US4398008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thick polyol (allyl carbonate) polymerizates and method of preparing same
Assignee: PPG Industries Inc
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Filing: 1981-12-07
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Granted: 1983-08-09
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Expires: 2001-12-07
Abstract
Abstract Disclosed is a method of preparing a thick casting of polyol (allyl carbonate) by preparing a monolithic, partially cured, first polymerizate of polyol (allyl carbonate), forming a pool of polyol (allyl carbonate) monomer in contact with the monolithic, partially cured, first polymerizate, and thereafter forming a thick, single phase polyol (allyl carbonate) polymer. Also disclosed is the polymer prepared therefrom.
Inventors
- 👤 Michael S. Misura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:46
CPC Classifications
C; C08; C08F; C08F263/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
80 words
A method of forming a thick casting of polyol (allyl carbonate) comprising: (a) forming a monolithic rigid sheet comprising partially cured polymeric polyol (allyl carbonate); (b) forming a pool of polyol (allyl carbonate) monomer in contact with the monolithic rigid sheet of partially cured polymer; and (c) thereafter curing the monolithic rigid sheet of partially cured (monolithic polymerizate) polymer and the monomer in contact therewith whereby to form a single phase (second polymerizate) casting thicker than the monolithic rigid sheet.
Claim 2
Independent Claim
80 words
A method of forming a thick casting of polyol (allyl carbonate) comprising: (a) forming a monolithic rigid sheet comprising partially cured polymeric polyol (allyl carbonate); (b) forming a pool of polyol (allyl carbonate) monomer in contact with the monolithic rigid sheet of partially cured polymer; and (c) thereafter curing the monolithic rigid sheet of partially cured (monolithic polymerizate) polymer and the monomer in contact therewith whereby to form a single phase (second polymerizate) casting thicker than the monolithic rigid sheet.
Claim 3
Dependent Claim
65 words
The method of claim 1 comprising first curing said monomer to form the monolithic rigid sheet of partially cured polymer having a fifteen second Barcol hardness of less than 20, and thereafter curing the partially cured monolithic rigid sheet of partially cured polymer and the monomer in contact therewith whereby to form a single phase casting having a fifteen second Barcol hardness greater than 28.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein the single phase second casting has a substantially uniform index of refraction.
Claim 5
Dependent Claim
84 words
The method of claim 1 wherein the polyol (allyl carbonate) is a diol bis(allyl carbonate) having the formula ##STR18## where R 1 and R 3 are chosen from the group consisting of allyl groups independently represented by the formula ##STR19## where R 1 is chosen from the group consisting of hydrogen, halogen and C 1 to C 4 alkyls, and R 3 is chosen from the group consisting of alkylene groups, alkylene ether groups, alkylene polyether groups, alkylene carbonate groups, and alkylene polyether groups.
Claim 6
Dependent Claim
15 words
The method of claim 4 wherein the diol bis(allyl carbonate) is diethylene glycol bis(allyl carbonate).
Claim 7
Independent Claim
93 words
A method of forming a thick casting of polyol bis(allyl carbonate) comprising: (a) forming a monolithic rigid sheet having a fifteen second Barcol hardness of less than 20 and comprising partially cured polymeric polyol bis(allyl carbonate); (b) forming a pool of polyol (allyl carbonate) monomer in contact with the monolithic rigid sheet of partially cured polymer; and (c) thereafter curing the monolithic rigid sheet of partially cured polyol(allyl carbonate) and the polyol(allyl carbonate) monomer in contact therewith whereby to form a single phase casting having a fifteen second Barcol hardness greater than 28.
Claim 8
Independent Claim
93 words
A method of forming a thick casting of polyol bis(allyl carbonate) comprising: (a) forming a monolithic rigid sheet having a fifteen second Barcol hardness of less than 20 and comprising partially cured polymeric polyol bis(allyl carbonate); (b) forming a pool of polyol (allyl carbonate) monomer in contact with the monolithic rigid sheet of partially cured polymer; and (c) thereafter curing the monolithic rigid sheet of partially cured polyol(allyl carbonate) and the polyol(allyl carbonate) monomer in contact therewith whereby to form a single phase casting having a fifteen second Barcol hardness greater than 28.
Claim 9
Dependent Claim
15 words
The method of claim 6 wherein the polyol (allyl carbonate) is diethylene glycol bis(allyl carbonate).
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) | 1986-08-08 | 1987-02-07 | 1987-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-08 | 1991-02-07 | 1991-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-08 | 1995-02-07 | 1995-08-09 | $7700.00 | Window Closed / Lapsed |