Patent ID: 9174363
Filing Date: 2015-11-03
Classification: B29B,B29C,C08J,Y10T

Abstract:
1. Expanded beads of a polyalkylene terephthalate resin, wherein the expanded beads comprise a cellular core encapsulated by a compact skin, wherein the cellular core comprises a fine-cell center and a microcellular layer, wherein the compact skin has a thickness between 30 μm and less than 120 μm; wherein the microcellular layer is adjacent to the compact skin and has a thickness not higher than 100 μm and a cell size below 15 μm; wherein the fine-cell center has a cell size below 400 μm, and wherein the expanded beads have an intrinsic viscosity of at least 0.69 dl/g according to ASTM D4603-03, a melt viscocity η