Polycarboxylic acids with small amount of residual monomer
First Claim
1. A process conducted in the presence of less than about 1% of water for preparing a polymer from carboxylic monomer containing less than 0.2% of unreacted monomer having greater than 1% and less than 10% of the carboxyl groups of said monomer neutrialized comprising polymerizing a monomer charge containing at least 90% of an olefinically unsaturated carboxylic acid monomer of 3 to 5 carbon atoms, a partially neutralized salt thereof, and mixtures thereof, in the presence of a solvent in which said carboxylic acid monomer, or a salt thereof, is soluble but in which said polymer is insoluble, said solvent is selected from the group consisting essentially of acetone, alkyl acetates of 1 to 6 carbon atoms in the alkyl group, and mixtures thereof;
- in the presence of 0.2 to 2.0 weight percent of monomer charge of a crosslinker; and
in the presence of 0.4 to 1.0 weight percent of monomer charge of lauroyl peroxide initiator wherein reaction temperature is about 70°
to 80°
C. or in the presence of less than 2 weight percent of monomer charge of an initiator selected from the group consisting essentially of peroxydicarbonates wherein reaction temperature is about 45°
to 55°
C.
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Accused Products
Abstract
A polymer of an olefinically unsaturated carboxylic acid containing 3 to 5 carbon atoms is prepared which contains less than 0.2% by weight unreacted monomer in a solvent selected from acetone and lower alkyl acetates also in the presence with less than 5% of a crosslinker selected from polyalkenyl polyethers of polyhydric alcohols containing more than one alkenyl group per molecule wherein the polyhydric alcohol contains at least 4 carbon atoms and at least 3 hydroxyl groups and initiator selected from peroxides and peroxydicarbonates. Polymerization temperature is 40° to 85° C. and viscosity of the mixture after completing polymerization is less than 1000 cps. About 1 to 10% of the carboxyl groups on the polymer are neutralized.
54 Citations
7 Claims
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1. A process conducted in the presence of less than about 1% of water for preparing a polymer from carboxylic monomer containing less than 0.2% of unreacted monomer having greater than 1% and less than 10% of the carboxyl groups of said monomer neutrialized comprising polymerizing a monomer charge containing at least 90% of an olefinically unsaturated carboxylic acid monomer of 3 to 5 carbon atoms, a partially neutralized salt thereof, and mixtures thereof, in the presence of a solvent in which said carboxylic acid monomer, or a salt thereof, is soluble but in which said polymer is insoluble, said solvent is selected from the group consisting essentially of acetone, alkyl acetates of 1 to 6 carbon atoms in the alkyl group, and mixtures thereof;
- in the presence of 0.2 to 2.0 weight percent of monomer charge of a crosslinker; and
in the presence of 0.4 to 1.0 weight percent of monomer charge of lauroyl peroxide initiator wherein reaction temperature is about 70°
to 80°
C. or in the presence of less than 2 weight percent of monomer charge of an initiator selected from the group consisting essentially of peroxydicarbonates wherein reaction temperature is about 45°
to 55°
C. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- in the presence of 0.2 to 2.0 weight percent of monomer charge of a crosslinker; and
Specification