US5081111A
Expired / Lapsed
US
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Controlled release preparations of active materials
Assignee: NOF Corp
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Filing: 1988-03-14
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Granted: 1992-01-14
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Expires: 2008-03-14
Abstract
Abstract A controlled release preparation of an active material comprising a reaction product obtained by reacting (a) a copolymer consisting essentially of maleic anhydride and at least one polyalkylene glycol ether represented by formula (I): ##STR1## wherein B represents a residue of a compound having from 2 to 8 hydroxyl groups; R 1 represents an alkenyl group having from 2 to 5 carbon atoms; AO represents an oxyalkylene group having from 2 to 18 carbon atoms or a combination thereof which may be linked together in blocks or at random; R 2 represents a hydrocarbon group having from 1 to 24 carbon atoms; a represents a positive integer, b and c each represents 0 or a positive integer, and a+b+c=2 to 8; l≧0, m≧0, n≧0, and e+m+n=1 to 1000; and (b) an active material. The preparation is soluble both in water and in an organic solvent and exhibits activity for a prolonged period of time.
Inventors
- 👤 Shin-ichi Akimoto
- 👤 Susumu Honda
- 👤 Tohru Yasukohchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:15
CPC Classifications
C; C08; C08F; C08F222/00; C08F222/04; C08F222/06; A; A61; A61K; A61K47/00; A61K47/50; A61K47/51; A61K47/56; A61K47/58; C08F8/00; C08F8/14; C08F8/30; C08F8/32; C08F8/42; C08F2800/00; C08F2800/10; C08F2800/20; C08F2810/00; C08F2810/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
141 words
A controlled release preparation of an active material comprising a reaction product obtained by reacting (a) a copolymer consisting essentially of maleic anhydride and at least one polyalkylene glycol ether represented by formula (I): ##STR9## wherein Z represents a residue of a compound having from 2 to 8 hydroxyl groups; R 1 represents an alkenyl group having from 2 to 5 carbon atoms; AO represents an oxyalkylene group having from 2 to 18 carbon atoms or a combination thereof which may be linked together in blocks or at random; R 2 represents a hydrocarbon group having from 1 to 24 carbon atoms; a represents a positive integer, b and c each represents 0 or a positive integer, and a+b+c=2 to 8; 1≧0, m≧0, n≧0, and l+m+n=1 to 1000; and (b) and active material having a hydroxyl group or an amino group.
Claim 2
Dependent Claim
141 words
A controlled release preparation of an active material comprising a reaction product obtained by reacting (a) a copolymer consisting essentially of maleic anhydride and at least one polyalkylene glycol ether represented by formula (I): ##STR9## wherein Z represents a residue of a compound having from 2 to 8 hydroxyl groups; R 1 represents an alkenyl group having from 2 to 5 carbon atoms; AO represents an oxyalkylene group having from 2 to 18 carbon atoms or a combination thereof which may be linked together in blocks or at random; R 2 represents a hydrocarbon group having from 1 to 24 carbon atoms; a represents a positive integer, b and c each represents 0 or a positive integer, and a+b+c=2 to 8; 1≧0, m≧0, n≧0, and l+m+n=1 to 1000; and (b) and active material having a hydroxyl group or an amino group.
Claim 3
Dependent Claim
41 words
A controlled release preparation of an active material as claimed in claim 1, wherein said copolymer further comprises at least one member selected from the group consisting of styrene, methylstyrene, vinyl chloride, vinylidene chloride, isobutylene, diisobutylene, vinyl acetate, acrylonitrile, and acrylamide.
Claim 4
Dependent Claim
37 words
A controlled release preparation of an active material as claimed in claim 1, wherein said active material having a hydroxyl group is a perfume, a growth regulating substance, a pheromone, a hormone, a vitamin or a glycoside.
Claim 5
Dependent Claim
28 words
A controlled release preparation of an active material as claimed in claim 3, wherein said perfume is linalool, geraniol, citronellol, eugenol, benzyl alcohol, phenethyl alcohol or cinnamic alcohol.
Claim 6
Dependent Claim
30 words
A controlled release preparation of an active material as claimed in claim 1, wherein Z represents a residue of a compound having 2 hydroxyl groups and a=1, b=1 and c=0.
Claim 7
Dependent Claim
22 words
A controlled release preparation of an active material as claimed in claim 3, wherein said compound having a hydroxyl group is perfume.
Claim 8
Dependent Claim
19 words
A controlled release preparation of an active material as claimed in claim 4, wherein said perfume is phenethyl alcohol.
References Cited (Backward Citations)
US4664847A
Cited
US4435524A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-13 | 1995-07-15 | 1996-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-13 | 1999-07-15 | 2000-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-13 | 2003-07-15 | 2004-01-14 | $7700.00 | Window Closed / Lapsed |