?,?-linear aliphatic dicarboxylic acid having from 8 to 14 carbons, and a constituent unit derived from an aromatic dicarboxylic acid. The method for producing an amorphous polyamide resin including subjecting a diamine component and a dicarboxylic acid component to melt polycondensation reaction in the presence of a phosphorus atom-containing compound, the diamine component including 70 mol % or more of isophoronediamine, and the dicarboxylic acid component including an ?,?-linear aliphatic dicarboxylic acid having from 8 to 14 carbons and an aromatic dicarboxylic acid.

Abstract: Provided is a polyamide resin composition capable of providing a molded article having an excellent wear resistance while maintaining a high mechanical strength; a molded article; and a method for manufacturing a polyamide resin pellet. The polyamide resin composition includes a polyamide resin and an inorganic filler, wherein the polyamide resin includes diamine-derived constituent units and dicarboxylic acid derived constituent units; 70 mol % or more of the diamine-derived constituent units are derived from 1,4-bis(aminomethyl)cyclohexane; a molar ratio of cis:trans of the 1,4-bis(aminomethyl)cyclohexane is from 35:65 to 0:100; 70 mol % or more of the dicarboxylic acid-derived constituent units are derived from an ?,?-linear aliphatic dicarboxylic acid having from 8 to 12 carbons; and the polyamide resin includes phosphorus atoms in a ratio of from 20 to 100 mass ppm and comprises calcium atoms so as to be phosphorus atoms:calcium atoms of 1:0.3 to 0.7 in a molar ratio.

Abstract: There is provided a low-viscosity resin composition having high mechanical strength when formed into a molded article and having excellent fluidity, and a molded article formed from the resin composition.

Abstract: Provide is a polyamide resin that can yield a molded article with good appearance and good solder reflowability, while keeping low water absorption rate; a molded article; and a method for manufacturing a polyamide resin. The polyamide resin, which is composed of a structural unit derived from diamine and a structural unit derived from dicarboxylic acid; 70 mol % or more of the structural unit derived from diamine being derived from 1,4-bis(aminomethyl)cyclohexane, 1,4-bis(aminomethyl)cyclohexane having a molar ratio (cis:trans) of 35:65 to 0:100, 70 mol % or more of the structural unit derived from dicarboxylic acid being derived from a straight chain aliphatic ?,?-dicarboxylic acid having 8 to 12 carbon atoms, the polyamide resin containing 20 to 100 ppm by mass of phosphorus atom, and containing calcium atom so that the molar ratio given by (phosphorus atom):(calcium atom) will be 1:0.3 to 0.7.

Abstract: Provided is a polyamide resin composition capable of providing a molded article having an excellent wear resistance while maintaining a high mechanical strength; a molded article; and a method for manufacturing a polyamide resin pellet. The polyamide resin composition includes a polyamide resin and an inorganic filler, wherein the polyamide resin includes diamine-derived constituent units and dicarboxylic acid derived constituent units; 70 mol % or more of the diamine-derived constituent units are derived from 1,4-bis(aminomethyl)cyclohexane; a molar ratio of cis:trans of the 1,4-bis(aminomethyl)cyclohexane is from 35:65 to 0:100; 70 mol % or more of the dicarboxylic acid-derived constituent units are derived from an ?,?-linear aliphatic dicarboxylic acid having from 8 to 12 carbons; and the polyamide resin includes phosphorus atoms in a ratio of from 20 to 100 mass ppm and comprises calcium atoms so as to be phosphorus atoms:calcium atoms of 1:0.3 to 0.7 in a molar ratio.

Abstract: Provided is an amorphous polyamide resin that has a small weight change rate under hot and humid conditions and that can maintain a good appearance even when formed into a molded article and placed under hot and humid conditions. Also provided is a molded article including the amorphous polyamide resin. An amorphous polyamide resin includes: constituent units derived from a diamine and constituent units derived from a dicarboxylic acid, not less than 70 mol % of the constituent units derived from a diamine being constituent units derived from isophoronediamine, the constituent units derived from a dicarboxylic acid including constituent units derived from an ?,?-straight chain aliphatic dicarboxylic acid having from 8 to 14 carbons and constituent units derived from an aromatic dicarboxylic acid.

Abstract: Provided is a polyamide resin with high transparency and high heat aging resistance. The polyamide resin contains a diamine-derived structural unit and a dicarboxylic acid-derived structural unit, the diamine-derived structural unit being such that 70 mol % or more thereof is derived from 1,3-bis(aminomethyl)cyclohexane, and the dicarboxylic acid-derived structural unit being such that 10 to 90 mol % thereof is derived from isophthalic acid, 90 to 10 mol % of thereof is derived from a straight chain aliphatic dicarboxylic acid having 8 to 12 carbon atoms, and the dicarboxylic acid-derived structural unit containing substantially no terephthalic acid-derived structural unit.

Abstract: Provide is a molded product showing low water absorption, high chemical resistance, high crystallinity index. A molded product formed from a polyamide resin composition containing 50 to 99 parts by mass of (A) an aliphatic polyamide resin and 50 to 1 parts by mass of (B) a polyamide resin including 70 mol % or more of a diamine structural unit derived from xylylenediamine and 50 mol % or more of a dicarboxylic acid structural unit derived from sebacic acid, provided that the total of (A) and (B) is 100 parts by mass.

Abstract: Provided is a polyamide resin having high heat resistance, excellent moldability and excellent mechanical properties. The polyamide resin comprises a diamine unit containing 70 mol % or more of a xylylenediamine unit and a dicarboxylic acid unit containing 70 mol % or more of a straight chain aliphatic dicarboxylic acid unit, wherein the xylylenediamine unit is composed of 50 to 95 mol % of p-xylylenediamine and 50 to 5 mol % of m-xylylenediamine; the straight chain aliphatic dicarboxylic acid unit is composed of 50 to 100 mol % of adipic acid and 0 to less than 50 mol % of sebacic acid or other straight chain aliphatic dicarboxylic acids; the molar ratio of reacted diamine units to reacted dicarboxylic acid units (the number of moles of reacted diamine units/the number of moles of reacted dicarboxylic acid units) is less than 0.994; and the polyamide resin has a number average molecular weight of 10,000 to 25,000 and a melting point of 285° C. or more.

Abstract: Provided is a polyamide resin having high heat resistance, excellent moldability and excellent mechanical properties. The polyamide resin comprises a diamine unit containing 70 mol % or more of a xylylenediamine unit and a dicarboxylic acid unit containing 70 mol % or more of a straight chain aliphatic dicarboxylic acid unit, wherein the xylylenediamine unit is composed of 50 to 95 mol % of p-xylylenediamine and 50 to 5 mol % of m-xylylenediamine; the straight chain aliphatic dicarboxylic acid unit is composed of 50 to 100 mol % of adipic acid and 0 to less than 50 mol % of sebacic acid or other straight chain aliphatic dicarboxylic acids; the molar ratio of reacted diamine units to reacted dicarboxylic acid units (the number of moles of reacted diamine units/the number of moles of reacted dicarboxylic acid units) is less than 0.994; and the polyamide resin has a number average molecular weight of 10,000 to 25,000 and a melting point of 285° C. or more.