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US4314916A
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US
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Process for the production of broken down lignin-cellulose silicate copolymers
Assignee: Individual
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Filing: 1981-04-27
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Granted: 1982-02-09
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Expires: 2001-04-27
Abstract
Abstract Small particles of cellulose-containing plants and an oxidated silicon compound are mixed with an alkali metal hydroxide then heated to 150° to 220° C. while agitating thereby producing an alkali metal broken down lignin-cellulose silicate polymer which is then reacted with a polysubstituted organic compound to produce a broken down lignin-cellulose silicate copolymer.
Inventors
- 👤 David H. Blount
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:24
CPC Classifications
C; C08; C08H; C08H6/00; C08B; C08B15/00; C08B15/05; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/64; C08G18/6484; C08J; C08J9/00; C08J9/02; C08G2101/00; C08J2301/00; C08J2301/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
125 words
The process for the production of polyurethane silicate product by the following steps: (a) mixing and reacting a broken down alkali metal lignin-cellulose silicate polymer and a substituted organic compound having at least two carbon atoms, each of which is attached to a substituent which will split off during the reaction, to said broken down alkali metal lignin-cellulose silicate polymer in the amount wherein the mols of the substituent radicals are about equal to the mols of the alkali radicals in the mixture thereby producing a broken down lignin-cellulose silicate copolymer; (b) mixing and reacting 1 to 95 parts by weight of the broken down lignin-cellulose silicate copolymer and 50 parts by weight of a polyisocyanate or a polyisothiocyanate thereby producing a polyurethane silicate product.
Claim 2
Dependent Claim
125 words
The process for the production of polyurethane silicate product by the following steps: (a) mixing and reacting a broken down alkali metal lignin-cellulose silicate polymer and a substituted organic compound having at least two carbon atoms, each of which is attached to a substituent which will split off during the reaction, to said broken down alkali metal lignin-cellulose silicate polymer in the amount wherein the mols of the substituent radicals are about equal to the mols of the alkali radicals in the mixture thereby producing a broken down lignin-cellulose silicate copolymer; (b) mixing and reacting 1 to 95 parts by weight of the broken down lignin-cellulose silicate copolymer and 50 parts by weight of a polyisocyanate or a polyisothiocyanate thereby producing a polyurethane silicate product.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein the polyisocyanate is selected from the group consisting of aliphatic, cycloaliphatic, araliphatic, aromatic and heterocyclic polyisocyanates and mixtures thereof.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein the polyisocyanate is a phosgenation product of aniline-formaldehyde condensation.
Claim 5
Dependent Claim
9 words
The product produced by the process of claim 1.
Claim 6
Dependent Claim
29 words
The process of claim 1 wherein 1 to 95% parts by weight of a polyol is added in step (b) of claim 1 with the broken-down lignin-cellulose silicate polymer.
Claim 7
Dependent Claim
9 words
The product produced by the process of claim 5.
Claim 8
Dependent Claim
47 words
The process of claim 1 wherein up to 50% by weight of a curing agent and up to 10% by weight of an activator, percentage based on the weight of the reactants, are added with the broken down lignin-cellulose silicate copolymer in step (b) of claim 1.
Claim 9
Dependent Claim
33 words
The process of claim 1 wherein up to 200 parts by weight of a water-binding agent are added to the broken down lignin-cellulose silicate copolymer or polyisocyanate in step (b) of claim 1.
Claim 10
Dependent Claim
9 words
The product produced by the process of claim 8.
Claim 11
Dependent Claim
39 words
The process of claim 5 wherein the polyol is selected from the group consisting of polyether glycols, polyhydric alcohols, castor oil, and polyesters, polyamides, polyacetals and polycarbonates which contain 2 or more hydroxyl groups per molecule and mixtures thereof.
Claim 12
Dependent Claim
24 words
The process of claim 8 wherein the water-binding agent is selected from the group consisting of hydraulic cement, synthetic anhydride, gypsum and burnt lime.
Claim 13
Dependent Claim
28 words
The process of claim 1 wherein the polyisocyanate is first reacted with a polyol to produce an isocyanate-terminated polyurethane prepolymer then added in step (b) of claim 1.
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) | 1985-02-08 | 1985-08-10 | 1986-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-08 | 1989-08-10 | 1990-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-08 | 1993-08-10 | 1994-02-09 | $7700.00 | Window Closed / Lapsed |