Cellulose and cellulose products modified by silicic acid
OwnerOlof Sundeninventor
Life of this patent
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Abstract
A method for modifying the physical characteristics of cellulose materials by the impregnation of the cellulose fibers with acidic solutions of monomer and oligomeric silicic acid to form a capillary cellulose-polysilicic acid structure to which selective binder materials may be adhered.
Claims15
A composition comprising cellulose fibers, polysilicic acid, and a binder material, said cellulose fibers and polysilicic acid forming a cellulose polysilicic acid capillary structure having an internal capillarity corresponding to a BET-surface of 200-800 m.sup.2 /g polysilicic acid by absorbing a water based solution of monomer and oligomer silicic acids having a pH of between 1 and 5 into said cellulose fibers and polycondensating said monomer and oligomer silicic acids, and said binder material being adhered to said capillary structure.
A composition comprising cellulose fibers, polysilicic acid and a buffering acid, said buffering acid having a pK between 2 and 6 and which is decomposable upon drying to form a less acidic residue, and said cellulose fibers and polysilicic acid forming a cellulose-polysilicic acid capillary structure having an internal capillarity corresponding to a BET-surface of 200-800 m.sup.2 /g polysilicic acid.
The method of manufacturing compositions of cellulose fibers and a binder material comprising the following steps:
- (a) Impregnating cellulose fibers with a water base solution of monomer and oligomer silicic acids at a pH of 1-5 and having a silicic acid concentration of 3-15% calculated as SiO.sub.2 ;
- (b) Polycondensating the monomer and oligomer silicic acid absorbed by the cellulose to form a hydrated cellulose-polysilicic acid structure which is insoluble in water;
- (c) Adding the binder while the cellulose-polysilicic acid structure is hydrated;
- (d) Drying the composition to form a cellulose-polysilicic acid structure having an internal capillary structure with a BET-surface of 200-800 m.sup.2 /g silicic acid in which the binder is adhered.
The method of manufacturing compositions of cellulose fibers and a binder material comprising the steps of:
- (a) Impregnating cellulose fibers in the form of cellulose sheets wiith a water base solution of monomer and oligomer silicic acids at a pH of 1-5 and having a silicis acid concentration of 3-15% calculated as SiO.sub.2 ;
- (b) Adding a buffering acid having a pK value of between 2 and 6 and which is decomposable to a less acidic residue upon drying;
- (c) Drying the impregnated cellulose sheet to polycondensate the silicic acid monomers and oligomers to form a hydrated cellulose-polysilicic acid capillary structure into which excess monomer and oligomer silicic acid is adhered as a binding material.
Dependencies are inferred from the claim text.