Compositions: coating or plastic – Materials or ingredients – Miscellaneous
Patent
1976-08-06
1979-05-15
Derrington, James H.
Compositions: coating or plastic
Materials or ingredients
Miscellaneous
106308B, 106308Q, 106308F, 106308N, 106308S, 106309, 260 4214, 260 4215, 260 4216, 260 4221, 260 4253, C08K 902, C08K 904, C08K 910
Patent
active
041546210
ABSTRACT:
An intrachromoleucospheruloid pigment composition and a process for producing the same; the intrachromoleucospheruloid pigment composition consisting essentially of spheruloids of essentially transparent organic polymer material, preferably cross-linked to essential insolubility in any physical solvent, having primary particles of an average size not exceeding 4 microns in diameter which have embedded therein particulate pigment composition consisting essentially of (a) organic color pigment material having primary particles of an average particle size not exceeding 0.2 micron and preferably below 0.02 micron in diameter in combination with (b) inorganic leuco pigment material consisting essentially of inorganic white and/or transparent white pigment material having a different refractive index from that of element (a) and primary particles not exceeding 0.2 micron and preferably between 0.2 and 0.1 micron in diameter. In the process for its production (a) the organic color pigment material is reduced to an average particle size of 0.2 micron or less, (b) the inorganic leuco pigment material is reduced to an average particle size of 0.2 micron or less, (c) the combined organic and inorganic leuco pigment materials (a) and (b) are then included in an emulsion polymerization of monomer material preferably comprising an effective quantity of cross-linking agent, and the polymerization is conducted to produce emulsion polymer of an average particle size not exceeding 4 microns in diameter, having embedded therein the still smaller organic color and inorganic leuco pigment particles. Cooperative features are also disclosed.
REFERENCES:
patent: 2751369 (1956-06-01), Te Grotenhuis
patent: 2786822 (1957-03-01), Vesce
patent: 3133893 (1964-05-01), Newman
patent: 3423358 (1969-01-01), Burke
patent: 3502582 (1970-03-01), Clemens
patent: 3700690 (1972-10-01), Burke
Burke, Jr., deceased Oliver W.
Humphreys Victor T.
Darrah Marion
Derrington James H.
Houghton Joseph Y.
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