Patent US4272403A successfully refreshed from Google Patents.
US4272403A
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US
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Boric anhydride solutions and their use as hardeners of resols
Assignee: Cray Valley SA
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Filing: 1979-06-15
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Granted: 1981-06-09
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Expires: 1999-06-15
Abstract
Abstract Concentrated boric anhydride solutions containing more than 5% of boric anhydride in an organic solvent selected from mono or polyalcohols, trialkylborate and/or dialkylacetal when the solvent also contains an acid selected from sulfuric acid and/or aromatic acids. These solutions are used as hardeners of formo-phenolic resols, more particularly for the manufacture of laminates comprising glass fibers and formo-phenolic resols.
Inventors
- 👤 Nicolas Meyer
- 👤 Raymond Foulon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:01
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/38; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31627; Y10T428/31942
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
71 words
A concentrated, substantially anhydrous boric anhydride solution which comprises (1) at least 5 percent by weight of boric anhydride; (2) at least one solvent selected from the group consisting of mono alcohols, poly alcohols, trialkylborates and dialkyl acetals of formol; and (3) from 5 to 70 percent by weight, based on the weight of solution, of at least one acid selected from the group consisting of sulfuric acid and sulfonic acids.
Claim 2
Dependent Claim
71 words
A concentrated, substantially anhydrous boric anhydride solution which comprises (1) at least 5 percent by weight of boric anhydride; (2) at least one solvent selected from the group consisting of mono alcohols, poly alcohols, trialkylborates and dialkyl acetals of formol; and (3) from 5 to 70 percent by weight, based on the weight of solution, of at least one acid selected from the group consisting of sulfuric acid and sulfonic acids.
Claim 3
Dependent Claim
27 words
A concentrated boric anhydride solution according to claim 1, wherein the amount of acid is at least 10 percent by weight based on the weight of solution.
Claim 4
Dependent Claim
28 words
A concentrated boric anhydride solution according to claim 1, wherein the amount of acid is from 15 to 50 percent by weight based on the weight of solution.
Claim 5
Dependent Claim
22 words
A concentrated boric anhydride solution according to claim 1, wherein the boric anhydride concentration is from 10 to 35 percent by weight.
Claim 6
Dependent Claim
38 words
A concentrated boric anhydride solution according to claim 1, which comprises: 10 to 35 percent by weight of boric anhydride; 15 to 50 percent by weight of acid; and 30 to 60 percent by weight of organic solvent.
Claim 7
Dependent Claim
20 words
A concentrated boric anhydride solution according to claim 1, wherein the solvent is a mixture of trimethyl borate and methanol.
Claim 8
Dependent Claim
20 words
A concentrated boric anhydride solution according to claim 1, wherein the solvent is a mixture of trimethyl borate and methylal.
Claim 9
Dependent Claim
20 words
A concentrated boric anhydride solution according to claim 5, wherein the solvent is a mixture of trimethyl borate and methanol.
Claim 10
Dependent Claim
20 words
A concentrated boric anhydride solution according to claim 5, wherein the solvent is a mixture of trimethyl borate and methylal.
Claim 11
Dependent Claim
15 words
A concentrated boric anhydride solution according to claim 1, wherein the acid is sulfuric acid.
Claim 12
Dependent Claim
15 words
A concentrated boric anhydride solution according to claim 5, wherein the acid is sulfuric acid.
Claim 13
Dependent Claim
15 words
A concentrated boric anhydride solution according to claim 1, wherein the acid is para-toluenesulfonic acid.
Claim 14
Dependent Claim
15 words
A concentrated boric anhydride solution according to claim 5, wherein the acid is para-toluenesulfonic acid.
Claim 15
Dependent Claim
11 words
A solution according to claim 1, which is clear and anhydrous.
Claim 16
Dependent Claim
11 words
A solution according to claim 4, which is clear and anhydrous.
Claim 17
Dependent Claim
11 words
A solution according to claim 5, which is clear and anhydrous.
Claim 18
Dependent Claim
17 words
A solution according to claim 1, wherein the said at least one solvent comprises a trialkyl borate.
Claim 19
Dependent Claim
17 words
A solution according to claim 14, wherein the said at least one solvent comprises a trialkyl borate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-08 | 1984-12-08 | 1985-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-08 | 1988-12-08 | 1989-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-08 | 1992-12-08 | 1993-06-09 | $7700.00 | Window Closed / Lapsed |