Patent · US Expired

Apparatus and method for direct injection of additives into a polymer melt stream

US6455612B2 · kind B2 · utility

0Cited by

22References

9Claims

0Family size

Assignee

BASF SE

Inventors

Charles F. Helms, Jr. · Florence, US
Dominick A. Burlone · Asheville, US
James L. Huff · Mars Hill, US
Thomas Kessler · Schifferstadt, DE
Herman F. Brandt · Birmingham, US
Walter Gotz · Obersülzen, DE
Jurgen Hofmann · Spalt, DE

Key dates

Filing date	Feb 27, 2001
Grant date	Sep 24, 2002
Priority date	—
Expiry date	Feb 27, 2021

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2982
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

This invention provides an apparatus and method for injecting an additive directly into a polymer melt stream. The method comprises supplying a melt flow of a polymeric host material to a die assembly having a thin-plate assembly and injecting at least one additive into at least one predetermined location in a cross-section of the melt flow of the polymeric host material while the melt flow passes through the die assembly. The method achieves uniform dosing of the one or more additives in the extrusion direction in the polymeric host material without homogeneously mixing the one or more additives and the polymeric host material. The apparatus for directly injecting one or more additives into a polymer melt stream comprises a pumping system, a die assembly having a thin-plate assembly, and a distribution line.

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