IP Library › Granted Patent US 8,293,003
Granted Patent B1
US 8,293,003 · App. 13/571,234 · Granted Oct 23, 2012

Method of making a fiber cement board with improved properties and the product

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Quick Facts
Patent No.
US 8,293,003
App. No.
13/571,234
Granted
Oct 23, 2012
Kind
B1
Abstract

A cement product incorporating nanocrystalline cellulose and cellulose fiber throughout the product and a method of making the product.

Claims (9)

1. A method of manufacturing a composite building material, comprising:

providing cellulose fibers;

providing a nanocrystalline cellulose;

mixing the cellulose fibers and the nanocrystalline cellulose with a cementitious binder to form a cement mixture;

forming the cement mixture into a cement article of a pre-selected shape and size; and

curing the cement article so as to form the composite building material.

2. The method of claim 1 wherein the cement article is cured in an autoclave.

3. The method of claim 1 wherein the nanocrystalline cellulose is present in an amount of 0.05% to 3% by weight based on the weight of the total dry solids in the cementitious matrix.

4. The method of claim 1 wherein the cellulose fibers are present in the amount of 5 to 10 percent by weight based on the weight of the total dry solids in the cementitious matrix.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 5, 2019
From: WEYERHAEUSER NR COMPANY
To: INTERNATIONAL PAPER COMPANY
Reel/Frame 049964/0838 →