US4194918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkali metal silicate binder compositions
Assignee: Foseco International Ltd
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Filing: 1977-11-11
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Granted: 1980-03-25
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Expires: 1997-11-11
Abstract
Abstract The invention relates to alkali metal silicate binder compositions, particularly for use in the production of foundry moulds and cores. The binders of the invention are in aqueous solution and are obtained by mixing: (i) an alkali metal silicate, (ii) a substantially water soluble carbohydrate selected from glycans; glycan oligosaccharides; glycanitols; glycanitol derivatives of oligosaccharides; and monosaccharides and disaccharides and derivatives thereof, and (iii) an oxyanion of boron, tin, germanium, tellurium or arsenic, which can form with the carbohydrate a water soluble complex. The binders of the invention give better breakdown properties and improved surface finish of metal castings produced using moulds and cores formed using the binders.
Inventors
- 👤 Raymond D. George
- 👤 John Stevenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:37
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/24; C04B28/26; B; B22; B22C; B22C1/00; B22C1/16; B22C1/18; B22C1/186; B22C1/188; C09; C09J; C09J103/00; C08; C08L; C08L2666/00; C08L2666/54
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
90 words
A binder composition consisting essentially of an aqueous solution prepared by mixing in the absence of heating: an alkali metal silicate, a substantially water soluble carbohydrate selected from the group consisting of (1) glycans, (2) monosaccharides, (3) disaccharides and (4) stabilised carbohydrates having a reducing power which has been removed by hydrogenation, etherification, esterification, oxidation or by reaction with urea or urea derivative, an oxyanion which forms a water soluble complex with the carbohydrate selected from the group consisting of oxyanions of boron, tin, germanium, tellurium or arsenic, and water.
Claim 2
Dependent Claim
90 words
A binder composition consisting essentially of an aqueous solution prepared by mixing in the absence of heating: an alkali metal silicate, a substantially water soluble carbohydrate selected from the group consisting of (1) glycans, (2) monosaccharides, (3) disaccharides and (4) stabilised carbohydrates having a reducing power which has been removed by hydrogenation, etherification, esterification, oxidation or by reaction with urea or urea derivative, an oxyanion which forms a water soluble complex with the carbohydrate selected from the group consisting of oxyanions of boron, tin, germanium, tellurium or arsenic, and water.
Claim 3
Dependent Claim
15 words
A binder composition according to claim 1, wherein the alkali metal silicate is sodium silicate.
Claim 4
Dependent Claim
28 words
A binder composition according to claim 1, wherein the alkali metal silicate is sodium silicate having an SiO 2 :Na 2 O ratio of from 2.0:1 to 2.5:1.
Claim 5
Dependent Claim
27 words
A binder composition according to claim 1, wherein the oxyanion is present as an oxyanion salt in an amount up to 5% by weight of the composition.
Claim 6
Dependent Claim
21 words
A binder composition according to claim 1, wherein the monosaccharide is selected from the group consisting of glucose, mannose and fructose.
Claim 7
Dependent Claim
21 words
A binder composition according to claim 1, wherein the disaccharide is selected from the group consisting of sucrose, maltose and lactose.
Claim 8
Dependent Claim
15 words
A binder composition according to claim 1, wherein the stabilized carbohydrate is a starch hydrolysate.
Claim 9
Dependent Claim
21 words
A binder composition according to claim 1, wherein the stabilised carbohydrate is selected from the group consisting of hexitols and pentitols.
Claim 10
Dependent Claim
21 words
A binder composition according to claim 1, wherein the stabilised carbohydrate is a starch hydrolysate having a dextrose equivalent below 5.
Claim 11
Dependent Claim
29 words
A binder composition according to claim 1, wherein the oxyanion is provided by a compound selected from the group consisting of alkali metal borates, stannates, tellurites, germanates and arsenites.
Claim 12
Dependent Claim
36 words
A binder composition according to claim 1, wherein the oxyanion is provided by a compound selected from the group consisting of sodium metaborate, sodium tetraborate, sodium pentaborate, sodium stannate, sodium tellurite, sodium germanate and sodium arsenite.
Claim 13
Dependent Claim
35 words
A binder composition according to claim 1 obtained by mixing 26 to 45% by weight of alkali metal silicate, 3 to 27% by weight of carbohydrate and 0.5 to 2% by weight of oxyanion salt.
Claim 14
Independent Claim
108 words
A method of making an article of bonded particulate material, which method comprises mixing together in the absence of heating, the particulate material, an alkali metal silicate, a substantially water soluble carbohydrate selected from the group consisting of (1) glycans, (2) monosaccharides, (3) disaccharides and (4) stabilised carbohydrates having a reducing power which has been removed by hydrogenation, etherification, esterification, oxidation or by reaction with urea or urea derivative, an oxyanion which forms a water soluble complex with the carbohydrate selected from the group consisting of oxyanions of boron, tin, germanium, tellurium or arsenic, and water, forming the mixture to the desired shape, and hardening the shaped mixture.
Claim 15
Independent Claim
108 words
A method of making an article of bonded particulate material, which method comprises mixing together in the absence of heating, the particulate material, an alkali metal silicate, a substantially water soluble carbohydrate selected from the group consisting of (1) glycans, (2) monosaccharides, (3) disaccharides and (4) stabilised carbohydrates having a reducing power which has been removed by hydrogenation, etherification, esterification, oxidation or by reaction with urea or urea derivative, an oxyanion which forms a water soluble complex with the carbohydrate selected from the group consisting of oxyanions of boron, tin, germanium, tellurium or arsenic, and water, forming the mixture to the desired shape, and hardening the shaped mixture.
References Cited (Backward Citations)
US2772996A
Cited
US4070196A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-25 | 1983-09-24 | 1984-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-25 | 1987-09-24 | 1988-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-25 | 1991-09-24 | 1992-03-25 | $7700.00 | Window Closed / Lapsed |