Polyester resin composition, method of producing the same, polyester film, and solar cell power generation module

Abstract

A polyester resin composition including: a polyester resin; a titanium compound derived from a catalyst; and a phosphorous compound, wherein formula (1): 0.10<Ti/P<0.20 is satisfied wherein Ti/P represents a mass content ratio of titanium element to phosphorus element in the polyester resin composition, and formula (2): 0.0090<ΔIV≦0.0185 (dL/g/hr) is satisfied wherein ΔIV represents an increase in an intrinsic viscosity of the polyester resin composition per hour under conditions of 225° C. and 50 Pa.

1 . A polyester resin composition comprising: a polyester resin; a titanium compound derived from a catalyst; and a phosphorous compound, wherein the following formula (1) and formula (2) are satisfied:
   0.10<Ti/P<0.20  (1)
   wherein Ti/P represents a mass content ratio of titanium element to phosphorus element in the polyester resin composition
   0.0090<ΔIV≦0.0185 (dL/g/hr)  (2)
 
   wherein ΔIV represents an increase in an intrinsic viscosity of the polyester resin composition per hour under conditions of 225° C. and 50 Pa.   
     
     
         2 . The polyester resin composition according to  claim 1 , wherein the titanium compound is an organic chelate titanium complex having an organic acid as a ligand. 
     
     
         3 . The polyester resin composition according to  claim 1 , wherein the phosphorus compound is a compound represented by the following formula (3):
   (RO) 3 P═O  (3)
   wherein R represents an alkyl group having from 1 to 3 carbon atoms.   
     
     
         4 . The polyester resin composition according to  claim 1 , wherein the following formula (4) and formula (5) are further satisfied:
   1 ppm<a mass content of titanium element in the polyester resin composition≦30 ppm  (4)
     50 ppm<a mass content of phosphorus element in the polyester resin composition≦90 ppm  (5).
   
     
     
         5 . The polyester resin composition according to  claim 1 , wherein the amount of terminal COOH groups contained in the polyester resin composition is 25 eq/t or less. 
     
     
         6 . The polyester resin composition according to  claim 1 , wherein a common logarithm of R (Log R) is 6.9 or less, wherein R represents a volume resistivity (Ω·m) of the polyester resin composition. 
     
     
         7 . The polyester resin composition according to  claim 1 , further comprising 50 ppm by mass or more of at least one metal selected from the group consisting of an alkali metal, an alkaline earth metal, an iron-group metal, manganese, tin, lead, and zinc. 
     
     
         8 . A method of producing a polyester resin composition, comprising:
 (A) reacting a dicarboxylic acid component and a diol component through an esterification reaction to obtain an esterification reaction product;   (B) performing a transesterification reaction of the esterification reaction product to obtain a condensation polymerization product; and   adding a phosphorus compound to a reaction liquid, before the esterification reaction in step (A) is terminated but after a titanium compound is added to the reaction liquid, so as to satisfy the following formula (1) and formula (2):
   0.10<Ti/P<0.20  (1)
 
   wherein Ti/P represents a mass content ratio of titanium element to phosphorus element in the polyester resin composition
   0.0090<ΔIV≦0.0185 (dL/g/hr)  (2)
 
   wherein ΔIV represents an increase in an intrinsic viscosity of the polyester resin composition per hour under conditions of 225° C. and 50 Pa.   
     
     
         9 . The method of producing a polyester resin composition according to  claim 8 , further comprising adding a compound containing at least one metal selected from the group consisting of an alkali metal, an alkaline earth metal, an iron-group metal, manganese, tin, lead, and zinc to the reaction liquid before the addition of the phosphorus compound. 
     
     
         10 . The method of producing a polyester resin composition according to  claim 8 , wherein the addition of the phosphorus compound is performed by adding an addition solution, which is prepared by dissolving the phosphorus compound in a solution containing the diol component at about 25° C., to the reaction liquid before step (A) is terminated. 
     
     
         11 . The method of producing a polyester resin composition according to  claim 10 , wherein the content of the phosphorus compound in the addition solution is from 1% by mass to 10% by mass with respect to a total mass of the addition solution. 
     
     
         12 . The method of producing a polyester resin composition according to  claim 8 , wherein a polymerization temperature is 280° C. or lower. 
     
     
         13 . The method of producing a polyester resin composition according to  claim 8 , further comprising (C) performing solid-state polymerization of the condensation polymerization product obtained in step (B). 
     
     
         14 . The method of producing a polyester resin composition according to  claim 13 , wherein the solid-state polymerization is performed under a pressure of from 1 Pa to 1000 Pa. 
     
     
         15 . The method of producing a polyester resin composition according to  claim 13 , wherein the solid-state polymerization is performed in a nitrogen atmosphere. 
     
     
         16 . A polyester resin composition obtained by the method according to  claim 8 . 
     
     
         17 . A polyester film comprising the polyester resin composition according to  claim 1  and having a thickness of from 250 μm to 500 μm. 
     
     
         18 . The polyester film according to  claim 17 , which is a polyester film for a solar cell. 
     
     
         19 . The polyester film according to  claim 17 , wherein a storage time until elongation at break of the polyester film after storage in an atmosphere of 85° C. and 85% RH becomes 50% of elongation at break of the polyester film before the storage is 4000 hours or longer. 
     
     
         20 . A solar cell power generation module comprising the polyester film according to  claim 17 .