US4426484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for accelerating cure of resole type phenolic resins
Assignee: Sumitomo Durez Co Ltd
•
Filing: 1981-10-14
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Granted: 1984-01-17
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Expires: 2001-10-14
Abstract
Abstract The cure of resin compositions comprising a mixture of a resole type phenol aldehyde resin and a novolac type phenol formaldehyde resin is improved by employing resorcinol as all or part of the phenolic component in the novolac type resin. The resin compositions are particularly useful as binders for foundry sand.
Inventors
- 👤 Yukio Saeki
- 👤 Katsuyuki Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:44
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2246; B22C1/2253; C; C08; C08L; C08L61/00; C08L61/04; C08L61/06; C08L61/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
59 words
A resin composition comprising a phenol-aldehyde resole resin that is solid at ambient temperature, and about 0.3 to 20 parts by weight of a phenol-aldehyde novolac resin that is solid at ambient temperature based upon 100 parts by weight of said resole resin, wherein about 50 to 100 percent of the phenolic component of said novolac resin is resorcinol.
Claim 2
Dependent Claim
59 words
A resin composition comprising a phenol-aldehyde resole resin that is solid at ambient temperature, and about 0.3 to 20 parts by weight of a phenol-aldehyde novolac resin that is solid at ambient temperature based upon 100 parts by weight of said resole resin, wherein about 50 to 100 percent of the phenolic component of said novolac resin is resorcinol.
Claim 3
Dependent Claim
20 words
The composition of claim 1 wherein the aldehyde component of both the resole resin and the novolac resin is formaldehyde.
Claim 4
Dependent Claim
33 words
The composition of claim 2 wherein all of the phenolic component of said novolac resin is resorcinol, and the ratio of 0.5 to 1 mole of formaldehyde is employed per mole of resorcinol.
Claim 5
Dependent Claim
31 words
A foundry composition comprising a foundry aggregate and about 1 to about 5 parts by weight of the resin composition of claim 1, based on 100 parts by weight of aggregate.
Claim 6
Dependent Claim
13 words
The composition of claim 4 wherein the foundry composition comprises resin coated sand.
Claim 7
Dependent Claim
19 words
The process for preparing a foundry sand mold by heating at elevated temperatures the foundry composition of claim 1.
Claim 8
Dependent Claim
19 words
The process for preparing a foundry sand mold by heating at elevated temperatures the foundry composition of claim 5.
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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) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |