US4499200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compound catalyst system usable for the polymerization or curing of urea-formaldehyde polymeric condensation systems
Assignee: Chem Nuclear Systems LLC
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Filing: 1983-11-14
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Granted: 1985-02-12
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Expires: 2003-11-14
Abstract
Abstract Using a buffered acid catalyst, a cross-linked urea-formaldehyde polymer matrix is formed by catalyzing an aqueous mixture of an urea-formaldehyde concentrate, urea-formaldehyde resin, and powdered urea. The resulting thermoset polymer which possesses, in part, a cyclic structure, is of unusual hardness and has utility, with or without fillers, as a molding or casting material possessing controllable shrinkage characteristics because of uniform molecular structure and formula versatility. The catalyst system may be used for the polymerization or cure of other urea-formaldehyde or polymeric condensation systems.
Inventors
- 👤 John E. Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:03
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/10; C08G12/12; C08L; C08L61/00; C08L61/20; C08L61/22; C08L61/24
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
28 words
A catalyst system useful for promoting the polymerization or reaction of thermosetting resins comprising; (a) phosphoric acid, (b) trisodium phosphate, (c) boric acid, (d) glycerol, and (e) water.
Claim 2
Dependent Claim
28 words
A catalyst system useful for promoting the polymerization or reaction of thermosetting resins comprising; (a) phosphoric acid, (b) trisodium phosphate, (c) boric acid, (d) glycerol, and (e) water.
Claim 3
Dependent Claim
32 words
The system of claim 1, which comprises two components: (a) the first component comprising said phosphoric acid, trisodium phosphate, and water, and (b) the second component comprising said boric acid and glycerol.
Claim 4
Dependent Claim
27 words
The system of claim 2, wherein the first component comprises 100 parts of 75 percent phosphoric acid, 100 parts of trisodium phosphate and 50 parts of water.
Claim 5
Dependent Claim
25 words
The system of claim 3 wherein up to one percent boric acid and up to three percent glycerol are also added to the catalyst system.
Claim 6
Dependent Claim
17 words
The system of claim 2, wherein the second component comprises equal amounts of boric acid and glycerol.
Claim 7
Dependent Claim
47 words
The system of claim 2, comprising said two components in a ratio of about 1:1.5; wherein said first component comprises said phosphoric acid, trisodium phosphate, and water in a ratio of 2:2:1; and said second component comprises said boric acid and glycerol in a ratio of 1:1.
Claim 8
Dependent Claim
33 words
The system of claim 2, wherein said second component is formed in situ in a casting liquid comprising the thermosetting resin to be polymerized or reacted prior to addition of said first component.
Claim 9
Independent Claim
80 words
A method of making a catalyst system useful for promoting the polymerization or reaction of thermosetting resins comprising: (a) phosphoric acid, (b) trisodium phosphate, (c) boric acid, (d) glycerol, and (e) water, said method comprising: (f) making a solution of said phospheric acid and said trisodium phosphate in said water, (g) adding said boric acid and said glycerol to a casting liquid comprising the thermosetting resin to be polymerized or reacted, and (h) adding said solution to said casting liquid.
Claim 10
Independent Claim
80 words
A method of making a catalyst system useful for promoting the polymerization or reaction of thermosetting resins comprising: (a) phosphoric acid, (b) trisodium phosphate, (c) boric acid, (d) glycerol, and (e) water, said method comprising: (f) making a solution of said phospheric acid and said trisodium phosphate in said water, (g) adding said boric acid and said glycerol to a casting liquid comprising the thermosetting resin to be polymerized or reacted, and (h) adding said solution to said casting liquid.
Claim 11
Dependent Claim
22 words
The method of claim 8, wherein said solution comprises 75 percent phosphoric acid, trisodium phosphate, and water in a ratio of 2:2:1.
Claim 12
Dependent Claim
17 words
The method of claim 8, wherein the ratio of said boric acid to said glycerol is 1:1.
Claim 13
Dependent Claim
69 words
The method of claim 8, comprising: (a) making a solution 75 percent phospheric acid, trisodium phosphate, and water in a ratio of 2:2:1, (b) adding said boric acid and said glycerol in a ratio of 1:1 to said casting liquid, and (c) adding said solution to said casting liquid, (d) the amounts of the ingredients being chosen such that the ratio of boric acid, glycerol, and solution is 0.5:0.5:1.5.
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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) | 1988-02-12 | 1988-08-13 | 1989-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-12 | 1992-08-13 | 1993-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-12 | 1996-08-13 | 1997-02-12 | $7700.00 | Window Closed / Lapsed |