Patent US4579758A successfully refreshed from Google Patents.
US4579758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internally coated reaction vessel for use in olefinic polymerization
Assignee: Oxy Vinyls LP
•
Filing: 1983-02-24
•
Granted: 1986-04-01
•
Expires: 2003-02-24
Abstract
Abstract This invention relates to a polymerization reaction vessel having a coating on the inner surfaces thereof resulting from applying thereto an aqueous coating solution of an alkali metal or ammonium salt of the reaction product or oligomers of an aromatic aldehyde, such as benzaldehyde, and the like, and a polyhydric phenol, such as resorcinol, and the like. When polymerizing olefinic monomers, such as vinyl halides, vinylidene halides, and vinylidene monomers having at least one terminal CH2=CH< group, and mixtures thereof, while a contact with said coating, polymer buildup on the inner surfaces of the reaction vessel is substantially eliminated.
Inventors
- 👤 John L. Dorsch
- 👤 John D. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:09
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/002; C08F2/004; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A polymerization reaction vessel having on all the internal surfaces thereof a coating comprised of the sodium salt of an oligomer(s) having the general structure ##STR2## wherein χ is an integer from 0 to 10, said oligomer(s) being the reaction product of benzaldehyde and resorcinol and wherein the coated surface are characterized by having a critical surface tension of at least 72 dynes/centimeter and a contact angle with water of about zero.
Claim 2
Dependent Claim
72 words
A polymerization reaction vessel having on all the internal surfaces thereof a coating comprised of the sodium salt of an oligomer(s) having the general structure ##STR2## wherein χ is an integer from 0 to 10, said oligomer(s) being the reaction product of benzaldehyde and resorcinol and wherein the coated surface are characterized by having a critical surface tension of at least 72 dynes/centimeter and a contact angle with water of about zero.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |