Fibrous sheet binders
AssigneeArmstrong World Industries, Inc.
InventorsKenneth P. Kehrer, Sheldon M. Atlas, Victor A. Kabanov, Alexander Zezin, Valentine Rogachova
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Abstract
A method and composition are disclosed for providing a two-part polymer binder additive for a fibrous sheet for improving both its strength and durability. The two-part polymer binder may be added to augment organic binders to increase board strength and durability or to reduce the amount of organic binder required. The polymers may also be added in place of conventional organic binders or added in addition to organic binders to improve sag resistance and fibrous sheet performance.
Claims43
A polymer binder for a fibrous sheet comprising:
- an anionic polymer having a negative charge of between about 4 to about 12 milliequivalents per gram;
- and
- a cationic polymer having a positive charge of between about 6 to about 12 milliequivalents per gram.
A method of forming a fibrous sheet comprising:
- forming a fibrous slurry;
- mixing into the fibrous slurry an anionic polymer having a negative charge of between about 4 to about 12 milliequivalents per gram;
- mixing into the fibrous slurry a cationic polymer having a positive charge of between about 6 to about 12 milliequivalents per gram;
- and
- drying the fibrous sheet to form the fibrous sheet.
A fibrous sheet comprising:
- at least one type of fiber;
- an anionic polymer having a negative charge of between about 4 to about 12 milliequivalents per gram;
- and
- a cationic polymer having a positive charge of between about 6 to about 12 milliequivalents per gram.
Dependencies are inferred from the claim text.