US4189559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of polymers in bead form from water-soluble, ethylenically unsaturated monomers
Assignee: BASF SE
•
Filing: 1977-07-20
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Granted: 1980-02-19
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Expires: 1997-07-20
Abstract
Abstract Production of polymers in bead form by forming a water-in-oil suspension of an aqueous solution containing at least one water-soluble ethylenically unsaturated monomer in an inert hydrophobic liquid organic dispersion medium and polymerizing the suspended monomer in the presence of a polymerization initiator and a protective colloid obtained by reacting an oily or resinous polymer of an olefin and/or diolefin, said polymer containing hydrogen atoms in the allyl position, with 2 to 30% by weight, based on the oil and/or resin, of maleic anhydride.
Inventors
- 👤 Uwe Bueltjer
- 👤 Dietmar Jung
- 👤 Hans-Uwe Schenck
- 👤 Herbert Spoor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:22
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
141 words
In a process for the production of polymers, in bead form, of water-soluble ethylenically unsaturated monomers by forming a water-in-oil suspension of an aqueous solution containing at least one water-soluble ethylenically unsaturated monomer in an inert hydrophobic liquid organic dispersion medium and polymerizing the suspended monomer in the presence of a protective colloid and a polymerization initiator, the improvement which comprises using as protective colloid a reaction product obtained by reacting an oily or resinous polymer having a molecular weight of from 750 to 50,000 of a member selected from the groups consisting of an olefin and a diolefin having two to six carbon atoms, said polymer containing hydrogen in the allyl position, with 2 to 30% by weight, based on the oil and/or resin, of maleic anhydride, said reaction product being soluble in the inert hydrophobic liquid organic dispersion medium.
Claim 2
Dependent Claim
141 words
In a process for the production of polymers, in bead form, of water-soluble ethylenically unsaturated monomers by forming a water-in-oil suspension of an aqueous solution containing at least one water-soluble ethylenically unsaturated monomer in an inert hydrophobic liquid organic dispersion medium and polymerizing the suspended monomer in the presence of a protective colloid and a polymerization initiator, the improvement which comprises using as protective colloid a reaction product obtained by reacting an oily or resinous polymer having a molecular weight of from 750 to 50,000 of a member selected from the groups consisting of an olefin and a diolefin having two to six carbon atoms, said polymer containing hydrogen in the allyl position, with 2 to 30% by weight, based on the oil and/or resin, of maleic anhydride, said reaction product being soluble in the inert hydrophobic liquid organic dispersion medium.
Claim 3
Dependent Claim
27 words
A process as claimed in claim 1, wherein 0.01 to 2% by weight, based on the inert hydrophobic liquid dispersion medium, of the suspending agent is used.
Claim 4
Dependent Claim
34 words
A process as claimed in claim 1, wherein an oil of polybutadiene having a molecular weight of from 1,000 to 30,000 is reacted with maleic anhydride at temperatures of from 180° to 240° C.
References Cited (Backward Citations)
US3948866A
Cited
US3933763A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-18 | 1983-08-20 | 1984-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-18 | 1987-08-20 | 1988-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-18 | 1991-08-20 | 1992-02-19 | $7700.00 | Window Closed / Lapsed |