Durable pigments for plastic

Details Durable pigments for plastic Durable pigments for plastic

1996-04-16

1997-12-23

Bell, Mark L.

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106426, 106459, 106474, 427214, 428403, C09C 136

Patent

active

057003181

ABSTRACT:
Improved alumina-coated inorganic pigments having a first coating of boehmite alumina, a second coating of amorphous alumina, and a third coating of boehmite alumina which exhibit good durability, dispersibility, and optical properties in plastic compositions are disclosed. Also disclosed is a process whereby an aqueous slurry of an alumina-containing inorganic pigment is milled to achieve a particular particle size distribution, a first coating of boehmite alumina is precipitated onto the pigment material within a first pH range, a second amount of an alumina coating agent is added to the aqueous slurry within a second pH range to obtain a second coating of amorphous alumina over the first boehmite alumina coating, and then the pH of the slurry is adjusted to a third pH range thus forming a third boehmite alumina coating over the second amorphous alumina coating.

REFERENCES:
patent: 3770470 (1973-11-01), Swank
patent: 4022636 (1977-05-01), Murray
patent: 4075032 (1978-02-01), Thomas
patent: 4416699 (1983-11-01), Jacobson

Affiliated with

Also associated with

Rating

Durable pigments for plastic does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Durable pigments for plastic, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Durable pigments for plastic will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1799261