US3661814A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenol-formaldehyde adhesive resins by addition of polyhydric alcohols
Assignee: Dow Chemical Co
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Filing: 1970-12-21
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Granted: 1972-05-09
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Expires: 1990-12-21
Abstract
Abstract IMPROVED PHENOL-FORMALDEHYDE ADHESIVE RESINS ARE OBTAINED BY PREMIXING WITH AQUEOUS FORMALDEHYDE ABOUT 0.5-10 WEIGHT PERCENT BASED ON FORMALDEHYDE OF A POLYHYDRIC ALCOHOL OF FORMULA I: R ((OCMH2M)AOH)B WHERE R IS A C4-C12 ALIPHATIC GROUP, M IS 2-4, A IS 0-3 AND B IS 4-8, AND THEREAFTER REACTING THE FORMALDEHYDEPOLYHYDRIC ALCOHOL SOLUTION WITH PHENOL IN THE PRESENCE OF ALKALI. PREFERRED ARE WATER-SOLUBLE SUGARS AND RELATED POLYOLS INCLUDING THEIR C2-C4 ALKYLENE OXIDE DERIVATIVES. THE RESULTING THERMOSETTING RESOLE ADHESIVE RESINS ARE PARTICULARLY SUITABLE FOR PLYWOOD GLUES.
Inventors
- 👤 Harry A Smith
- 👤 Erwin H Kobel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:06
CPC Classifications
C; C09; C09J; C09J161/00; C09J161/04; C09J161/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |