US3978162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing vinyl chloride graft copolymers
Assignee: Ryo-Nichi Co Ltd
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Filing: 1975-07-07
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Granted: 1976-08-31
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Expires: 1995-07-07
Abstract
Abstract A process for producing a vinyl chloride grapht copolymer, wherein vinyl chloride is graft polymerized onto an ethylene-propylene-diene copolymer to produce a vinyl chloride graft copolymer containing 10 to 60% by weight of the ethylene-propylene-diene copolymer, carried out in the form of suspension polymerization in aqueous phase in the presence of an aliphatic alcohol of not less than 8 carbon atoms.
Inventors
- 👤 Kakusaburo Nakanishi
- 👤 Tatsuro Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:06
CPC Classifications
C; C08; C08F; C08F255/00; C08F255/02; C08F255/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
64 words
A process for producing a vinyl chloride graft copolymer wherein vinyl chloride is graft-polymerized to an ethylene-propylene-diene copolymer thereby to obtain a vinyl chloride graft copolymer containing 10 - 60% by weight of the ethylene-propylene-diene copolymer, comprising carring out said graft-polymerization in the form of suspension polymerization in aqueous phase in the presence of an aliphatic alcohol of not less than 8 carbon atoms.
Claim 2
Dependent Claim
64 words
A process for producing a vinyl chloride graft copolymer wherein vinyl chloride is graft-polymerized to an ethylene-propylene-diene copolymer thereby to obtain a vinyl chloride graft copolymer containing 10 - 60% by weight of the ethylene-propylene-diene copolymer, comprising carring out said graft-polymerization in the form of suspension polymerization in aqueous phase in the presence of an aliphatic alcohol of not less than 8 carbon atoms.
Claim 3
Dependent Claim
35 words
A process as claimed in claim 1, wherein said aliphatic alcohol is at least one member selected from the group consisting of octyl alcohol, 2-ethylhexyl alcohol, decyl alcohol, lauryl alcohol, stearyl alcohol and palmityl alcohol.
Claim 4
Dependent Claim
34 words
A process as claimed in claim 1, wherein said alcohol is used in amount of 0.1 to 10% by weight based on the total weight of the ethylene-propylene-diene copolymer plus the vinyl chloride monomer.
Claim 5
Dependent Claim
24 words
A process as claimed in claim 1, wherein said ethylene-propylene-diene copolymer has a Mooney viscosity (ML 100°C 1 + 4) of 20 - 120.
Claim 6
Dependent Claim
54 words
A process as claimed in claim 1, wherein said ethylene-propylene-diene copolymer has the diene content of 2 -20 in terms of iodine value and the propylene content of 20 - 50% by weight, said diene content being derived from at least one member selected from the group consisting of dicyclopentadiene, ethylidenenorbornene, methylenenorbornene and 1,4-hexadiene.
Claim 7
Dependent Claim
57 words
A process as claimed in claim 1, wherein the ethylene-propylene-diene copolymer, the vinyl chloride monomer, water and the aliphatic alcohol together with an oil-soluble polymerization initiator are charged first to the reaction vessel and then the mixture is stirred to effect dissolution of said copolymer, and thereafter a dispersant is added to the mixture to initiate polymerization.
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) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |