Patent · US Expired

Discharging granular linear polycondensates

US4258178A · kind A · utility

0Cited by

4References

4Claims

0Family size

Assignee

BASF SE

Inventors

Werner Hoerauf · Ludwigshafen, DE
Guenter Valentin · Ludwigshafen, DE

Key dates

Filing date	Dec 1, 1978
Grant date	Mar 24, 1981
Priority date	—
Expiry date	Dec 1, 1998

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2377/00
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A process for discharging a granular organic polymer, which is sensitive to molecular oxygen at elevated temperatures, from a treatment zone in which it has been continuously treated, at above 70.degree. C., with an inert gas which is free from molecular oxygen, and has subsequently been cooled, which process comprises withdrawing the polymer at .ltoreq.50.degree. C. through a narrow elongate tubular discharge zone, the said zone always being filled with granular polymer.

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