US4017437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emulsified phenol-formaldehyde resins
Assignee: Cor Tech Research Ltd
•
Filing: 1975-04-14
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Granted: 1977-04-12
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Expires: 1995-04-14
Abstract
Abstract A rapidly curable phenol-formaldehyde resin is provided in the form of an emulsion which has particular utility in panel board production, particularly waferboard production.
Inventors
- 👤 Ramesh C. Vasishth
- 👤 Pitchaiya Chandramouli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:44
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/11; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/10; C08J2361/00; C08J2361/04; C08J2361/06; C08J2361/08; C08J2361/10; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/253; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31957; Y10T428/3196
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
77 words
A stable resin-in-water emulsion of a room temperature-stable and mobile thermosetting phenol-formaldehyde resin capable of rapid cure at elevated temperature, formed by reaction of formaldehyde with phenol at a mole ratio of formaldehyde to phenol greater than about 1.7:1 in an aqueous reaction medium in the presence of a metal carboxylate catalyst therefor and acid addition to the resin so formed prior to emulsification, and having a viscosity of about 1,000 to 40,000cps at about 24° C.
Claim 2
Dependent Claim
77 words
A stable resin-in-water emulsion of a room temperature-stable and mobile thermosetting phenol-formaldehyde resin capable of rapid cure at elevated temperature, formed by reaction of formaldehyde with phenol at a mole ratio of formaldehyde to phenol greater than about 1.7:1 in an aqueous reaction medium in the presence of a metal carboxylate catalyst therefor and acid addition to the resin so formed prior to emulsification, and having a viscosity of about 1,000 to 40,000cps at about 24° C.
Claim 3
Dependent Claim
24 words
The emulsion of claim 1 wherein said reaction of formaldehyde and phenol takes place substantially wholly at a temperature of above about 90° C.
Claim 4
Dependent Claim
25 words
The emulsion of claim 1 wherein from about 0.5 to about 5% of para-toluene sulfonic acid is added to the resin resulting from the reaction.
Claim 5
Dependent Claim
22 words
The emulsion of claim 1 wherein a catalysing amount of para-toluene sulfonic acid is added to the resin resulting from the reaction.
References Cited (Backward Citations)
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US2069178A
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US2410395A
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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) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |