Low density composite opacifiers

Details Low density composite opacifiers Low density composite opacifiers

1989-06-06

1989-12-19

Foelak, Morton

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

428222, 521 54, 521 56, 521 57, 521 58, C08J 922, C08J 932

Patent

active

048882410

ABSTRACT:
Enhanced hiding power for opacifiers in paints, inks, and other coatings is provided by employing the opacifiers, such as TiO.sub.2, ZnO, talc, CaCo.sub.3, and the like, adhered to or embedded in the surface of thermoplastic micorspheres. The composite opacifier-microsphere material is readily formed with a preselected specific gravity, so that there is little tendency for the material to separate. In addition, the composite behaves in the coating as a opacifier-air interface, having a very high difference in refractive indices, and exceptional hiding power. The high volume to weight ratio of the composite affords very attractive economic advantages, effectively reducing the weight proportion of opacifiers required in the formulations, and other related advantages.

REFERENCES:
patent: 4397799 (1983-08-01), Edgren et al.
patent: 4513106 (1985-04-01), Edgren et al.
patent: 4722943 (1988-02-01), Melber et al.

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