US3917558A
Expired / Lapsed
US
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Foundry resins treated with nitro compounds
Assignee: Ashland LLC
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Filing: 1974-04-01
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Granted: 1975-11-04
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Expires: 1994-04-01
Abstract
Abstract Nitro compounds (for example, nitromethane) are added to synthetic resins to reduce the concentration of free formaldehyde present therein.
Inventors
- 👤 John J Gardikes
- 👤 Young D Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:30
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; C; C08; C08K; C08K5/00; C08K5/16; C08K5/32
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
48 words
A RESIN COMPOSITION COMPRISING: A. A FOUNDRY BINDER RESIN SELECTED FROM THE GROUP CONSISTING OF FURFURYL ALCOHOL-FORMALDEHYDR, UREA/FURFURYL ALCOHOLFORMALDEHYED, PHENOL-FURFURYL ALCOHOL-FORMAKDEHYDE, PHENOL/UREA/FURFURYL ALCOHOL-FORMALDEHYDE, PHENOL-FORMALDEHYDE, AND UREA/PHENOL-FORMALDEHYDE, AND MIXTURES THEREOF AND B. THE REACTION PRODUCT OF FREE FORMALDEHYDE PRESENT IN SAID RESIN AND A NITRO COMPOUND HAVING THE FORMULA:
Claim 2
Dependent Claim
48 words
A RESIN COMPOSITION COMPRISING: A. A FOUNDRY BINDER RESIN SELECTED FROM THE GROUP CONSISTING OF FURFURYL ALCOHOL-FORMALDEHYDR, UREA/FURFURYL ALCOHOLFORMALDEHYED, PHENOL-FURFURYL ALCOHOL-FORMAKDEHYDE, PHENOL/UREA/FURFURYL ALCOHOL-FORMALDEHYDE, PHENOL-FORMALDEHYDE, AND UREA/PHENOL-FORMALDEHYDE, AND MIXTURES THEREOF AND B. THE REACTION PRODUCT OF FREE FORMALDEHYDE PRESENT IN SAID RESIN AND A NITRO COMPOUND HAVING THE FORMULA:
Claim 3
Dependent Claim
33 words
The composition of claim 1 wherein the nitro compound is nitromethane present in a weight ratio of 90 parts of formaldehyde to between about 25 and about 61 parts by weight of nitromethane.
Claim 4
Dependent Claim
13 words
The composition of claim 2 wherein said resin is furfuryl alcohol/urea formaldehyde resin.
Claim 5
Dependent Claim
13 words
The composition of claim 2 wherein said resin is a furfuryl alcohol-formaldehyde resin.
Claim 6
Dependent Claim
12 words
The composition of claim 2 wherein said resin is a phenol-formaldehyde resin.
Claim 7
Dependent Claim
24 words
The composition of claim 1 wherein the mole ratio of nitro compound to originally present free formaldehyde is between about 1:3 and about 1:1.
Claim 8
Dependent Claim
19 words
The composition of claim 6 wherein the nitro compound is selected from the group consisting of 1- and 2-nitropropane.
Claim 9
Dependent Claim
66 words
A foundry mix comprising sand as the major constituent and a binding amount of up to about 10 percent by weight of sand of a thermosetting resin selected from the group consisting of furfuryl alcohol-formaldehyde, urea/furfuryl alcohol-formaldehyde, phenol/furfuryl alcohol-formaldehyde, phenol/urea/furfuryl alcohol-formaldehyde, phenol-formaldehyde, urea/phenol-formaldehyde, and mixtures thereof and containing the reaction product of free formaldehyde originally present in said resin and a nitro compound having the formula:
Claim 10
Dependent Claim
66 words
A foundry mix comprising sand as the major constituent and a binding amount of up to about 10 percent by weight of sand of a thermosetting resin selected from the group consisting of furfuryl alcohol-formaldehyde, urea/furfuryl alcohol-formaldehyde, phenol/furfuryl alcohol-formaldehyde, phenol/urea/furfuryl alcohol-formaldehyde, phenol-formaldehyde, urea/phenol-formaldehyde, and mixtures thereof and containing the reaction product of free formaldehyde originally present in said resin and a nitro compound having the formula:
Claim 11
Dependent Claim
37 words
The composition of claim 8 wherein said nitro compound is selected from the group consisting of nitromethane, 1-, and 2-nitropropane in a mole ratio of nitro compound to free formaldehyde of between about 1:3 and about 1:1.
