Patent US4073774A successfully refreshed from Google Patents.
US4073774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of dichloroethylene polymers
Assignee: General Electric Co
•
Filing: 1977-04-20
•
Granted: 1978-02-14
•
Expires: 1997-04-20
Abstract
Abstract Dichloroethylene polymers can be made by the reaction of tetrachloroethylene with a dialkali-metal salt of bisphenol-A. The latter polymers are useful in the molding and coating arts.
Inventors
- 👤 Clayton B. Quinn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:15
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/40; C08G65/4006; C08G2650/00; C08G2650/28; C08G2650/46; C08G2650/48
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
66 words
The process for making solid polymers comprising units of the formula ##STR3## where n is a whole number greater than 1, which comprises effecting reaction between a dialkali-metal salt of bisphenol-A and tetrachloroethylene in an aprotic solvent and thereafter isolating the formed polymers, there being employed a molar ratio of from 0.9 to 1.1 mols of the dialkali-metal salt of bisphenol-A per mol of the tetrachloroethylene.
Claim 2
Dependent Claim
66 words
The process for making solid polymers comprising units of the formula ##STR3## where n is a whole number greater than 1, which comprises effecting reaction between a dialkali-metal salt of bisphenol-A and tetrachloroethylene in an aprotic solvent and thereafter isolating the formed polymers, there being employed a molar ratio of from 0.9 to 1.1 mols of the dialkali-metal salt of bisphenol-A per mol of the tetrachloroethylene.
Claim 3
Dependent Claim
51 words
The process as in claim 1 wherein the reaction is carried out by means of an in situ formation of the dialkalimetal salt of bisphenol-A by reacting bisphenol-A and the tetrachloroethylene in the presence of an inorganic alkali-metal compound capable of generating the alkali-metal ion needed to form the alkali-metal salt.
Claim 4
Dependent Claim
16 words
The process as in claim 2 wherein the dialkalimetal salt is the disodium salt of bisphenol-A.
Claim 5
Dependent Claim
16 words
The process as in claim 2 wherein the dialkalimetal salt is the dipotassium salt of bisphenol-A.
Claim 6
Dependent Claim
13 words
The process as in claim 1 wherein the aprotic solvent is dimethyl formamide.
Claim 7
Dependent Claim
13 words
The process as in claim 1 wherein the aprotic solvent is hexamethyl phosphoramide.
Claim 8
Dependent Claim
19 words
A solid polymeric composition comprising the recurring unit ##STR4## where n is a whole number in excess of 1.
Claim 9
Dependent Claim
19 words
A solid polymeric composition comprising the recurring unit ##STR4## where n is a whole number in excess of 1.
References Cited (Backward Citations)
US2568658A
Cited
US2587437A
Cited
US3453237A
Cited
US3312662A
Cited
US3248366A
Cited
US3629197A
Cited
US3770697A
Cited
US3789052A
Cited
US3989672A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |