US4192923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amino resin foam, one-phase solution foam precursor and method of producing foam
Assignee: Honeywell International Inc
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Filing: 1978-10-27
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Granted: 1980-03-11
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Expires: 1998-10-27
Abstract
Abstract Amino resin foams of the urea-formaldehyde or urea-melamine-formaldehyde type formed from a one-phase solution of methylene chloride solvent, propylene glycol co-solvent, catalyst and polymer precursors which may be urea and formaldehyde or urea, melamine and formaldehyde. As reaction occurs between the polymer precursors in the solution, the methylene chloride in the solution vaporizes foaming the resin. In the product foam, the propylene glycol acts as a plasticizer and the methylene chloride as the blowing agent in a closed-cell foam having superior stability and insulative properties. The product foam is useful in building insulation and for other insulative purposes.
Inventors
- 👤 Edward G. Tajkowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:26
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/143; C08J9/144; C08J9/145; C08J9/0014; C08J9/0023; C08K; C08K5/00; C08K5/04; C08K5/05; C08J2361/00; C08J2361/20; Y; Y10; Y10S; Y10S521/00; Y10S521/913
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
131 words
A one-phase solution capable of exothermic reaction to form an amino resin foam consisting essentially of: (a) from about 2 to about 20% by methylene chloride by weight of resin solids; (b) from about 10 to about 40% propylene glycol by weight of resin solids; (c) from about 30 to about 56% formaldehyde by weight of resin solids; (d) from about 35 to about 59% by weight urea by weight of resin solids; (e) from 0 to about 14% melamine by weight of resin solids; (f) from 0 to about 25% water by weight of composition; and (g) an acidic catalyst which promotes the reaction of urea and formaldehyde and which is soluble in said solution in an amount sufficient to lower the pH of the solution to below about 3.
Claim 2
Dependent Claim
131 words
A one-phase solution capable of exothermic reaction to form an amino resin foam consisting essentially of: (a) from about 2 to about 20% by methylene chloride by weight of resin solids; (b) from about 10 to about 40% propylene glycol by weight of resin solids; (c) from about 30 to about 56% formaldehyde by weight of resin solids; (d) from about 35 to about 59% by weight urea by weight of resin solids; (e) from 0 to about 14% melamine by weight of resin solids; (f) from 0 to about 25% water by weight of composition; and (g) an acidic catalyst which promotes the reaction of urea and formaldehyde and which is soluble in said solution in an amount sufficient to lower the pH of the solution to below about 3.
Claim 3
Dependent Claim
22 words
The one-phase solution of claim 1 containing between about 15% and about 25% of melamine by combined weight of urea and melamine.
Claim 4
Dependent Claim
13 words
The one-phase solution of claim 1 wherein said catalyst is an organic acid.
Claim 5
Dependent Claim
13 words
The one-phase solution of claim 1 wherein said catalyst is toluene sulfonic acid.
Claim 6
Dependent Claim
11 words
The one-phase solution of claim 1 containing 0% by weight melamine.
Claim 7
Independent Claim
79 words
A method of forming an amino resin foam which comprises the steps of: (a) mixing a first composition of propylene glycol, urea and formaldehyde with additional urea, methylene chloride and a catalyst which promotes the reaction of urea and formaldehyde, in proportions giving a one-phase solution; (b) reacting the urea and formaldehyde in the one-phase solution to form a resin by an exothermic reaction; and (c) foaming said resin by the vaporization of methylene chloride in the one-phase solution.
Claim 8
Independent Claim
79 words
A method of forming an amino resin foam which comprises the steps of: (a) mixing a first composition of propylene glycol, urea and formaldehyde with additional urea, methylene chloride and a catalyst which promotes the reaction of urea and formaldehyde, in proportions giving a one-phase solution; (b) reacting the urea and formaldehyde in the one-phase solution to form a resin by an exothermic reaction; and (c) foaming said resin by the vaporization of methylene chloride in the one-phase solution.
Claim 9
Dependent Claim
19 words
The method of claim 6 wherein said methylene chloride is dissolved as a second composition in additional propylene glycol.
Claim 10
Dependent Claim
21 words
The method of claim 6 wherein said methylene chloride and catalyst are dissolved as a second composition in additional propylene glycol.
Claim 11
Dependent Claim
20 words
The method of claim 6 wherein said first composition is is pre-mixed by combining a urea-formaldehyde concentrate and propylene glycol.
Claim 12
Dependent Claim
12 words
The method of claim 6 wherein said first composition also contains melamine.
Claim 13
Dependent Claim
19 words
The method of claim 10 wherein said first composition is pre-mixed by dissolving a urea-melamine-formaldehyde concentrate in propylene glycol.
Claim 14
Dependent Claim
84 words
The method of claim 11 wherein said urea-melamine-formaldehyde concentrate contains: (1) from about 15 to about 25 weight percent urea, (2) from about 30 to about 70 weight percent formaldehyde, (3) from about 4.0 to about 20 weight percent melamine, (4) from about 10 to about 25 weight percent water, and (5) from about 0.05 to about 4.0 weight percent of a stabilizer which is a buffering agent which maintains the pH of the concentrate within the range from about 4.0 to about 7.5.
Claim 15
Dependent Claim
18 words
The method of claim 11 wherein methylene chloride is dissolved as a second composition in additional propylene glycol.
Claim 16
Dependent Claim
20 words
The method of claim 11 wherein methylene chloride and catalyst are dissolved as a second composition in additional propylene glycol.
References Cited (Backward Citations)
US3793161A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-11 | 1983-09-10 | 1984-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-11 | 1987-09-10 | 1988-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-11 | 1991-09-10 | 1992-03-11 | $7700.00 | Window Closed / Lapsed |