US4460717A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resin coated sand composition and method of producing same
Assignee: Sumitomo Durez Co Ltd
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Filing: 1983-06-16
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Granted: 1984-07-17
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Expires: 2003-06-16
Abstract
Abstract A resin coated sand for shell-molding foundry operations having improved shake-out properties for molds prepared therefrom is disclosed. Also disclosed are methods of producing said sand. The foundry aggregates or sand are coated with a phenolic resin containing from 0.2 to 40 parts of an aromatic nitro compound per 100 parts of phenolic resin. The resin may be a novolac type, a resole type or a mixture of the two types of phenolic resins. Suggested aromatic nitro compounds are nitrophenols, dinitrophenols and nitronaphthalenes. The process is extremely useful for coating lower melting temperature metals such as aluminum and magnesium.
Inventors
- 👤 Yukio Saeki
- 👤 Shigeru Nemoto
- 👤 Yukio Tokunaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:01
CPC Classifications
C; C08; C08G; C08G16/00; C08G16/02; C08G16/0212; C08G16/0218; C08G16/0231; B; B22; B22C; B22C1/00; B22C1/02; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2246; B22C1/2253; C08G8/00; C08G8/04; C08G8/08; C08G8/16; C08G8/24; C08K; C08K5/00; C08K5/16; C08K5/32
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
53 words
A resin coated sand for shell-molding foundry operations providing improved shake-out properties of molds prepared therefrom, comprising foundry aggregates coated with a phenolic resin containing an aromatic nitro compound, wherein the incorporating range of aromatic nitro compounds to 100 parts by weight phenolic is from about 0.2 to about 40 parts by weight.
Claim 2
Dependent Claim
53 words
A resin coated sand for shell-molding foundry operations providing improved shake-out properties of molds prepared therefrom, comprising foundry aggregates coated with a phenolic resin containing an aromatic nitro compound, wherein the incorporating range of aromatic nitro compounds to 100 parts by weight phenolic is from about 0.2 to about 40 parts by weight.
Claim 3
Dependent Claim
24 words
A resin coated sand according to claim 1, wherein the aromatic nitro compound is selected from, o-nitrophenol, p-nitrophenol, m-nitrophenol, 2,4-dinitrophenol, 2,5-dinitrophenol, 2,6-dinitrophenol and dinitronaphthalene.
Claim 4
Dependent Claim
17 words
A resin coated sand according to claim 1, wherein the phenolic resin is a novolac phenolic resin.
Claim 5
Dependent Claim
17 words
A resin coated sand according to claim 1, wherein the phenolic resin is a resole phenolic resin.
Claim 6
Dependent Claim
21 words
A resin coated sand according to claim 1, wherein the phenolic resin is a mixture of novolac and resole phenolic resins.
Claim 7
Dependent Claim
16 words
A resin coated sand according to claim 3, wherein the phenolic resin additional contains a lubricant.
Claim 8
Dependent Claim
16 words
A resin coated sand according to claim 4, wherein the phenolic resin additional contains a lubricant.
Claim 9
Dependent Claim
16 words
A resin coated sand according to claim 5, wherein the phenolic resin additionally contains a lubricant.
Claim 10
Independent Claim
56 words
A method for producing resin coated sand for shell-molding foundry operations having improved shake-out properties of molds prepared therefrom comprising coating foundry aggregates with phenolic resin containing an aromatic nitro compound, wherein the incorporating ratio of aromatic nitro compound to 100 parts by weight phenolic resin is from about 0.2 to about 40 parts by weight.
Claim 11
Independent Claim
56 words
A method for producing resin coated sand for shell-molding foundry operations having improved shake-out properties of molds prepared therefrom comprising coating foundry aggregates with phenolic resin containing an aromatic nitro compound, wherein the incorporating ratio of aromatic nitro compound to 100 parts by weight phenolic resin is from about 0.2 to about 40 parts by weight.
Claim 12
Dependent Claim
27 words
A method for producing resin coated sand according to claim 9, wherein the aromatic nitro compound is selected from o-nitrophenol, p-nitrophenol, m-nitrophenol, 2,4-dinitrophenol, 2,5-dinitrophenol, 2,6-dinitrophenol or dinitronaphthalene.
Claim 13
Dependent Claim
20 words
A method for producing resin coated sand according to claim 9, wherein the phenolic resin is a novolac phenolic resin.
Claim 14
Dependent Claim
20 words
A method for producing resin coated sand according to claim 9, wherein the phenolic resin is a resole phenolic resin.
Claim 15
Dependent Claim
24 words
A method for producing resin coated sand according to claim 9, wherein the phenolic resin is a mixture of novolac and resole phenolic resin.
Claim 16
Dependent Claim
44 words
A resin coated sand for shell-molding foundry operations providing improved shake-out properties of molds prepared therefrom comprising foundry aggregates coated with a phenolic resin containing a lubricant and from 0.2 to 40 parts of an aromatic nitro compound per 100 parts of phenolic resin.
Claim 17
Dependent Claim
44 words
A resin coated sand for shell-molding foundry operations providing improved shake-out properties of molds prepared therefrom comprising foundry aggregates coated with a phenolic resin containing a lubricant and from 0.2 to 40 parts of an aromatic nitro compound per 100 parts of phenolic resin.
Claim 18
Independent Claim
47 words
A method for producing resin coated sand for shell-molding foundry operations having improved shake-out properties of molds prepared therefrom, comprising coating foundry aggregates with a phenolic resin containing a lubricant and from 0.2 to 40 parts of an aromatic nitro compound per 100 parts of phenolic resin.
Claim 19
Independent Claim
47 words
A method for producing resin coated sand for shell-molding foundry operations having improved shake-out properties of molds prepared therefrom, comprising coating foundry aggregates with a phenolic resin containing a lubricant and from 0.2 to 40 parts of an aromatic nitro compound per 100 parts of phenolic resin.
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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) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |