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Patent US3969328A successfully refreshed from Google Patents.
US3969328A
Expired / Lapsed
US
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Copolymers of vinyl chloride and 2-hydroxypropyl-alkyl maleate
Assignee: Wacker Chemie AG
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Filing: 1974-03-29
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Granted: 1976-07-13
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Expires: 1994-03-29
Abstract
Abstract Copolymers of vinyl chloride and 2-hydroxypropyl-alkyl maleate and/or fumarate consisting of a copolymer with from 65% to 95% by weight of vinyl chloride monomer units and from 5% to 35% by weight of 2-hydroxypropyl-alkyl maleate and/or fumarate monomer units, where alkyl has from 8 to 18 carbon atoms and is preferably branched, optionally with up to 15% of a dialkyl maleate and/or fumarate monomer units, where each alkyl has from 8 to 18 carbon atoms, said copolymer having a K-value of from 20 to 50 measured in cyclohexanone, as well as the method of producing the same by continuous addition of the monomer mix to an aqueous emulsion.
Inventors
- 👤 Dieter Kurz
- 👤 Alex Sabel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:19
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/02; C08F214/04; C08F214/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
48 words
Copolymers of vinyl chloride and 2-hydroxypropyl-alkyl maleates consisting of a copolymerizate with from 65% to 95% by weight of vinyl chloride monomer units, and from 5% to 35% by weight of 2-hydroxypropyl-isononyl maleate monomer units, said copolymerizate having a K-value of from 25 to 40 measured in cyclohexanone.
Claim 2
Dependent Claim
48 words
Copolymers of vinyl chloride and 2-hydroxypropyl-alkyl maleates consisting of a copolymerizate with from 65% to 95% by weight of vinyl chloride monomer units, and from 5% to 35% by weight of 2-hydroxypropyl-isononyl maleate monomer units, said copolymerizate having a K-value of from 25 to 40 measured in cyclohexanone.
Claim 3
Dependent Claim
33 words
The copolymers of claim 1 wherein from 70% to 85% by weight of said vinyl chloride monomer units and from 15% to 30% by weight of said 2-hydroxypropyl-isononyl maleate monomer units are present.
Claim 4
Dependent Claim
105 words
A process for the production of the copolymers of claim 1 comprising the steps of preparing an aqueous phase containing at least one water-soluble free radical polymerization catalyst and at least one oil-in-water emulsifier, continuously adding thereto a mixture of vinyl chloride and 2-hydroxypropyl-isononyl maleate in amounts sufficient to give a copolymerizate having from 65% to 95% by weight of vinyl chloride monomer units, from 5% to 35% by weight of 2-hydroxypropyl-isononyl maleate monomer units, while stirring at a temperature of between 30°C and 80°C at a rate sufficient that the saturation vapor pressure of the vinyl chloride is not attained, and recovering said copolymer.
Claim 5
Dependent Claim
33 words
The process of claim 3 wherein from 70% to 85% by weight of said vinyl chloride monomer units and from 15% to 30% by weight of said 2-hydroxypropyl-isononyl maleate monomer units are present.
Claim 6
Dependent Claim
55 words
A binder composition for coating metal surfaces consisting of from 15% to 35% by weight of a binder consisting of 40% to 90% by weight of the binder of the copolymer of claim 1 and 10% to 60% by weight of the binder of cross-linking agents, from 65% to 85% by weight of lacquer solvents.
Claim 7
Dependent Claim
29 words
A varnish consisting of the binder composition of claim 5 and from 10% to 35% by volume, based on the volume of the binder and pigment content, of pigments.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |