Patent ID: 6544609
Filing Date: 2003-04-08
Classification: B29C,B65D,C08K,Y10T

Abstract:
A closure for a container comprising a top and an annular skirt, said closure is formed of a stiff and impact resistant polymeric blend, the blend comprising from about 60 to about 75 weight percent of a polymer selected from the group consisting of poly(propylene) and a random copolymer of ethylene and propylene; and from about 25 to about 35 weight percent of calcium carbonate particles treated with fatty acid, wherein said calcium carbonate particles have a particle size of from about 2.5 to about 3.5 microns,wherein said closure has a falling weight impact resistance at âˆ’20Â° C. of from about 0.4 to about 2.5 joules and a Youngs' modulus at room temperature of from about 1800 to about 2200 megapascals.