US4722965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chalk adhesion polymer composition and method of preparation
Assignee: Reichhold Chemicals Inc
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Filing: 1986-02-24
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Granted: 1988-02-02
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Expires: 2006-02-24
Abstract
Abstract A chalk-adhesion polymer latex for exterior coatings especially suitable for blending with an acrylic formulation, such as vinyl acetate/ acrylic copolymers. The polymer is derived from a monomer precursor composition, including an acrylic moiety, such as an acrylate and a methacrylate, together with small amounts of a nitrogen-containing alkyl acrylate, an acrylamide and propylene glycol. The method of preparing the chalk adhesion polymer includes emulsification stages to accomplish the polymerization.
Inventors
- 👤 Kian C. Wong
- 👤 Patrick J. McDonald
- 👤 Stanley J. Gromelski, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:49
CPC Classifications
C; C09; C09D; C09D133/00; C09D133/04; C09D133/06; C09D133/062; C08; C08L; C08L33/00; C08L33/04; C08L33/06
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
91 words
An aqueous chalk adhesion latex coating composition consisting essentially of: (a) about 10 to 30% of an aqueous polymer dispersion comprising: (i) major amounts of an acrylic moiety selected from the group consisting of an alkyl acrylate, an alkyl methacrylate, and mixtures thereof, and (ii) minor, but effective amounts of a secondary amine containing alkyl acrylate and an acrylamide; and (b) the remainder comprising a vinyl-acrylic or all acrylic formulation; wherein said composition exhibits chalk adhesion properties of about 1 to 30% film removed after one week, and excellent blister resistance.
Claim 2
Dependent Claim
91 words
An aqueous chalk adhesion latex coating composition consisting essentially of: (a) about 10 to 30% of an aqueous polymer dispersion comprising: (i) major amounts of an acrylic moiety selected from the group consisting of an alkyl acrylate, an alkyl methacrylate, and mixtures thereof, and (ii) minor, but effective amounts of a secondary amine containing alkyl acrylate and an acrylamide; and (b) the remainder comprising a vinyl-acrylic or all acrylic formulation; wherein said composition exhibits chalk adhesion properties of about 1 to 30% film removed after one week, and excellent blister resistance.
Claim 3
Dependent Claim
19 words
The composition of claim 1, wherein the acrylic moiety comprises, in combination, butyl acrylate, methyl methacrylate, and 2-ethylhexyl acrylate.
Claim 4
Dependent Claim
35 words
The composition of claim 1, wherein the secondary amine-containing alkyl acrylate is selected from the group consisting of dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, t-butylaminoethyl methacrylate, an allylic monomer containing amino and ureido functionality and mixtures thereof.
Claim 5
Dependent Claim
15 words
The composition of claim 3, wherein the secondary amine containing alkyl acrylate is dimethylaminoethyl methacrylate.
Claim 6
Dependent Claim
26 words
The composition of claim 1, wherein the acrylamide is selected from the group consisting of N-methylol acrylamide, methyl acrylamidoglycolate methyl ether, N,N-dimethyl acrylamide, and mixtures thereof.
Claim 7
Dependent Claim
11 words
The composition of claim 5, wherein the acrylamide is N-methylol acrylamide.
Claim 8
Dependent Claim
18 words
The composition of claim 1, wherein the acrylic moiety comprises more than 90% by weight of the copolymer.
Claim 9
Dependent Claim
38 words
The composition of claim 1, wherein the precursor for the aqueous polymer dispersion comprises, in weight %, about 40-80% butyl acrylate, about 5-40% methyl methacrylate, about 5-40% 2-ethylhexyl acrylate, about 0.5-5% dimethylaminoethyl methacrylate and about 0.5-5% N-methylol acrylamide.
Claim 10
Independent Claim
170 words
A method for preparing an aqueous chalk adhesion polymer capable of penetrating a chalky coating and adhering to the surface beneath said chalky coating which comprises: (a) forming a monomer composition consisting essentially of about 40 to 80 weight % butyl acrylate, about 5 to 40 weight % methyl methacrylate, about 5 to 40 weight % 2-ethyl-hexyl acrylate, about 0.5 to 5 weight % dimethylaminoethyl methacrylate and about 0.5 to 5 weight % N-methylol acrylamide; (b) pre-emulsifying the components of step (a) to form an aqueous monomer pre-emulsion; (c) charging about 3 to 10% of the monomer pre-emulsion to a reactor to initiate the reaction at a temperature below about 80° C.; (d) slowly adding the remaining portion of the monomer pre-emulsion to the reactor at a temperature below about 80° C. until the reaction is completed to form said chalk adhesion polymer in aqueous dispersion; (e) wherein said chalk adhesion polymer exhibits chalk adhesion properties of about 1 to 30% film removed after 1 week, and excellent blister resistance.
Claim 11
Independent Claim
170 words
A method for preparing an aqueous chalk adhesion polymer capable of penetrating a chalky coating and adhering to the surface beneath said chalky coating which comprises: (a) forming a monomer composition consisting essentially of about 40 to 80 weight % butyl acrylate, about 5 to 40 weight % methyl methacrylate, about 5 to 40 weight % 2-ethyl-hexyl acrylate, about 0.5 to 5 weight % dimethylaminoethyl methacrylate and about 0.5 to 5 weight % N-methylol acrylamide; (b) pre-emulsifying the components of step (a) to form an aqueous monomer pre-emulsion; (c) charging about 3 to 10% of the monomer pre-emulsion to a reactor to initiate the reaction at a temperature below about 80° C.; (d) slowly adding the remaining portion of the monomer pre-emulsion to the reactor at a temperature below about 80° C. until the reaction is completed to form said chalk adhesion polymer in aqueous dispersion; (e) wherein said chalk adhesion polymer exhibits chalk adhesion properties of about 1 to 30% film removed after 1 week, and excellent blister resistance.
Claim 12
Dependent Claim
34 words
The method of claim 9, wherein the chalk adhesion polymer is blended with an acrylic formulation to form a chalk adhesion latex coating composition comprising about 10-30% by weight of the chalk adhesion polymer.
Claim 13
Dependent Claim
37 words
The method of claim 9, wherein the monomer composition of step (a) comprises in weight % about 40-60% butyl acrylate, about 10-30% methyl methacrylate, about 5-20% 2-ethylhexyl acrylate, about 0.5-5% dimethylamino-ethyl methacrylate, and about 0.5-5% N-methylol acrylamide.
Claim 14
Dependent Claim
21 words
The method of claim 9, wherein the monomer is emulsified in the presence of about 0.5-5% by weight of a glycol.
Claim 15
Dependent Claim
28 words
The method of claim 12, wherein the glycol is selected from the group consisting of propylene glycol, butylene glycol, dipropylene glycol, diethylene glycol, 1,4-budanediol, 1,2-propanediol and ethylene glycol.
Claim 16
Dependent Claim
26 words
The method of claim 9, wherein the monomer pre-emulsion of step (b) is charged to the reactor over a period of about 3 to 6 hours.
Claim 17
Dependent Claim
9 words
The product formed by the method of claim 9.
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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) | 1991-02-01 | 1991-08-03 | 1992-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-01 | 1995-08-03 | 1996-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-01 | 1999-08-03 | 2000-02-02 | $7700.00 | Window Closed / Lapsed |