Abstract: A polyester resin containing: a diol constituent unit containing a unit a1 derived from spiroglycol represented by formula (1) and a unit a2 derived from ethylene glycol; and a dicarboxylic acid constituent unit containing a unit b derived from terephthalic acid and/or an ester thereof. A content of the unit a1 is from 5 to 60 mol % and a content of the unit a2 is from 30 to 95 mol %, based on a total amount of the unit a1 and the unit a2. A content of the unit b is from 80 to 100 mol % based on a total amount of the dicarboxylic acid constituent unit.

Abstract: A polyester resin containing: a diol constituent unit containing a unit a1 derived from spiroglycol represented by formula (1) and a unit a2 derived from ethylene glycol; and a dicarboxylic acid constituent unit containing a unit b derived from terephthalic acid and/or an ester thereof. A content of the unit a1 is from 5 to 60 mol % and a content of the unit a2 is from 30 to 95 mol %, based on a total amount of the unit a1 and the unit a2. A content of the unit b is from 80 to 100 mol % based on a total amount of the dicarboxylic acid constituent unit.

Abstract: A polyester resin containing: a diol constituent unit containing a unit a1 derived from spiroglycol represented by formula (1) and a unit a2 derived from ethylene glycol; and a dicarboxylic acid constituent unit containing a unit b derived from terephthalic acid and/or an ester thereof. A content of the unit a1 is from 5 to 60 mol % and a content of the unit a2 is from 30 to 95 mol %, based on a total amount of the unit a1 and the unit a2. A content of the unit b is from 80 to 100 mol % based on a total amount of the dicarboxylic acid constituent unit.

Abstract: A polyester resin containing: a diol constituent unit containing a unit a1 derived from spiroglycol represented by formula (1) and a unit a2 derived from ethylene glycol; and a dicarboxylic acid constituent unit containing a unit b derived from terephthalic acid and/or an ester thereof. A content of the unit a1 is from 5 to 60 mol % and a content of the unit a2 is from 30 to 95 mol %, based on a total amount of the unit a1 and the unit a2. A content of the unit b is from 80 to 100 mol % based on a total amount of the dicarboxylic acid constituent unit.

Abstract: An object of the present invention is to provide a method for producing resin pellets, in which occurrence of defective pellets is suppressed. The method for producing resin pellets of the present invention includes the following steps, and a strand-shaped resin has a diameter of 1.5 to 4.5 mm, is discharged at a take-off speed of 1.5 m/s to 10 m/s, a die has 10 or more die holes, and a strand interval X defined by Formula 2 satisfies the following Formula 1; step 1: discharging a molten thermoplastic resin through a die in the form of a strand; step 2: cooling the discharged strand-shaped resin using a refrigerant; and step 3: cutting the cooled strand-shaped resin to obtain resin pellets; 1.73×a?Xb?2.81×a??Formula 1 a=0.524, b=0.

Abstract: An object of the present invention is to provide a method for producing resin pellets, in which occurrence of defective pellets is suppressed. The method for producing resin pellets of the present invention includes the following steps, and a strand-shaped resin has a diameter of 1.5 to 4.5 mm, is discharged at a take-off speed of 1.5 m/s to 10 m/s, a die has 10 or more die holes, and a strand interval X defined by Formula 2 satisfies the following Formula 1; step 1: discharging a molten thermoplastic resin through a die in the form of a strand; step 2: cooling the discharged strand-shaped resin using a refrigerant; and step 3: cutting the cooled strand-shaped resin to obtain resin pellets; 1.73×a?Xb?2.81×a??Formula 1 a=0.524, b=0.

Abstract: The polyamide pellet of the present invention includes a polyamide including diamine units and dicarboxylic acid units, 50% by mole or more of the diamine units being derived from m-xylylenediamine, wherein a spherulite density of a skin portion of the pellet is 40,000 to 250,000/mm2.

