Abstract: A polyester container, such as a polyethylene terephthalate container produced by blowmolding can be given a modified exterior surface, such as a frosted appearance, by being blowmolded in a mold that has an irregular, pitted surface, the mold being at a temperature of at least about 40° C. above the glass transition temperature of the polyester resin. At this temperature of the mold the polyester resin will flow into the irregularities of the mold and produce a frosted appearance to the exterior surface of the container. One technique to give the mold an irregular, pitted surface is to grit-blast the interior of the mold that is to have the frosted appearance. Other modifications other than a frosted appearance can be imparted to the surface of a container. These include recesses, projections and serrations.

Abstract: Injection stretch blowmolded polyester tubes have been developed for use in packaging water-containing products. Polyester resins have good barrier properties for organic materials but poor moisture barrier properties. It has been found that the moisture barrier properties can be increased by coating the exterior surface of the tube with a first material which adheres to the tube polyester surface and to an overlayer of a moisture barrier comprising polyvinylidene chloride, However, since the overlayer of polyvinylidene chloride can develop a yellow tint, the overlayer in one embodiment is coated with an opaque decorative layer to prevent or mask the gradual yellowing of the polyvinylidene chloride overlayer. In another embodiment where the tube is to be substantially transparent, the product in the tube will have a color that will substantially cancel the yellow tint that is developed by the polyvinylidene chloride overlayer.