Patent US4345003A successfully refreshed from Google Patents.
US4345003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resol phenolic resin binder for hot coating of foundry sand
Assignee: Sumitomo Durez Co Ltd
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Filing: 1980-12-04
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Granted: 1982-08-17
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Expires: 2000-12-04
Abstract
Abstract A phenolic resin binder useful for hot coating foundry sand and comprising a mixture of a solid resol phenolic resin and a lubricant is provided in the form of beads or rods of diameter of about 0.5 to 7 mm and a length of about 0.5 to 30 mm. The beads or rods can be formed directly from a molten mixture of the components or the molten mixture can first be solidified and thereafter formed into such beads or rods. The process for the hot coating of foundry sand with the phenolic resin binder and the resulting foundry compositions, molds and cores are also disclosed.
Inventors
- 👤 Noriaki Matsushima
- 👤 Shigeru Nemoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:00
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0008; B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2246; B22C1/2253; C08L; C08L61/00; C08L61/04; C08L61/06; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/254; Y10T428/29; Y10T428/2913; Y10T428/2927; Y10T428/2973; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
75 words
A phenolic resin binder in the form of discrete, molded particles useful for hot coating foundry sand, said molded particles comprised of a mixture of solid resol phenolic resin and a lubricant substantially homogeneously dispersed therein, said discrete, molded particles being in the form of beads having a diameter of about 1 to 5 mm or rods having a diameter of about 1 to 5 mm and a length of about 1 to 15 mm.
Claim 2
Dependent Claim
75 words
A phenolic resin binder in the form of discrete, molded particles useful for hot coating foundry sand, said molded particles comprised of a mixture of solid resol phenolic resin and a lubricant substantially homogeneously dispersed therein, said discrete, molded particles being in the form of beads having a diameter of about 1 to 5 mm or rods having a diameter of about 1 to 5 mm and a length of about 1 to 15 mm.
Claim 3
Dependent Claim
20 words
A binder according to claim 1 wherein said mixture in molten form is formed directly into said beads or rods.
Claim 4
Dependent Claim
22 words
A binder according to claim 1 wherein said mixture in molten form is solidified and thereafter formed into said beads or rods.
Claim 5
Dependent Claim
28 words
A binder according to claim 1 which contains said lubricant in an amount of about 0.5 to 10% by weight with respect to said solid resol phenolic resin.
Claim 6
Dependent Claim
18 words
A binder according to claims 1 or 4 wherein the solid resol phenolic resin comprises a hardening accelerator.
Claim 7
Dependent Claim
28 words
A binder according to claim 4 which contains a lubricant in an amount of about 1 to 7% by weight with respect to said solid resol phenolic resin.
Claim 8
Dependent Claim
12 words
A binder according to claim 4 further comprising a silane coupling agent.
Claim 9
Dependent Claim
12 words
A binder according to claim 6 wherein said lubricant is polyethylene wax.
Claim 10
Dependent Claim
14 words
A binder according to claim 6 wherein said lubricant is a fatty acid amide.
Claim 11
Dependent Claim
27 words
A binder according to claim 9 wherein said lubricant is selected from the group consisting of ethylene bisstearyl amide, methylene bisstearyl amide, oxystearyl amide and stearyl amide.
Claim 12
Dependent Claim
18 words
A process for producing resin-coated sand which comprises coating heated sand particles with the binder of claim 1.
Claim 13
Dependent Claim
19 words
A foundry sand composition useful as a foundry sand core or mold prepared by the process of claim 11.
Claim 14
Dependent Claim
31 words
A process for producing resin-coated sand according to claim 11 wherein said binder is employed in a proportion of about 1 to about 5 percent by weight of said foundry sand.
Claim 15
Dependent Claim
19 words
A foundry sand composition useful as a foundry sand core or mold prepared by the process of claim 13.
Claim 16
Dependent Claim
30 words
The process of claim 13 wherein said binder contains said lubricant in an amount of about 0.5 to 10 percent by weight with respect to said solid resol phenolic resin.
Claim 17
Dependent Claim
19 words
A foundry sand composition useful as a foundry sand core or mold prepared by the process of claim 15.
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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) | 1985-08-16 | 1986-02-15 | 1986-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-16 | 1990-02-15 | 1990-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-16 | 1994-02-15 | 1994-08-17 | $7700.00 | Window Closed / Lapsed |