US4043968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing methylolated amide copolymers in concentrated organic solvent solution
Assignee: Valspar Corp
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Filing: 1976-01-30
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Granted: 1977-08-23
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Expires: 1996-01-30
Abstract
Abstract Monoethylenically unsaturated monomers including an amide monomer are copolymerized in organic solvent solution to provide an amide copolymer solution, and volatile nitrogen-containing materials are removed from the solution without removing more than 15% of the solvent, based on the weight of the solution, and then the amide copolymer is reacted in the solution with formaldehyde in the presence of an acid catalyst, to methylolate the same.
Inventors
- 👤 Arthur T. Spencer
- 👤 Stanley F. Siranovich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:43
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/28
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
126 words
A process for the production of methylolated amide copolymers in concentrated alcoholic organic solvent solution comprising, copolymerizing polymerizable monomers consisting essentially of monoethylenically unsaturated monomers, at least 50% of which are monoethylenically unsaturated monomers selected from vinyl aromatic hydrocarbons, acrylic-type esters, vinyl esters and monoethylenic nitriles, and including from 4-25% of an amide monomer selected from acrylamide or methacrylamide, in alcoholic organic solvent solution to provide an amide copolymer solution, removing volatile nitrogen-containing decomposition products of the amide monomer in an amount corresponding to at least 0.5% by weight of the amide monomer used without removing more than 15% of solvent, based on the weight of the solution, and then reacting the amide copolymer in said solution with formaldehyde in the presence of an acid catalyst.
Claim 2
Dependent Claim
126 words
A process for the production of methylolated amide copolymers in concentrated alcoholic organic solvent solution comprising, copolymerizing polymerizable monomers consisting essentially of monoethylenically unsaturated monomers, at least 50% of which are monoethylenically unsaturated monomers selected from vinyl aromatic hydrocarbons, acrylic-type esters, vinyl esters and monoethylenic nitriles, and including from 4-25% of an amide monomer selected from acrylamide or methacrylamide, in alcoholic organic solvent solution to provide an amide copolymer solution, removing volatile nitrogen-containing decomposition products of the amide monomer in an amount corresponding to at least 0.5% by weight of the amide monomer used without removing more than 15% of solvent, based on the weight of the solution, and then reacting the amide copolymer in said solution with formaldehyde in the presence of an acid catalyst.
Claim 3
Dependent Claim
30 words
A process as recited in claim 1 in which the amide monomer is acrylamide, and is used in an amount of from 6-15%, based on the weight of total monomer.
Claim 4
Dependent Claim
29 words
A process as recited in claim 1 in which the solids content of the system is maintained at a level of at least 40% by weight throughout the process.
Claim 5
Dependent Claim
26 words
A process as recited in claim 3 in which the solids content is maintained at a level of at least 50% by weight throughout the process.
Claim 6
Dependent Claim
29 words
A process as recited in claim 1 in which volatile nitrogen-containing materials are removed in an amount corresponding to at least 1% by weight of the amide monomer used.
Claim 7
Dependent Claim
49 words
A process as recited in claim 1 in which volatile nitrogen-containing materials are removed by refluxing the amide copolymer solution while maintaining a temperature at the head of the condenser of at least about 35°-40° C. to condense the solvents employed in the solution without condensing the nitrogen-containing materials.
Claim 8
Dependent Claim
24 words
A process as recited in claim 6 in which the temperature at the head of the condenser is in the range of 60°-120° C.
Claim 9
Dependent Claim
43 words
A process as recited in claim 1 in which the volatile nitrogen-containing materials are removed by blowing an inert gas through the hot amide copolymer solution maintained at a temperature below reflux temperature, the vapors which are removed not being condensed and returned.
Claim 10
Dependent Claim
49 words
A process as recited in claim 1 in which the vinyl aromatic hydrocarbon is styrene or vinyl toluene, the acrylic-type ester is methyl methacrylate, ethyl acrylate, butyl acrylate, isobutyl acrylate, or methacrylates corresponding to the aforesaid acrylates, the monoethylenic nitrile is acrylonitrile, and the vinyl ester is vinyl acetate.
Claim 11
Dependent Claim
36 words
A process as recited in claim 9 in which said alcoholic organic solvent is constituted by a mixture of aromatic hydrocarbon and an alcohol selected from the group consisting of butanol, 2-ethoxy ethanol and 2-butoxy ethanol.
References Cited (Backward Citations)
US3163623A
Cited
US3607802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |