Patent ID: 6410109
Filing Date: 2002-06-25
Classification: C08L,C09K,Y10T

Abstract:
A closure,(1) which is a closure for a container, (2) wherein at least a sealing element of the closure is formed of a resin composition comprising as principal components (A) a polyolefin resin, (B) a vinyl alcohol copolymer and (C) an elastomer which is a block copolymer containing an aromatic vinyl polymer block (block (a)) and an isobutylene polymer block (block (b)); said component (B) being contained in an amount of 10 to 1000 parts by weight per 100 parts by weight of the component (A) and the component (C) being contained in an amount of 5 to 100 parts by weight per 100 parts by weight, in total, of the components (A) and (B); said resin composition being prepared by mixing said components (A), (B) and (C) under melting conditions; said resin composition satisfying the following conditions: [a]>[b] and [c]>[b], where the melt viscosities of the components (A), (B) and (C) are represented by [a], [b] and [c], respectively as measured at the same temperature under said melting conditions and at a shear rate of 100 secâˆ’1.