Patent · US Expired

Brightener mixtures and their use

US4129412A · kind A · utility

6Cited by

2References

3Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Dieter Gunther · Kelkheim, DE
Erich Schinzel
Rudiger Erckel · Eppstein, DE
Gunter Rosch · Bad Soden am Taunus, DE

Key dates

Filing date	Jun 28, 1977
Grant date	Dec 12, 1978
Priority date	—
Expiry date	Jun 28, 1997

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S8/933
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Mixtures of optical brighteners containing 0.05 to 1% of a 4-benzoxazolystilbene derivative and 1 to 0.05% of a 1,4-bis-benzoxazolyl- or bis-benzthiazolyl-naphthalene derivative. These mixtures show a higher degree of whiteness than an equal amount of only one of the two components.

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