US4299940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the control of free radical polymerization
Assignee: Stauffer Chemical Co
•
Filing: 1979-12-27
•
Granted: 1981-11-10
•
Expires: 1999-12-27
Abstract
Abstract The free radical copolymerization of vinyl chloride, vinyl acetate, and bis(hydrocarbyl)vinyl phosphonate in emulsion is moderated by the addition at the beginning of the reaction of an electronically resonating additive such as alphamethylstyrene. The use of such an additive limits the increase in viscosity of the system without retarding the rate of polymerization.
Inventors
- 👤 Chung H. Wei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:54
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/02; C08F214/04; C08F214/06; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
99 words
In a process for the emulsion copolymerization of a reaction mixture comprising a monomer charge having from about 70 to about 90 weight percent vinyl chloride monomer, from about 5 to about 15 weight percent of a bis(hydrocarbyl)vinylphosphonate monomer, and the balance of the monomer charge substantially vinyl acetate, by free radical means the improvement comprising the addition of from about 0.0005 percent to about 0.1 percent of the weight of the monomer charge of a copolymerizable compound having a Q-value greater than 0.9 and an e-value more negative than -0.5 to control the viscosity of the reaction mixture.
Claim 2
Dependent Claim
99 words
In a process for the emulsion copolymerization of a reaction mixture comprising a monomer charge having from about 70 to about 90 weight percent vinyl chloride monomer, from about 5 to about 15 weight percent of a bis(hydrocarbyl)vinylphosphonate monomer, and the balance of the monomer charge substantially vinyl acetate, by free radical means the improvement comprising the addition of from about 0.0005 percent to about 0.1 percent of the weight of the monomer charge of a copolymerizable compound having a Q-value greater than 0.9 and an e-value more negative than -0.5 to control the viscosity of the reaction mixture.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the copolymerizable compound is selected from the group consisting of alpha-methylstyrene, styrene, 1,3-butadiene, and acenaphthylene.
Claim 4
Dependent Claim
10 words
The process of claim 1 wherein the bis(hydrocarbyl)vinylphosphonate is bis(beta-chloroethyl)vinylphosphonate.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein the copolymerizable compound is alpha-methylstyrene.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein the copolymerizable compund is styrene.
Claim 7
Dependent Claim
11 words
The process of claim 1 wherein the copolymerizable compound is 1,3-butadiene.
Claim 8
Dependent Claim
11 words
The process of claim 1 wherein the copolymerizable compound is acenaphthylene.
Claim 9
Dependent Claim
21 words
The process of claim 1 wherein the copolymerization is carried out at a temperature from about 30° to about 80° C.
Claim 10
Dependent Claim
28 words
The process of claim 1 wherein the amount of the copolymerizable compound added is from about 0.0005 to about 0.005 percent by weight of the total monomers charged.
References Cited (Backward Citations)
US4014837A
Cited
US3993715A
Cited
US4035571A
Cited
US3983294A
Cited
US4097663A
Cited
US4031045A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-09 | 1985-05-11 | 1985-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-09 | 1989-05-11 | 1989-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-09 | 1993-05-11 | 1993-11-10 | $7700.00 | Window Closed / Lapsed |