US4124656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the bulk polymerization of alkenylaromatic compounds
Assignee: Shell Internationale Research Maatschappij BV
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Filing: 1977-06-16
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Granted: 1978-11-07
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Expires: 1997-06-16
Abstract
Abstract There is described a process for the homopolymerization or copolymerization in the bulk of alkenylaromatic compounds in a continuous flow agitation vessel. The feed of the monomer(s) is preheated and a controlled larger or smaller part of the preheated monomer feed is cooled, depending on the deviation of the temperature of the contents of the reaction vessel from the determined value. The inventive process ensures an improved constancy of the reaction temperature, and, consequently, of the molecular weight of the polymer obtained.
Inventors
- 👤 Wilfried Walkenhorst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:16
CPC Classifications
C; C08; C08F; C08F12/00; C08F291/00; C08F291/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
111 words
A process for making polymers of alkenylaromatic and alkenylcycloaliphatic monomeric compounds in a heated agitated continuous polymerization vessel to which one or more monomers are continuously fed and from which a polymeric product is continuously withdrawn which comprises heating a first stream of feed monomer to an elevated temperature, dividing said heated first stream into a second and third stream, introducing said second stream into said vessel, cooling said third stream to a temperature below the desired polymerization temperature and thereafter introducing it into said vessel and regulating the relative flow rates of said second and third streams to maintain the polymerization temperature in said vessel substantially at a desired value.
Claim 2
Dependent Claim
111 words
A process for making polymers of alkenylaromatic and alkenylcycloaliphatic monomeric compounds in a heated agitated continuous polymerization vessel to which one or more monomers are continuously fed and from which a polymeric product is continuously withdrawn which comprises heating a first stream of feed monomer to an elevated temperature, dividing said heated first stream into a second and third stream, introducing said second stream into said vessel, cooling said third stream to a temperature below the desired polymerization temperature and thereafter introducing it into said vessel and regulating the relative flow rates of said second and third streams to maintain the polymerization temperature in said vessel substantially at a desired value.
Claim 3
Dependent Claim
14 words
The process as claimed in claim 1, which comprises polymerizing styrene as alkenylaromatic compound.
Claim 4
Dependent Claim
24 words
The process as claimed in claim 1, which comprises copolymerizing said monomeric compound with a nitrile or an ester of acrylic or methacrylic acid.
Claim 5
Dependent Claim
22 words
The process as claimed in claim 1, which comprises copolymerizing said monomeric compound, in the presence of a natural or synthetic rubber.
Claim 6
Dependent Claim
34 words
A process as claimed in claim 1, which comprises copolymerizing said monomeric compound, together with a nitrile or an ester of acrylic or methacrylic acid, in the presence of a natural or synthetic rubber.
Claim 7
Dependent Claim
23 words
The process as claimed in claim 4 wherein the rubber is an ethylene-propylene-diene rubber wherein the diene may or may not be conjugated.
Claim 8
Dependent Claim
14 words
The process as claimed in claim 6, wherein the rubber is an ethylene-propylene-5-ethylidene-norbornene-2 rubber.
Claim 9
Dependent Claim
23 words
The process as claimed in claim 1, which comprises carrying out the polymerization until a polymer content of up to 70% is reached.
Claim 10
Dependent Claim
23 words
The process as claimed in claim 1, which comprises carrying out the polymerization until a polymer content of up to 55% is reached.
Claim 11
Dependent Claim
23 words
The process as claimed in claim 3, which comprises carrying out the polymerization until a polymer content of up to 45% is reached.
Claim 12
Dependent Claim
23 words
The process as claimed in claim 3, which comprises carrying out the polymerization until a polymer content of 20 to 30% is reached.
Claim 13
Dependent Claim
25 words
A process according to claim 1 wherein the flow rate of said third stream is varied in response to the polymerization temperature in said vessel.
Claim 14
Dependent Claim
38 words
A process according to claim 12 wherein the flow rate of said second stream is varied inversely in respect to the flow rate of said third stream to maintain the flow rate of said first stream substantially constant.
References Cited (Backward Citations)
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US3257375A
Cited
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US3679651A
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US4012573A
Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-06 | 1982-05-08 | 1982-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-06 | 1986-05-08 | 1986-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-06 | 1990-05-08 | 1990-11-07 | $7700.00 | Window Closed / Lapsed |