Stable latexes of carboxyl containing polymers
AssigneeThe B. F. Goodrich Company
InventorPravinchandra K. Shah
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Abstract
Viscosity stable polymers containing bound carboxyl groups in latex form when compounded at high solids content and at a high pH are obtained in accordance with this invention when the latex is prepared by polymerizing butadiene or an acrylic or methacrylic ester with an unsaturated carboxylic acid in the presence of an olefin sulfonate emulsifier. The olefin sulfonates contain a major proportion of C.sub.14 to C.sub.16 aliphatic carbon atoms. By use of this emulsifier, high total solids, viscosity stable latexes can be obtained by direct polymerization.
Claims12
A process for preparing viscosity stable latexes of polymers containing bound carboxyl groups comprising polymerizing butadiene-1,3 or an ester of acrylic or methacrylic acids with an olefinically unsaturated carboxylic acid in an aqueous emulsion with a free radical forming initiator in the presence of 0.05 to 5 weight parts of an olefin sulfonate emulsifier having the formula RCH.dbd.CH(CH.sub.2)xSO.sub.3 Y wherein x is 0 to 6 and Y is an alkali metal ion and R is C.sub.12 to C.sub.16.
Dependencies are inferred from the claim text.