Precipitated calcium carbonate-cationic starch binder as retention aid system for papermaking

• US 4,892,590 A
• Filed: 06/03/1988
• Issued: 01/09/1990
• Est. Priority Date: 06/03/1988
• Status: Expired due to Term

• Current Assignee: Minerals Technologies Incorporated
• Original Assignee: Pfizer Inc.
• Inventors: Sanders, Nigel D., Gill, Robert A.
• Primary Examiner(s): Morris, Theodore
• Application Number:
  US07/202,175
• Time in Patent Office: 585 Days
• Field of Search: 106/464, 106/214, 106/468, 162/175
• US Class Current: 106/217.01
• CPC Class Codes: C01P 2004/61 Micrometer sized, i.e. from 1-100 micrometer
• CPC Class Codes: C01P 2004/62 Submicrometer sized, i.e. from 0.1-1 micrometer
• CPC Class Codes: C01P 2006/12 Surface area
• CPC Class Codes: C09C 1/021 Calcium carbonates
• CPC Class Codes: D21H 17/29 cationic
• CPC Class Codes: D21H 17/675 Oxides, hydroxides or carbonates
• CPC Class Codes: D21H 21/10 Retention agents or drainage improvers
• CPC Class Codes: D21H 21/18 Reinforcing agents

Abstract

A two component binder system comprising a highly dispersible, high specific surface area precipitated calcium carbonate (colloidal PCC) and a cationic starch, especially a cationic potato starch, for improving filler retention, opacity and strength during papermaking.

Claims

1. A binder system for use in a papermaking process, said system comprising a highly dispersible, high surface area precipitated calcium carbonate and a cationic starch. Wherein the precipitated calcium carbonate has a surface area of from 10 m² /g-200 m² /g and the ratio of precipitated calcium carbonate:

cationic starch is 2;

1 to 1;

20 by weight.

2. A binder system according to claim 1 wherein the cationic starch is a cationic potato starch.

3. A binder system according to claim 2 wherein the cationic potato starch has a degree of substitution of from about 0.10% to about 0.50%.

4. A binder system according to claim 3 wherein the precipitated calcium carbonate has a surface area of 50-90 m² /g, a mean particle size of 0.1-0.3 μ

m and a zeta potential of -10 to -60 mV;

the cationic starch a degree of substitution of 0.30% to 0.40% and the ratio of precipitated calcium carbonate;

cationic starch is 4 by weight.