METHOD FOR PREPARING A FLEXIBLE SUPERABSORBENT BINDER POLYMER COMPOSITION
First Claim
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1. A process for making a flexible superabsorbent binder polymer composition comprising the steps of:
- a) preparing a preneutralized monomer solution where the acidic monomer is at least partially neutralized;
b) adding a mixture of low molecular weight polyolefinic glycols having a molecular weight from about 200 to about 10,000, and an ethylenically unsaturated monomer containing a trialkoxysilane functional group to the preneutralized monomer solution;
c) preparing at least 2 initiator system solutions;
d) continuously adding the monomer solution of step b) during polymerization and the at least 2 initiator system solutions of step c) to water to form a mixture wherein the mixture reacts to form a polymer;
e) optionally adding the at least 2 initiator system solutions of step c) at an accelerated flow rate;
f) cooling the polymer; and
g) post-neutralizing the cooled polymer of step f) to increase the neutralization of the polymer to at least about 60 mol %.
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Abstract
A process of making the flexible superabsorbent binder polymer composition includes preparing a preneutralized monomer solution having at least about 40 mol % degree of neutralization, preparing a monomer solution including monoethylenically unsaturated monomers, one of which includes an alkyloxysilane functionality, preparing initiator system solutions and adding the solutions to the monomer solution, mixing the foregoing solutions into a polymerization solution, cooling the polymerization solution, and post neutralizing the polymer.
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Citations
26 Claims
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1. A process for making a flexible superabsorbent binder polymer composition comprising the steps of:
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a) preparing a preneutralized monomer solution where the acidic monomer is at least partially neutralized;
b) adding a mixture of low molecular weight polyolefinic glycols having a molecular weight from about 200 to about 10,000, and an ethylenically unsaturated monomer containing a trialkoxysilane functional group to the preneutralized monomer solution;
c) preparing at least 2 initiator system solutions;
d) continuously adding the monomer solution of step b) during polymerization and the at least 2 initiator system solutions of step c) to water to form a mixture wherein the mixture reacts to form a polymer;
e) optionally adding the at least 2 initiator system solutions of step c) at an accelerated flow rate;
f) cooling the polymer; and
g) post-neutralizing the cooled polymer of step f) to increase the neutralization of the polymer to at least about 60 mol %. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A process for making a flexible superabsorbent binder polymer composition comprising the steps of:
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a) preparing a monomer solution where the acidic monomer is at least partially neutralized;
b) adding a chain transfer agent to the monomer solution;
c) adding a mixture of low molecular weight polyolefinic glycols having a molecular weight from about 200 to about 10,000, and an ethylenically unsaturated monomer containing a trialkoxysilane functional group to the monomer solution;
d) preparing at least 2 initiator system solutions and adding the initiator system solutions to the monomer solution wherein the mixture reacts to form a polymer;
e) cooling the polymer of step d); and
f) post-neutralizing the cooled polymer of step e) to increase the neutralization of the polymer to at least about 60 mol %. wherein the mole ratio of oxidizing agent to the reducing agent is from about 6;
1 to about 2;
1. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A process for making a flexible superabsorbent binder polymer composition comprising the steps of:
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a) preparing a preneutralized monomer solution, having at least about 40 mol % degree of neutralization comprising a chain transfer agent, and a mixture of low molecular weight polyolefinic glycols having a molecular weight from about 200 to about 10,000, and an ethylenically unsaturated monomer containing a trialkoxysilane functional group;
b) preparing at least 2 initiator system solutions;
c) continuously adding the monomer solution of step a) during polymerization and the at least 2 initiator system solutions of step b) to water to form a mixture wherein the mixture reacts to form a polymer;
d) adding the at least 2 initiator system solutions of step b) at an accelerated flow rate;
e) cooling the polymer of step d); and
f) post-neutralizing the cooled polymer of step e) to increase the neutralization of the polymer to at least about 60 mol %. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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Specification