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Patent US4297466A successfully refreshed from Google Patents.
US4297466A
Expired / Lapsed
US
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Novel acrylic polymers and method of making same
Assignee: Office National d'Études et de Recherches Aérospatiales
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Filing: 1979-12-11
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Granted: 1981-10-27
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Expires: 1999-12-11
Abstract
Abstract The invention relates to poly(phenyl fluoracrylate) a novel polymer. The polymer is useful for the manufacture of transparent materials with very high heat stability.
Inventors
- 👤 Bertrand Bloch
- 👤 Chantal Cavalli born Meyer
- 👤 Denis Charrier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:15
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/22
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
10 words
An acrylic polymer comprising recurring units of the formula: ##STR2##
Claim 2
Dependent Claim
10 words
An acrylic polymer comprising recurring units of the formula: ##STR2##
Claim 3
Dependent Claim
19 words
An acrylic polymer comprising recurring units of the formula: ##STR3## said polymer having a softening point exceeding 140° C.
Claim 4
Dependent Claim
19 words
An acrylic polymer comprising recurring units of the formula: ##STR3## said polymer having a softening point exceeding 140° C.
Claim 5
Dependent Claim
14 words
A polymer according to claim 2 wherein said softening point is from 140°-170° C.
Claim 6
Dependent Claim
1 words
Polyphenyl-alpha-fluoroacrylate.
Claim 7
Dependent Claim
1 words
Polyphenyl-alpha-fluoroacrylate.
Claim 8
Dependent Claim
25 words
Process for the preparation of an acrylic polymer comprising recurring units of the formula: ##STR4## comprising subjecting phenyl fluoroacrylate to a free radical polymerization process.
Claim 9
Dependent Claim
25 words
Process for the preparation of an acrylic polymer comprising recurring units of the formula: ##STR4## comprising subjecting phenyl fluoroacrylate to a free radical polymerization process.
Claim 10
Dependent Claim
20 words
Process according to claim 5, wherein polymerization is carried out at temperatures of the order of 20° to 50° C.
Claim 11
Dependent Claim
24 words
Process according to claims 5 or 6, wherein at least one initiator is used, selected from among those active at the reaction temperatures used.
Claim 12
Dependent Claim
21 words
Process according to claim 7, wherein the polymerization is carried out in the presence of azo-bis-isobutyronitrile, as a low temperature initiator.
Claim 13
Dependent Claim
27 words
Process according to claim 7 wherein the initiator is present in an amount of at least 0.01% by weight approximately with respect to the weight of monomer.
Claim 14
Dependent Claim
17 words
Process according to claim 5, further comprising annealing the polymerization product at temperatures of about 120°-180° C.
Claim 15
Dependent Claim
26 words
Process according to claim 10, wherein the annealing is carried out by gradually increasing the temperature, and then holding the temperature constant for about 30 minutes.
Claim 16
Dependent Claim
14 words
Process according to claim 5 wherein said polymerization process comprises a bulk polymerization process.
Claim 17
Dependent Claim
18 words
Process according to claim 6 wherein, at the end of polymerization, temperature is increased to about 50°-80° C.
Claim 18
Dependent Claim
23 words
Process according to claim 9 wherein the amount of initiator is about 0.01 to 0.05% by weight based on the weight of monomer.
Claim 19
Dependent Claim
12 words
Process according to claim 10 wherein said temperature is about 150° C.
References Cited (Backward Citations)
US2571687A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |