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US3947392A
Expired / Lapsed
US
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Foundry sand compositions containing graft copolymers of biochemically-synthesized heteropolysaccharides
Assignee: Applied Industrial Materials Corp
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Filing: 1971-10-01
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Granted: 1976-03-30
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Expires: 1991-10-01
Abstract
Abstract A sand core and mold composition for use in casting metals comprising foundry sand, clay, water and from about 0.0025% to about 1% by weight of a water-soluble graft copolymer of acrylic acid and a minor amount of a water-soluble polyhydroxy polymeric compound, including water-soluble salts thereof.
Inventors
- 👤 William J. Lang
- 👤 John J. Krajewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:43
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/1305; B; B22; B22C; B22C1/00; B22C1/16; B22C1/167; C08; C08F; C08F251/00; C08F261/00; C08F261/02; C08F261/04; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
107 words
A foundry molding composition comprising a major amount of foundry sand and minor amounts of clay, water, and a water-soluble graft copolymer, said graft copolymer being present in an amount sufficient to enhance the workability of said composition and being of the group consisting of a graft copolymerization product of acrylic acid and from about 0.1 to about 10% by weight, based on the weight of said acrylic acid, of a biochemically-synthesized heteropolysaccharide, and water-soluble salts of said graft copolymerization product, said biochemically-synthesized heteropolysaccharide containing at least about 5% free hydroxyl groups and being free of substituents other than hydroxyl groups that are reactive with acrylic acid.
Claim 2
Dependent Claim
107 words
A foundry molding composition comprising a major amount of foundry sand and minor amounts of clay, water, and a water-soluble graft copolymer, said graft copolymer being present in an amount sufficient to enhance the workability of said composition and being of the group consisting of a graft copolymerization product of acrylic acid and from about 0.1 to about 10% by weight, based on the weight of said acrylic acid, of a biochemically-synthesized heteropolysaccharide, and water-soluble salts of said graft copolymerization product, said biochemically-synthesized heteropolysaccharide containing at least about 5% free hydroxyl groups and being free of substituents other than hydroxyl groups that are reactive with acrylic acid.
Claim 3
Dependent Claim
38 words
A foundry molding composition in accordance with claim 1 containing from about 0.0025 to about 1% by weight of said graft copolymer, and said graft copolymerization product is an ultraviolet light or peroxygen-type compound induced graft copolymerization product.
Claim 4
Dependent Claim
44 words
A foundry molding composition in accordance with claim 2 comprising from about 84 to about 96% by weight of said foundry sand, from about 3 to about 10% by weight of said clay, and from about 1 to about 5.5% by weight of water.
Claim 5
Dependent Claim
23 words
A foundry molding composition in accordance with claim 3 wherein said graft copolymerization product is a peroxide free radical induced graft copolymerization product.
Claim 6
Dependent Claim
47 words
A foundry molding composition in accordance with claim 4 wherein said graft copolymerization product is a hydrogen peroxide or hydroperoxide-induced graft copolymerization product of acrylic acid and from about 0.25 to about 5% by weight, based on the weight of said acrylic acid, of said biochemically-synthesized heteropolysaccharide.
Claim 7
Dependent Claim
14 words
A foundry molding composition in accordance with claim 4 including said graft copolymerization product.
Claim 8
Dependent Claim
18 words
A foundry molding composition in accordance with claim 4 including a water-soluble salt of said graft copolymerization product.
Claim 9
Dependent Claim
19 words
A foundry molding composition in accordance with claim 7 including an alkali metal salt of said graft copolymerization product.
Claim 10
Dependent Claim
18 words
A foundry molding composition in accordance with claim 8 including a sodium salt of said graft copolymerization product.
Claim 11
Dependent Claim
20 words
A foundry molding composition in accordance with claim 4 wherein a major proportion of said clay is a bentonitic clay.
Claim 12
Dependent Claim
40 words
A foundry molding composition in accordance with claim 4 wherein a major proportion of said clay is a sub-bentonitic clay treated with from about 0.5 to about 6% by weight, based on the weight of said clay, of soda ash.
Claim 13
Dependent Claim
67 words
A foundry molding composition in accordance with claim 5 comprising from about 89 to about 93% by weight of said sand, from about 5 to about 7.5% by weight of said clay, from about 2 to about 4% by weight of water, from about 0.01 to about 0.5% by weight of said graft copolymer, and from about 0.05 to about 1% by weight of a water-soluble borate.
Claim 14
Dependent Claim
86 words
A foundry molding composition in accordance with claim 5 comprising from about 89 to about 93% by weight of said sand, from about 5 to about 7.5% by weight of said clay, from about 2 to about 4% by weight of water, and from about 0.05 to about 0.1% by weight of said graft copolymer, a major proportion of said clay being a sub-benonitic clay treated with from about 0.5 to about 6% by weight, based on the weight of said sub-bentonitic clay, of soda ash.
Claim 15
Dependent Claim
64 words
A foundry molding composition in accordance with claim 5 comprising from about 89 to about 93% by weight of said sand, from about 5 to about 7.5% by weight of said clay having a bentonitic clay as a major proportion thereof, from about 2 to about 4% by weight of water, and from about 0.05 to about 0.1% by weight of said graft copolymer.
Claim 16
Dependent Claim
72 words
A foundry molding composition in accordance with claim 5 comprising from about 89 to about 93% by weight of said sand, from about 5 to about 7.5% by weight of said clay having a bentonitic clay as a major proportion thereof, from about 2 to about 4% by weight of water, and from about 0.05 to about 0.1% by weight of an alkali metal or ammonium salt of said graft copolymerization product.
Claim 17
Dependent Claim
94 words
A foundry molding composition from about 84 to about 96% by weight of a foundry sand, from about 3 to about 10% by weight of clay, from about 1 to about 5.5% by weight of water, and from about 0.0025 to about 1% by weight of a graft copolymer, said graft copolymer being a hydroperoxide or hydrogen peroxide-induced graft copolymerization product of acrylic acid and from about 0.25 to about 5% by weight, based on the weight of said acrylic acid, of a biochemically-synthesized heteropolysaccharide, or a water-soluble salt of said graft copolymerization product.
Claim 18
Dependent Claim
94 words
A foundry molding composition from about 84 to about 96% by weight of a foundry sand, from about 3 to about 10% by weight of clay, from about 1 to about 5.5% by weight of water, and from about 0.0025 to about 1% by weight of a graft copolymer, said graft copolymer being a hydroperoxide or hydrogen peroxide-induced graft copolymerization product of acrylic acid and from about 0.25 to about 5% by weight, based on the weight of said acrylic acid, of a biochemically-synthesized heteropolysaccharide, or a water-soluble salt of said graft copolymerization product.
References Cited (Backward Citations)
US3640826A
Cited
US3644113A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |