Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1973-06-21
1976-11-16
Turer, Richard B.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
260 4229, 260 4252, 260836, 260876R, 260886, C08L 3102, C08L 5100
Patent
active
039924866
ABSTRACT:
A process for preparing crosslinked spherical particulate addition polymeric (<30 microns in diameter) of ethylenically unsaturated monomers and polyunsaturated crosslinking monomers, such as a polymer of styrene crosslinked with divinylbenzene, is provided. Preferably, subsequent to polymerization of the polymer particles, additional crosslinking is provided by reaction of functional groups in the addition-polymerized monomers other than carbon-to-carbon unsaturation, such as the reaction of an epoxy group with a carboxyl group. The minute particles are utilized as "pigments" in cast, molded, or extruded normally transparent plastics such as polymethyl methacrylate, or in coatings and films, to make such articles translucent, or opaque if in large proportions.
The refractive index of the particulate polymer is of course different than that of the continuous plastic matrix of the final article, and is preferably above that of the matrix.
The particles are formed by endopolymerization wherein a small amount of a polymer is dissolved in a large volume of monomers which are then polymerized, and phase separation occurs; i.e., the newly former polymer is insoluble in the dissolved polymer, and the newly formed polymer appears as small particles dispersed in a continuous phase or matrix of the preexisting polymer.
REFERENCES:
patent: 3309424 (1967-03-01), Abe et al.
patent: 3345434 (1967-10-01), Griffith
patent: 3405087 (1968-10-01), Fryd
Fein Michael B.
Rohm and Haas Company
Turer Richard B.
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