US4293480A
Expired / Lapsed
US
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Urethane binder compositions for no-bake and cold box foundry application utilizing isocyanato-urethane polymers
Assignee: Ashland Inc
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Filing: 1979-05-11
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Granted: 1981-10-06
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Expires: 1999-05-11
Abstract
Abstract Foundry cores and molds for casting metals are prepared by forming a binder comprising a polyol, an isocyanato urethane polymer and a urethane catalyst. The foundry cores and molds of this invention are formed by processes known in the industry as the "cold box" process and the no-bake process. The binder is especially useful for casting non-ferrous metals, for example, the casting of aluminum, magnesium and other lightweight metals. The cores and molds produced for casting aluminum and other lightweight metals exhibit excellent shakeout while retaining other desirable core and mold properties.
Inventors
- 👤 Ralph D. Martin
- 👤 William R. Dunnavant
- 👤 Gregory P. Sturtz
- 👤 Heimo J. Langer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:29
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8009; B22C1/2233; B22C1/2273; C08G18/28; C08G18/40; C08G18/54; C08G18/542; C08L; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
51 words
A binder composition useful for making shaped foundry articles for use in casting lightweight metals, which articles collapse after casting of said lightweight metals, comprising in admixture a polyol component, an isocyanate component comprising an isocyanato urethane polymer wherein all hydroxy groups of said polymer are capped and a curing agent.
Claim 2
Dependent Claim
51 words
A binder composition useful for making shaped foundry articles for use in casting lightweight metals, which articles collapse after casting of said lightweight metals, comprising in admixture a polyol component, an isocyanate component comprising an isocyanato urethane polymer wherein all hydroxy groups of said polymer are capped and a curing agent.
Claim 3
Dependent Claim
85 words
The binder composition of claim 1 wherein the polyol component comprises a phenolic resin having the general formula: ##STR4## G. phenyl propyl pyridine wherein R is hydrogen or a phenolic substitute meta to the hydroxyl group of the phenol, M and N are numbers the sum of which is at least 2, and the ratio of M to N is at least 1, and X is a hydrogen or a methylol group, the molar ratio of said methylol group to hydrogen being at least 1.
Claim 4
Dependent Claim
43 words
The binder composition of claim 2 wherein the isocyanato urethane polymer is the reaction product of a polyhydroxy compound and a polyisocyanate, wherein the molar equivalent of NCO groups of said polyisocyanate exceeds the molar equivalent of OH groups of said polyhydroxy compound.
Claim 5
Dependent Claim
13 words
The binder composition of claim 3 wherein the polyisocyanate component comprises tolylene diisocyante.
Claim 6
Dependent Claim
12 words
The binder composition of claim 3 wherein the polyhydroxy compound comprises glycerine.
Claim 7
Dependent Claim
13 words
The binder composition of claim 3 wherein the polyhydroxy compound comprises diethylene glycol.
Claim 8
Dependent Claim
13 words
The binder composition of claim 3 wherein the polyhydroxy compound comprises trimethylol propane.
Claim 9
Dependent Claim
14 words
The binder composition of claim 1 wherein the curing agent comprises a urethane catalyst.
Claim 10
Dependent Claim
20 words
The binder composition of claim 1 wherein the curing agent comprises a tertiary amine which is gaseous at room temperature.
Claim 11
Dependent Claim
111 words
Process of forming shaped foundry articles for use in casting lightweight metals, which articles collapse after casting of said lightweight metals, comprising: (a) Forming a foundry mix by distributing on an aggregate a binding amount of up to 10%, based upon the weight of the aggregate, of a binder composition, said composition comprising in admixture a polyol component and an isocyanate component, said isocyanate component comprising an isocyanato urethane polymer wherein all hydroxy groups of said polymer are capped. (b) Shaping the foundry mix into a desired foundry article; and (c) Contacting the shaped foundry mix with a tertiary amine which is gaseous at room temperature until the binder has cured.
