Plastic preform

An oriented multilayered polymeric preform for making an open mouth container comprising a base defined by an inner circular portion having a predetermined radius and an outer circular portion having a greater radius and situated parallel to said inner circular portion and spaced therefrom, said outer portion having a ratio of the radius of the outer circular portion to the radius of the inner circular portion of less than 1 to 0.50, an outwardly extending annular member integral with said base and tapering therefrom, said member having its greater thickness adjacent the circumference of said inner and outer circular portions, said annular member forming an angle of inclination with said outer circular portion of between about 2.degree. to about 30.degree., and a flange integral with the annular member and extending radially outwardly and having a cross-section configuration of substantially the rim of the finished container.

An oriented multilayered polymeric preform comprising an inner and outer circular base section, the radius of said outer section being larger than the inner base section, an annular member connected integrally to said inner and outer circular base sections and having a thickness adjacent the circumference of said inner and outer circular portions which is substantially greater than any other portion of the preform so as to offer a reservoir of polymeric material, said annular members forming an angle with the outer circular base of between about 2.degree. and 30.degree., and a flange integral with the annular member and extending outwardly, said preform including an oxygen barrier layer of polyvinylidene chloride disposed between outer layers of polyolefin.