US4080213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sand mold composition for metal casting
Assignee: Hayashibara Seibutsu Kagaku Kenkyujo KK
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Filing: 1976-04-06
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Granted: 1978-03-21
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Expires: 1996-04-06
Abstract
Abstract A sand mold composition for the metal casting comprising a molding sand and pullulan as a binder therefor. As compared with prior art, the present composition has following advantages: in the molding step, no gas, dust, noise, or vibration is generated; in the pouring and sand stripping steps, neither noxious gas nor offensive odor is emitted; although the mold has a sufficiently high strength at room temperature for the convenient handling, it is readily broken down after the casting and so renders the knock-out and sand stripping very easy; and the recovered sand can be reused as such, practically without any after-treatment. The molding cycle is comparable to that of conventional oil sand or carbon dioxide-bonded mold.
Inventors
- 👤 Atsuo Mori
- 👤 Kozo Tsuji
- 👤 Kiyohiko Nakae
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:41
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2293
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
51 words
A sand mold composition for the metal casting comprising a molding sand and pullulan having a molecular weight of 5000 to 2,000,000 as a binder therefor, said pullulan being present in a quantity of 0.1 to 15 parts by weight of pullulan for every 100 parts by weight of molding sand.
Claim 2
Dependent Claim
51 words
A sand mold composition for the metal casting comprising a molding sand and pullulan having a molecular weight of 5000 to 2,000,000 as a binder therefor, said pullulan being present in a quantity of 0.1 to 15 parts by weight of pullulan for every 100 parts by weight of molding sand.
Claim 3
Dependent Claim
13 words
A composition according to claim 1, wherein the molding sand is silica sand.
Claim 4
Dependent Claim
22 words
A composition according to claim 1, wherein moisture content of the composition is 0.5 to 15% by weight based on dry composition.
Claim 5
Dependent Claim
13 words
A composition according to claim 1, wherein clay is incorporated in the composition.
Claim 6
Dependent Claim
11 words
A composition according to claim 4, wherein the clay is bentonite.
Claim 7
Dependent Claim
34 words
A composition according to claim 1, wherein at least one of the ethylene glycol, propylene glycol, glycerol, starch, sodium alginate, carboxymethylcellulose, methylcellulose, hydroxyethylcellulose, acacia, and derivatives thereof is added as a plasticizer for pullulan.
Claim 8
Dependent Claim
23 words
A composition according to claim 1, wherein an etherified, esterififed, oxidized, or aminated pullulan is used jointly with or in place of pullulan.
Claim 9
Dependent Claim
18 words
A composition according to claim 1, wherein kerosene, gas oil, or silicon oil is added to the composition.
Claim 10
Dependent Claim
51 words
A sand mold for the metal casting preapred from a molding sand and pullulan having a molecular weight of 5,000 to 2,000,000 as a binder therefor, said pullulan being present in a quantity of 0.1 to 15 parts by weight of pullulan for every 100 parts by weight of molding sand.
Claim 11
Dependent Claim
51 words
A sand mold for the metal casting preapred from a molding sand and pullulan having a molecular weight of 5,000 to 2,000,000 as a binder therefor, said pullulan being present in a quantity of 0.1 to 15 parts by weight of pullulan for every 100 parts by weight of molding sand.
References Cited (Backward Citations)
US2977236A
Cited
US3179523A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-20 | 1981-09-19 | 1982-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-20 | 1985-09-19 | 1986-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-20 | 1989-09-19 | 1990-03-21 | $7700.00 | Window Closed / Lapsed |