Container with high density molecular weight polyethylene moisture barrier layer

A low moisture vapor transmission plastic container comprising:

• a sidewall including an inner surface, an outer surface and a thickness;
• a bottom wall located at a lower end of the sidewall, the bottom wall including an inner surface and an outer surface, wherein the inner surfaces of the sidewall and the bottom wall define an interior contents cavity;
• and
• a neck located at an upper end of the sidewall and including an engagement structure configured to engage a closure to seal the container;
• wherein at least a portion of the sidewall is formed from a moisture barrier, high density polyethylene resin having a resin density greater than 0.960 and less than 0.970 grams/cc and a polydispersity index between 8 and 10, wherein the sidewall has a thickness between 10 mil and 50 mils, wherein the moisture barrier, high density polyethylene resin has a water vapor transmission rate such that less than 0.050 grams of water per day traverse a layer of the moisture barrier, high density polyethylene resin having thickness of 1 mil and a surface area of 100 in2.

A method of forming low moisture vapor transmission plastic containers comprising:

• molding a first group of a plurality of container from a polyethylene resin having a resin density greater than 0.960 and less than 0.970 grams/cc and a polydispersity index between 8.5 and 9.0;
• testing the moisture vapor transmission rate of a wall of each container of the first group, wherein the container formed from the polyethylene resin has a water vapor transmission rate such that less than 0.050 grams of water per day traverse a layer of the polyethylene resin having thickness of 1 mil and a surface area of 100 in2;
• and
• molding a second group of a plurality of containers, each container of the second group having a layer formed from the polyethylene resin and having a sidewall defining an interior cavity and a neck defining an opening into the interior cavity.