US4366264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of calcium metasilicate (wollastonite) as a formaldehyde suppressant for urea formaldehyde resins
Assignee: WAWZONEK MARIAN
•
Filing: 1982-04-16
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Granted: 1982-12-28
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Expires: 2002-04-16
Abstract
Abstract Formaldehyde suppression is accomplished in urea formaldehyde foamed insulation by adding, prior to the foaming, a small but effective amount of a formaldehyde off-gassing suppressant, which is calcium metasilicate.
Inventors
- 👤 Stanley Wawzonek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:40
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C08K; C08K3/00; C08K3/34; C08J2361/00; C08J2361/20; C08J2361/22; C08J2361/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
55 words
A urea-formaldehyde foamed insulation composition prepared from a first and second component, said first component comprising an aqueous solution of a foaming agent and said second component comprising an aqueous solution of a pre-condensate urea-formaldehyde resin, said second component containing as a formaldehyde decomposition suppressant, a small but suppression effective amount of a calcium metasilicate.
Claim 2
Dependent Claim
55 words
A urea-formaldehyde foamed insulation composition prepared from a first and second component, said first component comprising an aqueous solution of a foaming agent and said second component comprising an aqueous solution of a pre-condensate urea-formaldehyde resin, said second component containing as a formaldehyde decomposition suppressant, a small but suppression effective amount of a calcium metasilicate.
Claim 3
Dependent Claim
35 words
The foamed insulation product of claim 1 wherein the amount of said calcium metasilicate in said pre-condensate resin is from about 15 grams per gallon of resin to about 125 grams per gallon of resin.
Claim 4
Dependent Claim
31 words
The foamed insulation of claim 2 wherein the amount of said calcium metal silicate is from about 30 grams per gallon of resin to about 120 grams per gallon of resin.
Claim 5
Dependent Claim
31 words
The foamed insulation of claim 3 wherein the amount of said calcium metal silicate is from about 60 grams per gallon of resin to about 120 grams per gallon of resin.
Claim 6
Dependent Claim
25 words
The foamed insulation of claim 1 wherein the particle size of said calcium metasilicate is from about 2% retained on a 200 mesh standard sieve.
Claim 7
Independent Claim
62 words
A method of decreasing formaldehyde outgassing from urea-formaldehyde foamed insulation prepared from a first and second component, said first component comprising an aqueous solution of a foaming agent and said second component comprising an aqueous solution of a pre-condensate urea-formaldehyde resin, comprising: adding to said second component as a formaldehyde emission suppressant a small but effective amount of divided, particulate calcium metasilicate.
Claim 8
Independent Claim
62 words
A method of decreasing formaldehyde outgassing from urea-formaldehyde foamed insulation prepared from a first and second component, said first component comprising an aqueous solution of a foaming agent and said second component comprising an aqueous solution of a pre-condensate urea-formaldehyde resin, comprising: adding to said second component as a formaldehyde emission suppressant a small but effective amount of divided, particulate calcium metasilicate.
Claim 9
Dependent Claim
17 words
The method of claim 6 wherein said calcium metasilicate is substantially uniformly dispersed through said resin component.
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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) | 1985-12-27 | 1986-06-28 | 1986-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-27 | 1990-06-28 | 1990-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-27 | 1994-06-28 | 1994-12-28 | $7700.00 | Window Closed / Lapsed |