Method of incorporating hydrophobic monomers into acrylamide solutions
AssigneeExxon Chemical Patents Inc.
InventorsHenry W. Yang, Thomas J. Pacansky
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Abstract
Hydrophobic water-insoluble monomers, such as alkyl acrylamides, which are solid at room temperature may be sufficiently dissolved in concentrated acrylamide or methacrylamide monomer solutions, in the absence of cosolvents, to allow copolymerization to occur without substantial phase separation. The hydrophobic monomer is added to the acrylamide monomer solution and heated, with agitation, to above the melting point of the hydrophobic monomer. Thereafter the temperature must be maintained at no lower than about 15.degree. C. below the melting point.
Claims13
A method for incorporating a hydrophobic water-insoluble monomer into an acrylamide or methacrylamide monomer solution in the substantial absence of a cosolvent so that the monomers may be copolymerized without substantial phase separation which comprises:
- (i) adding a hydrophobic water-insoluble monomer which is solid at room temperature to an acrylamide or methacrylamide monomer solution and heating, while agitating, to above the melting point of the hydrophobic monomer for a sufficient period of time to effect dissolution;
- and
- (ii) maintaining the temperature of the resultant mixture at no lower than about 15.degree. C. below said melting point to copolymerize the hydrophobic monomer and the acrylamide or methacrylamide monomer.
A method for incorporating a hydrophobic water-insoluble monomer into an acrylamide or methacrylamide monomer solution in the substantial absence of a cosolvent so that the monomers may be copolymerized without substantial phase separation which comprises:
- (i) heating a mixture of a solid hydrophobic monomer and an acrylamide or methacrylamide monomer solution above the melting point of the hydrophobic monomer for a sufficient period of time to effect dissolution;
- and
- (ii) polymerizing said monomers while maintaining the temperature of the resultant solution at no lower than about 15.degree. C. below said melting point until polymerization is completed.
Dependencies are inferred from the claim text.