Patent US4178429A successfully refreshed from Google Patents.
US4178429A
Expired / Lapsed
US
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Catalyst for curing resins
Assignee: Individual
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Filing: 1978-11-17
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Granted: 1979-12-11
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Expires: 1998-11-17
Abstract
Abstract Process and catalyst for curing resins (e.g. furans) comprising concentrated aqueous solutions of perchloric acid (about 45-72%) and the cured resins obtained using said catalyst. Improved catalyst combinations for curing resins in a process employing same and the cured resin produced thereby comprising concentrated perchloric acid, a small amount of phosphoric acid and/or a small amount of boric acid.
Inventors
- 👤 Karl D. Scheffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:19
CPC Classifications
C; C08; C08L; C08L71/00; C08L71/08; C08L71/14; B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; C08K; C08K3/00; C08K3/01; C08K3/011; C08K3/16
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
23 words
A resin curing catalyst comprising an aqueous solution of perchloric acid in a concentration of about 45 to about 72% based on weight.
Claim 2
Dependent Claim
23 words
A resin curing catalyst comprising an aqueous solution of perchloric acid in a concentration of about 45 to about 72% based on weight.
Claim 3
Dependent Claim
26 words
A catalyst according to claim 1 which includes a combination of at least one member selected from the group consisting of phosphoric acid and boric acid.
Claim 4
Dependent Claim
32 words
A catalyst combination according to claim 2 wherein the member selected from said group is phosphoric acid and said perchloric acid and said phosphoric acids are present together in an aqueous solution.
Claim 5
Dependent Claim
15 words
A catalyst combination according to claim 3 which includes both phosphoric acid and boric acid.
Claim 6
Dependent Claim
27 words
A catalyst combination according to claim 3 wherein said phosphoric acid is present in an amount in the range of about 1 to about 10% by weight.
Claim 7
Dependent Claim
24 words
A catalyst combination according to claim 2 wherein the said perchloric acid is in a concentration of from about 50% to 60% by weight.
Claim 8
Dependent Claim
62 words
A catalyst combination according to claim 6 wherein phosphoric acid and boric acid are also present, wherein said phosphoric acid is present in an amount in the range of about 2 to about 3.5% by weight of catalyst solution and said boric acid is present in an amount in the range of about 1/2 to about 1% by weight of the sand.
Claim 9
Dependent Claim
31 words
A process of curing an acid catalyzed curing resin which comprises admixing said resin with an aqueous solution of perchloric acid containing about 45 to about 72% by weight of acid.
Claim 10
Dependent Claim
31 words
A process of curing an acid catalyzed curing resin which comprises admixing said resin with an aqueous solution of perchloric acid containing about 45 to about 72% by weight of acid.
Claim 11
Dependent Claim
30 words
A process according to claim 8 wherein said resin is also admixed with sand and at least one member selected from the group consisting of phosphoric acid and boric acid.
Claim 12
Dependent Claim
34 words
A process according to claim 9 wherein the member selected from said group is phosphoric acid and said perchloric acid and said phosphoric acid are mixed together as a preformed solution containing both acids.
Claim 13
Dependent Claim
19 words
A process according to claim 10 wherein said resin is admixed with both of said phosphoric and boric acids.
Claim 14
Dependent Claim
30 words
A process according to claim 10 wherein said phosphoric acid is employed in an amount in the range of about 1 to about 10% by weight of said catalyst solution.
Claim 15
Dependent Claim
23 words
A process according to claim 9 wherein said perchloric acid is in a concentration of from about 50% to about 60% by weight.
Claim 16
Dependent Claim
52 words
A process according to claim 11 wherein said phosphoric acid is present in an amount in the range of about 2 to about 3.5% by weight of the catalyst and said boric acid is present in an amount in the range of about 1/2 to about 1% by weight of the sand.
Claim 17
Dependent Claim
39 words
A process according to claim 8 wherein sand is added and said resin is a furan and said aqueous solution is employed at a level in the range of about 4 to about 10% by weight based on resin.
Claim 18
Dependent Claim
35 words
A process according to claim 9 wherein said resin is a furan and said aqueous solution is employed at a level in the range of about 6 to about 91/2% by weight based on resin.
Claim 19
Dependent Claim
35 words
A process according to claim 11 wherein said resin is a furan and said aqueous solution is employed at a level in the range of about 4 to about 11% by weight based on resin.
Claim 20
Dependent Claim
35 words
A process according to claim 14 wherein said resin is a furan and said aqueous solution is employed at a level in the range of about 4 to about 11% by weight based on resin.
Claim 21
Dependent Claim
35 words
A process according to claim 14 wherein said resin is a furan and said aqueous solution is employed at a level in the range of about 6 to about 91/2% by weight based on resin.
Claim 22
Dependent Claim
12 words
A process according to claim 8 wherein said resin is a furan.
Claim 23
Dependent Claim
12 words
A process according to claim 9 wherein said resin is a furan.
Claim 24
Dependent Claim
20 words
A cured resin composition comprising an acid catalyzed curing resinous compound having relatively uniformly distributed throughout same concentrated perchloric acid.
Claim 25
Dependent Claim
20 words
A cured resin composition comprising an acid catalyzed curing resinous compound having relatively uniformly distributed throughout same concentrated perchloric acid.
Claim 26
Dependent Claim
38 words
A composition according to claim 22 wherein said perchloric acid is present at a level in the range of about 2 to 5% based on a precursor aqueous solution in a concentration of about 45 to about 72%.
Claim 27
Dependent Claim
36 words
A composition according to claim 22 wherein said resinous compound has additionally present and distributed relatively uniformly throughout same sand and at least one member selected from the group consisting of phosphoric acid and boric acid.
Claim 28
Dependent Claim
25 words
A composition according to claim 24 wherein small amounts of both phosphoric acid and boric acid are present and distributed relatively uniformly throughout said resin.
Claim 29
Dependent Claim
13 words
A composition according to claim 25 wherein said resin is a cured furan.
Claim 30
Dependent Claim
15 words
A composition according to claim 24 wherein said member of said group is phosphoric acid.
Claim 31
Dependent Claim
15 words
A composition according to claim 24 wherein both phosphoric acid and boric acid are present.
Claim 32
Dependent Claim
24 words
A composition according to claim 27 wherein said phosphoric acid is present in an amount in the range of about 1 to about 10%.
Claim 33
Dependent Claim
53 words
A composition according to claim 28 wherein said phosphoric acid is present in an amount in the range of about 2 to about 3.5% based on perchloric acid catalyst precursor composition and said boric acid is present in the range of about 1.5% to about 3.5% based on perchloric acid catalyst precursor composition.
Claim 34
Dependent Claim
50 words
A composition according to claim 28 wherein said phosphoric acid is present in an amount in the range of about 2% to about 3.5% based on perchloric acid catalyst precursor composition and said boric acid is present in the range of about 1/2% to about 1% based on the sand.
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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) | 1982-12-10 | 1983-06-11 | 1983-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-10 | 1987-06-11 | 1987-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-10 | 1991-06-11 | 1991-12-11 | $7700.00 | Window Closed / Lapsed |