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US4043960A
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Aqueous dispersions of thermosetting hydroxy-functional formaldehyde copolymer resins derived from diaryl oxides, sulfides, dibenzofuran or dibenzothiophene
Assignee: Dow Chemical Co
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Filing: 1976-01-19
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Granted: 1977-08-23
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Expires: 1996-01-19
Abstract
Abstract Aqueous dispersions comprising: A. a thermosetting hydroxy-functional condensation copolymer, such as the copolymer of diphenyl oxide and formaldehyde; B. a curing amount of curing agent, such as acid-catalyzed hexamethoxymethylmelamine; and C. an aqueous polyvinyl alcohol, have good shelf stability.
Inventors
- 👤 Paul Joseph Kress
- 👤 Raymond A. Plepys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:38
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08J3/07; C08G; C08G16/00; C08G16/02; C08J2361/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31627; Y10T442/00; Y10T442/20; Y10T442/2475; Y10T442/2549; Y10T442/2566
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
145 words
An aqueous dispersion comprising: a. a thermosetting hydroxy-functional condensation copolymer having the repeating unit ##STR2## wherein R is independently an alkyl group of from 1 to about 10 carbon atoms or a halogen, Z is oxygen or sulfur, the dashed line is an optional chemical bond, the group represented by Z taken with the dashed line represents dibenzofuran and dibenzothiophene moieties, or mixtures thereof, n is 3-10, m is 0-2 and p and q are 0 or 1 with the proviso that the sum of p and q has an average value of 0.1-1 and there is an average of at least 1 hydroxymethyl group per polymer; b. a curing amount of curing agent selected from the group consisting of strong acids with a pKa of about 2.1 or less and acid-catalyzed hexamethoxymethylmelamine; and c. at least about a 1 weight percent aqueous polyvinyl alcohol.
Claim 2
Dependent Claim
145 words
An aqueous dispersion comprising: a. a thermosetting hydroxy-functional condensation copolymer having the repeating unit ##STR2## wherein R is independently an alkyl group of from 1 to about 10 carbon atoms or a halogen, Z is oxygen or sulfur, the dashed line is an optional chemical bond, the group represented by Z taken with the dashed line represents dibenzofuran and dibenzothiophene moieties, or mixtures thereof, n is 3-10, m is 0-2 and p and q are 0 or 1 with the proviso that the sum of p and q has an average value of 0.1-1 and there is an average of at least 1 hydroxymethyl group per polymer; b. a curing amount of curing agent selected from the group consisting of strong acids with a pKa of about 2.1 or less and acid-catalyzed hexamethoxymethylmelamine; and c. at least about a 1 weight percent aqueous polyvinyl alcohol.
Claim 3
Dependent Claim
15 words
The aqueous dispersion of claim 1 wherein (c) is about a 3 percent polyvinyl alcohol.
Claim 4
Dependent Claim
19 words
The aqueous dispersion of claim 2 wherein the polyvinyl alcohol is at least about 50 percent hydrolyzed polyvinyl acetate.
Claim 5
Dependent Claim
12 words
The aqueous dispersion of claim 2 wherein Z of (a) is oxygen.
Claim 6
Dependent Claim
14 words
The aqueous dispersion of claim 4 wherein the dashed line of (a) is absent.
Claim 7
Dependent Claim
16 words
The aqueous dispersion of claim 5 wherein each R of (a) is a branched, lower alkyl.
Claim 8
Dependent Claim
13 words
The aqueous dispersion of claim 5 wherein each m of (a) is zero.
Claim 9
Dependent Claim
15 words
The aqueous dispersion of claim 7 wherein the curing agent of (b) is acid-catalyzed hexamethoxymethylmelamine.
Claim 10
Dependent Claim
15 words
The aqueous dispersion of claim 8 wherein the hexamethoxymethylmelamine is catalyzed by a latent acid.
Claim 11
Dependent Claim
17 words
The aqueous dispersion of claim 9 wherein the latent acid is diammonium hydrogen phosphate or ammonium persulfate.
Claim 12
Dependent Claim
23 words
The aqueous dispersion of claim 10 wherein the latent acid catalyst is present in an amount of at least about 2 weight percent.
Claim 13
Dependent Claim
22 words
The aqueous dispersion of claim 10 wherein the acid catalyst is present in an amount of at least about 10 weight percent.
References Cited (Backward Citations)
US3914194A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |