Patent US3835208A successfully refreshed from Google Patents.
US3835208A
Expired / Lapsed
US
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Method for producing an integral skin phenolic foam
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1972-06-09
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Granted: 1974-09-10
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Expires: 1992-06-09
Abstract
Abstract A phenolic foam element having an integral skin of hard, unfoamed thermoset resin is prepared by foaming and curing a phenol aldehyde resin between mold confining members coated with a surface active agent in an amount sufficient that the resin in contact with the mold during foaming collapses, thereby forming the skin. This integral skin protects the foam against abrasion and indentation and eliminates the need for protective coatings, of paper, and the like, on the foam.
Inventors
- 👤 S Koutitonsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:58
CPC Classifications
B; B29; B29C; B29C44/00; C; C08; C08J; C08J9/00; C08J9/34; C08J2361/00; C08J2361/04; C08J2361/06; C08J2361/08; Y; Y10; Y10S; Y10S264/00; Y10S264/02; Y10S264/05; Y10S264/14; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249988; Y10T428/249989
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
13 words
The method of claim 1 wherein the surface active agent is silicone oil.
Claim 2
Dependent Claim
14 words
The method of claim 1 wherein the surface active agent is a chloRinated wax.
Claim 3
Dependent Claim
32 words
The method of claim 1 wherein the surface active agent is present in an amount from 2 to 4 grams per square foot of mold surface area in contact with the foam.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein the phenol aldehyde resin is a phenol formaldehyde resin.
Claim 5
Dependent Claim
30 words
The method of claim 1 wherein the mold confining members are maintained at temperatures in the range of about 60*C. to about 100*C. during foaming and curing of the resin.
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |