US4171407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making aqueous emulsions of acrylate copolymers in the presence of a degraded starch protective colloid
Assignee: Roehm GmbH Darmstadt
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Filing: 1977-12-15
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Granted: 1979-10-16
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Expires: 1997-12-15
Abstract
Abstract Non-blocking coatings are disclosed, which coatings comprise an acrylate ester emulsion polymer prepared by polymerization in the presence of a degraded starch which, in a 10 percent solution in 1 N NaOH, has a viscosity not greater than 15 mPa . s at a velocity gradient D=532.1 s -1 .
Inventors
- 👤 Wilhelm Elser
- 👤 Klaus Huebner
- 👤 Hans Ottofrickenstein
- 👤 Hans Boessler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:15
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/36; D21H19/44; D21H19/56; D21H19/58; C; C09; C09D; C09D133/00; C09D133/04; C09D133/06; C09D133/062; C09D133/064; C08; C08L; C08L3/00; C08L3/02; Y; Y10; Y10S; Y10S526/00; Y10S526/91; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
179 words
The method of making an aqueous emulsion polymer having a minimum film-forming temperature below 50° C. and adaptable to use as a binder in coating agents forming non-blocking coatings, which method comprises emulsion polymerizing a monomer mixture comprising (A) 80 to 95.5 percent by weight of at least one acrylic acid alkyl ester, alone or in combination with a member selected from the group consisting of methacrylic acid alkyl esters and styrene, of which at least 30 percent by weight is an acrylic acid alkyl ester having 1 to 8 carbon atoms in the alkyl portion; (B) 0.5 to 5 percent by weight of an unsaturated polymerizable carboxylic acid or of a salt thereof; and (C) 0 to 19.5 percent by weight of other free-radically polymerizable monomers, in the presence of 1 to 5 percent, by weight of said monomers, of a protective colloid which is a degraded starch having a viscosity, in the form of a 10% solution in 1 N sodium hydroxide, of less than 15 mPa . s at a velocity gradient D=532.1 s -1 .
Claim 2
Independent Claim
179 words
The method of making an aqueous emulsion polymer having a minimum film-forming temperature below 50° C. and adaptable to use as a binder in coating agents forming non-blocking coatings, which method comprises emulsion polymerizing a monomer mixture comprising (A) 80 to 95.5 percent by weight of at least one acrylic acid alkyl ester, alone or in combination with a member selected from the group consisting of methacrylic acid alkyl esters and styrene, of which at least 30 percent by weight is an acrylic acid alkyl ester having 1 to 8 carbon atoms in the alkyl portion; (B) 0.5 to 5 percent by weight of an unsaturated polymerizable carboxylic acid or of a salt thereof; and (C) 0 to 19.5 percent by weight of other free-radically polymerizable monomers, in the presence of 1 to 5 percent, by weight of said monomers, of a protective colloid which is a degraded starch having a viscosity, in the form of a 10% solution in 1 N sodium hydroxide, of less than 15 mPa . s at a velocity gradient D=532.1 s -1 .
Claim 3
Dependent Claim
29 words
A method as in claim 1 wherein said polymerization proceeds in the presence of an anionic or cationic emulsifier and in the absence of non-ionic emulsifiers or surface-active agents.
Claim 4
Dependent Claim
11 words
An aqueous emulsion polymer prepared by the method of claim 1.
Claim 5
Dependent Claim
33 words
In a coating agent comprising a film-forming aqueous emulsion polymer in combination with conventional pigments and coating auxiliaries, the improvement wherein said film forming aqueous emulsion polymer is that according to claim 3.
Claim 6
Dependent Claim
31 words
The method of forming a non-blocking coating on a substrate which comprises applying thereto a coating agent comprising, as its binder component, a film-forming aqueous emulsion polymer as in claim 3.
References Cited (Backward Citations)
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US3513120A
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US3767604A
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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) | 1982-10-15 | 1983-04-16 | 1983-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-15 | 1987-04-16 | 1987-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-15 | 1991-04-16 | 1991-10-16 | $7700.00 | Window Closed / Lapsed |