US 2012/0071608 A1 · Copolymer Blend Compositions for Use to Increase Paper Filler Content

Abstract

Methods for making a heterogeneous polymer blend comprising one or more anionic polymers, one or more cationic polymers, and one or more non-ionic polymers, which method comprises (a) adding to a non-neutral solution a first amount of polymerization initiator and one or more anionic or cationic monomers, wherein each monomer has the same charge; (b) a second amount of the polymerization initiator and one or more non-ionic monomers; (c) adding a third amount of the polymerization initiator and one or more ionic monomers that are oppositely charged from the monomers of (a); adding stepwise, a fourth amount of the polymerization initiator to react any residual monomer, and (e) neutralizing the resulting polymer blend. Also claimed are heterogeneous polymer blends containing polymers formed from one or more anionic, cationic, and non-ionic monomers, either polymerized in situ or separately and then combined.

Claims7

Dependent claims

A method of making a heterogeneous polymer blend, comprising:

(a) adding to a non-neutral solution a first amount of a polymerization initiator and one or more anionic or cationic monomers, wherein each monomer has the same charge;
(b) adding a second amount of the polymerization initiator and one or more non-ionic monomers to the solution;
(c) adding a third amount of the polymerization initiator and one or more ionic monomers that are oppositely charged from the monomers of (a);
(d) adding stepwise, a fourth amount of the polymerization initiator to react any residual monomer and resulting in the heterogeneous polymer blend;
and
(e) neutralizing, if necessary, the resulting heterogeneous polymer blend.

3 more elements

Dependencies are inferred from the claim text.

Copolymer Blend Compositions for Use to Increase Paper Filler Content

Life of this patent

Copolymer Blend Compositions for Use to Increase Paper Filler Content

Life of this patent

Abstract

Claims7