Preform for multilayer container comprising a polyethylene furanoate layer

Abstract

A preform for multilayer container having a polyethylene furanoate layer includes an outer layer defining an exterior surface and including poly(ethylene terephthalate) and an inner barrier layer including semi-crystalline poly(ethylene furanoate) where the semi-crystalline poly(ethylene furanoate) of the inner barrier layer has a crystallinity in the range of 3 to 10%.

The invention claimed is: 
     
         1 . A preform comprising an outer layer defining an exterior surface and comprising poly(ethylene terephthalate) and an inner barrier layer comprising semi-crystalline poly(ethylene furanoate) wherein semi-crystalline poly(ethylene furanoate) of the inner barrier layer has a crystallinity in the range of 3 to 10%. 
     
     
         2 . The preform according to  claim 1 , comprising an additional inner layer defining an interior surface and comprising poly(ethylene terephthalate), wherein the inner barrier layer is arranged between the outer layer and the additional inner layer. 
     
     
         3 . The preform according to  claim 1 , wherein the poly(ethylene furanoate) has a content of diethylene glycol of at most 2 wt %, based on the poly(ethylene furanoate). 
     
     
         4 . A method of making a container comprising:
 providing a preform according to  claim 1 , and   stretch blow-molding the preform to a container.   
     
     
         5 . The method according to  claim 4 , wherein the stretch blow-molding comprises a relaxation step. 
     
     
         6 . The method according to  claim 5 , wherein the relaxation step is performed with a mold temperature of at least 15° C., preferably at least 30° C. and/or a hold time of at least 1 s, preferably at least 2 s, in the mold. 
     
     
         7 . The method according to  claim 5 , wherein the relaxation step is performed in a mold of a material with a thermal conductivity below 5 W/(m*K), preferably of a non-metal material. 
     
     
         8 . The method according to  claim 4 , wherein providing the preform comprises a polymerization process of resin, wherein 10 to 10,000 ppm (mole/mole) of at least one of terephthalic acid, isophthalic acid, naphthalene dicarboxylic acid, or other aromatic diacids and/or at least one crystal nucleating agent is added.