US4166162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenolic resin foam having reduced tendency to shrink
Assignee: Dynamit Nobel AG
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Filing: 1977-12-06
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Granted: 1979-08-28
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Expires: 1997-12-06
Abstract
Abstract Foamed phenolic resins containing CaSO 4 . nH 2 O, where n is 0-2, having reduced tendency to shrink and reduced weight loss on aging.
Inventors
- 👤 Franz Weissenfels
- 👤 Hans Junger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:18
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C08J2361/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
40 words
Phenolic resin foam having improved dimensional stability having dispersed therein CaSO 4 .nH 2 O, wherein n is less than 2, in an amount of about 5-50% of the weight of the solid resin content of the phenolic resol resin.
Claim 2
Dependent Claim
40 words
Phenolic resin foam having improved dimensional stability having dispersed therein CaSO 4 .nH 2 O, wherein n is less than 2, in an amount of about 5-50% of the weight of the solid resin content of the phenolic resol resin.
Claim 3
Dependent Claim
12 words
Phenolic resin foam according to claim 1, n being 0 to 1/2.
Claim 4
Dependent Claim
12 words
Phenolic resin foam according to claim 2, said amount being about 10-30%.
Claim 5
Dependent Claim
32 words
Phenolic resin foam according to claim 1, the shrinkage thereof being less than about 4%, the weight loss for 28 days, at 20° C. and 65% relative humidity being less than 14%.
Claim 6
Dependent Claim
32 words
Phenolic resin foam according to claim 3, the shrinkage thereof being less than about 4%, the weight loss for 28 days, at 20° C. and 65% relative humidity being less than 14%.
Claim 7
Dependent Claim
77 words
In a process for production of phenolic resin foam according to claim 1, having reduced shrinkage and weight loss, which comprises foaming a mixture of liquid resol phenolic resin, a blowing agent, a hardener, and a surface active agent, wherein the improvement comprises including in said mixture pulverized CaSO 4 .nH 2 O wherein n is less than 2, in an amount of about 5-50% by weight of the solid resin content of the phenolic resol resin.
Claim 8
Dependent Claim
16 words
Process according to claim 6, said amount being about 10-30%, and n being 0 to 1/2.
Claim 9
Dependent Claim
47 words
Process according to claim 6, wherein at least one other inorganic calcium salt, in pulverized form, is included in said mixture, in such quantities that the content thereof amounts to about 0.1 to 5% by weight, with reference to water-free calcium sulfate, of the added calcium sulfate.
Claim 10
Dependent Claim
36 words
Process according to claim 6, wherein at least one air containing or porous inorganic or organic substance in pulverized form is included in the mixture in amount of up to 20% by weight of the mixture.
Claim 11
Dependent Claim
18 words
Process according to claim 6, characterized in that modified resols are used as the foamable phenolic resol resins.
Claim 12
Dependent Claim
19 words
A phenolic resin foam according to claim 1 containing 10-50% by weight of said CaSO 4 .nH 2 O.
Claim 13
Dependent Claim
26 words
A process according to claim 6 wherein said CaSO 4 .nH 2 O is included in the mixture in an amount of 10-50 percent by weight.
Claim 14
Dependent Claim
26 words
A process according to claim 12 wherein said CaSO 4 .nH 2 O is included in said mixture in an amount of 10-30 percent by weight.
Claim 15
Dependent Claim
26 words
A phenolic resin according to claim 1 wherein said CaSO 4 .nH 2 O is present in an amount of at least 15 percent by weight.
Claim 16
Dependent Claim
28 words
A phenolic resin according to claim 14 wherein said CaSO 4 .nH 2 O compound is present in an amount of from 15 to 30 percent by weight.
Claim 17
Dependent Claim
26 words
A process according to claim 6 wherein said CaSO 4 .nH 2 O compound is present in an amount of at least 15 percent by weight.
Claim 18
Dependent Claim
12 words
A process according to claim 6 wherein said blowing agent is n-pentane.
Claim 19
Dependent Claim
13 words
A process according to claim 6 wherein said blowing agent is petroleum ether.
Claim 20
Dependent Claim
13 words
A process according to claim 6 wherein said hardener is a solid hardener.
Claim 21
Dependent Claim
22 words
A process according to claim 19 wherein said solid hardener comprises a mixture of powdered p-toluene sulfonic acid and powdered boric 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) | 1982-08-27 | 1983-02-26 | 1983-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-27 | 1987-02-26 | 1987-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-27 | 1991-02-26 | 1991-08-28 | $7700.00 | Window Closed / Lapsed |