Zipper tape, and container with zipper tape

Abstract

A zipper tape includes: a first resin portion made of a resin composition whose main polymer is polyolefin, the first resin portion including a base strip to define a pair of base strips and an engaging portion to define a pair of mutually engageable engaging portions, the engaging portion projecting from corresponding one of mutually facing faces of the base strips; and second resin portions made of a resin composition whose main polymer is polyester, the second resin portions at least covering faces of the base strips opposite the engaging portions.

1 . A zipper tape comprising:
 a first resin portion made of a resin composition whose main polymer is polyolefin, the first resin portion comprising a pair of base strips and a pair of engaging portions being engageable with each other and respectively projecting from surfaces of the pair of base strips facing with each other; and   a second resin portion made of a resin composition whose main polymer is polyester, the second resin portion at least covering surfaces of the pair of base strips opposite from the engaging portions.   
     
     
         2 . The zipper tape according to  claim 1 , further comprising a bonding resin layer provided between the first resin portion and the second resin portion. 
     
     
         3 . The zipper tape according to  claim 1  or  2 , wherein the second resin portion at least partially covers an end surface of at least one of the base strips in a width direction of the zipper tape. 
     
     
         4 . The zipper tape according to  claim 3 , wherein the second resin portion further covers a portion of the surfaces of the base strips provided with the engaging portions, the portion being continuous with the end surface of the at least one of the base strips in the width direction of the zipper tape. 
     
     
         5 . The zipper tape according to any one of  claims 1  to  4 , wherein the second resin portion forms a slab portion extending outwardly in the width direction of the zipper tape with respect to the end surface of the at least one of the base strips. 
     
     
         6 . The zipper tape according to any one of  claims 1  to  5 , wherein the first resin portion comprises a plurality of resin portions arranged in parallel with each other in the width direction of the zipper tape, and
 the second resin portion forms the slab portion between the plurality of resin portions. 
 
     
     
         7 . The zipper tape according to any one of  claims 1  to  6 , wherein the engaging portions comprise a male member and a female member contacting in surface with each other to form a hermetic sealing engagement. 
     
     
         8 . A container with a zipper tape comprising:
 a zipper tape according to any one of  claims 1  to  7 ; and   a container body welded with the zipper tape.   
     
     
         9 . The container with the zipper tape according to  claim 8 , wherein a layer of the container body facing with the zipper tape is made of a resin composition whose main polymer is heat-sealable PET. 
     
     
         10 . The container with the zipper tape according to  claim 8  or  9 , wherein the container body forms a bag body.