Polymerizate composition and a method for producing the same
First Claim
1. A water-soluble cationic copolymer or terpolymer composition obtained by continuous polymerization of acrylamide and at least one unsaturated cationic monomer selected from the group consisting of quaternized dialkylaminoalkyl(meth)acrylates and quaternized dialkylaminoalkyl(meth)acrylamides,wherein said polymerization is effected on a moving support with a predetermined residence time, andwherein during said polymerization the metering rate of the acrylamide or the at least one unsaturated cationic monomer is varied in the feed to the moving support in a continuous fashion according to an oscillation about a mean value, wherein oscillation is effected by steadily increasing and steadily decreasing back the metering rate over a time period of about 45 to about 60 minutes.
13 Assignments
0 Petitions
Accused Products
Abstract
The invention relates to water-soluble, preferably powder-form polymer compositions which are obtained by continuous polymerization of at least one unsaturated monomer. At least one parameter that influences the polymerization is varied according to a recurrent pattern. The invention also relates to the use of the inventive polymer compositions and to a method for producing them.
-
Citations
16 Claims
-
1. A water-soluble cationic copolymer or terpolymer composition obtained by continuous polymerization of acrylamide and at least one unsaturated cationic monomer selected from the group consisting of quaternized dialkylaminoalkyl(meth)acrylates and quaternized dialkylaminoalkyl(meth)acrylamides,
wherein said polymerization is effected on a moving support with a predetermined residence time, and wherein during said polymerization the metering rate of the acrylamide or the at least one unsaturated cationic monomer is varied in the feed to the moving support in a continuous fashion according to an oscillation about a mean value, wherein oscillation is effected by steadily increasing and steadily decreasing back the metering rate over a time period of about 45 to about 60 minutes.
-
11. A process for the preparation of a water-soluble cationic copolymer or terpolymer composition, comprising continuously polymerizing acrylamide and at least one unsaturated cationic monomer selected from the group consisting of quaternized dialkylaminoalkyl(meth)acrylates and quaternized dialkylaminoalkyl(meth)acrylamides,
wherein said polymerization is effected on a moving support with a predetermined residence time, and wherein during said polymerization the metering rate of the acrylamide or the at least one unsaturated cationic monomer is varied in the feed to the moving support in a continuous fashion according to an oscillation about a mean value, wherein the oscillation is effected by steadily increasing and steadily decreasing back the metering rate over a time period of about 45 to about 60 minutes.
Specification