Patent · US Expired

Method of making fibrids from thermoplastics

US4642262A · kind A · utility

15Cited by

9References

9Claims

0Family size

Assignee

Dynamit Nobel GmbH · DE

Inventors

Bernhard Piotrowski · Lohmar, DE
Robert Buning · Troisdorf, DE
Bernhard Janser · Troisdorf, DE
Egon Lang · Röthis, AT

Key dates

Filing date	Mar 9, 1984
Grant date	Feb 10, 1987
Priority date	—
Expiry date	Mar 9, 2004

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T442/69
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

Disclosed is a method of making fibrids from thermoplastics synthetics and copolymers thereof by expanding by vaporization, in the presence of a gaseous propellant, a polymer solution under elevated pressure and elevated temperature in a mixing nozzle under shear inducing conditions wherein the true or apparent solution of the polymer in solvent is expanded by the use of superheated steam having an average energy density of at least 50 watt-seconds per cubic centimeter in the mixing nozzle.

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