Processing additive, molding composition, masterbatch of processing additive and molding article

Abstract

Provided is a processing additive which can bring about improvements in moldability at Mooney viscosity levels at which the dispersibility in a melt-processable resin is high and which further can work at reduced addition levels. The processing additive contains a fluoropolymer having an acid value of not lower than 0.5 KOH mg/g.

1 . A masterbatch of processing additive comprising a processing additive and a melt-processable resin,
 wherein the processing additive comprises a fluoroelastomer and an interfacial agent,   wherein the content of the fluoroelastomer is more than 0.1% by mass and not higher than 20% by mass based on the sum of the mass of the fluoroelastomer and the mass of the melt-processable resin, and the content of the interfacial agent is 50% to 70% by weight based on the processing additive,   wherein the fluoroelastomer has an acid value of from 0.67 to 1.4 KOH mg/g,   wherein the fluoroelastomer is a vinylidene fluoride/hexafluoropropylene copolymer, or a vinylidene fluoride/tetrafluoroethylene/hexafluoropropylene copolymer,   wherein the melt-processable resin consists of a linear low-density polyethylene,   wherein a mole percentage of the vinylidene fluoride unit in the fluoroelastomer is 74 to 78 mole percent, and   wherein the interfacial agent is a polyethylene glycol.   
     
     
         2 . The masterbatch of processing additive according to  claim 1 , wherein the fluoroelastomer is a vinylidene fluoride/tetrafluoroethylene/hexafluoropropylene copolymer. 
     
     
         3 . The masterbatch of processing additive according to  claim 1 , wherein the fluoroelastomer is a vinylidene fluoride/hexafluoropropylene copolymer. 
     
     
         4 . A molding composition comprising a processing additive and a melt-processable resin,
 wherein the processing additive comprises a fluoroelastomer and an interfacial agent,   wherein the content of the fluoroelastomer is 0.0001 to 10% by mass based on the sum of the mass of the processing additive and the mass of the melt-processable resin, and the content of the interfacial agent is 50% to 70% by weight based on the processing additive,   wherein the fluoroelastomer has an acid value of from 0.67 to 1.4 KOH mg/g,   wherein the fluoroelastomer is a vinylidene fluoride/hexafluoropropylene copolymer, or a vinylidene fluoride/tetrafluoroethylene/hexafluoropropylene copolymer,   wherein the melt-processable resin consists of a linear low-density polyethylene,   wherein a mole percentage of the vinylidene fluoride unit in the fluoroelastomer is 74 to 78 mole percent, and   wherein the interfacial agent is a polyethylene glycol.   
     
     
         5 . The molding composition according to  claim 4 , wherein the fluoroelastomer is a vinylidene fluoride/tetrafluoroethylene/hexafluoropropylene copolymer. 25 
     
     
         6 . The molding composition according to  claim 4 , wherein the fluoroelastomer is a vinylidene fluoride/hexafluoropropylene copolymer. 
     
     
         7 . A molded article obtained by molding the molding composition according to  claim 4 . 
     
     
         8 . A masterbatch of processing additive comprising a processing additive and a melt-processable resin,
 wherein the processing additive comprises a fluoroelastomer and an interfacial agent,   wherein the content of the fluoroelastomer is more than 0.1% by mass and not higher than 20% by mass based on the sum of the mass of the fluoroelastomer and the mass of the melt-processable resin, and the content of the interfacial agent is 50% to 70% by weight based on the processing additive,   wherein the fluoroelastomer comprises acidic end groups derived from a polymerization initiator that provide an acid value of from 0.67 to 1.4 KOH mg/g,   wherein the fluoroelastomer is a vinylidene fluoride/hexafluoropropylene copolymer, or a vinylidene fluoride/tetrafluoroethylene/hexafluoropropylene copolymer,   wherein the melt-processable resin consists of a linear low-density polyethylene,   wherein a mole percentage of the vinylidene fluoride unit in the fluoroelastomer is 74 to 78 mole percent, and   wherein the interfacial agent is a polyethylene glycol.   
     
     
         9 . A molding composition comprising a processing additive and a melt-processable resin,
 wherein the processing additive comprises a fluoroelastomer and an interfacial agent,   wherein the content of the fluoroelastomer is 32 ppm to 5% by mass based on the sum of the mass of the processing additive and the mass of the melt-processable resin, and the content of the interfacial agent is 50% to 70% by weight based on the processing additive,   wherein the fluoroelastomer comprises acidic end groups that are derived from a polymerization initiator and provide an acid value of from 0.67 to 1.4 KOH mg/g,   wherein the fluoroelastomer is a vinylidene fluoride/hexafluoropropylene copolymer, or a vinylidene fluoride/tetrafluoroethylene/hexafluoropropylene copolymer,   wherein the melt-processable resin consists of a linear low-density polyethylene,   wherein a mole percentage of the vinylidene fluoride unit in the fluoroelastomer is 74 to 78 mole percent, and   wherein the interfacial agent is a polyethylene glycol.