Method of preparing improved imbibitive polymer

Details Method of preparing improved imbibitive polymer Method of preparing improved imbibitive polymer

1979-10-22

1981-05-26

Wong, Jr., Harry

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

428402, 526201, 526320, 5263232, 5263291, 5263297, C08F 2014

Patent

active

042699592

ABSTRACT:
An improved imbibitive polymer is prepared by a method which comprises linearly polymerizing methyl acrylate with a free radical-yielding catalyst while the acrylate is suspended in an aqueous medium containing selected suspending agent and while cross-linking the acrylate to a low level with selected cross-linking agent in a concentration of about 0.02-3%, by weight of the acrylate. The aqueous medium is heated and agitated during the reaction to keep the acrylate in fine suspension so that polymethyl acrylate beads are formed which do not agglomerate and which are capable of imbibing liquids having solubility parameters of about 8.5-11.5 Hildebrands. The catalyst concentration is usually about 1%, by weight of the methyl acrylate, and benzoyl peroxide and azo-bis-isobutyronitrile are preferred as the catalyst. The cross-linking agent is preferably divinyl benzene, 1,6-hexane-diol acrylate, ethylene glycol dimethacrylate and mixtures thereof, and is preferably used in a concentration of about 0.11-0.334%, by weight of the methyl acrylate. The suspending agent comprises a viscosity-increasing liquid such as acrylamide and/or sodium polyacrylate, with or without a solid suspending agent such as talc, bentonite, calcium carbonate, kaolin and mixtures thereof. Preferably an additional amount of catalyst is utilized near the end of the reaction to inhibit coalescence or agglomeration of the formed polymethyl acrylate beads.

REFERENCES:
patent: 2440808 (1948-04-01), Neher
patent: 3427262 (1969-02-01), Corte et al.
patent: 3548035 (1970-12-01), Ohe

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