Cellulose fibres for cement reinforcement
US4647505A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 16, 1984 |
| Grant date | Mar 3, 1987 |
| Priority date | — |
| Expiry date | Oct 16, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2971
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Cellulose fibres such as wood pulp are made more suitable for reinforcement of cement products by a treatment which reduces their swelling in aqueous and alkaline mediums. The fibres are dispersed in water, allowed to swell, and impregnated with a solution of a titanium and/or zirconium chelate compound. After drying, the fibres are heated to react the chelate compound(s) with the hydroxyl groups on the cellulose fibres, preferably to produce cross-linking between hydroxyl group residues. The treated fibres are more stable in cement media, and, despite their increased hydrophobicity, are dispersible in cement slurries to give good web formation in the manufacture of cement products such as sheet. They impart improved flexural strength and modulus to cement products compared with untreated cellulose reinforcing fibres.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.