HIGH I.V. POLYESTER COMPOSITIONS CONTAINING PLATELET PARTICLES

摘要

The present invention relates to polyester-platelet particle composite compositions comprising about 0.01 to about 25 weight percent platelet particles dispersed in at least one polyester wherein said composition has an I.V. of greater than about 0.55 dl/g, low shear melt viscosity greater than about 30,000 poise and a gas permeability which is at least 10 % lower than that of unmodified polyester. The platelet particles are preferably derived from chemically modified or synthetic clays and have a thickness of less than 2 nm and a diameter between 10 to 2000 nm. The high viscosity filled polyester composition is prepared by polycondensing a polyester-platelet particle precomposition in the solid state.