Patent ID: 7781530
Filing Date: 2010-08-24
Classification: C08L,Y10T

Abstract:
1. An injection molded pharmaceutical stopper comprising a composition consisting essentially of: (i) a first component comprising isobutylene-based polymer; (ii) about 5 parts to about 40 parts by weight, based on 100 parts by weight of the isobutylene-based polymer, of a second polymer component comprising propylene-derived units and optionally polyene-derived units, the second polymer component having a heat of fusion of from 7 J/g to 75 J/g and wherein the propylene-derived units have an isotactic triad fraction of 75% to 97%; (iii) about 2 parts to about 10 parts by weight of a non-functionalized plasticizer, based on 100 parts by weight of the isobutylene-based polymer, the non-functionalized plasticizer having a kinematic viscosity of 2 cSt or more at 100° C., and a flash point of at least 190° C.; (iv) from 1 to 60 wt %, by weight of the article, of a filler; and (v) curative agents and accelerators;