Patent · US Expired

Cleaning material for extruders

US6673759B1 · kind B1 · utility

2Cited by

5References

10Claims

0Family size

Assignee

BASF SE

Inventors

Uwe Koch · Obertshausen, DE
Rainer Klenz · Herbrechtingen, DE
Peter Friel · Bischofswerda, DE
Brigitte Gareiss · Grünstadt, DE

Key dates

Filing date	Jun 14, 2001
Grant date	Jan 6, 2004
Priority date	—
Expiry date	Jun 14, 2021

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29K2077/00
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

The invention relates to a cleaning composition for apparatus for processing thermoplastic melts, which composition essentially comprises discrete particles capable of plastic deformation and made from a thermoplastic (A) with a melting point above 200° C. and with a crystallinity of not more than 50%, and comprises an amorphous or semicrystalline thermoplastic (B) with a processing temperature below the melting point of the thermoplastic (A). The proportion of the thermoplastic (A) is from 1 to 95% by weight and that of the thermoplastic (B) is from 5 to 95% by weight. The total of the percentage proportions by weight of (A) and (B) is always 100% or less.The discrete particles made from the thermoplastic (A) and capable of plastic deformation have a very effective cleaning action, while the amorphous or semicrystalline thermoplastic (B) acts as a liquid or flowable carrier for the particles, which are made from the thermoplastic (A) and/or contamination which has been released, and are capable of plastic deformation.

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