Patent US4086411A successfully refreshed from Google Patents.
US4086411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing vinyl chloride monomer from a vinyl chloride polymer
Assignee: Tosoh Corp
•
Filing: 1975-12-09
•
Granted: 1978-04-25
•
Expires: 1995-12-09
Abstract
Abstract A method of removing vinyl chloride monomer which remains in a polymer of vinyl chloride, which comprises irradiating the polymer of vinyl chloride with a high energy electromagnetic wave to excite the vinyl chloride monomer in said polymer to remove unreacted monomer.
Inventors
- 👤 Mineo Nagano
- 👤 Koji Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:30
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/006; C08F259/00; C08F259/02; C08F259/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
51 words
A method of removing vinyl chloride monomer which remains in a homopolymers or copolymers of vinyl chloride, which comprises irradiating said polymer of vinyl chloride with high energy electromagnetic radiation, having a frequency of 10-100 MHz, to excite said vinyl chloride monomer in said polymer thereby removing said vinyl chloride monomer.
Claim 2
Independent Claim
51 words
A method of removing vinyl chloride monomer which remains in a homopolymers or copolymers of vinyl chloride, which comprises irradiating said polymer of vinyl chloride with high energy electromagnetic radiation, having a frequency of 10-100 MHz, to excite said vinyl chloride monomer in said polymer thereby removing said vinyl chloride monomer.
Claim 3
Dependent Claim
16 words
The method of Claim 1 wherein the energy of said radiation is 0.01-100 watts/cm 3 .
Claim 4
Dependent Claim
14 words
The method of claim 1, wherein the irradiation is conducted under a reduced pressure.
Claim 5
Dependent Claim
27 words
The method of claim 1, wherein a wet cake of the polymer of vinyl chloride is irradiated by the electromagnetic wave to excite the vinyl chloride monomer.
References Cited (Backward Citations)
US2050595A
Cited
US2945795A
Cited
US2979492A
Cited
US3188265A
Cited
GB1226988A
Cited
US3787187A
Cited
USB313029I5
Cited
US3846521A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-24 | 1981-10-24 | 1982-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-24 | 1985-10-24 | 1986-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-24 | 1989-10-24 | 1990-04-25 | $7700.00 | Window Closed / Lapsed |