US4164613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of polymers in bead form from water-soluble, ethylenically unsaturated monomers
Assignee: BASF SE
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Filing: 1977-07-20
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Granted: 1979-08-14
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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 polymerizing (A) 60 to 100% by weight of at least one monomer selected from the group consisting of cyclopentadiene, dicyclopentadiene, tricyclopentadiene and alkyl-substituted derivatives thereof, and (B) 0 to 40% by weight, based on the mixture of (A) and (B), of a mono- or diethylenically unsaturated monomer copolymerizable with (A).
Inventors
- 👤 Richard Hoene
- 👤 Dietmar Jung
- 👤 Hans-Uwe Schenck
- 👤 Herbert Spoor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:25
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/32
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
138 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 a protective colloid a polymer obtained by polymerizing a mixture of (A) 60 to 99.9% by weight of dicyclopentadiene, and (B) 0 to 30% by weight of styrene and 0.1 to 10% by weight of maleic anhydride, said protective colloid polymer being soluble in the inert hydrophobic liquid organic dispersion medium, said protective colloid polymer further having a number-average molecular weight of from 400 to 5,000 and an iodine number of from 30 to 200.
Claim 2
Dependent Claim
138 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 a protective colloid a polymer obtained by polymerizing a mixture of (A) 60 to 99.9% by weight of dicyclopentadiene, and (B) 0 to 30% by weight of styrene and 0.1 to 10% by weight of maleic anhydride, said protective colloid polymer being soluble in the inert hydrophobic liquid organic dispersion medium, said protective colloid polymer further having a number-average molecular weight of from 400 to 5,000 and an iodine number of from 30 to 200.
Claim 3
Dependent Claim
108 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 a protective colloid a homopolymer of dicyclopentadiene, said protective colloid polymer being soluble in the inert hydrophobic liquid organic dispersion medium, said protective colloid polymer further having a number-average molecular weight of from 400 to 5,000 and an iodine number of from 30 to 200.
Claim 4
Dependent Claim
108 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 a protective colloid a homopolymer of dicyclopentadiene, said protective colloid polymer being soluble in the inert hydrophobic liquid organic dispersion medium, said protective colloid polymer further having a number-average molecular weight of from 400 to 5,000 and an iodine number of from 30 to 200.
Claim 5
Dependent Claim
27 words
A process as set forth in claim 1, wherein the protective colloid polymer is a copolymer of dicyclopentadiene and 0.1 to 10% by weight of maleic anhydride.
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) | 1982-08-13 | 1983-02-12 | 1983-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-13 | 1987-02-12 | 1987-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-13 | 1991-02-12 | 1991-08-14 | $7700.00 | Window Closed / Lapsed |