Patent · US Expired

Antistatic or electrically conductive thermoplastic polyurethanes: process for their preparation and their use

US4526952A · kind A · utility

22Cited by

3References

8Claims

0Family size

Assignee

BASF SE

Inventors

Gerhard Zeitler
Gerhard Bittner · Diepholz, DE
Knud Faehndrich · Diepholz, DE
Hans-Malte Rombrecht · Hamburg, DE

Key dates

Filing date	Jun 14, 1984
Grant date	Jul 2, 1985
Priority date	—
Expiry date	Jun 14, 2004

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S524/91
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

Antistatic and/or electrically conductive thermoplastic polyurethanes contain carbon black whose surface area determined by the BET method is from 600 to 1200 m.sup.2 /g, have a dibutylphthalate absorption number of 300 to 450 cm.sup.3 /100 g, a pour density of less than 250 kg/m.sup.3, and an average particle size less than 50 nm. Incorporation of the carbon black into the thermoplastic polyurethane produced by the continuous sheet method takes place at temperatures under the primary melt peak for the crystalline rigid segments, measured by means of differential calorimetry, preferably in an extruder. The products are suitable for preparing films for flat heating elements, antistatic hoses, cables, and profiles.

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