Resin composition, molded body, and their application

Abstract

Provided are a resin composition having excellent oxygen barrier property under high humidity as a novel resin material, a molded body, a method for producing a molded body, and a method for producing a pellet using the resin composition. The resin composition includes a resin component and a plate-shaped talc having an aspect ratio of more than 18, 80 mass % of the resin component comprising a barrier resin having an oxygen transmission coefficient of 5.0 cc·mm/(m 2 ·day·atm) or less as measured according to ASTM D3985 at a relative humidity of 60% and a temperature of 23° C., and a content of the plate-shaped talc being from 3.0 to 55.0 mass % when a total of the barrier resin and the plate-shaped talc is 100 mass %.

1 . A resin composition comprising a resin component and a plate-shaped talc having an aspect ratio of more than 18,
 the resin component comprising a barrier resin having an oxygen transmission coefficient of 5.0 cc·mm/(m 2 ·day·atm) or less as measured according to ASTM D3985 at a relative humidity of 60% and a temperature of 23° C., and   a content of the plate-shaped talc being from 3.0 to 55.0 mass % when a total of the barrier resin and the plate-shaped talc is 100 mass %.   
     
     
         2 . The resin composition according to  claim 1 , wherein the content of the plate-shaped talc is more than 15.0 mass % and 35.0 mass % or less of the total of the barrier resin and the plate-shaped talc. 
     
     
         3 . The resin composition according to  claim 1 , wherein the barrier resin comprises a polyamide resin. 
     
     
         4 . The resin composition according to  claim 1 , wherein the barrier resin comprises a semi-aromatic polyamide resin. 
     
     
         5 . The resin composition according to  claim 1 , wherein the barrier resin comprises a diamine-derived structural unit and a dicarboxylic acid-derived structural unit, and 50 mol % or more of the diamine-derived structural units comprise a xylylenediamine-based polyamide resin derived from xylylenediamine. 
     
     
         6 . The resin composition according to  claim 5 , wherein in the xylylenediamine-based polyamide resin, 70 mol % or more of the diamine-derived structural units are derived from xylylenediamine, and the dicarboxylic acid-derived structural unit comprises a structural unit derived from an α,ω-linear aliphatic dicarboxylic acid having from 4 to 20 carbon atoms. 
     
     
         7 . The resin composition according to  claim 5 , wherein in the xylylenediamine-based polyamide resin, 70 mol % or more of the diamine-derived structural units are derived from xylylenediamine, and the dicarboxylic acid-derived structural unit comprises an isophthalic acid-derived structural unit. 
     
     
         8 . The resin composition according to  claim 1 , wherein OTC 90 /OTC 60 , which is the ratio of oxygen transmission coefficient OTC 90  of the resin composition measured according to ASTM D3985 at a relative humidity of 90% and a temperature of 23° C. to the oxygen transmission coefficient OTC 60  of the resin composition measured according to ASTM D3985 at a relative humidity of 60% and a temperature of 23° C., is 1.5 or less. 
     
     
         9 . The resin composition according to  claim 1 , wherein OTC 90′ /OTC 90 , which is the ratio of oxygen transmission coefficient OTC 90′  of a composition obtained by removing the plate-shaped talc from the resin composition measured according to ASTM D3985 at a relative humidity of 90% and a temperature of 23° C. to the oxygen transmission coefficient OTC 90  of the resin composition measured according to ASTM D3985 at a relative humidity of 90% and a temperature of 23° C., is 1.5 or more. 
     
     
         10 . A molded body comprising a resin component and plate-shaped talc having a maximum length to minimum width ratio R max  of more than 9 as measured according to the following conditions, the resin component containing a barrier resin having an oxygen transmission coefficient of 5.0 cc·mm/(m 2 ·day·atm) or less as measured according to ASTM D3985 at a relative humidity of 60% and a temperature of 23° C., and the content of the plate-shaped talc being from 3.0 to 55.0 mass % when the total of the barrier resin and the plate-shaped talc is 100 mass %;
 where, the maximum length to minimum width ratio R max  of the plate-shaped talc refers to the largest value among R 0 , R 45 , and R 90 ; R 0  refers to an average value of the top 1% of the maximum length to minimum width ratios of the plate-shaped talcs contained in a region having an area of 1200 μm 2  of an arbitrary cross section in the molded body; R 45  is an average value of the top 1% of the maximum length to minimum width ratios of the plate-shaped talcs contained in a region of 1200 μm 2  of a cross section in a 45° direction with respect to the arbitrary cross section in the molded body; and R 90  refers to an average value of the top 1% of the maximum length to minimum width ratios of the plate-shaped talcs contained in a region of 1200 μm 2  of a cross section in a 90° direction with respect to the arbitrary cross section in the molded body. 
 
