US4401798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of vinyl halide polymers that uses an alkyl-substituted trisphenol as the chain-terminating agent
Assignee: Occidental Chemical Corp
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Filing: 1982-04-22
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Granted: 1983-08-30
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Expires: 2002-04-22
Abstract
Abstract The polymerization of a monomer component that comprises vinyl chloride in an aqueous medium in the presence of a free radical generating polymerization initiator is terminated by introducing into the polymerization reaction mixture when from 70% to 95% of the monomer component has been polymerized from 0.01% to 0.10% by weight, based on the weight of the monomer component, of a chain-terminating agent that is an alkyl-substituted trisphenol, such as 1,1,3-tris(2-methyl-4-hydroxy-5-tert.butylphenyl)butane.
Inventors
- 👤 Mario Q. Ceprini
- 👤 Donald Goodman
- 👤 Samuel Hoch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:41
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/38; C08F14/00; C08F14/02; C08F14/04; C08F14/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
145 words
In the process for the polymerization of a monomer component selected from the group consisting of vinyl halides and mixtures of a vinyl halide with at least one ethylenically-unsaturated monomer that is copolymerizable therewith, said mixtures containing at least 70% by weight of the vinyl halide, in an aqueous medium at a temperature in the range of 40° C. to 80° C. in the presence of a free radical generating polymerization initiator, the improvement that comprises adding to the polymerization reaction mixture when from about 70% to 95% of the monomer component has been polymerized from 0.01% to 0.10% by weight, based on the weight of the monomer component, of a chain-terminating agent having the structural formula ##STR3## wherein R represents hydrogen or an alkyl group having 1 to 4 carbon atoms and each R' represents an alkyl group having 1 to 4 carbon atoms.
Claim 2
Dependent Claim
145 words
In the process for the polymerization of a monomer component selected from the group consisting of vinyl halides and mixtures of a vinyl halide with at least one ethylenically-unsaturated monomer that is copolymerizable therewith, said mixtures containing at least 70% by weight of the vinyl halide, in an aqueous medium at a temperature in the range of 40° C. to 80° C. in the presence of a free radical generating polymerization initiator, the improvement that comprises adding to the polymerization reaction mixture when from about 70% to 95% of the monomer component has been polymerized from 0.01% to 0.10% by weight, based on the weight of the monomer component, of a chain-terminating agent having the structural formula ##STR3## wherein R represents hydrogen or an alkyl group having 1 to 4 carbon atoms and each R' represents an alkyl group having 1 to 4 carbon atoms.
Claim 3
Dependent Claim
28 words
The process of claim 1 wherein the chain-terminating agent is added to the polymerization reaction mixture when from 75% to 90% of the monomer component has been polymerized.
Claim 4
Dependent Claim
31 words
The process of claim 1 wherein from 0.02% to 0.05% by weight, based on the weight of the monomer component, of the chain-terminating agent is added to the polymerization reaction mixture.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein the chain-terminating agent is 1,1,3-tris(2-methyl-4-hydroxy-5-tert.butylphenyl)butane.
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein the monomer component consists essentially of vinyl chloride.
Claim 7
Dependent Claim
27 words
The process of claim 1 wherein the monomer component contains 80% to 90% by weight of vinyl chloride and 10% to 20% by weight of vinyl acetate.
References Cited (Backward Citations)
US3808184A
Cited
US3985721A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |