US4735981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combinations of associative thickeners and aqueous latex paints containing the same
Assignee: Union Carbide Corp
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Filing: 1986-10-03
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Granted: 1988-04-05
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Expires: 2006-10-03
Abstract
Abstract Alkaline aqueous latex paints are disclosed which have a pH of at least about 7.5 and contain an effective amount of a combination of thickeners constituted by: (I) a urethane polymer having at least three hydrophobic groups, at least two of which are terminal hydrophobic groups, the hydrophobic groups being linked by hydrophilic groups: and (II) an alkali-soluble aqueous emulsion copolymer of: (A) about 20-70 weight percent of an alpha, beta-monoethylenically unsaturated carboxylic acid, typically methacrylic acid; (B) about 20-80 weight percent of a monoethylenically unsaturated monomer lacking surfactant capacity, typically ethyl acrylate; (C) about 0.5-60 weight percent of a nonionic urethane monomer which is the urethane reaction product of a monohydric nonionic surfactant with a monoethylenically unsaturated monoisocyanate; and (D) from 0 up to about 2 weight percent of a polyethylenically unsaturated monomer. Semi gloss paints based on copolymers of at least 55% vinyl acetate are preferred, and the paints are desirably buffered with alkaline agent and/or a polycarboxylic acid electrolyte.
Inventors
- 👤 Arthur F. Rich
- 👤 Philip C. Benes
- 👤 Linus E. Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:34
CPC Classifications
C; C09; C09D; C09D175/00; C09D175/04; C09D175/08; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C09D131/00; C09D131/02; C09D131/04; C09D7/00; C09D7/40; C09D7/43; C09D7/44; C08L; C08L33/00; C08L33/02; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
149 words
An alkaline aqueous latex paint having a high shear viscosity of from 0.1-3.5 poise and a low shear viscosity of from 400-1600 poise and having a pH of at least about 7.5 and having its rheology controlled by an effective amount of a combination of thickeners constituted by: (I) a urethane polymer having at least three hydrophobic groups, at least two of which are terminal hydrophobic groups, the hydrophobic groups being linked by hydrophilic groups; and (II) an alkali-soluble aqueous emulsion copolymer of: (A) about 20-70 weight percent of an alpha, beta-monoethylenically unsaturated carboxylic acid; (B) about 20-80 weight percent of a monoethylenically unsaturated monomer lacking surfactant capacity; (C) about 0.5-60 weight percent of a nonionic urethane monomer which is the urethane reaction product of a monohydric nonionic surfactant with a monoethylenically unsaturated monoisocyanate; and (D) from 0 up to about 2 weight percent of a polyethylenically unsaturated monomer.
Claim 2
Dependent Claim
149 words
An alkaline aqueous latex paint having a high shear viscosity of from 0.1-3.5 poise and a low shear viscosity of from 400-1600 poise and having a pH of at least about 7.5 and having its rheology controlled by an effective amount of a combination of thickeners constituted by: (I) a urethane polymer having at least three hydrophobic groups, at least two of which are terminal hydrophobic groups, the hydrophobic groups being linked by hydrophilic groups; and (II) an alkali-soluble aqueous emulsion copolymer of: (A) about 20-70 weight percent of an alpha, beta-monoethylenically unsaturated carboxylic acid; (B) about 20-80 weight percent of a monoethylenically unsaturated monomer lacking surfactant capacity; (C) about 0.5-60 weight percent of a nonionic urethane monomer which is the urethane reaction product of a monohydric nonionic surfactant with a monoethylenically unsaturated monoisocyanate; and (D) from 0 up to about 2 weight percent of a polyethylenically unsaturated monomer.
Claim 3
Dependent Claim
18 words
A paint as recited in claim 1 in which said nonionic urethane monomer is alpha, alpha-dimethyl-m-isopropenyl benzyl isocyanate.
Claim 4
Dependent Claim
41 words
A paint as recited in claim 1 in which said hydrophobic groups of said urethane polymer contain at least about 20 carbon atoms and are linked together by water-soluble polyether segments each having a molecular weight of at least about 1,500.
Claim 5
Dependent Claim
23 words
A paint as recited in claim 3 in which said polyether segments are polyethylene oxide segments which have been joined by organic diisocyanate.
Claim 6
Dependent Claim
24 words
A paint as recited in claim 4 in which said polyethylene oxide segments are terminated with alkyl groups which contain from 12-22 carbon atoms.
Claim 7
Dependent Claim
24 words
A paint as recited in claim 1 in which said emulsion copolymer component (A) is methacrylic acid and said component (B) is ethyl acrylate.