     
     
         11 . The molded body according to  claim 10 , wherein the barrier resin comprises a polyamide resin. 
     
     
         12 . The molded body according to  claim 10 , wherein the barrier resin comprises a semi-aromatic polyamide resin. 
     
     
         13 . The molded body according to  claim 10 , wherein the barrier resin comprises a diamine-derived structural unit and a dicarboxylic acid-derived structural unit, and 50 mol % or more of the diamine-derived structural units comprise a xylylenediamine-based polyamide resin derived from xylylenediamine. 
     
     
         14 . The molded body according to  claim 13 , wherein in the xylylenediamine-based polyamide resin, 70 mol % or more of the diamine-derived structural units are derived from xylylenediamine, and the dicarboxylic acid-derived structural unit comprises a structural unit derived from an am-linear aliphatic dicarboxylic acid having from 4 to 20 carbon atoms. 
     
     
         15 . The molded body according to  claim 13 , wherein in the xylylenediamine-based polyamide resin, 70 mol % or more of the diamine-derived structural units are derived from xylylenediamine, and the dicarboxylic acid-derived structural unit comprises an isophthalic acid-derived structural unit. 
     
     
         16 . The molded body according to  claim 10 , wherein the molded body is formed from a resin composition,
 wherein the resin composition comprises a resin component and a plate-shaped talc having an aspect ratio of more than 18,   the resin component comprises a barrier resin having an oxygen transmission coefficient of 5.0 cc·mm/(m 2 ·day·atm) or less as measured according to ASTM D3985 at a relative humidity of 60% and a temperature of 23° C., and   a content of the plate-shaped talc is from 3.0 to 55.0 mass % when a total of the barrier resin and the plate-shaped talc is 100 mass %.   
     
     
         17 . The molded body according to  claim 10 , which is a film. 
     
     
         18 . A container comprising a molded body described in  claim 10 . 
     
     
         19 . A multilayer body comprising a polyolefin layer and a barrier resin layer, the barrier resin layer being formed from a resin composition described in  claim 1 . 
     
     
         20 . A multilayer body comprising a polyolefin layer, paper, and a barrier resin layer, the barrier resin layer being formed from a resin composition described in  claim 1 . 
     
     
         21 . A multilayer body comprising a resin foam and a barrier resin layer on at least a part of the outside of the resin foam, the barrier resin layer being formed from a resin composition described in  claim 1 . 
     
     
         22 . A method for producing a molded body, comprising molding a resin composition described in  claim 1 . 
     
     
         23 . The method for producing a molded body according to  claim 22 , wherein the molded body is a molded body comprising a resin component and plate-shaped talc having a maximum length to minimum width ratio R max  of more than 9 as measured according to the following conditions, the resin component containing a barrier resin having an oxygen transmission coefficient of 5.0 cc·mm/(m 2 ·day·atm) or less as measured according to ASTM D3985 at a relative humidity of 60% and a temperature of 23° C., and the content of the plate-shaped talc being from 3.0 to 55.0 mass % when the total of the barrier resin and the plate-shaped talc is 100 mass %;
 where, the maximum length to minimum width ratio R max  of the plate-shaped talc refers to the largest value among R 0 , R 45 , and R 90 ; R 0  refers to an average value of the top 1% of the maximum length to minimum width ratios of the plate-shaped talcs contained in a region having an area of 1200 μm 2  of an arbitrary cross section in the molded body; R 45  is an average value of the top 1% of the maximum length to minimum width ratios of the plate-shaped talcs contained in a region of 1200 μm 2  of a cross section in a 45° direction with respect to the arbitrary cross section in the molded body; and R 90  refers to an average value of the top 1% of the maximum length to minimum width ratios of the plate-shaped talcs contained in a region of 1200 μm 2  of a cross section in a 90° direction with respect to the arbitrary cross section in the molded body. 
 
     
     
         24 . The method for producing a molded body according to  claim 22 , wherein the molding is thermoforming molding. 
     
     
         25 . A method for producing a pellet, comprising melting and kneading at least one resin component and a plate-shaped talc with an aspect ratio of more than 18, the resin component comprising a barrier resin having an oxygen transmission coefficient of 5.0 cc·mm/(m 2 ·day·atm) or less as measured according to ASTM D3985 at a relative humidity of 60% and a temperature of 23° C., and a content of the plate-shaped talc being from 3.0 to 55.0 mass % when a total of the barrier resin and the plate-shaped talc is 100 mass %. 
     
     
         26 . A pellet formed from a resin composition described in  claim 1 .