US4415683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxyethyl hydroxypropyl cellulose ether thickeners for aqueous coating compositions
Assignee: Dow Chemical Co
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Filing: 1982-03-26
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Granted: 1983-11-15
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Expires: 2002-03-26
Abstract
Abstract Aqueous coating compositions are disclosed employing as a thickener an HEHPC ether having a haze point of at least about 70° C., a gel point below 100° C., a total molar substitution of about 2.5 to about 4.0 and having a ratio of hydroxypropyl molar substitution to hydroxyethyl molar substitution of about 1:2 to 2:1. The HEHPC thickeners as described exhibit good resistance to bacterial degradation, good color development and a haze point sufficiently high to allow normal formulation of the coating composition.
Inventors
- 👤 John M. Kernstock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:39
CPC Classifications
C; C09; C09D; C09D101/00; C09D101/08; C09D101/26; C09D101/28; C09D101/284; C08; C08B; C08B11/00; C08B11/193; C09D157/00; C09D7/00; C09D7/40; C09D7/43; C08L; C08L1/00; C08L1/08; C08L1/26; C08L1/28; C08L1/284
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
81 words
An aqueous coating composition comprising (a) an aqueous dispersion of finely divided, water-insoluble polymer particles, (b) a pigment and (c) a hydroxyethyl hydroxypropyl cellulose ether having a thermal haze point of at least about 70° C., a gel point below 100° C., a total molar substitution of about 2.5 to 4.0 and a ratio of hydroxypropyl molar substitution to hydroxyethyl molar substitution of about 1:2 to 2:1 in an amount sufficient to impart the desired viscosity to said aqueous coating composition.
Claim 2
Dependent Claim
81 words
An aqueous coating composition comprising (a) an aqueous dispersion of finely divided, water-insoluble polymer particles, (b) a pigment and (c) a hydroxyethyl hydroxypropyl cellulose ether having a thermal haze point of at least about 70° C., a gel point below 100° C., a total molar substitution of about 2.5 to 4.0 and a ratio of hydroxypropyl molar substitution to hydroxyethyl molar substitution of about 1:2 to 2:1 in an amount sufficient to impart the desired viscosity to said aqueous coating composition.
Claim 3
Dependent Claim
19 words
The composition of claim 1 wherein said cellulose ether has a total molar substitution of about at least 3.5.
Claim 4
Dependent Claim
33 words
The composition of claim 1 wherein the cellulose ether is employed in an amount in the range of from about 0.1 to about 3.0 percent of the total weight of the coating composition.
Claim 5
Dependent Claim
19 words
The composition of claim 1 wherein the cellulose ether has an HPMS/HEMS ratio of about 1:2 to about 1:1.
Claim 6
Dependent Claim
22 words
The composition of claim 1 wherein the cellulose ether has a 2 percent aqueous solution viscosity of about 50 to 250,000 cps.
Claim 7
Dependent Claim
15 words
The composition of claim 1 wherein the polymer of said aqueous dispersion is a polyacrylate.
Claim 8
Dependent Claim
16 words
The composition of claim 1 wherein the polymer of said aqueous dispersion is a styrene/butadiene copolymer.
Claim 9
Dependent Claim
16 words
The composition of claim 1 wherein the polymer of said aqueous dispersion if a polyvinyl acetate.
Claim 10
Dependent Claim
23 words
The composition of claim 1 wherein the polymer of said aqueous dispersion is a copolymer of vinylacetate and vinyl halide or vinylidene halide.
Claim 11
Dependent Claim
28 words
The composition of claim 1 wherein the polymer of said aqueous dispersion is a copolymer of a vinyl halide or vinylidene halide and acrylic acid or methacrylic acid.
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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) | 1986-11-14 | 1987-05-16 | 1987-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-14 | 1991-05-16 | 1991-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-14 | 1995-05-16 | 1995-11-15 | $7700.00 | Window Closed / Lapsed |