Claim 12
Dependent Claim
14 words
The composition of claim 9 wherein said resin is a furfuryl alcohol/urea formaldehyde resin.
Claim 13
Dependent Claim
13 words
The composition of claim 9 wherein said resin is a furfuryl alcohol-formaldehyde resin.
Claim 14
Dependent Claim
12 words
The composition of claim 9 wherein said resin is a phenol-formaldehyde resin.
Claim 15
Dependent Claim
88 words
The process of preparing shaped foundry products which comprises: a. forming a foundry mix by uniformly distributing on a foundry aggregate containing sand as the major constituent a binding amount of up to about 10 percent by weight of the weight of aggregate of a resin composition selected from the group consisting of furfuryl alcohol-formaldehyde, urea/furfuryl alcohol-formaldehyde, phenol/furfuryl alcohol-formaldehyde, phenol/urea/furfuryl alcohol-formaldehyde, phenol-formaldehyde, and urea/phenol-formaldehyde, resins and mixtures thereof and containing the reaction product of free fromaldehyde originally present iN said resin and a nitro compound having the formula:
Claim 16
Dependent Claim
88 words
The process of preparing shaped foundry products which comprises: a. forming a foundry mix by uniformly distributing on a foundry aggregate containing sand as the major constituent a binding amount of up to about 10 percent by weight of the weight of aggregate of a resin composition selected from the group consisting of furfuryl alcohol-formaldehyde, urea/furfuryl alcohol-formaldehyde, phenol/furfuryl alcohol-formaldehyde, phenol/urea/furfuryl alcohol-formaldehyde, phenol-formaldehyde, and urea/phenol-formaldehyde, resins and mixtures thereof and containing the reaction product of free fromaldehyde originally present iN said resin and a nitro compound having the formula:
Claim 17
Dependent Claim
20 words
The process of claim 13 wherein said nitro compound is selected from the group consisting of nitromethane, 1-, and 2-nitropropane.
Claim 18
Dependent Claim
33 words
The process of claim 14 wherein said nitro compound is nitromethane present in a weight ratio of 90 parts of formaldehyde to between about 25 and about 61 parts by weight of nitromethane.
Claim 19
Dependent Claim
24 words
The process of claim 14 wherein said nitro compound is present in a mole ratio of formaldehyde to nitromethane of up to about 3:1.
Claim 20
Dependent Claim
59 words
A process for minimizing the free formaldehyde content of a synthetic resin selected from the group consisting of furfuryl alcohol-formaldehyde, urea/furfuryl alcohol-formaldehyde, phenol/furfuryl alcohol-formaldehyde, phenol/urea/furfuryl alcohol-formaldehyde, phenol-formaldehyde, urea/phenol-formaldehyde resins and mixtures thereof comprising: a. maintaining the pH value of said resin above about 7; b. adding a nitro compound to said synthetic resin, said nitro compound having the formula:
Claim 21
Dependent Claim
59 words
A process for minimizing the free formaldehyde content of a synthetic resin selected from the group consisting of furfuryl alcohol-formaldehyde, urea/furfuryl alcohol-formaldehyde, phenol/furfuryl alcohol-formaldehyde, phenol/urea/furfuryl alcohol-formaldehyde, phenol-formaldehyde, urea/phenol-formaldehyde resins and mixtures thereof comprising: a. maintaining the pH value of said resin above about 7; b. adding a nitro compound to said synthetic resin, said nitro compound having the formula:
Claim 22
Dependent Claim
21 words
The process of claim 17 wherein the mole ratio of free formaldehyde to nitro compound is between about 3:1 and 1:1.
Claim 23
Dependent Claim
20 words
The process of claim 18 wherein said nitro compound is selected from the group consisting of nitromethane, 1-, and 2-nitropropane.
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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |