US4150194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low emission phenolic resin compositions
Assignee: Ashland Inc
•
Filing: 1978-07-17
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Granted: 1979-04-17
•
Expires: 1998-07-17
Abstract
Abstract Phenol is condensed with a substantial excess of formaldehyde in the presence of a minor amount of a glycol or a polyalkylene glycol to provide a resole useful as an impregnating resinous binder for paper substrates.
Inventors
- 👤 Fred G. Watts
- 👤 James T. Henderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:36
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/28; C08G8/36; C08G16/00; C08G16/02; C08L; C08L61/00; C08L61/04; C08L61/06; C08L61/14; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/47; D21H17/48; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31964; Y10T428/31967
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
A thermosetting phenolic resin impregnated paper substrate wherein said phenolic resin is prepared by reacting aqueous formaldehyde or the methyl hemiacetal form thereof and a phenol in a molar ratio of from about (1.25-1.75):1.0, respectively, in the presence of a diol in the amount of from 10-40 wt. % based on said phenol and from about 0.5-1.5 wt. % based on said phenol of an alkali metal hydroxide, until the resultant condensate exhibits a cure time of from 5-40 seconds in accordance with the Stroke cure test, and thereupon dehydrating the reaction mixture to the extent whereby the water content is less than about 5 wt. %.
Claim 2
Dependent Claim
107 words
A thermosetting phenolic resin impregnated paper substrate wherein said phenolic resin is prepared by reacting aqueous formaldehyde or the methyl hemiacetal form thereof and a phenol in a molar ratio of from about (1.25-1.75):1.0, respectively, in the presence of a diol in the amount of from 10-40 wt. % based on said phenol and from about 0.5-1.5 wt. % based on said phenol of an alkali metal hydroxide, until the resultant condensate exhibits a cure time of from 5-40 seconds in accordance with the Stroke cure test, and thereupon dehydrating the reaction mixture to the extent whereby the water content is less than about 5 wt. %.
Claim 3
Dependent Claim
24 words
An impregnated paper substrate in accordance with claim 1 wherein the formaldehyde is reacted with phenol in a molar ratio of from (1.4-1.6):1.0, respectively.
Claim 4
Dependent Claim
24 words
An impregnated paper substrate in accordance with claim 2 wherein said diol is diethylene glycol, dipropylene glycol, triethylene glycol, tripropylene glycol or mixtures thereof.
Claim 5
Dependent Claim
21 words
An impregnated paper substrate in accordance with claim 3 wherein the molar ratio of formaldehyde to phenol is about 1.5:1, respectively.
Claim 6
Dependent Claim
26 words
An impregnated paper substrate in accordance with claim 4 wherein said glycol is present in the amount of from 20-25 wt. % based on the phenol.
Claim 7
Dependent Claim
15 words
An impregnated paper substrate in accordance with claim 5 wherein said glycol is diethylene glycol.
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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) | 1982-04-16 | 1982-10-16 | 1983-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-16 | 1986-10-16 | 1987-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-16 | 1990-10-16 | 1991-04-17 | $7700.00 | Window Closed / Lapsed |