Anionic copolymers prepared in an inverse emulsion matrix and their use in preparing cellulosic fiber compositions

• US 7,250,448 B2
• Filed: 12/06/2002
• Issued: 07/31/2007
• Est. Priority Date: 12/07/2001
• Status: Expired due to Term

• Current Assignee: Solenis Technologies LP (Innovative Water Care, LLC)
• Original Assignee: Hercules Incorporated (Ashland Global Holdings, Inc.)
• Inventors: Carey, William Sean, Brady, Richard Lee, Zhang, Fushan, Harrington, John C., Walchuk, Brian
• Primary Examiner(s): FORTUNA, JOSE A
• Application Number:
  US10/313,632
• Publication Number:
  US 20040102528A1
• Time in Patent Office: 1,698 Days
• Field of Search: 524521-522, 524/801, 524/832, 526/72, 526/80, 526/81, 526/207, 526/213, 526/217, 526/310, 526/916, 516 20- 22, 210/702, 210/708
• US Class Current: 516/20
• CPC Class Codes: C08F 2/24 with the aid of emulsifying agents
• CPC Class Codes: C08F 2/32 Polymerisation in water-in-oil emulsions
• CPC Class Codes: C08F 20/56 Acrylamide; Methacrylamide
• CPC Class Codes: C08F 220/06 Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
• CPC Class Codes: C08F 220/56 Acrylamide; Methacrylamide
• CPC Class Codes: D21H 17/42 anionic
• CPC Class Codes: D21H 17/43 Carboxyl groups or derivatives thereof
• CPC Class Codes: D21H 21/10 Retention agents or drainage improvers
• CPC Class Codes: Y10S 526/916 Interpolymer from at least three ethylenically unsaturated monoolefinic hydrocarbon monomers

Abstract

A papermaking method and a composition which utilize, as a drainage aid, a water-soluble anionic copolymer prepared via a water-in-oil polymerization technique that, absent a cross-linking agent, is characterized by a Huggins'"'"' constant (k′) determined in 0.01M NaCl greater than 0.75 and a storage modulus (G′) for a 1.5 wt. % actives polymer solution at 4.6 Hz greater than 175 Pa.

Claims

1. A water-soluble copolymer composition comprising

at least one associative inverse emulsion anionic copolymer, wherein the associative properties of the at least one associative inverse emulsion anionic copolymer are provided by an effective amount of at least one emulsification surfactant chosen from diblock and triblock polymeric surfactants wherein said at least one associative inverse emulsion anionic copolymer comprises:

at least one nonionic polymer segment B comprised of one or more ethylenically unsaturated nonionic monomers, and

at least one anionic polymer segment F comprised of one or more ethylenically unsaturated anionic monomers;

the molar % ratio of B;

F is from 95;

5 to 5;

95; and

wherein said at least one associative inverse emulsion anionic copolymer has a Huggins'"'"' constant (k′

) determined in 0.01 M NaCl greater than 0.75; and

said at least one associative inverse emulsion anionic copolymer has a storage modulus (G′

) in a 1.5 wt. % actives polymer solution at 4.6 Hz greater than 175 Pa.

2. The composition of claim 1 wherein B is selected from the group consisting of acrylamide, methacrylamide;

N-alkylacrylamides, N,N-dialkyl-acrylamide;

methyl methacrylate, methyl acrylate;

acrylonitrile;

N-vinyl methylacetamide;

N-vinyl methyl formamide;

vinyl acetate;

N-vinyl pyrrolidone; and

mixtures of any of the foregoing.

3. The composition of claim 1 wherein F is selected from the group consisting of the free acids and salts of acrylic acid;

methacrylic acid;

maleic acid;

itaconic acid;

acrylamidoglycolic acid;

2-acrylamido-2-methyl-1-propanesulfonic acid;

3-allyloxy-2-hydroxy-1-propanesulfonic acid;

styrenesulfonic acid;

vinylsulfonic acid;

vinylphosphonic acid;

2-acrylamido-2-methyipropane phosphonic acid; and

mixtures of any of the foregoing.

4. The composition of claim 1 wherein the diblock or triblock surfactant is a copolymer based on polyester derivatives of fatty acids and poly[ethyleneoxide].

5. The composition of claim 1 wherein the pH is from about 3 to about 6.

6. The composition of claim 1 wherein diblock or triblock surfactant to monomer ratio is at least about 3:

100.

7. The composition of claim 1 wherein the nonionic polymer segment B is acrylamide and the anionic polymer segment F is selected from the group consisting of the sodium, potassium or ammonium salt of acrylic acid.