Abstract: Provided is a method for producing a polyamide resin including reacting a dicarboxylic acid component containing sebacic acid in an amount of 50 mol % or more and a diamine component containing xylylenediamine in an amount of 70 mol % or more, wherein the total content of the specific compounds in the sebacic acid is 100 ppm by mass or less.

Abstract: A method for producing a polyamide, comprising performing melt polycondensation of a diamine component comprising xylylenediamine in an amount of 70 mol % or more and a dicarboxylic acid component comprising a linear aliphatic dicarboxylic acid having 6 to 18 carbon atoms in an amount of 70 mol % or more in the presence of a phosphorus atom-containing compound (A), wherein the decomposition temperature of the phosphorus atom-containing compound (A) is not lower than the melting point of the polyamide, and an aqueous solution of the phosphorus atom-containing compound (A) and the diamine component are added to the dicarboxylic acid component being in a molten state to perform the melt polycondensation.

Abstract: Provided are [1] a xylylenediamine composition containing xylylenediamine and a 5-membered or 6-membered heterocyclic compound (A) having at least one nitrogen-containing substituent and having two nitrogen atoms as atoms constituting a ring, wherein the content of the heterocyclic compound (A) is 0.001 to 0.02 parts by mass based on 100 parts by mass of the xylylenediamine; and [2] a method for producing a polyamide resin including the steps of introducing a 5-membered or 6-membered heterocyclic compound (A) having at least one nitrogen-containing substituent and having two nitrogen atoms as atoms constituting a ring, a diamine including xylylenediamine (but excluding a diamine corresponding to the above-mentioned heterocyclic compound (A)), and a dicarboxylic acid into a reaction system and performing a polycondensation reaction, wherein the amount of the heterocyclic compound (A) to be introduced is 0.001 to 0.02 parts by mass based on 100 parts by mass of xylylenediamine.

Abstract: Provided is a method for producing a polyamide resin including reacting a dicarboxylic acid component containing sebacic acid in an amount of 50 mol % or more and a diamine component containing xylylenediamine in an amount of 70 mol % or more, wherein the total content of the specific compounds in the sebacic acid is 100 ppm by mass or less.

Abstract: Provided are [1] a xylylenediamine composition containing xylylenediamine and 1,2-ditolylethane wherein the content of 1,2-ditolylethane is 0.001 to 0.02 parts by mass based on 100 parts by mass of the xylylenediamine; and [2] a method for producing a polyamide resin including the steps of introducing a diamine containing xylylenediamine, a dicarboxylic acid, and 1,2-ditolylethane into a reaction system and performing polycondensation reaction, wherein the amount of the 1,2-ditolylethane to be introduced is 0.001 to 0.02 parts by mass based on 100 parts by mass of the xylylenediamine.

Abstract: Provided are [1] a xylylenediamine composition containing xylylenediamine and a pyridine compound (A) having at least one substituent including an amino group, wherein the content of the pyridine compound (A) is 0.001 to 0.1 parts by mass based on 100 parts by mass of the xylylenediamine; and [2] a method for producing a polyamide resin including the steps of introducing a pyridine compound (A) having at least one substituent including an amino group, a diamine including xylylenediamine (but excluding a diamine corresponding to the above-mentioned pyridine compound (A)), and a dicarboxylic acid into a reaction system and performing a polycondensation reaction, wherein the amount of the pyridine compound (A) to be introduced is 0.001 to 0.1 parts by mass based on 100 parts by mass of xylylenediamine.

Abstract: The polyamide pellet of the present invention includes a polyamide including diamine units and dicarboxylic acid units, 50% by mole or more of the diamine units being derived from m-xylylenediamine, wherein a spherulite density of a skin portion of the pellet is 40,000 to 250,000/mm2.

Abstract: Provided are [1] a xylylenediamine composition containing xylylenediamine and a compound represented by the following general formula (1), wherein the content of the compound represented by the general formula (1) is 0.001 to 0.1 parts by mass based on 100 parts by mass of the xylylenediamine; and a method for producing a polyamide resin including the steps of introducing a compound represented by the following general formula (1), a diamine including xylylenediamine (but excluding the compound represented by the general formula (1)), and a dicarboxylic acid into a reaction system and performing a polycondensation reaction, wherein the amount of the compound represented by the general formula (1) to be introduced is 0.001 to 0.1 parts by mass based on 100 parts by mass of the xylylenediamine, where, in the general formula (1), n and m each independently represent an integer of 0 to 6, excluding the case where n and m are both 1.

Abstract: A method for producing a polyamide, comprising performing melt polycondensation of a diamine component comprising xylylenediamine in an amount of 70 mol % or more and a dicarboxylic acid component comprising a linear aliphatic dicarboxylic acid having 6 to 18 carbon atoms in an amount of 70 mol % or more in the presence of a phosphorus atom-containing compound (A), wherein the decomposition temperature of the phosphorus atom-containing compound (A) is not lower than the melting point of the polyamide, and an aqueous solution of the phosphorus atom-containing compound (A) and the diamine component are added to the dicarboxylic acid component being in a molten state to perform the melt polycondensation.

Abstract: Provided are a xylylenediamine composition containing xylylenediamine and bis(methylbenzyl)amine, a content of the bis(methylbenzyl)amine being 0.0005 to 0.1 parts by mass based on 100 parts by mass of the xylylenediamine; and a method for producing a polyamide resin including the steps of introducing a diamine containing xylylenediamine, a dicarboxylic acid, and bis(methylbenzyl)amine in an amount of 0.0005 to 0.1 parts by mass based on 100 parts by mass of the xylylenediamine into a reaction system and performing a polycondensation reaction.

Abstract: Provided are [1] a xylylenediamine composition containing xylylenediamine and a compound represented by the following general formula (1), wherein the content of the compound represented by the general formula (1) is 0.001 to 0.1 parts by mass based on 100 parts by mass of the xylylenediamine; and a method for producing a polyamide resin including the steps of introducing a compound represented by the following general formula (1), a diamine including xylylenediamine (but excluding the compound represented by the general formula (1)), and a dicarboxylic acid into a reaction system and performing a polycondensation reaction, wherein the amount of the compound represented by the general formula (1) to be introduced is 0.001 to 0.1 parts by mass based on 100 parts by mass of the xylylenediamine, where, in the general formula (1), n and m each independently represent an integer of 0 to 6, excluding the case where n and m are both 1.

Abstract: Provided are [1] a xylylenediamine composition containing xylylenediamine and a 5-membered or 6-membered heterocyclic compound (A) having at least one nitrogen-containing substituent and having two nitrogen atoms as atoms constituting a ring, wherein the content of the heterocyclic compound (A) is 0.001 to 0.02 parts by mass based on 100 parts by mass of the xylylenediamine; and [2] a method for producing a polyamide resin including the steps of introducing a 5-membered or 6-membered heterocyclic compound (A) having at least one nitrogen-containing substituent and having two nitrogen atoms as atoms constituting a ring, a diamine including xylylenediamine (but excluding a diamine corresponding to the above-mentioned heterocyclic compound (A)), and a dicarboxylic acid into a reaction system and performing a polycondensation reaction, wherein the amount of the heterocyclic compound (A) to be introduced is 0.001 to 0.02 parts by mass based on 100 parts by mass of xylylenediamine.

Abstract: Provided are [1] a xylylenediamine composition containing xylylenediamine and a pyridine compound (A) having at least one substituent including an amino group, wherein the content of the pyridine compound (A) is 0.001 to 0.1 parts by mass based on 100 parts by mass of the xylylenediamine; and [2] a method for producing a polyamide resin including the steps of introducing a pyridine compound (A) having at least one substituent including an amino group, a diamine including xylylenediamine (but excluding a diamine corresponding to the above-mentioned pyridine compound (A)), and a dicarboxylic acid into a reaction system and performing a polycondensation reaction, wherein the amount of the pyridine compound (A) to be introduced is 0.001 to 0.1 parts by mass based on 100 parts by mass of xylylenediamine.