US4814012A
Expired / Lapsed
US
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Method of manufacturing a bonded particulate article by reacting a hydrolyzed amylaceous product and a heterocyclic compound
Assignee: Wyeth Holdings LLC
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Filing: 1987-12-07
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Granted: 1989-03-21
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Expires: 2007-12-07
Abstract
Abstract Disclosed herein is a method of manufacturing a bonded particulate article by admixing particulate material with a binder system, the binder system being formed by admixing a polyol comprising a water soluble amylaceous hydrolyzate with a heterocyclic compound comprising the reaction product of glyoxal, urea, and formaldehyde, alone, or in further combination with ethylene glycol, with a solvent, and with an acid effective to control the rate of cross-linking between said polyol and said heterocyclic compound; forming the admixture in a shape and curing the shape to a bonded article.
Inventors
- 👤 Albert P. Paul
- 👤 Richard A. Szarz
- 👤 Roger J. Card
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:42
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/003; C08B31/006; B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/26; C08L; C08L97/00; C08L97/02; D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/64
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
67 words
A curable composition adapted to produce a shaped bonded particulate article, said composition comprising (i) a particulate material; and, as a binder therefor, (ii) a polyol comprising a hydrolyzed, gelatinized amylaceous material; (iii) a crosslinker for said polyol (ii) comprising the reaction product of glyoxal, urea and formaldehyde, alone, on in further combination with ethylene glycol; (iv) an acid catalyst; and (v) a solvent for the binder.
Claim 2
Dependent Claim
67 words
A curable composition adapted to produce a shaped bonded particulate article, said composition comprising (i) a particulate material; and, as a binder therefor, (ii) a polyol comprising a hydrolyzed, gelatinized amylaceous material; (iii) a crosslinker for said polyol (ii) comprising the reaction product of glyoxal, urea and formaldehyde, alone, on in further combination with ethylene glycol; (iv) an acid catalyst; and (v) a solvent for the binder.
Claim 3
Dependent Claim
70 words
A curable composition as defined in claim 1 wherein particulate material (i) comprises 80%-99% by weight and said binder comprises from 1%-20% by weight, the amount of polyol (ii) in said binder comprising 20%-55%; the amount of crosslinker (iii) in said binder comprising 3%-60%; the amount of acid (iv) in said binder comprising 0.2%-10% and the amount of solvent (v) in said binder comprising 15%-85%, all percentages being by weight.
Claim 4
Dependent Claim
15 words
A curable composition as defined in claim 1 wherein the particulate mateial (i) is sand.
Claim 5
Dependent Claim
142 words
A curable composition as defined in claim 1 wherein the polyol (ii) is the product of a process comprising the steps in the following sequence: (a) hydrolyzing a material selected from corn flour, corn meal, corn grits, corn starch, sorghum flour, sorghum meal, sorghym grits, wheat flour, wheat starch, or a mixture of any of the foregoing at moistures between 5 and 12% by weight of the humidified material using between 0.1 and 2% by weight acid; (b) adjusting the pH of the acid hydrolyzed amylaceous material to between 3 and 6 obtained on a 10% solids water slurry; (c) gelatinizing the pH adjusted acid hydrolyzed amylaceous material at moisture levels between 15 and 40% and at temperatures of between 212° F. and 400° F.; (d) removing water from the gelatinized product; and (e) comminuting the dried anylaceous mass to a flour.
Claim 6
Dependent Claim
25 words
A curable composition as defined in claim 1 wherein said crosslinker (iii) is a compound of the formulae ##STR5## or a mixture of such compounds.
Claim 7
Dependent Claim
35 words
A curable composition as defined in claim 1 wherein said acid is an inorganic acid, an organic acid, a Lewis acid, a Bronsted acid or a metal or nonmetal salt which acts as an acid.
Claim 8
Dependent Claim
13 words
A curable composition as defined in claim 1 wherein said solvent is water.
Claim 9
Dependent Claim
60 words
A bonded particulate article manufactured by (i) admixing 80%-99% of particulate material with 1%-20% of binder system, the binder system being formed by admixing 20-55% of saccharide material, 3%-60% of crosslinker comprising the reaction product of glyoxal, urea and formaldehyde, 0.2%-10% of an acid, and 15%-85% of solvent by weight; (ii) forming the admixture into a shape; and (iii) curing.
Claim 10
Dependent Claim
60 words
A bonded particulate article manufactured by (i) admixing 80%-99% of particulate material with 1%-20% of binder system, the binder system being formed by admixing 20-55% of saccharide material, 3%-60% of crosslinker comprising the reaction product of glyoxal, urea and formaldehyde, 0.2%-10% of an acid, and 15%-85% of solvent by weight; (ii) forming the admixture into a shape; and (iii) curing.
Claim 11
Dependent Claim
23 words
A bonded particulate article as defined in claim 8 wherein the particulate material is sand and the bonded article is a foundry core.
References Cited (Backward Citations)
US4705570A
Cited
US4711669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-20 | 1992-09-19 | 1993-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-20 | 1996-09-19 | 1997-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-20 | 2000-09-19 | 2001-03-21 | $7700.00 | Window Closed / Lapsed |