Patent US4368310A successfully refreshed from Google Patents.
US4368310A
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US
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Method of polymerizing sheets
Assignee: PPG Industries Inc
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Filing: 1981-10-23
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Granted: 1983-01-11
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Expires: 2001-10-23
Abstract
Abstract Disclosed is a method of polymerizing a monomer by forming a film or pool of monomer atop an immiscible liquid and initiating the polymerization. In this way there is obtained a thin sheet of polymers substantially free of imperfections on the surface thereof in contact with the liquid. According to a further exemplification a second, less dense, but also immiscible liquid is established above the monomer whereby to form a second smooth surface.
Inventors
- 👤 Ivan R. Leatherman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:13
CPC Classifications
C; C08; C08F; C08F18/00; C08F18/24
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
54 words
A method of polymerizing aliphatic diol bis(allyl carbonate) monomer to form polymers thereof comprising: providing a pool of liquid in which the monomers and the polymers to be formed are substantially insoluble; forming a layer of monomer and initiator atop the pool of liquid; and thereafter recovering polymer from atop the pool of liquid.
Claim 2
Independent Claim
54 words
A method of polymerizing aliphatic diol bis(allyl carbonate) monomer to form polymers thereof comprising: providing a pool of liquid in which the monomers and the polymers to be formed are substantially insoluble; forming a layer of monomer and initiator atop the pool of liquid; and thereafter recovering polymer from atop the pool of liquid.
Claim 3
Dependent Claim
27 words
The method of claim 1 comprising continuously forming a layer of monomer and liquid on the liquid pool, and continuously recovering polymer from atop the liquid pool.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein the liquid pool comprises mercury.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein the liquid pool comprises an aqueous solution of higher density than the monomer and the polymer.
References Cited (Backward Citations)
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Cited
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Cited
US3816571A
Cited
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US4095772A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |