Patent US4607067A successfully refreshed from Google Patents.
US4607067A
Expired / Lapsed
US
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Foundry sand binder
Assignee: Nissan Motor Co Ltd
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Filing: 1985-04-19
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Granted: 1986-08-19
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Expires: 2005-04-19
Abstract
Abstract A binder is used for binding foundry sand to form a mold and a core for casting, and consists of a condensation-reactive first compound (resin) having at least one methylol group in a molecule, amounting to 100 parts by weight. An additive component is added to the resin to improve the strength and the sand removability of the mold and the core while improving the production yield of the mold and the core. The additive component includes at least one of calcium hydroxide and barium hydroxide in particle form. The particle surface of the at least one of calcium hydroxide and barium hydroxide is coated with a second compound having a melting point not lower than 50° C. and a boiling point ranging from 250° to 400° C., the second compound ranging from 0.5 to 35 parts by weight.
Inventors
- 👤 Keiji Ohashi
- 👤 Kohichi Handa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:45
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/167; B22C1/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
96 words
A binder composition for foundry sand, comprising: a condensation-reactive first compound having at least one methylol group in a molecule and amounting to 100 parts by weight; and a component including at least one of calcium hydroxide and barium hydroxide in particle form, and a second compound having a melting point not lower than 50° C. and a boiling point ranging from 250° to 400° C., said second compound being coated on a particle surface of said at least one of calcium hydroxide and barium hydroxide, said component ranging from 0.5 to 35 parts by weight.
Claim 2
Dependent Claim
96 words
A binder composition for foundry sand, comprising: a condensation-reactive first compound having at least one methylol group in a molecule and amounting to 100 parts by weight; and a component including at least one of calcium hydroxide and barium hydroxide in particle form, and a second compound having a melting point not lower than 50° C. and a boiling point ranging from 250° to 400° C., said second compound being coated on a particle surface of said at least one of calcium hydroxide and barium hydroxide, said component ranging from 0.5 to 35 parts by weight.
Claim 3
Dependent Claim
38 words
A binder composition as claimed in claim 1, wherein said second compound amounts to not less than 5 parts by weight relative to 100 parts by weight of said at least one of calcium hydroxide and barium hydroxide.
Claim 4
Dependent Claim
38 words
A binder composition as claimed in claim 2, wherein said second compound amounts to not more than 50 parts by weight relative to 100 parts by weight of said at least one of calcium hydroxide and barium hydroxide.
Claim 5
Dependent Claim
39 words
A binder composition as claimed in claim 1, wherein said second compound is at least one selected from the group consisting of diphenyl, catechol, p-octylphenol, 3,5-xylenol, bisphenol A, phenylacetic acid, trimethylolpropane, pentachlorophenol, caprylamide, sorbic acid, tribromoacetic acid, and n-bis(chloromethyl)benzene.
Claim 6
Dependent Claim
56 words
A binder composition as claimed in claim 1, wherein said condensation-reactive first compound is at least one selected from the group consisting of phenol-formaldehyde resin, furfuryl alcohol-furfural copolycondensation resin, furfuryl alcohol resin, furfural-phenol copolycondensation resin, furfural-ketone copolycondensation resin, furfuryl alcohol-formaldehyde resin, furfuryl-alcohol-urea-formaldehyde resin, furfuryl alcohol-phenol-urea-formaldehyde resin, furfuryl alcohol-phenol-formaldehyde resin, melamine-formaldehyde resin, urea-formaldehyde resin, and resorcinol-formaldehyde resin.
Claim 7
Dependent Claim
122 words
A molding composition for forming a mold and a core for casting, said molding composition comprising foundry sand, a binder for binding said foundry sand, said binder including a condensation-reactive first compound having at least one methylol group in a molecule, and a component including at least one of calcium hydroxide and barium hydroxide in particle form, and a second compound having a melting point not lower than 50° C. and a boiling point ranging from 250° to 400° C., said second compound being coated on a particle surface of said at least one of calcium hydroxide and barium hydroxide, said second compound amounting to 0.5 to 35 parts by weight relative to 100 parts by weight of said condensation-reactive first compound.
Claim 8
Dependent Claim
122 words
A molding composition for forming a mold and a core for casting, said molding composition comprising foundry sand, a binder for binding said foundry sand, said binder including a condensation-reactive first compound having at least one methylol group in a molecule, and a component including at least one of calcium hydroxide and barium hydroxide in particle form, and a second compound having a melting point not lower than 50° C. and a boiling point ranging from 250° to 400° C., said second compound being coated on a particle surface of said at least one of calcium hydroxide and barium hydroxide, said second compound amounting to 0.5 to 35 parts by weight relative to 100 parts by weight of said condensation-reactive first compound.
Claim 9
Independent Claim
106 words
A method for preparing a binder for foundry sand, said binder including as a major part a condensation-reactive first compound having a methylol group in a molecule, said method comprising: coating a surface of at least one of calcium hydroxide and barium hydroxide in particle form with a second compound having a melting point not lower than 50° C. and a boiling point ranging from 250° to 400° C. to form an additive component; and mixing said additive component with said condensation-reactive first compound, said additive component ranging from 0.5 to 35 parts by weight relative to 100 parts by weight of said condensation-reactive first compound.
Claim 10
Independent Claim
106 words
A method for preparing a binder for foundry sand, said binder including as a major part a condensation-reactive first compound having a methylol group in a molecule, said method comprising: coating a surface of at least one of calcium hydroxide and barium hydroxide in particle form with a second compound having a melting point not lower than 50° C. and a boiling point ranging from 250° to 400° C. to form an additive component; and mixing said additive component with said condensation-reactive first compound, said additive component ranging from 0.5 to 35 parts by weight relative to 100 parts by weight of said condensation-reactive first compound.
Claim 11
Dependent Claim
37 words
A method as claimed in claim 7, wherein said second compound amounts to not less than 5 parts by weight relative to 100 parts by weight of said at least one of calcium hydroxide and barium hydroxide.
Claim 12
Dependent Claim
37 words
A method as claimed in claim 8, wherein said second compound amounts to not more than 50 parts by weight relative to 100 parts by weight of said at least one of calcium hydroxide and barium hydroxide.
Claim 13
Dependent Claim
38 words
A method as claimed in claim 7, wherein said second compound is at least one selected from the group consisting of diphenyl, catechol, p-octylphenol, 3,5-xylenol, bisphenol A, phenylacetic acid, trimethylolpropane, pentachlorophenol, caprylamide, sorbic acid, tribromoacetic acid, and n-bis(chloromethyl)benzene.
Claim 14
Dependent Claim
57 words
A method as claimed in claim 7, wherein said condensation-reactive first compound is at least one selected from the group consisting of phenol-formaldehyde resin, furfuryl alcohol-furfural copolycondensation resin, furfuryl alcohol resin, furfural-phenol alcohol copolycondensation resin, furfural-ketone copolycondensation resin, furfuryl alcohol-formaldehyde resin, furfuryl alcohol-urea-formaldehyde resin, furfuryl alcohol-phenol-urea-formaldehyde resin, furfuryl alcohol-phenol-formaldehyde resin, melamine-formaldehyde resin, urea-formaldehyde resin, and resorcinol-formaldehyde 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) | 1989-08-18 | 1990-02-17 | 1990-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-18 | 1994-02-17 | 1994-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-18 | 1998-02-17 | 1998-08-19 | $7700.00 | Window Closed / Lapsed |