Fine particle size lime slurries and their production

• US 7,740,743 B2
• Filed: 11/04/2005
• Issued: 06/22/2010
• Est. Priority Date: 11/15/2004
• Status: Expired due to Fees

• Current Assignee: CIBA Specialty Chemicals Water Treatments Limited (BASF SE)
• Original Assignee: CIBA Specialty Chemicals Water Treatments Limited (BASF SE)
• Inventors: Reynolds, Valerie, Cockcroft, Robert, Northfleet, Christina, Symes, Kenneth, Herren, Fritz, Singh, Michael, McCann, Andrew, Donnelly, Simon
• Primary Examiner(s): Eashoo; Mark
• Assistant Examiner(s): Heincer; Liam J
• Application Number:
  US11/666,871
• Publication Number:
  US 20070265407A1
• Time in Patent Office: 1,691 Days
• Field of Search: 526/312, 526/316, 526/72, 162/168.1, 162/174
• US Class Current: 162/174
• CPC Class Codes: C08F 220/56 Acrylamide; Methacrylamide
• CPC Class Codes: D21H 17/22 Proteins
• CPC Class Codes: D21H 17/35 Polyalkenes, e.g. polystyrene
• CPC Class Codes: D21H 17/37 Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
• CPC Class Codes: D21H 21/18 Reinforcing agents
• CPC Class Codes: D21H 21/20 Wet strength agents

Abstract

A polymer comprising i) a synthetic polymeric component that has been formed from an ethylenically unsaturated water-soluble or potentially water-soluble monomer and an ethylenically unsaturated monomer carrying a reactive group, wherein the reactive group is directly reactive with a cellulose binding domain protein; and ii) a protein component consisting of a cellulose binding domain protein, wherein the cellulose binding domain protein. The polymer is particularly suitable as a dry strength resin in a paper making process. It can also be used as a wet strength resin, internal sizing agent or surface sizing agent.

Claims

1. A method of improving the strength of paper produced in a paper making process which process comprises providing a cellulosic suspension comprising cellulosic fibres and optionally fillers, including a dry strength resin, and then dewatering the cellulosic suspension on a wire or mesh to form a sheet and drying the sheet, in which the dry strength resin is a polymer comprising

i) a synthetic polymeric component that has been formed from an ethylenically unsaturated water-soluble or potentially water-soluble monomer and an ethylenically unsaturated monomer carrying a reactive group, wherein the reactive group is directly reactive with a cellulose binding domain protein;

and

ii) a protein component comprising a cellulose binding domain protein, wherein the cellulose binding domain protein is covalently bonded to the synthetic polymer component through one or more of the reactive groups.

2. A method according to claim 1 in which the reactive group is selected from the group consisting of epoxides, isocyanates and amido methylol groups.

3. A method of improving the wet strength of paper produced in a paper making process which process comprises providing a cellulosic suspension comprising cellulosic fibres and optionally fillers, including a wet strength resin, and then dewatering the cellulosic suspension on a wire or mesh to form a sheet and drying the sheet, in which the wet strength resin is a polymer comprising

i) a synthetic polymeric component that has been formed from an ethylenically unsaturated water-soluble or potentially water-soluble monomer and an ethylenically unsaturated monomer carrying a reactive group, wherein the reactive group is directly reactive with a cellulose binding domain protein;

and

ii) a protein component comprising a cellulose binding domain protein, wherein the cellulose binding domain protein is covalently bonded to the synthetic polymer component through one or more of the reactive groups.

4. A method according to claim 3 in which the reactive group is selected from the group consisting of epoxides, isocyanates and amido methylol groups.

5. A method of internally sizing paper produced in a paper making process which process comprises providing a cellulosic suspension comprising cellulosic fibres and optionally fillers, including internal sizing agent, and then dewatering the cellulosic suspension on a wire or mesh to form a sheet and drying the sheet, in which the internal sizing agent is a polymer comprising

i) a synthetic polymeric component that has been formed from an ethylenically unsaturated water-soluble or potentially water-soluble monomer and an ethylenically unsaturated monomer carrying a reactive group, wherein the reactive group is directly reactive with a cellulose binding domain protein;

and

ii) a protein component comprising a cellulose binding domain protein, wherein the cellulose binding domain protein is covalently bonded to the synthetic polymer component through one or more of the reactive groups.

6. A method according to claim 5 in which the reactive group is selected from the group consisting of epoxides, isocyanates and amido methylol groups.

7. A method of surface sizing paper which method comprises applying a surface sizing agent to the surface of a formed cellulosic sheet, in which the surface sizing agent is a polymer comprising:

i) a synthetic polymeric component that has been formed from an ethylenically unsaturated water-soluble or potentially water-soluble monomer and an ethylenically unsaturated monomer carrying a reactive group, wherein the reactive group is directly reactive with a cellulose binding domain protein; and

ii) a protein component comprising a cellulose binding domain protein, wherein the cellulose binding domain protein is covalently bonded to the synthetic polymer component through one or more of the reactive groups.

8. A method according to claim 7 in which the reactive group is selected from the group consisting of epoxides, isocyanates and amido methylol groups.