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US4206262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catechol resins for the shell process
Assignee: Hexion Inc
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Filing: 1978-01-16
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Granted: 1980-06-03
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Expires: 1998-01-16
Abstract
Abstract A resin-coated sand comprising: (a) particles of sand coated with from about 1% to about 8%, by weight of the sand, of a novolak resin consisting essentially of about 50% to about 98% of a phenol-formaldehyde novolak resin and about 2% to about 50% of a catechol-formaldehyde novolak resin; and, (b) a curing agent. The sands are especially useful for forming foundry cores and molds.
Inventors
- 👤 Robert S. Craig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:42
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/20; B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2246; C04; C04B; C04B20/00; C04B20/10; C04B20/1018; C04B20/1029; C04B20/1037; C04B26/00; C04B26/02; C04B26/10; C04B26/12; C08L; C08L61/00; C08L61/04; C08L61/06; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2998
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
75 words
A resin-coated sand comprising particles of sand coated with a composition consisting essentially of: (a) from about 1% to about 8%, by weight of the sand, of a novolak resin consisting essentially of from about 50% to about 98%, by weight of the total novolak resin, of a phenol-formaldehyde novolak resin and from about 2% to about 50%, by weight of the total novolak resin, of a catechol-formaldehyde novolak resin; and (b) a curing agent.
Claim 2
Dependent Claim
75 words
A resin-coated sand comprising particles of sand coated with a composition consisting essentially of: (a) from about 1% to about 8%, by weight of the sand, of a novolak resin consisting essentially of from about 50% to about 98%, by weight of the total novolak resin, of a phenol-formaldehyde novolak resin and from about 2% to about 50%, by weight of the total novolak resin, of a catechol-formaldehyde novolak resin; and (b) a curing agent.
Claim 3
Dependent Claim
12 words
The resin-coated sand of claim 1, wherein the curing agent is hexamethylenetetramine.
Claim 4
Dependent Claim
26 words
The resin-coated sand of claim 1, wherein the particles of sand, are coated with from 1% to 6%, by weight of the sand, of novolak resin.
Claim 5
Dependent Claim
24 words
The resin coated sand of claim 1 further including from about 2% to about 8%, by weight of novolak resin, of a release agent.
Claim 6
Dependent Claim
50 words
The resin-coated sand of claim 1 wherein the novolak resin consists essentially of from about 60% to about 85%, by weight of the total novolak resin, of a phenol-formaldehyde novolak resin and from about 15% to about 40%, by weight of the total novolak resin, of a catechol-formaldehyde novolak resin.
Claim 7
Dependent Claim
23 words
The resin-coated sand of claim 2 wherein the amount of hexamethylenetetramine is from about 8% to about 20% by weight of the resin.
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) | 1983-06-03 | 1983-12-03 | 1984-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-03 | 1987-12-03 | 1988-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-03 | 1991-12-03 | 1992-06-03 | $7700.00 | Window Closed / Lapsed |