Patent ID: 7960007
Filing Date: 2011-06-14
Classification: B65D,Y10T

Abstract:
1. A retort liner for use in sealing a retortable container, comprising: at least two styrenic block copolymers, including a first styrenic block copolymer having a melt viscosity greater than or equal to 60,000 Pa·s at a shear rate of 4.6 1/s at 230° C. and a second styrenic block copolymer having a melt viscosity less than the first styrenic block copolymer, wherein the first and second styrenic block copolymers have at least one hard polymer block derived from at least two aromatic vinyl compound units, and at least one soft polymer block, wherein the soft polymer block includes at least one repeat unit derived from one or more of an olefin monomer and a diene monomer; a softener; one or more polyolefin (co)polymers; and wherein the retort liner has a hardness from Shore A 50 to Shore A 80 according to ASTM D-2240, and wherein the retort liner is a single layer in a form of a seal ring having an upper surface, lower surface and a diameter.