A method for producing a resin composition of the present invention is a method for producing a resin composition, the method including a step of obtaining a resin composition by heating and melt-kneading a mixture containing a particulate nucleating agent in which D.sub.50 is equal to or more than 0.1 μm and equal to or less than 300 μm and a thermoplastic resin using a twin screw extruder (100) including, inside a cylinder (10), a screw (50) having kneading discs (60), in which the step of obtaining a resin composition includes an extrusion step of extruding the mixture supplied into the twin screw extruder (100) in an ejection direction under kneading conditions in which X and Y satisfy 4.0≤X in a range of 6.0×10.sup.3≤Y≤7.0×10.sup.4 when a volume-based ejection amount is denoted by X (10.sup.−6.Math.kg.Math.h.sup.−1.Math.mm.sup.−3), and a strain rate is denoted by Y (min.sup.−1).

A method for producing a resin composition of the present invention is a method for producing a resin composition, the method including a step of obtaining a resin composition by heating and melt-kneading a mixture containing a particulate nucleating agent in which D.sub.50 is equal to or more than 0.1 μm and equal to or less than 300 μm and a thermoplastic resin using a twin screw extruder (100) including, inside a cylinder (10), a screw (50) having kneading discs (60), in which the step of obtaining a resin composition includes an extrusion step of extruding the mixture supplied into the twin screw extruder (100) in an ejection direction under kneading conditions in which X and Y satisfy 4.0≤X in a range of 6.0×10.sup.3≤Y≤7.0×10.sup.4 when a volume-based ejection amount is denoted by X (10.sup.−6.Math.kg.Math.h.sup.−1.Math.mm.sup.−3), and a strain rate is denoted by Y (min.sup.−1).

The present invention refers to a method for improving the storage stability and/or transport stability of polymer (A) comprising the following steps: a) providing polymer (A) selected from the group consisting of copolymers of ethylene and a C.sub.4C.sub.12 alpha olefin comonomer, copolymers of propylene and mixtures thereof containing additionally comonomer units comprising hydrolysable silane groups; b) providing a stabilizer (B) selected from the group consisting of sterically hindered phenols, alkyltri-alkoxysilanes, alkenyltrialkoxysilanes and mixtures thereof; c) mixing polymer (A) and stabilizer (B) to obtain a stabilized polymer composition (I); and d) transferring the stabilized polymer composition (I) obtained in step c) in a container comprising at least one barrier layer. In addition, the present invention relates to the use of stabilizer (B) for improving the storage stability and/or transport stability of polymer (A) stored and/or transported in a container having a barrier layer.

The present invention refers to a method for improving the storage stability and/or transport stability of polymer (A) comprising the following steps: a) providing polymer (A) selected from the group consisting of copolymers of ethylene and a C.sub.4C.sub.12 alpha olefin comonomer, copolymers of propylene and mixtures thereof containing additionally comonomer units comprising hydrolysable silane groups; b) providing a stabilizer (B) selected from the group consisting of sterically hindered phenols, alkyltri-alkoxysilanes, alkenyltrialkoxysilanes and mixtures thereof; c) mixing polymer (A) and stabilizer (B) to obtain a stabilized polymer composition (I); and d) transferring the stabilized polymer composition (I) obtained in step c) in a container comprising at least one barrier layer. In addition, the present invention relates to the use of stabilizer (B) for improving the storage stability and/or transport stability of polymer (A) stored and/or transported in a container having a barrier layer.

This invention provides a flame retardant agent composition capable of imparting excellent flame retardancy to a synthetic resin, a flame-retardant resin composition having excellent flame retardancy as well as water resistance and impact resistance, and a molded body thereof. Provided is a flame retardant agent composition containing the following components (A) and (B): component (A): a phosphate-based flame retardant agent containing at least any one of the following components (A-1) to (A-3): component (A-1): one or more melamine salts selected from the group consisting of melamine orthophosphate, melamine pyrophosphate, and melamine polyphosphate; component (A-2): one or more piperazine salts selected from the group consisting of piperazine orthophosphate, piperazine pyrophosphate, and piperazine polyphosphate; and component (A-3): one or more ammonium salts selected from the group consisting of ammonium orthophosphate, ammonium pyrophosphate, and ammonium polyphosphate; and component (B): one or more acid-modified polyolefins.

This invention provides a flame retardant agent composition capable of imparting excellent flame retardancy to a synthetic resin, a flame-retardant resin composition having excellent flame retardancy as well as water resistance and impact resistance, and a molded body thereof. Provided is a flame retardant agent composition containing the following components (A) and (B): component (A): a phosphate-based flame retardant agent containing at least any one of the following components (A-1) to (A-3): component (A-1): one or more melamine salts selected from the group consisting of melamine orthophosphate, melamine pyrophosphate, and melamine polyphosphate; component (A-2): one or more piperazine salts selected from the group consisting of piperazine orthophosphate, piperazine pyrophosphate, and piperazine polyphosphate; and component (A-3): one or more ammonium salts selected from the group consisting of ammonium orthophosphate, ammonium pyrophosphate, and ammonium polyphosphate; and component (B): one or more acid-modified polyolefins.

There is provided a molded article for water related application which can prevent molecular cleavage of polyamide caused by a radical generated from a chlorine-based oxidizing substance contained for sterilization in tap water, thereby preventing a degradation in the performance of the molded article. The molded article for water related application comprises a resin composition comprising; 100 parts by mass of a semi-aromatic polyamide (A); 10 to 200 parts by mass of an inorganic filler (B); and 0.1 to 2.0 parts by mass of a phenolic antioxidant (C), wherein the semi-aromatic polyamide (A) includes dicarboxylic acid units composed mainly of aromatic dicarboxylic acid units, and diamine units composed mainly of aliphatic diamine units, and wherein the phenolic antioxidant (C) has, in the molecule, a structure represented by the following formula (1);

##STR00001##

where ** represents a linking moiety.

There is provided a molded article for water related application which can prevent molecular cleavage of polyamide caused by a radical generated from a chlorine-based oxidizing substance contained for sterilization in tap water, thereby preventing a degradation in the performance of the molded article. The molded article for water related application comprises a resin composition comprising; 100 parts by mass of a semi-aromatic polyamide (A); 10 to 200 parts by mass of an inorganic filler (B); and 0.1 to 2.0 parts by mass of a phenolic antioxidant (C), wherein the semi-aromatic polyamide (A) includes dicarboxylic acid units composed mainly of aromatic dicarboxylic acid units, and diamine units composed mainly of aliphatic diamine units, and wherein the phenolic antioxidant (C) has, in the molecule, a structure represented by the following formula (1);

##STR00001##

where ** represents a linking moiety.

This invention relates to a polymer composition comprising: (A) at least one semi-crystalline polymer, and (B) a stabilizer composition comprising: (1) at least one primary antioxidant comprising at least one phenolic antioxidant; and (2) at least one secondary antioxidant comprising at least one phosphite, and (3) at least one chain extending agent; wherein the b* value for said polymer composition is less than 10 according to the L*, a* and b* color system of the CIE (International Commission on Illumination) after being heated for at least three hours at 200° C. or 24 hours at 175° C.

This invention relates to a polymer composition comprising: (A) at least one semi-crystalline polymer, and (B) a stabilizer composition comprising: (1) at least one primary antioxidant comprising at least one phenolic antioxidant; and (2) at least one secondary antioxidant comprising at least one phosphite, and (3) at least one chain extending agent; wherein the b* value for said polymer composition is less than 10 according to the L*, a* and b* color system of the CIE (International Commission on Illumination) after being heated for at least three hours at 200° C. or 24 hours at 175° C.