Claim 8
Dependent Claim
31 words
A paint as recited in claim 1 in which said urethane polymer is used in a weight ratio with respect to the carboxyl-functional emulsion copolymer of from about 60:40 to 10:90.
Claim 9
Dependent Claim
17 words
A paint as recited in claim 7 in which said weight ratio is from 50:50 to 20:80.
Claim 10
Dependent Claim
34 words
A paint as recited in claim 1 in which the binder of said aqueous emulsion paint is an aqueous emulsion copolymer of monoethylenically unsaturated monomers providing a glass transition temperature below about 20° C.
Claim 11
Dependent Claim
20 words
A paint as recited in claim 9 in which the glass transition temperature is from -10° C. to +10° C.
Claim 12
Dependent Claim
35 words
A paint as recited in claim 9 in which the copolymer comprises a copolymer of at least 55% vinyl acetate with enough acrylic acid or methacrylic acid esters to provide the desired glass transition temperature.
Claim 13
Dependent Claim
25 words
A paint as recited in claim 11 in which the copolymer comprises a copolymer of about 85% vinyl acetate balance consisting essentially of n-butyl acrylate.
Claim 14
Dependent Claim
22 words
A paint as recited in claim 1 in which said paint, when dry, exhibits a 60° gloss reading in excess of 10.
Claim 15
Dependent Claim
22 words
A paint as recited in claim 11 in which said paint, when dry, exhibits a 60° gloss reading in excess of 10.
Claim 16
Dependent Claim
24 words
A paint as recited in claim 1 in which said paint comprises at least about 8 pounds of 2-amino-2-methyl-1-propanol per 100 gallons of paint.
Claim 17
Dependent Claim
44 words
A paint as recited in claim 1 in which said paint is buffered with a buffering agent constituted by additional alkaline agent raising the pH above 7.5 or by a polycarboxylic acid neutralized to a pH of 6.5 to 8.5, or a mixture thereof.
Claim 18
Dependent Claim
33 words
A paint as recited in claim 1 in which said paint comprises at least about 2 pounds of 2-amino-2-methyl-1-propanol and at least 2 pounds of a polyelectrolyte disperspant per 100 gallons of paint.
Claim 19
Dependent Claim
30 words
A paint as recited in claim 17 in which said polyelectrolyte dispersant is a carboxyl-functional copolymer neutralized with an amine to a pH in the range of 6.5 to 8.5.
Claim 20
Dependent Claim
33 words
A paint as recited in claim 1 in which said paint comprises at least about 3 pounds of 2-amino-2-methyl-1-propanol and at least 4 pounds of a polyelectrolyte dispersant per 100 gallons of paint.
Claim 21
Dependent Claim
44 words
A paint as recited in claim 19 in which said polyelectrolyte dispersant is a copolymer of a major weight proportion of methacrylic acid with a minor weight proportion of ethyl acrylate neutralized with ammonia to a pH in the range of 6.5 to 8.5.
Claim 22
Dependent Claim
86 words
A paint as recited in claim 1 in which said aqueous emulsion copolymer is a copolymer of: (A) about 25-60 weight percent of an alpha, beta-monoethylenically unsaturated carboxylic acid; (B) about 20-55 weight percent of a monoethylenically unsaturated monomer lacking surfactant capacity; (C) about 20-40 weight percent of a nonionic urethane monomer which is the urethane reaction product of a monohydric nonionic surfactant with a monoethylenically unsaturated monoisocyanate, as previously described; and (D) from 0 up to about 2 weight percent of a polyethylenically unsaturated monomer.
Claim 23
Dependent Claim
58 words
A paint as recited in claim 8 buffered with a buffering agent constituted by additional alkaline agent raising the pH above 7.5 or by a polycarboxylic acid neutralized to a pH of 6.5 to 8.5, or a mixture thereof and having a high shear viscosity of from 1.5-2.4 poise and a low shear viscosity of from 500-1200 poise.
Claim 24
Dependent Claim
19 words
A paint as recited in claim 22 having a pH in the range of pH 8.0 to pH 9.5.
Claim 25
Dependent Claim
12 words
A paint as recited in claim 21 which is a semi-gloss paint.
References Cited (Backward Citations)
US4079028A
Cited
US4079028B1
Cited
US4122055A
Cited
US4442248A
Cited
US4507426A
Cited
US4514552A
Cited
US4600761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-05 | 1991-10-05 | 1992-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-05 | 1995-10-05 | 1996-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-05 | 1999-10-05 | 2000-04-05 | $7700.00 | Window Closed / Lapsed |