Claim 12
Dependent Claim
111 words
Process of forming shaped foundry articles for use in casting lightweight metals, which articles collapse after casting of said lightweight metals, comprising: (a) Forming a foundry mix by distributing on an aggregate a binding amount of up to 10%, based upon the weight of the aggregate, of a binder composition, said composition comprising in admixture a polyol component and an isocyanate component, said isocyanate component comprising an isocyanato urethane polymer wherein all hydroxy groups of said polymer are capped. (b) Shaping the foundry mix into a desired foundry article; and (c) Contacting the shaped foundry mix with a tertiary amine which is gaseous at room temperature until the binder has cured.
Claim 13
Dependent Claim
42 words
The process of claim 10 wherein the isocyanato urethane polymer is the reaction product of a polyhydroxy compound and a polyisocyanate, wherein the molar equivalent of NCO groups of said polyisocyanate exceeds the molar equivalent of OH groups of said polyhydroxy compound.
Claim 14
Dependent Claim
12 words
The process of claim 11 wherein the polyisocyanate component comprises tolylene diisocyanate.
Claim 15
Dependent Claim
11 words
The process of claim 11 wherein the polyhydroxy compound comprises glycerine.
Claim 16
Dependent Claim
12 words
The process of claim 11 wherein the polyhydroxy compound comprises diethylene glycol.
Claim 17
Dependent Claim
12 words
The process of claim 11 wherein the polyhydroxy compound comprises trimethylol propane.
Claim 18
Dependent Claim
80 words
The process of claim 11 wherein the polyol component comprises a phenolic resin having the general formula: ##STR5## wherein R is hydrogen or a phenolic substitute meta to the hydroxyl group of the phenol, M and N are numbers the sum of which is at least 2, and the ratio of M to N is at least 1, and X is a hydrogen or a methylol group, the molar ratio of said methylol group to hydrogen being at least 1.
Claim 19
Dependent Claim
100 words
Process of forming shaped foundry articles for use in casting lightweight metals, which articles collapse after casting of said lightweight metals, comprising: (a) Forming a foundry mix by distributing on an aggregate a binding amount of up to 10%, based upon the weight of the aggregate, of a binder composition, said composition comprising in admixture a polyol component and an isocyanate component, and a curing agent, said isocyanate component comprising an isocyanato urethane polymer wherein all hydroxy groups of said polymer are capped. (b) Shaping the foundry mix into a desired foundry article; and (c) Allowing the article to cure.
Claim 20
Dependent Claim
100 words
Process of forming shaped foundry articles for use in casting lightweight metals, which articles collapse after casting of said lightweight metals, comprising: (a) Forming a foundry mix by distributing on an aggregate a binding amount of up to 10%, based upon the weight of the aggregate, of a binder composition, said composition comprising in admixture a polyol component and an isocyanate component, and a curing agent, said isocyanate component comprising an isocyanato urethane polymer wherein all hydroxy groups of said polymer are capped. (b) Shaping the foundry mix into a desired foundry article; and (c) Allowing the article to cure.
Claim 21
Dependent Claim
42 words
The process of claim 17 wherein the isocyanato urethane polymer is the reaction product of a polyhydroxy compound and a polyisocyanate, wherein the molar equivalent of NCO groups of said polyisocyanate exceeds the molar equivalent of OH groups of said polyhydroxy compound.
Claim 22
Dependent Claim
12 words
The process of claim 18 wherein the polyisocyanate component comprises tolylene diisocyanate.
Claim 23
Dependent Claim
11 words
The process of claim 18 wherein the polyhydroxy compound comprises glycerine.
Claim 24
Dependent Claim
12 words
The process of claim 18 wherein the polyhydroxy compound comprises diethylene glycol.
Claim 25
Dependent Claim
12 words
The process of claim 18 wherein the polyhydroxy compound comprises trimethylol propane.
Claim 26
Dependent Claim
80 words
The process of claim 18 wherein the polyol component comprises a phenolic resin having the general formula: ##STR6## wherein R is hydrogen or a phenolic substitute meta to the hydroxyl group of the phenol, M and N are numbers the sum of which is at least 2, and the ratio of M to N is at least 1, and X is a hydrogen or a methylol group, the molar ratio of said methylol group to hydrogen being at least 1.
Claim 27
Dependent Claim
13 words
The process of claim 17 wherein the curing agent is a urethane catalyst.
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) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |