Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1998-12-02
2000-10-03
Warden, Jill
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
2524001, 25240023, 25240024, 252401, 425402, 264 6, C09K 1508, C09K 1514, C09K 1524, B32B 516, B29B 900
Patent
active
061268631
ABSTRACT:
The present invention is directed to a process for the production of agglomerates of a sterically hindered phenol antioxidant such that the agglomerates have a balanced hardness so as to resist abrasion during conveyance yet being readily dispersed in a host plastic. Such novel agglomerates are achieved through the use of a processing aid consisting of a solvent selected from the group consisting of methylene chloride, chloroform, toluene, acetone, methylethylketone, xylene, cyclohexane, styrene, methylcyclohexane and hexane having at least one gram of antioxidant dissolved therein per 100 mL of solvent and from about 20 to about 50 weight percent of an alcohol of the formula ROH wherein R is an alkyl group of 1 to 8 carbon atoms and thereafter using the resulting solution of solvent, alcohol, and antioxidant to form a paste of additional portions of the antioxidant which is thereafter agglomerated and dried.
The present invention further provides a novel process for controlling the hardness of an agglomerated sterically hindered phenol antioxidant or a mixture of such antioxidant and a secondary phosphite antioxidant through the use of a processing aid wherein there is employed from 20 to about 50 weight percent of an alcohol of the formula ROH and wherein the hardness of the resulting agglomerate is inverse to the amount of alcohol employed in the system.
REFERENCES:
patent: 4957956 (1990-09-01), Neri et al.
patent: 5240642 (1993-08-01), Neri et al.
patent: 5597857 (1997-01-01), Thibaut et al.
patent: 5846656 (1998-12-01), Dunski
Albemarle Corporation
Cole Monique T.
Pippenger Philip M.
Warden Jill
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