Patent · US Active

Extrusion expansion of low molecular weight polyalkylene terephthalate for production of expanded beads

US9174363B2 · kind B2 · utility

2Cited by

2References

10Claims

0Family size

Assignee

ARMACELL ENTERPRISE GMBH & CO. KG · DE

Inventors

Karl Paetz-Lauter · Nottuln, DE
Jie Li · Zofingen, CH
Mika Meller · Vevey, CH

Key dates

Filing date	Sep 6, 2012
Grant date	Nov 3, 2015
Priority date	—
Expiry date	Aug 26, 2033

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2998
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

An extrusion expansion of low molecular weight polyalkylene terephthalates having an IV of below 1.0 dl/g to produce gas-charged beads is disclosed. The process includes an extrusion expanding of the resins and an underwater pelletizing of the melt threads. The obtained beads show a composite structure and are characterized by an IV of 0.69 dl/g or more and a melt viscosity η0 of higher than 300 Pa·s.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.