US3950302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersible copolymer powder
Assignee: Hoechst AG
•
Filing: 1973-05-02
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Granted: 1976-04-13
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Expires: 1993-05-02
Abstract
Abstract A dispersible copolymer powder comprising vinyl ester, an acrylamide and optionally ethylene units is obtained by carying out the copolymerization reaction in an emulsifier-free aqueous medium and drying the emulsifier free aqueous dispersion of the copolymer in the absence of anti-caking agents. The copolymer powder has a very good storage stability and can be easily redispersed in water to give a dispersion having a high binder content.
Inventors
- 👤 Karl Josef Rauterkus
- 👤 Jan Blazek
- 👤 Wolfgang Zimmermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:41
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08F; C08F218/00; C08F218/02; C08F218/04; C08L; C08L31/00; C08L31/02; C08J2331/00; C08J2331/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
116 words
A dry readily dispersible emulsifier free and anti-caking agent free copolymer powder, consisting essentially of 50 to 92 weight percent vinyl ester, 0 to 45 weight percent of ethylene and 2 to 20 weight percent acrylamide of the formula CH 2 =CX--CO--NHY, wherein X is hydrogen or methyl, Y is hydrogen or CH 2 OZ, and Z is hydrogen, alkyl of 1 to 4 carbon atoms or acyl of 1 to 4 carbon atoms, obtained by emulsion copolymerizing, in an emulsifier-free aqueous medium, said vinyl ester; optionally ethylene; and said acrylamide and spray drying the resulting emulsifier free copolymerized product dispersion, in the absence of an anti-caking agent, to yield a free flowing dry copolymer powder.
Claim 2
Dependent Claim
116 words
A dry readily dispersible emulsifier free and anti-caking agent free copolymer powder, consisting essentially of 50 to 92 weight percent vinyl ester, 0 to 45 weight percent of ethylene and 2 to 20 weight percent acrylamide of the formula CH 2 =CX--CO--NHY, wherein X is hydrogen or methyl, Y is hydrogen or CH 2 OZ, and Z is hydrogen, alkyl of 1 to 4 carbon atoms or acyl of 1 to 4 carbon atoms, obtained by emulsion copolymerizing, in an emulsifier-free aqueous medium, said vinyl ester; optionally ethylene; and said acrylamide and spray drying the resulting emulsifier free copolymerized product dispersion, in the absence of an anti-caking agent, to yield a free flowing dry copolymer powder.
Claim 3
Dependent Claim
50 words
The readily dispersible copolymer powder of claim 1 wherein the vinyl ester is a member selected from the group consisting of vinyl acetate, vinyl proprionate, vinyl butyrate, vinyl laurate and vinyl stearate and the acrylamide is a member selected from the group consisting of acrylamide, methacrylamide, N-methylol-methacrylamide and methacrylamide-N-methylolmethyl ether.
Claim 4
Dependent Claim
94 words
The dry readily dispersible copolymer powder of claim 1 wherein the copolymer is composed of from 50 to 92 weight percent of vinyl ester of the formula ##EQU1## from 0 to 45 weight percent of ethylene, and from 2 to 20 weight percent of acrylamide of the formula ##EQU2## where R is a straight-chained or branched alkyl of 1 to 18 carbon atoms, X is hydrogen or methyl, Y is hydrogen or CH 2 OZ, and Z is hydrogen, alkyl of 1 to 4 carbon atoms or acyl of 1 to 4 carbon atoms.
Claim 5
Dependent Claim
19 words
The readily dispersible copolymer powder of claim 1 which contains from 0 to 40 weight percent of inorganic fillers.
Claim 6
Dependent Claim
100 words
The process for the preparation of a readily dispersible emulsifier-free and anti-caking agent free copolymer powder which comprises copolymerizing in an emulsifier-free aqueous medium at least one vinyl ester; optionally ethylene; and at least one acrylamide of the formula CH 2 =CX--CO--NHY, wherein X is hydrogen or methyl, Y is hydrogen or CH 2 OZ, and Z is hydrogen, alkyl of 1 to 4 carbon atoms or acyl of 1 to 4 carbon atoms, and spray drying the resulting emulsifier free copolymerized product dispersion, in the absence of an anti-caking agent, to yield a free flowing powder of the copolymer.
Claim 7
Dependent Claim
100 words
The process for the preparation of a readily dispersible emulsifier-free and anti-caking agent free copolymer powder which comprises copolymerizing in an emulsifier-free aqueous medium at least one vinyl ester; optionally ethylene; and at least one acrylamide of the formula CH 2 =CX--CO--NHY, wherein X is hydrogen or methyl, Y is hydrogen or CH 2 OZ, and Z is hydrogen, alkyl of 1 to 4 carbon atoms or acyl of 1 to 4 carbon atoms, and spray drying the resulting emulsifier free copolymerized product dispersion, in the absence of an anti-caking agent, to yield a free flowing powder of the copolymer.
Claim 8
Dependent Claim
51 words
The process of claim 5 wherein the copolymer comprises 50 to 92 weight percent vinyl ester of the formula ##EQU3## wherein R is straight-chain or branched alkyl of 1 to 18 carbon atoms, from 0 to 45 weight percent of ethylene, and from 2 to 20 weight percent of said acrylamide.
Claim 9
Dependent Claim
14 words
The process of claim 6 wherein the copolymerizing is carried out by emulsion polymerization.
Claim 10
Dependent Claim
52 words
The process for preparing the copolymer powder of claim 5 wherein the vinyl ester is a member selected from the group consisting of vinyl acetate, vinyl proprionate, vinyl butyrate, vinyl laurate and vinyl stearate and the acrylamide is a member selected from the group consisting of acrylamide, methacrylamide, N-methylol-methacrylamide and methacrylamide-N-methylol-methyl ether.
Claim 11
Dependent Claim
54 words
The process for the preparation of the readily dispersible copolymer powder of claim 5 which comprises spraying an aqueous, emulsifier-free dispersion of a copolymerization product of at least one of said vinyl esters; optionally ethylene; and at least one of said acrylamides in a drying tower using air or nitrogen as a drying gas.
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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) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |