US4098771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of polymers of vinylene carbonate
Assignee: Hoechst AG
•
Filing: 1976-12-15
•
Granted: 1978-07-04
•
Expires: 1996-12-15
Abstract
Abstract Vinylene carbonate may be polymerized in bulk, in solution or in dispersion by means of free radical forming initiators. Suitable comonomers are vinyl compounds. The polymerization is carried out generally at a temperature of 40 to 170° C. The dispersing agents used in the dispersion polymerization are organic compounds which are liquid under normal conditions and which do not dissolve vinylene carbonate. Homo- and copolymers of vinylene carbonate may be used as starting material for the preparation of homo- and copolymers of vinylene glycol.
Inventors
- 👤 Heinrich Huemer
- 👤 Karlheinz Burg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:26
CPC Classifications
C; C08; C08F; C08F34/00; C08F34/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
85 words
In a process for the preparation of polymers of vinylene carbonate by polymerization of vinylene carbonate together with 0 to 25 mole %, calculated on vinylene carbonate, of a vinyl compound copolymerizable with vinylene carbonate, in the presence of a free radical forming initiator, at a temperature of 40° to 170° C., the improvement which comprises carrying out the polymerization in a dispersing agent which is an organic liquid in which the vinylene carbonate and the product polymer are essentially insoluble under the polymerization conditions.
Claim 2
Dependent Claim
85 words
In a process for the preparation of polymers of vinylene carbonate by polymerization of vinylene carbonate together with 0 to 25 mole %, calculated on vinylene carbonate, of a vinyl compound copolymerizable with vinylene carbonate, in the presence of a free radical forming initiator, at a temperature of 40° to 170° C., the improvement which comprises carrying out the polymerization in a dispersing agent which is an organic liquid in which the vinylene carbonate and the product polymer are essentially insoluble under the polymerization conditions.
Claim 3
Dependent Claim
111 words
In a process for the preparation of polymers of vinylene carbonate by polymerization of vinylene carbonate together with 0 to 25 mole %, calculated on the vinylene carbonate, of a vinyl compound copolymerizable therewith, in the presence of a free radical forming initiator at a temperature of 40° to 170° C., the improvement which comprises carrying out the polymerization in a dispersing agent that is a liquid aliphatic hydrocarbon or mixture of aliphatic hydrocarbons of 6 to 16 carbon atoms in which vinylene carbonate and the product polymer are both essentially insoluble under the conditions of the polymerization reaction, said polymerization being carried out in the presence of a dispersion stabilizer.
Claim 4
Dependent Claim
111 words
In a process for the preparation of polymers of vinylene carbonate by polymerization of vinylene carbonate together with 0 to 25 mole %, calculated on the vinylene carbonate, of a vinyl compound copolymerizable therewith, in the presence of a free radical forming initiator at a temperature of 40° to 170° C., the improvement which comprises carrying out the polymerization in a dispersing agent that is a liquid aliphatic hydrocarbon or mixture of aliphatic hydrocarbons of 6 to 16 carbon atoms in which vinylene carbonate and the product polymer are both essentially insoluble under the conditions of the polymerization reaction, said polymerization being carried out in the presence of a dispersion stabilizer.
Claim 5
Dependent Claim
131 words
In a process for the preparation of polymers of vinylene carbonate by polymerization of vinylene carbonate together with 0 to 25 mole %, calculated on the vinylene carbonate, of a vinyl compound copolymerizable therewith, in the presence of a free radical forming initiator at a temperature of 40° to 170° C., the improvement which comprises carrying out the polymerization in a dispersing agent that is a hydrocarbon which forms a two-phase system with vinylene carbonate and the product polymer and is selected from the group consisting of n-hexane, n-heptane, n-octane, cyclohexane, iso-octane and benzine fractions having a boiling range of 90° to 170° C., in the presence of a dispersion stabilizer selected from the group consisting of ethoxylated fatty acid esters and partial esters and ethoxylated fatty acids, alcohols and amides.
Claim 6
Dependent Claim
131 words
In a process for the preparation of polymers of vinylene carbonate by polymerization of vinylene carbonate together with 0 to 25 mole %, calculated on the vinylene carbonate, of a vinyl compound copolymerizable therewith, in the presence of a free radical forming initiator at a temperature of 40° to 170° C., the improvement which comprises carrying out the polymerization in a dispersing agent that is a hydrocarbon which forms a two-phase system with vinylene carbonate and the product polymer and is selected from the group consisting of n-hexane, n-heptane, n-octane, cyclohexane, iso-octane and benzine fractions having a boiling range of 90° to 170° C., in the presence of a dispersion stabilizer selected from the group consisting of ethoxylated fatty acid esters and partial esters and ethoxylated fatty acids, alcohols and amides.
References Cited (Backward Citations)
US3021340A
Cited
US2934514A
Cited
US2945836A
Cited
US2930779A
Cited
US2993030A
Cited
US3037965A
Cited
US3431278A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |