US5206279A
Expired / Lapsed
US
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Method of preparing aqueous dispersions of ethylene/α,β-unsaturated carboxylic acid interpolymers
Assignee: Dow Chemical Co
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Filing: 1991-01-25
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Granted: 1993-04-27
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Expires: 2011-01-25
Abstract
Abstract Aqueous dispersions of ethylene/ alpha , beta -unsaturated carboxylic acid interpolymers (e.g., random ethylene/acrylic acid interpolymers) are formed using a mixture of bases at a concentration of at least about 0.2 equivalents of base per mole of alpha , beta -unsaturated carboxylic acid. The dispersions have at least about 10 weight percent dispersed solids and not more than about 1 weight percent of the initial polymer in non-dispersed form. Preferred bases for use in forming the dispersions are ammonium hydroxide and/or alkali metal hydroxides. A mixture of ammonium hydroxide and potassium hydroxide is especially preferred for forming the dispersions with ethylene/acrylic acid interpolymers at an ammonium hydroxide:acrylic acid molar ratio of about 1:1 and a potassium hydroxide:acrylic acid molar ratio in the range of about 0.6-0.8:1. The dispersions are particularly useful in forming thin coatings of adhesive on substrates, such as paper and metal foil, using conventional techniques.
Inventors
- 👤 Michael E. Rowland
- 👤 Kenneth E. Springs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:52
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/44
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
123 words
In a method of forming an aqueous dispersion of at least one ethylene/α,β-unsaturated carboxylic acid interpolymer comprising contacting the interpolymer(s) in a stirred aqueous medium with a mixture of bases, the improvement characterized by contacting the interpolymer with at least about 0.2 equivalents of base per mole of α,β-unsaturated carboxylic acid, said base being a mixture of monoethanolamine, diethanolamine or ammonium hydroxide and at least one alkali metal hydroxide in a ratio of from about 1.5 to about 3 moles of ammonium hydroxide per mole of alkali metal hydroxide, thereby forming a dispersion having at least about 10 weight percent of dispersed solids, total weight basis at not more than about 1 weight percent of non-dispersibles, based on the weight of the interpolymer.
Claim 2
Dependent Claim
123 words
In a method of forming an aqueous dispersion of at least one ethylene/α,β-unsaturated carboxylic acid interpolymer comprising contacting the interpolymer(s) in a stirred aqueous medium with a mixture of bases, the improvement characterized by contacting the interpolymer with at least about 0.2 equivalents of base per mole of α,β-unsaturated carboxylic acid, said base being a mixture of monoethanolamine, diethanolamine or ammonium hydroxide and at least one alkali metal hydroxide in a ratio of from about 1.5 to about 3 moles of ammonium hydroxide per mole of alkali metal hydroxide, thereby forming a dispersion having at least about 10 weight percent of dispersed solids, total weight basis at not more than about 1 weight percent of non-dispersibles, based on the weight of the interpolymer.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein the solids content of the dispersion is at least about 25 weight percent, total weight basis.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein the mixture of base is a mixture of ammonium hydroxide and at least one alkali met hydroxide.
Claim 5
Dependent Claim
18 words
The method of claim 3 wherein the alkali metal hydroxide is lithium hydroxide, potassium hydroxide or sodium hydroxide.
Claim 6
Dependent Claim
14 words
The method of claim 4 wherein the mixture is ammonium hydroxide and potassium hydroxide.
Claim 7
Dependent Claim
16 words
The method of claim 5 wherein the ethylene/α,β-unsaturated carboxylic acid interpolymer is an ethylene/acrylic acid interpolymer.
Claim 8
Dependent Claim
26 words
The method of claim 6 wherein the mixture of ammonium hydroxide and potassium hydroxide is at a total ratio of from about 1.5:1 to about 3:1.
Claim 9
Dependent Claim
26 words
The method of claim 7 wherein the ammonium hydroxide:acrylic acid molar ratio is about 1:1 and the potassium hydroxide:acrylic acid molar ratio is from about 0.6-0.8:1.
Claim 10
Dependent Claim
19 words
The method of claim 1 wherein the aqueous medium additionally contains an alcohol of 1 to 4 carbon atoms.
Claim 11
Dependent Claim
10 words
An aqueous dispersion produced by the method of claim 1.
Claim 12
Dependent Claim
8 words
Film produced from the dispersion of claim 10.
Claim 13
Dependent Claim
31 words
The method of claim 1 wherein the ratio of ammonium hydroxide:α,β-unsaturated carboxylic acid molar ratio is about 1:1 and the alkali metal hydroxide:α,β-unsaturated carboxylic acid molar ratio is from about 0.6-0.8:1.
Claim 14
Dependent Claim
49 words
The method of claim 1 wherein said interpolymer is contacted sequentially first with one of the alkali metal hydroxides, either in an aqueous or non-aqueous environment, and then contacted with ammonium hydroxide or a mixture of ammonium hydroxide and another of the alkali metal hydroxides in an aqueous medium.
Claim 15
Dependent Claim
16 words
The method of claim 1 wherein the ethylene/α,β-unsaturated carboxylic acid interpolymer is an ethylene/acrylic acid interpolymer.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1996-04-26 | 1996-10-26 | 1997-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-26 | 2000-10-26 | 2001-04-27 | $3760.00 | Window Closed / Lapsed |
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