Semiaromatic polyamide resin composition

A semiaromatic polyamide resin composition consisting essentially of

• (A) a copolyamide formed of a recurring unit of a dicarboxylic acid component unit and a diamine component unit, at least 45 mol % of said dicarboxylic acid component unit being a terephthalic acid component unit, and said diamine component unit consisting essentially of 55 to 99 mol % of a straight-chain alkylenediamine component unit having 4 to 18 carbon atoms and 1 to 45 mol % and an alkylenediamine component unit having a side-chain alkyl group and 4 to 18 carbon atoms, wherein said copolyamide (A) contains an aromatic carboxylic acid unit other than the terephthalic acid and/or an aliphatic dicarboxylic acid unit having 4 to 20 carbon atoms in an amount of not larger than 55 mol % per the whole dicarboxylic acid units;
• (B) an aliphatic polyamide containing not smaller than 50 mol % of the total amount of at least one unit selected from the group consisting of (i) a unit derived from a lactam having 12 carbon atoms, (ii) a unit derived from an aminocarboxylic acid having 12 carbon atoms and (iii) a unit derived from a dodecanoic diacid and a diamine;
• and
• (C) at least one graft-modified product selected from the group consisting of a graft-modified product of an ethylene/α-olefin copolymer, wherein said α-olefin has 3 to 20 carbon atoms, a graft-modified product of an aromatic vinyl compound/conjugated diene copolymer, and a graft-modified product of a hydrogenated product of the aromatic vinyl compound/conjugated diene copolymer;
• said component (A) being contained in an amount of from 98 to 65% by weight, said component (B) being contained in an amount of from 1 to 10% by weight, and said component (C) being contained in an amount of from 1 to 25% by weight per the sum of the components (A), (B) and (C).

A semiaromatic polyamide resin composition comprising

• (A) a copolyamide consisting essentially of (1) recurring units of a dicarboxylic acid component unit and (2) recurring units of a diamine component unit,
• (1) wherein at least 45 mol % of said dicarboxylic acid component unit being a terephthalic acid component unit and contains an aromatic carboxylic acid unit other than the terephthalic acid and/or an aliphatic dicarboxylic acid unit having 4 to 20 carbon atoms in an amount of not larger than 55 mol % per the whole dicarboxylic acid units, and
• (2) wherein said diamine component unit consists essentially of 55 to 99 mol % of a straight-chain alkylenediamine component unit having 4 to 18 carbon atoms and 1 to 45 mol % of an alkylenediamine component unit having a side-chain alkyl group and 4 to 18 carbon atoms;
• (B) an aliphatic polyamide containing not smaller than 50 mol % of the total amount of at least one unit selected from the group consisting of (i) a unit derived from a lactam having 12 carbon atoms, (ii) a unit derived from an aminocarboxylic acid having 12 carbon atoms and (iii) a unit derived from a dodecanoic diacid and a dianine;
• and
• (C) at least one graft-modified product selected from the group consisting of a graft-modified product of an ethylene/a-olefin copolymer, wherein said α-olefin has 3 to 20 carbon atoms, a graft-modified product of an aromatic vinyl compound/conjugated diene copolymer, and a graft-modified product of a hydrogenated product of the aromatic vinyl compound/conjugated diene copolymer;
• said component (A) being contained in an amount of from 98 to 65% by weight, said component (B) being contained in an amount of from 1 to 10% by weight, and said component (C) being contained in an amount of from 1 to 25% by weight per the sum of the components (A), (B) and (C).