Patent ID: 6465064
Filing Date: 2002-10-15
Classification: C08K,Y10T

Abstract:
A method of making a moulding composition for forming an article for packaging foodstuffs or toothpaste having increased barrier to gases and/or vapours, said method comprising the steps of:high shear mixing together a substantially non-polar thermoplastic resin with a lamellar filler comprising talc, the lamellar filler being delaminated when the composition is subjected to high shear to increase the aspect ratio of the filler as it breaks down into platelets, wherein the moulding composition after said high shear mixing has a CIE whiteness index of at least 45; and forming the moulding composition into an article for packaging foodstuffs or toothpaste, wherein the oxygen transmission rate of the article is decreased when compared to that of an article made without delaminated talc.