Patent US3872033A successfully refreshed from Google Patents.
US3872033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamed reaction product of a resale with a sulfonated novolac
Assignee: Fibreglass Ltd
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Filing: 1972-11-16
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Granted: 1975-03-18
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Expires: 1992-11-16
Abstract
Abstract This invention provides a new phenol-formaldehyde resin particularly suitable for the production of a solid resin foam. A phenol-formaldehyde resole is hardened using an acidic composition produced by reacting a phenol with concentrated sulphuric acid and then adding formaldehyde. One part by weight of the sulphonated composition is reacted with from 0.1 to 8 parts by weight of the resole. For foam production a surfactant and foaming agent are mixed together with the sulphonated composition and the resole.
Inventors
- 👤 Philip Boden
- 👤 Peter John Crook
- 👤 Michael Edgar Hall
- 👤 Stephen Philip Riley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:52
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/18; C08J2361/00; Y; Y10; Y10S; Y10S521/00; Y10S521/907
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
141 words
A SOLID FIRE-RETARDANT PHENOL-FORMALDEHYDE RESIN FOAM PRODUCED BY REACTING A FIRST COMPOSITION WITH A RESOLE IN THE PRESENCE OF A SURFACTANT AND A FOAMING AGENT, SAID FIRST COMPOSITION ACTING AS A HARDENER FOR SAID RESOLE AND BEING PRODUCED BY REACTING A PHENOL WITH CONCENTRATED SULPHURIC ACID IN THE RATIO 0.8 TO 1.5 MOLES OF SULPHURIC ACID PER MOLE OF THE PHENOL AND THEN ADDING PER MOLE OF THE PHENOL A QUANTITY OF FORMALDEHYDE IN THE RANGE HAVING A LOWER LIMIT OF 0.3 MOLE AND AN UPPER LIMIT OF 0.8 MOLE WHEN USING 0.8 MOLE OF SULPHURIC ACID AND DECREASING TO 0.5 MOLE WHEN USING 1.5 MOLES OF SULPHURIC ACID; SAID RESOLE BEING PRODUCED BY REACTING A PHENOL AND FORMALDEHYDE IN THE RATIO OF AT LEAST 0.9 MOLE OF FORMALDEHYDE PER MOLE OF THE PHENOL IN THE PRESENCE OF A BASIC CATALYST.
Claim 2
Dependent Claim
141 words
A SOLID FIRE-RETARDANT PHENOL-FORMALDEHYDE RESIN FOAM PRODUCED BY REACTING A FIRST COMPOSITION WITH A RESOLE IN THE PRESENCE OF A SURFACTANT AND A FOAMING AGENT, SAID FIRST COMPOSITION ACTING AS A HARDENER FOR SAID RESOLE AND BEING PRODUCED BY REACTING A PHENOL WITH CONCENTRATED SULPHURIC ACID IN THE RATIO 0.8 TO 1.5 MOLES OF SULPHURIC ACID PER MOLE OF THE PHENOL AND THEN ADDING PER MOLE OF THE PHENOL A QUANTITY OF FORMALDEHYDE IN THE RANGE HAVING A LOWER LIMIT OF 0.3 MOLE AND AN UPPER LIMIT OF 0.8 MOLE WHEN USING 0.8 MOLE OF SULPHURIC ACID AND DECREASING TO 0.5 MOLE WHEN USING 1.5 MOLES OF SULPHURIC ACID; SAID RESOLE BEING PRODUCED BY REACTING A PHENOL AND FORMALDEHYDE IN THE RATIO OF AT LEAST 0.9 MOLE OF FORMALDEHYDE PER MOLE OF THE PHENOL IN THE PRESENCE OF A BASIC CATALYST.
Claim 3
Dependent Claim
32 words
A phenol-formaldehyde resin foam according to claim 1, wherein the surfactant is a silicone oil and is present in the proportion 0.2 to 5.0 parts by weight per 100 parts of resin.
Claim 4
Dependent Claim
28 words
A resin foam according to claim 1, wherein the silicone oil surfactant is present in the proportion 0.5 to 2.0 parts by weight per 100 parts of resin.
Claim 5
Dependent Claim
50 words
A resin foam according to claim 1, wherein the foaming agent is a low boiling point liquid which is vaporised by exothermic heat generated in the reaction of the composition with the resole, and is present in the proportion 5 to 45 parts by weight per 100 parts of resin.
Claim 6
Dependent Claim
22 words
A resin according to claim 4, wherein the foaming agent is selected from low boiling point aliphatic hydrocarbons and halogenated derivatives thereof.
Claim 7
Dependent Claim
36 words
A resin foam according to claim 5, wherein the foaming agent consists of one or more compounds selected from the group consisting of CCl4, CCl3F, CCl2F2, CF2ClCFCl2, C2Cl2F4, CHCl2F, CH2Cl2, CH3Cl, C5H12, C6H14, C7H16 and C6H5SO2NHNH2.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |