Patent · US Expired

Use of the alpha-modification of cis-naphthoylenebis(benzimidazole) for pigmenting polyolefins

US4939193A · kind A · utility

0Cited by

3References

9Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Erwin Dietz · Kelkheim, DE
Siegfried Schiessler · Frankfurt am Main, DE

Key dates

Filing date	Oct 6, 1988
Grant date	Jul 3, 1990
Priority date	—
Expiry date	Oct 6, 2008

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08K5/3447
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The .alpha.-modification of cis-naphthoylenebis(benzimidazole) is unstable in many media and up to date has therefore only been used as a vat dye. However, according to the invention, the .alpha.-modification can readily be used for pigmenting in the mass polyolefins such as polyethylene, polypropylene or analogous copolymers. During pigmenting, the pigment which is prepared in a conventional manner, is stable in that modification and produces strong red dyeings.

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