US4424289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous process for the manufacture of quick-setting phenolic foams
Assignee: Norsolor SA
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Filing: 1982-05-14
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Granted: 1984-01-03
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Expires: 2002-05-14
Abstract
Abstract A continuous process for manufacturing quick-setting phenolic foams is improved by using as the hardening agent a concentrated, substantially anhydrous solution of boron trioxide, and using as the blowing agent an organic liquid having a boiling point of 20°-80° C. Curing times are shortened and the resultant foam, having uniformly molecularly dispersed therein about 0.25-10.5% by weight of boron, calculated as boric anhydride, has substantially uniform cells, improved fire resistance characteristics and superior mechanical properties.
Inventors
- 👤 Nicolas Meyer
- 👤 Gilbert Wollaert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:57
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/141; C08J9/143; C08L; C08L61/00; C08L61/04; C08L61/06; C08J2361/00; C08J2361/04; C08J2361/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
129 words
In a continuous process for manufacturing a phenolic foam, comprising mixing a liquid phenolic resol, a blowing agent and a hardener; continuously depositing the resultant mixture on a belt; continuously expanding and hardening the mixture to form a phenolic foam; and recovering the resultant foam, the improvement wherein said blowing agent is an organic liquid having a boiling point of 20°-80° C.; and said hardener is a concentrated, substantially anhydrous boric anhydride solution comprising: (A) at least 5% by weight of boric anhydride; (B) an organic solvent, said solvent being a monoalcohol, a polyalcohol, a trialkylborate, a dialkyl acetal of formaldehyde or a mixture thereof; and (C) 5-70% by weight, based on the weight of hardener solution, of concentrated sulfuric acid, an aromatic sulfonic acid or a mixture thereof.
Claim 2
Dependent Claim
129 words
In a continuous process for manufacturing a phenolic foam, comprising mixing a liquid phenolic resol, a blowing agent and a hardener; continuously depositing the resultant mixture on a belt; continuously expanding and hardening the mixture to form a phenolic foam; and recovering the resultant foam, the improvement wherein said blowing agent is an organic liquid having a boiling point of 20°-80° C.; and said hardener is a concentrated, substantially anhydrous boric anhydride solution comprising: (A) at least 5% by weight of boric anhydride; (B) an organic solvent, said solvent being a monoalcohol, a polyalcohol, a trialkylborate, a dialkyl acetal of formaldehyde or a mixture thereof; and (C) 5-70% by weight, based on the weight of hardener solution, of concentrated sulfuric acid, an aromatic sulfonic acid or a mixture thereof.
Claim 3
Dependent Claim
30 words
A process according to claim 1, wherein said blowing agent is n-pentane, a petroleum fraction having a boiling point of 25°-70° C., a chlorofluoromethane, a chlorofluoroethane or a mixture thereof.
Claim 4
Dependent Claim
21 words
A process according to claim 1, wherein the amount of said blowing agent is 1-15% by weight relative to said resol.
Claim 5
Dependent Claim
16 words
A process according to claim 3, wherein said amount of blowing agent is 5-10% by weight.
Claim 6
Dependent Claim
29 words
A process according to claim 1, wherein said hardener solution comprises 10-35% by weight of boric anhydride; 15-50% by weight of acid; and 30-60% by weight of organic solvent.
Claim 7
Dependent Claim
21 words
A process according to claim 1, wherein the amount of said hardener solution is 5-30% by weight relative to said resol.
Claim 8
Dependent Claim
17 words
A process according to claim 4, wherein the amount of said hardener solution is 10-25% by weight.
Claim 9
Dependent Claim
20 words
A process according to claim 1, wherein the resol mixture is expanded and hardened at a temperature of 10°-100° C.
Claim 10
Dependent Claim
12 words
A process according to claim 8, wherein said temperature is 20°-80° C.
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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) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |