Polyamide resin composition, molded article obtained by molding same, and methods for producing those

A method for producing a polyamide resin composition compounded with 0.01-12 parts by weight of a silicone resin (B), 0.01-5 parts by weight of a silane coupling agent (C) having at least one functional group selected from the group consisting of an isocyanate group, an epoxy group, and an acid anhydride group, with respect to 100 parts by weight of a polyamide resin (A), and 0.01 to 5 parts by weight of an ammonium salt (D) comprising a dicarboxylic acid having a carbon number of 6 to 12 and ammonia, comprising the steps of:

• separating a silicone resin layer from a polyamide resin composite in which the silicone resin layer is formed on a surface of a polyamide resin molded body, so that 0.01 to 12 parts by weight of the silicone resin layer is left with respect to 100 parts by weight of a polyamide resin;
• once making the polyamide resin composite from which the silicone resin layer has been separated into pellets or chopped pieces of a composition (AB), or directly subjecting the polyamide resin composite from which the silicone resin layer has been separated to the subsequent melt-kneading step without intermediate processing;
• and
• melt-kneading 0.01 to 5 parts by weight of a silane coupling agent (C) having at least one functional group selected from the group consisting of an isocyanate group, an epoxy group, and an acid anhydride group, and 0.01 to 5 parts by weight of an ammonium salt (D) comprising a dicarboxylic acid having a carbon number of 6 to 12 and ammonia, to the pellets or chopped pieces, or to the unprocessed polyamide resin composite from the previous step, where the silane coupling agent chemically interacts with the polyamide resin (A) and the silicone resin (B) to fix the silicone resin (B) to the polyamide resin (A).

A method for producing a polyamide resin composition compounded with 0.01-12 parts by weight of a silicone resin (B), 0.01-5 parts by weight of a silane coupling agent (C) having at least one functional group selected from the group consisting of an isocyanate group, an epoxy group, and an acid anhydride group, with respect to 100 parts by weight of a polyamide resin (A), and 0.01 to 5 parts by weight of an acid anhydride (E), comprising the steps of:

• separating a silicone resin layer from a polyamide resin composite in which the silicone resin layer is formed on a surface of a polyamide resin molded body, so that 0.01 to 12 parts by weight of the silicone resin layer is left with respect to 100 parts by weight of a polyamide resin;
• once making the polyamide resin composite from which the silicone resin layer has been separated into pellets or chopped pieces of a composition (AB), or directly subjecting the polyamide resin composite from which the silicone resin layer has been separated to the subsequent melt-kneading step without intermediate processing;
• and
• melt-kneading 0.01 to 5 parts by weight of a silane coupling agent (C) having at least one functional group selected from the group consisting of an isocyanate group, an epoxy group, and an acid anhydride group, and 0.01 to 5 parts by weight of an acid anhydride (E), to the pellets or chopped pieces, or to the unprocessed polyamide resin composite from the previous step, where the silane coupling agent chemically interacts with the polyamide resin (A) and the silicone resin (B) to fix the silicone resin (B) to the polyamide resin (A).