US4239869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenolic resins with improved low temperature processing stability
Assignee: Occidental Chemical Corp
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Filing: 1979-04-13
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Granted: 1980-12-16
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Expires: 1999-04-13
Abstract
Abstract Phenolic novolak resins are described which provide extended resin stability at relatively low temperatures without significant adverse affect on the cure speed at the molding temperature. The resins are especially suited for use in runnerless injection or cold manifold molding processes, but can also be used in transfer, compression and injection molding processes.
Inventors
- 👤 Myron C. Annis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:31
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/04; C08G61/00; C08G61/02; C08G61/04; C08G61/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
63 words
A phenolic novolac molding composition having improved low temperature processing stability comprising a phenol-aldehyde resin containing about 0.63 to 0.68 mole aldehyde per mole of phenol, and having a heterogeneity index in the range of about 1.5 to 2, a melt viscosity in the range of 500 to 1200 centipoises at 135° C., and a brittle point of 63° to 70° C. clear.
Claim 2
Dependent Claim
63 words
A phenolic novolac molding composition having improved low temperature processing stability comprising a phenol-aldehyde resin containing about 0.63 to 0.68 mole aldehyde per mole of phenol, and having a heterogeneity index in the range of about 1.5 to 2, a melt viscosity in the range of 500 to 1200 centipoises at 135° C., and a brittle point of 63° to 70° C. clear.
Claim 3
Dependent Claim
11 words
The molding composition of claim 1 wherein the aldehyde is formaldehyde.
Claim 4
Dependent Claim
12 words
The composition of claim 2 which includes hexamethylenetetramine and a filler material.
Claim 5
Dependent Claim
11 words
A molding article formed by curing the composition of claim 3.
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) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |