Patent US4518723A successfully refreshed from Google Patents.
US4518723A
Expired / Lapsed
US
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Curable epoxy resin compositions and use in preparing formed, shaped, filled bodies
Assignee: Ashland Inc
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Filing: 1982-10-22
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Granted: 1985-05-21
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Expires: 2002-10-22
Abstract
Abstract Curable epoxy resin compositions are described which comprise a mixture of an acid curable epoxy resin and a minor amount of an oxidizing agent capable of reacting with sulfur dioxide to form a catalyst for curing said epoxy resin. The curable epoxy resin composition may contain solid particulate materials. The procedures for curing such epoxy resins as well as methods for forming sand cores and molds also are described. Sand cores and molds produced in accordance with the method of the invention have sufficient strength and hardness after a few seconds of curing for normal foundry applications.
Inventors
- 👤 Wayne D. Woodson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:20
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2206; B22C1/222; B22C1/2233; B22C1/224; B22C1/2246; B22C1/226; C08L; C08L63/00
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
46 words
A curable epoxy resin composition comprising a mixture of an acid curable epoxy resin and from about 15 to 50% based on the weight of the resin of an oxidizing agent capable of reacting with sulfur dioxide to form a catalyst for curing said epoxy resin.
Claim 2
Dependent Claim
46 words
A curable epoxy resin composition comprising a mixture of an acid curable epoxy resin and from about 15 to 50% based on the weight of the resin of an oxidizing agent capable of reacting with sulfur dioxide to form a catalyst for curing said epoxy resin.
Claim 3
Dependent Claim
12 words
The composition of claim 1 wherein the oxidizing agent is a peroxide.
Claim 4
Dependent Claim
30 words
The composition of claim 2 wherein the peroxide is methyl ethyl ketone peroxide, cumene hydroperoxide, paramenthane hydroperoxide, t-butyl hydroperoxide, diisopropyl benzene hydroperoxide, admixtures thereof or admixtures thereof with hydrogen peroxide.
Claim 5
Dependent Claim
41 words
The composition of claim 1 wherein the epoxy resin is a modified epoxy resin containing up to about 50 percent by weight of a vinyl monomer, furfuryl alcohol, polyfurfuryl alcohol, resorcinol, a formaldehyde based thermosetting resin, urethane resin or mixtures thereof.
Claim 6
Dependent Claim
21 words
The composition of claim 4 wherein the formaldehyde based thermosetting resin is a phenol formaldehyde resin or a urea formaldehyde resin.
Claim 7
Dependent Claim
71 words
A curable epoxy resin composition comprising a mixture of (a) a major amount of a solid particulate material, and (b) a minor amount of (i) an acid curable epoxy resin and (ii) an oxidizing agent capable of reacting with sulfur dioxide to form a catalyst for curing said epoxy resin, the weight for oxidizing agent being from about 15 to about 50% by weight based on the weight of the resin.
Claim 8
Dependent Claim
71 words
A curable epoxy resin composition comprising a mixture of (a) a major amount of a solid particulate material, and (b) a minor amount of (i) an acid curable epoxy resin and (ii) an oxidizing agent capable of reacting with sulfur dioxide to form a catalyst for curing said epoxy resin, the weight for oxidizing agent being from about 15 to about 50% by weight based on the weight of the resin.
Claim 9
Dependent Claim
51 words
The composition of claim 6 wherein the composition comprises from about 0.2 to about 15 percent by weight of the epoxy resin based on the weight of the particulate material, and the oxidizing agent comprises from about 15 to about 40 percent by weight based on the weight of said resin.
Claim 10
Dependent Claim
12 words
The composition of claim 5 wherein said oxidizing agent is a peroxide.
Claim 11
Dependent Claim
30 words
The composition of claim 8 wherein the peroxide is methyl ethyl ketone peroxide, cumene hydroperoxide, paramenthane hydroperoxide, t-butyl hydroperoxide, diisopropyl benzene hydroperoxide, admixtures thereof or admixtures thereof with hydrogen peroxide.
Claim 12
Dependent Claim
41 words
The composition of claim 6 wherein the epoxy resin is a modified epoxy resin containing up to about 50 percent by weight of a vinyl monomer, furfuryl alcohol, polyfurfuryl alcohol, resorcinol, a formaldehyde based thermosetting resin, urethane resin or mixtures thereof.
Claim 13
Dependent Claim
21 words
The composition of claim 10 wherein the formaldehyde based thermosetting resin is a phenol formaldehyde resin or a urea formaldehyde resin.
