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
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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 09:31
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
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US2979492A
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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 |