Patent · US Expired

Powdery pearlescent pigment composition

US4116628A · kind A · utility

15Cited by

8References

5Claims

0Family size

Assignee

E. Merck · DE

Inventors

Reiner Hesse · Darmstadt, DE
Hans Pratzer · Darmstadt, DE
Manfred Kieser · Darmstadt, DE
Gerhard Edler · Trebur, DE

Key dates

Filing date	Jan 27, 1977
Grant date	Sep 26, 1978
Priority date	—
Expiry date	Jan 27, 1997

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09C2200/405
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

Powdery pearlescent pigment compositions comprising individual particles of a flaky nacreous pigment coated with 1 to 50 weight percent of a solid polymer, optionally containing wetting agents, fillers, additional coloring agents, UV-absorbers or scenting agents, are produced by combining a suspension of a flaky nacreous pigment with a solution of a polymer, possibly containing other substances, and subsequently depositing polymer on the pigment flakes. The compositions can be used as pigments in cosmetics and can be stored and shipped as dry powders without loss of properties.

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