Claim 14
Dependent Claim
12 words
The composition of claim 6 wherein the solid particulate filler is sand.
Claim 15
Dependent Claim
14 words
The composition of claim 6 wherein the solid particulate filler comprises inorganic abrasive particles.
Claim 16
Dependent Claim
19 words
The composition of claim 10 wherein the epoxy resin is modified with a monofunctional, difunctional, trifunctional or tetrafunctional acrylate.
Claim 17
Independent Claim
59 words
A method of curing epoxy resins which comprises (a) preparing a mixture of an acid curable epoxy resin and a minor amount of an oxidizing agent capable of reacting with sulfur dioxide to form a catalyst for curing said epoxy resin, and (b) treating said mixture with gaseous sulfur dioxide to effect a rapid cure of the epoxy resin.
Claim 18
Independent Claim
59 words
A method of curing epoxy resins which comprises (a) preparing a mixture of an acid curable epoxy resin and a minor amount of an oxidizing agent capable of reacting with sulfur dioxide to form a catalyst for curing said epoxy resin, and (b) treating said mixture with gaseous sulfur dioxide to effect a rapid cure of the epoxy resin.
Claim 19
Dependent Claim
13 words
The method of claim 15 wherein the oxidizing agent is an organic peroxide.
Claim 20
Dependent Claim
38 words
The method of claim 15 wherein the mixture in (a) comprises from about 50 to about 90 percent by weight of an epoxy resin and from about 10 to about 50 percent by weight of said oxidizing agent.
Claim 21
Dependent Claim
30 words
The method of claim 16 wherein said peroxide is methyl ethyl ketone peroxide, cumene hydroperoxide, paramenthane hydroperoxide, t-butyl hydroperoxide, diisopropyl benzene hydroperoxide, admixtures thereof or admixtures thereof with hydrogen peroxide.
Claim 22
Dependent Claim
43 words
The method of claim 15 wherein the epoxy resin is an epoxy resin modified with up to about 50 percent by weight of an acrylic or vinyl monomer, furfuryl alcohol, polyfurfuryl alcohol, resorcinol, a formaldehyde based thermosetting resin, urethane resin or mixtures thereof.
Claim 23
Dependent Claim
38 words
The method of claim 15 wherein the mixture is contacted with sulfur dioxide for a period of from a fraction of a second to about five minutes at a temperature of from ambient temperature to about 150° C.
Claim 24
Dependent Claim
15 words
The method of claim 15 wherein the epoxy resin is a bisphenol A-type epoxy resin.
Claim 25
Dependent Claim
15 words
The method of claim 19 wherein the epoxy resin is modified with an acrylic monomer.
Claim 26
Dependent Claim
20 words
The method of claim 15 wherein the mixture of (a) also contains a major amount of discrete inorganic solid particulates.
Claim 27
Dependent Claim
10 words
The method of claim 23 wherein the particulates comprise sand.
Claim 28
Dependent Claim
67 words
A curable resin composition comprising a mixture of (a) an acid curable resin selected from the group consisting of vinyl or furfuryl-formaldehyde resins, (b) an acid curable epoxy resin, and (c) from about 15 to about 50% by weight, based on the combined weight of (a) and (b) of an oxidizing agent capable of reacting with sulfur dioxide to form a catalyst for curing said resin mixture.
Claim 29
Dependent Claim
67 words
A curable resin composition comprising a mixture of (a) an acid curable resin selected from the group consisting of vinyl or furfuryl-formaldehyde resins, (b) an acid curable epoxy resin, and (c) from about 15 to about 50% by weight, based on the combined weight of (a) and (b) of an oxidizing agent capable of reacting with sulfur dioxide to form a catalyst for curing said resin mixture.
Claim 30
Dependent Claim
20 words
The resin of claim 25 wherein the mixture comprises a major amount of (b) and a minor amount of (a).
Claim 31
Dependent Claim
14 words
The resin of claim 25 wherein the oxidizing agent is a peroxide or hydroperoxide.
Claim 32
Dependent Claim
13 words
The composition of claim 4 wherein the vinyl monomer is an acrylic monomer.
Claim 33
Dependent Claim
13 words
The composition of claim 10 wherein the vinyl monomer is an acrylic monomer.
Claim 34
Dependent Claim
13 words
The composition of claim 25 wherein the vinyl resin is an acrylic resin.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-20 | 1988-11-19 | 1989-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-20 | 1992-11-19 | 1993-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-20 | 1996-11-19 | 1997-05-21 | $7700.00 | Window Closed / Lapsed |