US3725349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenol-formaldehyde adhesive resins containing poly(c{11 {14 c{11 alkyleneoxy)glycols
Assignee: Dow Chemical Co
•
Filing: 1972-06-12
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Granted: 1973-04-03
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Expires: 1992-06-12
Abstract
Abstract Improved phenol-formaldehyde adhesive resins are obtained by premixing with aqueous formaldehyde about 0.3-1.5 parts per part formaldehyde of a poly(C3-C4 alkyleneoxy)glycol of Formula I:
Inventors
- 👤 H Smith
- 👤 E Kobel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:02
CPC Classifications
C; C09; C09J; C09J161/00; C09J161/04; C09J161/06; C09J161/14; B; B27; B27D; B27D1/00; B27D1/04; C08; C08G; C08G8/00; C08G8/38; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31957; Y10T428/3196
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
11 words
The process of claim 1 where the polyglycol is a polypropyleneoxyglycol.
Claim 2
Dependent Claim
19 words
The process of claim 1 where the polyglycol is a polypropyleneoxyglycol with an average molecular weight of about 1,200-4,000.
Claim 3
Dependent Claim
31 words
The process of claim 1 where the formaldehyde-polyglycol solution is reacted with phenol and alkali in a ratio of about 1.5-2.5 moles formaldehyde and about 0.1-0.7 mole alkali per mole phenol.
Claim 4
Dependent Claim
33 words
The process of claim 4 where the formaldehyde-polyglycol solution is reacted with phenol in the presence of sodium hydroxide at about 70*-100*C in a ratio of about 1.7-2.0 moles formaldehyde per mole phenol.
Claim 5
Dependent Claim
13 words
A thermosetting phenol-formaldehyde adhesive resole resin prepared by the process of claim 1.
Claim 6
Dependent Claim
25 words
An adhesive glue suitable for plywood manufacture containing as the adhesive resin a thermosetting phenol-formaldehyde adhesive resole resin prepared by the process of claim 1.
References Cited (Backward Citations)
US1952243A
Cited
US2902470A
Cited
US3025255A
Cited
US3156670A
Cited
US3663481A
Cited
US3661814A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |