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US4328136A
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US
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Process for the production of cellulose-silicate products
Assignee: Individual
•
Filing: 1981-06-22
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Granted: 1982-05-04
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Expires: 2001-06-22
Abstract
Abstract A process for impregnating and reacting cellulose particles with oxidated silicon acid to produce lignin-cellulose-silicate and/or cellulose-silicate products impregnated with hydrated silica.
Inventors
- 👤 David H. Blount
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:51
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/64; C08G18/6492; C04; C04B; C04B28/00; C04B28/24; C04B28/26; C08G18/6484; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
154 words
The process for the production of lignin-cellulose silicate products containing impregnated hydrated silica and binder by mixing and reacting the following components: (a) 1 to 100 parts by weight of an oxidated silicate compound, selected from the group of oxidized alkaline earth metal silicate, oxidized mono alkali metal silicic acid, oxidized mono alkaline earth metal silicic acid, oxidized silicic acid and mixtures thereof; (b) 50 parts by weight of plant cellulose particles, selected from the group consisting of cotton, wood cellulose, regenerated cellulose, sulfate cellulose produced by the Kraft process, sulfite cellulose, mechanical pulp cellulose, vegetable cellulose, cellulose esters and semichemical cellulose; (c) a salt-forming compound selected from the group consisting of hydrochloric and sulfuric acid and in an amount wherein the mixture of components (a), (b) and (c) has a pH of 1.5 to 5 after the reaction is complete; (d) then binder is added to the lignin-cellulose-silicate product impregnated with hydrated silica.
Claim 2
Dependent Claim
154 words
The process for the production of lignin-cellulose silicate products containing impregnated hydrated silica and binder by mixing and reacting the following components: (a) 1 to 100 parts by weight of an oxidated silicate compound, selected from the group of oxidized alkaline earth metal silicate, oxidized mono alkali metal silicic acid, oxidized mono alkaline earth metal silicic acid, oxidized silicic acid and mixtures thereof; (b) 50 parts by weight of plant cellulose particles, selected from the group consisting of cotton, wood cellulose, regenerated cellulose, sulfate cellulose produced by the Kraft process, sulfite cellulose, mechanical pulp cellulose, vegetable cellulose, cellulose esters and semichemical cellulose; (c) a salt-forming compound selected from the group consisting of hydrochloric and sulfuric acid and in an amount wherein the mixture of components (a), (b) and (c) has a pH of 1.5 to 5 after the reaction is complete; (d) then binder is added to the lignin-cellulose-silicate product impregnated with hydrated silica.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein water is added to the oxidated silicate compound, selected from the group consisting of sodium silicate and potassium silicate.
Claim 4
Dependent Claim
27 words
The process of claim 1 wherein the oxidized silicate compound is an aqueous oxidized alkali metal solution, selected from the group consisting of sodium silicate potassium silicate.
Claim 5
Dependent Claim
60 words
The process of claim 1 wherein the oxidated silicate compound is an aqueous oxidized sodium silicate solution which is mixed with the plant cellulose particles, then added to the salt-forming compound until the pH is between 1.5 and 5, thereby producing a cellulose-silicate product containing impregnated hydrated silica; the salt, water and salt-forming compound and excess binder are filtered off.
Claim 6
Dependent Claim
127 words
The process of claim 1 wherein the oxidated silicate compound is an aqueous solution of oxidized silicic acid and sodium hydroxide in the ratio of 4 to 8 parts by weight of oxidized silicic acid to 1 part by weight of sodium hydroxide, containing 1% to 10% by weight of solids, which is then added to 5% to 40% of sulfuric acid to produce an acidic solution of oxidated silicic acid with a concentration of 2% to 20% calculated as SiO 2 and a pH of 1.5 to 5; then the cellulose particles are mixed with the solution, thereby producing a lignin-cellulose-silicate product impregnated with hydrated silica; the cellulose-silicate product is recovered by filtration; then a binder is added to the lignin-cellulose-silicate product impregnated with hydrated silica.
Claim 7
Dependent Claim
23 words
The product of claim 1 wherein the components are mixed simultaneously and the resulting mixture has a pH of from 1.5 to 5.
Claim 8
Dependent Claim
9 words
The product produced by the process of claim 1.
Claim 9
Dependent Claim
24 words
The process of claim 1 wherein the cellulose particles are sodium cellulose xanthate particles which have been dissolved in an aqueous sodium hydroxide solution.
Claim 10
Dependent Claim
22 words
The process of claim 1 wherein the cellulose particles are first treated with an ammonial copper solution to form a viscous solution.
Claim 11
Dependent Claim
20 words
The process of claim 1 wherein the cellulose particles are first dissolved in a 70% to 80% sulfuric acid solution.
Claim 12
Dependent Claim
67 words
The process of claim 1 wherein the oxidized silicate compound is an aqueous solution of oxidized alkali metal silicate selected from the group consisting of sodium silicate and potassium silicate and is first reacted with the plant cellulose particles by mixing and agitating at a temperature up to the boiling point of the solution for 1 to 12 hours, thereby producing an alkali metal lignin-cellulose polymer product.
Claim 13
Dependent Claim
9 words
The product produced by the process of claim 11.
Claim 14
Dependent Claim
9 words
The product produced by the process of claim 8.
Claim 15
Dependent Claim
9 words
The product produced by the process of claim 9.
Claim 16
Dependent Claim
9 words
The product produced by the process of claim 10.
Claim 17
Dependent Claim
33 words
The process of claim 1 wherein the binder is selected from the group consisting of plastic binders, elastomer binders, plastic silicate binders, water-binding agents, alkali metal silicates, alkali metal aluminates and mixtures thereof.
Claim 18
Dependent Claim
38 words
The process of claim 16 wherein the plastic binder is selected from the group consisting of polyvinylacetates, polyacrylates, polyvinylchlorides and copolymers, polyacrylonitrile polymers, polyesters, polyamide polymers, epihalohydrin polyamine resins, phenoplast resins, aminoplast resins, epoxy resins and mixtures thereof.
Claim 19
Dependent Claim
23 words
The process of claim 16 wherein the elastomer binder is selected from the group consisting of polybutadienes, styrene-butadiene copolymers, polychloroprenes and mixtures thereof.
Claim 20
Dependent Claim
54 words
The process of claim 16 wherein the plastic silicate binder is selected from the group consisting of epihalohydrin polyamine silicate resins, allyl halide epihalohydrin polyamine silicate resins, aminoplast silicate resins, phenoplast silicate resins, polyester silicate resins, epoxy silicate resins, polyamide silicate resins, ethylenepolysulfide silicate polymer, polyacrylate silicate polymers, polyvinyl silicate polymers and mixtures thereof.
Claim 21
Dependent Claim
45 words
The process of claim 1 wherein a buffering acid having a pK between 2 and 6 which is added to the salt-forming compound is selected from the group consisting of polycarboxylic acids, complex acids of acidic sulphites and acetones, ketones and aldehydes, and mixtures thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-03 | 1985-11-02 | 1986-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-03 | 1989-11-02 | 1990-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-03 | 1993-11-02 | 1994-05-04 | $7700.00 | Window Closed / Lapsed |