US4439348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst system for furan resins
Assignee: Penn Specialty Chemicals Inc
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Filing: 1982-02-05
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Granted: 1984-03-27
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Expires: 2002-02-05
Abstract
Abstract A catalytic system for furan resin is disclosed, comprising mixtures of a sulfonic acid with urea salts of the respective sulfonic acid. By varying the acid:salt ratio of the catalytic system, the working time of the furan resin may be controlled as desired.
Inventors
- 👤 Denis W. Akerberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:10
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/41; C08K5/42
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
93 words
A catalytic system for curing a furan polymer concrete comprising a silica aggregate, silica flour, and a furan resin wherein said catalyst system comprises a mixture of an aromatic sulfonic acid selected from the group consisting of phenolsulfonic acid, benzenesulfonic acid, toluenesulfonic acid, and xylenesulfonic acid, and urea salt of said aromatic sulfonic acid, wherein the sulfonic acid is combined with urea salt in a ratio of acid to salt from 1/1 to 1/10, thereby controlling the catalytic activity of said system for regulation of the working life of said furan polymer concrete.
Claim 2
Dependent Claim
93 words
A catalytic system for curing a furan polymer concrete comprising a silica aggregate, silica flour, and a furan resin wherein said catalyst system comprises a mixture of an aromatic sulfonic acid selected from the group consisting of phenolsulfonic acid, benzenesulfonic acid, toluenesulfonic acid, and xylenesulfonic acid, and urea salt of said aromatic sulfonic acid, wherein the sulfonic acid is combined with urea salt in a ratio of acid to salt from 1/1 to 1/10, thereby controlling the catalytic activity of said system for regulation of the working life of said furan polymer concrete.
Claim 3
Dependent Claim
28 words
The catalytic system of claim 1 wherein the urea salt of the aromatic sulfonic acid comprises a 50% aqueous solution of the urea salt of the sulfonic acid.
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) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |