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US4136252A
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Polymeric orthoesters having arylene arrangement
Assignee: Alza Corp
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Filing: 1977-09-28
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Granted: 1979-01-23
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Expires: 1997-09-28
Abstract
Abstract This invention concerns polymeric orthoesters having a repeating mer comprising a hydrocarbon radical and an orthoester functionality of the general formula: ##STR1## WHEREIN R 1 is a monovalent radical, R 2 is a hydrocarbon radica, a is 2 to 3, and n is at least 10. The polymers are useful for making articles of manufacture and as coatings for beneficial agents.
Inventors
- 👤 Richard C. Capozza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:34
CPC Classifications
C; C08; C08G; C08G4/00; C08G65/00; C08G65/34
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
42 words
A polymer of the general formula: ##STR55## wherein R 1 is a member selected from the group consisting of hydrogen, alkyl, alkenyl, cycloaklyl, cycloalkenyl, aryl, and aralkylene, R 2 is arylene, a is 2 to 3 and n is greater than 10.
Claim 2
Dependent Claim
42 words
A polymer of the general formula: ##STR55## wherein R 1 is a member selected from the group consisting of hydrogen, alkyl, alkenyl, cycloaklyl, cycloalkenyl, aryl, and aralkylene, R 2 is arylene, a is 2 to 3 and n is greater than 10.
Claim 3
Dependent Claim
67 words
The polymer according to the formula of claim 1, wherein R 1 is a member selected from the group consisting of alkyl of 1 to 20 carbon atoms, alkenyl of 2 to 20 carbon atoms, cycloalkyl of 3 to 8 carbon atoms, cycloalkenyl of 4 to 8 carbon atoms, aryl of 6 to 36 carbon atoms, and R 2 is arylene of 6 to 36 carbon atoms.
Claim 4
Dependent Claim
44 words
The polymer according to claim 2, wherein R 1 is a cycloalkyl substituted with a member selected from the group consisting of alkyl of 1 to 20 carbon atoms, alkenyl of 2 to 20 carbon atoms and alkoxy of 1 to 20 carbon atoms.
Claim 5
Dependent Claim
43 words
The polymer according to claim 2, wherein R 1 cycloalkenyl is substituted with a member selected from the group consisting of alkyl of 1 to 20 carbon atoms, alkenyl of 2 to 20 carbon atoms, and alkoxy of 1 to 20 carbon atoms.
Claim 6
Dependent Claim
43 words
The polymer according to claim 2, wherein R 1 aryl is substituted with a member selected from the group consisting of alkyl of 1 to 20 carbon atoms, alkenyl of 2 to 20 carbon atoms and alkoxy of 1 to 20 carbon atoms.
Claim 7
Dependent Claim
21 words
The polymer according to claim 2, wherein R 1 is an aralkylene selected from the group consisting of benzyl and phenyethylene.
Claim 8
Dependent Claim
46 words
The polymer according to claim 2, wherein R 2 is an arylene selected from the group consisting of phenylene and phenylene substituted with an alkyl of 1 to 20 carbon atoms, alkenyl of 2 to 20 carbon atoms and alkoxy of 1 to 20 carbon atoms.
Claim 9
Dependent Claim
13 words
The polymer according to claim 2, wherein R 2 arylene is a dialkylenearylene.
Claim 10
Dependent Claim
15 words
The polymer according to the formula of claim 1, wherein n is 10 to 100,000.
Claim 11
Dependent Claim
11 words
The polymer according to claim 1, wherein R 1 is phenyl.
Claim 12
Dependent Claim
17 words
The polymer according to claim 1 of the following formula, wherein n is greater than 10: ##STR56##
Claim 13
Dependent Claim
17 words
The polymer according to claim 1 of the following formula, wherein n is greater than 10: ##STR57##
Claim 14
Dependent Claim
17 words
The polymer according to claim 1 of the following formula, wherein n is greater than 10: ##STR58##
Claim 15
Dependent Claim
17 words
The polymer according to claim 1 of the folowing formula, wherein n is greater than 10: ##STR59##
Claim 16
Dependent Claim
17 words
The polymer according to claim 1 of the following formula, wherein n is greater than 10: ##STR60##
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) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |