Object: To provide a resin composition having excellent oxygen barrier properties and transparency, and high tensile elongation at break; a molded article, a film, and a multilayer film. Resolution means: A resin composition including from 20 to 80 parts by mass of a polyamide resin (A) and from 80 to 20 parts by mass of a polyamide resin (B); wherein more than 35 mol % of all the constituent units of the polyamide resin (A) are constituent units including an alkylene chain having from 2 to 6 carbons; the polyamide resin (B) includes constituent units derived from a diamine and constituent units derived from a dicarboxylic acid, wherein 70 mol % or more of the constituent units derived from a diamine are derived from a xylylenediamine; from 30 to 70 mol % of the constituent units derived from a dicarboxylic acid are derived from an α,ω-linear aliphatic dicarboxylic acid having from 4 to 8 carbons; from 70 to 30 mol % of the constituent units derived from a dicarboxylic acid are derived from isophthalic acid, with the proviso that the total does not exceed 100 mol %; and the polyamide resin (B) further includes phosphorus atoms in a ratio of 3 to 300 mass ppm, and calcium atoms so as to be the ratio that phosphorus atoms:calcium atoms of 1:0.3 to 0.7.

Object: To provide a resin composition having excellent oxygen barrier properties and transparency, and high tensile elongation at break; a molded article, a film, and a multilayer film. Resolution means: A resin composition including from 20 to 80 parts by mass of a polyamide resin (A) and from 80 to 20 parts by mass of a polyamide resin (B); wherein more than 35 mol % of all the constituent units of the polyamide resin (A) are constituent units including an alkylene chain having from 2 to 6 carbons; the polyamide resin (B) includes constituent units derived from a diamine and constituent units derived from a dicarboxylic acid, wherein 70 mol % or more of the constituent units derived from a diamine are derived from a xylylenediamine; from 30 to 70 mol % of the constituent units derived from a dicarboxylic acid are derived from an α,ω-linear aliphatic dicarboxylic acid having from 4 to 8 carbons; from 70 to 30 mol % of the constituent units derived from a dicarboxylic acid are derived from isophthalic acid, with the proviso that the total does not exceed 100 mol %; and the polyamide resin (B) further includes phosphorus atoms in a ratio of 3 to 300 mass ppm, and calcium atoms so as to be the ratio that phosphorus atoms:calcium atoms of 1:0.3 to 0.7.

A transparent polyamide moulding with high resistance to steam, containing at least one copolyamide with polyamide units AB/AC/D, wherein: (A) is selected as a cycloaliphatic diamine from the group: MACM and PACM; (B) is selected as an aromatic dicarboxylic acid from the group: isophthalic acid (I), naphthalenedicarboxylic acid, and terephthalic acid (T); (C) is selected as an aliphatic dicarboxylic acid from the group: decanedioic acid, undecanedioic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, pentadecanedioic acid, hexadecanedioic acid; and (D) is selected as at least one lactam or α,ω-aminocarboxylic acid from the group: laurolactam, undecanolactam, 12-aminododecanoic acid, and 11-aminoundecanoic acid, wherein: the proportions of polyamide units AB are from 30 to 45 mol %, the proportions of polyamide units AC are from 30 to 40 mol %, and the proportions of polyamide units D are from 20 to 32 mol %, and wherein the sum total of polyamide units AB, AC and D is 100 mol %.

A transparent polyamide moulding with high resistance to steam, containing at least one copolyamide with polyamide units AB/AC/D, wherein: (A) is selected as a cycloaliphatic diamine from the group: MACM and PACM; (B) is selected as an aromatic dicarboxylic acid from the group: isophthalic acid (I), naphthalenedicarboxylic acid, and terephthalic acid (T); (C) is selected as an aliphatic dicarboxylic acid from the group: decanedioic acid, undecanedioic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, pentadecanedioic acid, hexadecanedioic acid; and (D) is selected as at least one lactam or α,ω-aminocarboxylic acid from the group: laurolactam, undecanolactam, 12-aminododecanoic acid, and 11-aminoundecanoic acid, wherein: the proportions of polyamide units AB are from 30 to 45 mol %, the proportions of polyamide units AC are from 30 to 40 mol %, and the proportions of polyamide units D are from 20 to 32 mol %, and wherein the sum total of polyamide units AB, AC and D is 100 mol %.

The present disclosure relates to a polyamide block copolymer and a polyamide film including the same. The polyamide block copolymer according to the present disclosure makes it possible to provide a polyamide film exhibiting excellent mechanical properties while being colorless and transparent.

A transparent polyimide mixture is disclosed. The transparent polyimide mixture includes a transparent polyimide, an additive, and a solvent. A molecular chain of the transparent polyimide includes an active hydrogen atom. The additive includes a carbodiimide group. An equivalent ratio of the active hydrogen atom and the carbodiimide group is in a range of 1:0.8 to 1:1.2. A method for preparing the transparent polyimide mixture, a transparent polyimide film, and a method for preparing a transparent polyimide film are also disclosed.

A transparent polyimide mixture is disclosed. The transparent polyimide mixture includes a transparent polyimide, an additive, and a solvent. A molecular chain of the transparent polyimide includes an active hydrogen atom. The additive includes a carbodiimide group. An equivalent ratio of the active hydrogen atom and the carbodiimide group is in a range of 1:0.8 to 1:1.2. A method for preparing the transparent polyimide mixture, a transparent polyimide film, and a method for preparing a transparent polyimide film are also disclosed.

A polymer dispersion is disclosed. The polymer dispersion includes a liquid crystal polymer powder, a polyamide acid, and a solvent. A solid content of the polymer dispersion includes the liquid crystal polymer powder and the polyamide acid. The liquid crystal polymer powder has a mass ratio of 20% to 30% in the solid content. The polyamide acid has a mass ratio of 70% to 80% in the solid content. The polyamide acid is obtained by mixing two kinds of diamines and two kinds of dianhydrides together, causing the diamines and the dianhydrides to be polymerized with each other. Both two kinds of diamines and two kinds of dianhydrides comprise a liquid crystal structure and a flexible structure respectively. A method of preparing the polymer dispersion, and a method for preparing a polymer composite film using the polymer dispersion are also disclosed.

A polymer dispersion is disclosed. The polymer dispersion includes a liquid crystal polymer powder, a polyamide acid, and a solvent. A solid content of the polymer dispersion includes the liquid crystal polymer powder and the polyamide acid. The liquid crystal polymer powder has a mass ratio of 20% to 30% in the solid content. The polyamide acid has a mass ratio of 70% to 80% in the solid content. The polyamide acid is obtained by mixing two kinds of diamines and two kinds of dianhydrides together, causing the diamines and the dianhydrides to be polymerized with each other. Both two kinds of diamines and two kinds of dianhydrides comprise a liquid crystal structure and a flexible structure respectively. A method of preparing the polymer dispersion, and a method for preparing a polymer composite film using the polymer dispersion are also disclosed.

A method for manufacturing a thick polyimide film includes providing a first and second laminated structures. The first and second laminated structures are heated, and the heated first and second laminated structures are wound together to form a third laminated structure. The first polyamic acid gel film of the heated first laminated structure and the second polyamic acid gel film of the heated second laminated structure are overlapped and bonded together to form a third polyamic acid gel film. Two third laminated structures are wound together to form a fourth polyamic acid gel film. A dehydration ring-closure imidization reaction is applied to the fourth polyamic acid gel film by heating to obtain the thick polyimide film. A thick polyimide film manufactured by the method is also disclosed.