US4355145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furan resins of improved fire resistance
Assignee: Norsolor SA
•
Filing: 1981-04-22
•
Granted: 1982-10-19
•
Expires: 2001-04-22
Abstract
Abstract Furan resins of improved fire resistance are produced by curing the resins with a substantially anhydrous solution of boric anhydride, an organic solvent and a concentrated acid.
Inventors
- 👤 Nicolas Meyer
- 👤 Michel Cousin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:32
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/38
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
48 words
In a process of hardening furan resins by using acidic catalysts, the improvement which comprises using as the acidic catalyst a substantially anhydrous concentrated boric anhydride solution comprising at least 5 percent by weight of boric anhydride, at least one organic solvent and at least one concentrated acid.
Claim 2
Dependent Claim
48 words
In a process of hardening furan resins by using acidic catalysts, the improvement which comprises using as the acidic catalyst a substantially anhydrous concentrated boric anhydride solution comprising at least 5 percent by weight of boric anhydride, at least one organic solvent and at least one concentrated acid.
Claim 3
Dependent Claim
28 words
A process according to claim 1, wherein the amount of the catalyst solution used is from 0.5 to 10 percent by weight with respect to the furan resin.
Claim 4
Dependent Claim
71 words
A process according to claim 1, wherein the anhydrous boric anhydride solution comprises (1) at least 5 percent by weight of boric anhydride; (2) at least one solvent, the solvent being a monoalcohol, a polyalcohol, a trialkylborate, a dialkylacetal of formaldehyde or a mixture thereof; and (3) from 5 to 70 percent by weight, based on the weight of the solution, of sulfuric acid, a sulfonic acid or a mixture thereof.
Claim 5
Dependent Claim
28 words
A process according to claim 3, wherein the amount of the catalyst solution used is from 0.5 to 10 percent by weight with respect to the furan resin.
Claim 6
Dependent Claim
17 words
A process according to claim 2, wherein said amount is from 1 to 6 percent by weight.
Claim 7
Dependent Claim
12 words
A hardened furan resin as obtained by the process of claim 1.
Claim 8
Dependent Claim
12 words
A hardened furan resin as obtained by the process of claim 2.
Claim 9
Dependent Claim
12 words
A hardened furan resin as obtained by the process of claim 3.
Claim 10
Dependent Claim
12 words
A hardened furan resin as obtained by the process of claim 4.
Claim 11
Dependent Claim
12 words
A hardened furan resin as obtained by the process of claim 5.
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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) | 1985-10-18 | 1986-04-19 | 1986-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-18 | 1990-04-19 | 1990-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-18 | 1994-04-19 | 1994-10-19 | $7700.00 | Window Closed / Lapsed |