US3870702A
Expired / Lapsed
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Cellulose ether compositions useful as enteric coatings
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1973-11-09
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Granted: 1975-03-11
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Expires: 1993-11-09
Abstract
Abstract Tetrahydrophthalic acid monoester or hexahydrophthalic acid monoester of a cellulose ether represented by the general formula:
Inventors
- 👤 Shunichi Koyanagi
- 👤 Kinya Ogawa
- 👤 Yoshiro Onda
- 👤 Akira Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:26
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/28; A61K9/2806; A61K9/2833; A61K9/286; A61K9/2866; A61K9/48; A61K9/50; A61K9/5005; A61K9/5021; A61K9/5036; A61K9/5042; C; C08; C08B; C08B13/00
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
84 words
A coating composition consisting essentially of a solution of an organic solvent and at least one monoester selected from the group consisting of a tetrahydrophthalic acid monoester and hexahydrophthalic acid monoester of a cellulose ether represented by the general formula R1mR2nA wherein R1 is a hydroxyl alkyl radical having three to four carbon atoms, R2 is selected from the group consisting of hydrogen and alkyl radicals of one to two carbon atoms, m and n are positive integers, and A is a cellulose residue.
Claim 2
Dependent Claim
84 words
A coating composition consisting essentially of a solution of an organic solvent and at least one monoester selected from the group consisting of a tetrahydrophthalic acid monoester and hexahydrophthalic acid monoester of a cellulose ether represented by the general formula R1mR2nA wherein R1 is a hydroxyl alkyl radical having three to four carbon atoms, R2 is selected from the group consisting of hydrogen and alkyl radicals of one to two carbon atoms, m and n are positive integers, and A is a cellulose residue.
Claim 3
Dependent Claim
40 words
A COATING COMPOSITION CONSISTING ESSENTIALLY OF A SOLUTION OF AN ORGANIC SOLVENT AND AT LEAST ONE MONOESTER SELETED FROM THE GROUP CONSISTING OF A TETRAHYDROPHTHALIC ACID MONOESTER AND HEXAHYDROPHTHALIC ACID MONOESTER OF A CELLULOSE ETHER REPRESENTED BY THE GENERAL FORMULA
Claim 4
Dependent Claim
40 words
A COATING COMPOSITION CONSISTING ESSENTIALLY OF A SOLUTION OF AN ORGANIC SOLVENT AND AT LEAST ONE MONOESTER SELETED FROM THE GROUP CONSISTING OF A TETRAHYDROPHTHALIC ACID MONOESTER AND HEXAHYDROPHTHALIC ACID MONOESTER OF A CELLULOSE ETHER REPRESENTED BY THE GENERAL FORMULA
Claim 5
Dependent Claim
40 words
The composition of claim 1, wherein R1 in said general formula is a hydroxyalkyl radical, the number of the substitution moles per anhydrous glucose unit of which is from 0.2 to 5.0, and R2 in said general formula is hydrogen.
Claim 6
Dependent Claim
27 words
The composition of claim 1, wherein said cellulose ether is selected from the group consisting of hydroxypropyl cellulose, hydroxybutyl methylcellulose, hydroxypropyl methylcellulose, hydroxybutyl cellulose, and hydroxypropyl ethylcellulose.
Claim 7
Dependent Claim
16 words
The compostion of claim 1, wherein said monoester is a hexahydrophthalic acid monoester of hydroxypropyl cellulose.
Claim 8
Dependent Claim
16 words
The composition of claim 1, wherein said monoester is a tetrahydrophthalic acid monoester of hydroxypropyl cellulose.
Claim 9
Dependent Claim
16 words
The composition of claim 1, wherein said monoester is a tetrahydrophthalic acid monoester of hydroxypropyl methylcellulose.
Claim 10
Dependent Claim
16 words
The composition of claim 1, wherein the monoester is a tetrahydrophthalic acid monoester of hydroxybutyl methylcellulose.
Claim 11
Dependent Claim
52 words
The composition of claim 1, wherein said organic solvent is selected from the group consisting of methyl alcohol, ethyl alcohol, isopropyl alcohol, methyl cellosolve, ethyl cellosolve, dioxane, diethyl ether, acetone, methyl ethyl ketone, diacetylene alcohol, benzene, toluene, methyl lactate, methyl acetate, ethyl acetate, methylene chloride, trichloroethylene, methyl chlorOform, chloroform, and ethylene chloride.
Claim 12
Dependent Claim
20 words
The coating composition of claim 1 wherein the composition consists essentially of said organic solvent and 10-20% of said monoester.
Claim 13
Dependent Claim
82 words
A coating composition consisting essentially of a solution of an organic solvent and a mixed ester of tetrahydrophthalic acid or hexahydrophthalic acid and another dibasic acid or tribasic acid of a cellulose ether represented by the general formula R1mR2nA wherein R1 is a hydroxyl alkyl radical having three to four carbon atoms, R2 is selected from the group consisting of hydrogen and alkyl radicals of one to two carbon atoms, m and n are positive integers, and A is a cellulose residue.
Claim 14
Dependent Claim
82 words
A coating composition consisting essentially of a solution of an organic solvent and a mixed ester of tetrahydrophthalic acid or hexahydrophthalic acid and another dibasic acid or tribasic acid of a cellulose ether represented by the general formula R1mR2nA wherein R1 is a hydroxyl alkyl radical having three to four carbon atoms, R2 is selected from the group consisting of hydrogen and alkyl radicals of one to two carbon atoms, m and n are positive integers, and A is a cellulose residue.
Claim 15
Dependent Claim
63 words
The composition of claim 10, wherein R1 in said general formula is a hydroxyalkyl radical, the number of the substitution moles per anhydrous glucose unit of which is at least 0.2, and R2 in said general formula is an alkyl radical, the total number of the substitution moles per anhydrous glucose unit of said hydroxyalkyl and alkyl radicals being from 0.5 to 5.0.
Claim 16
Dependent Claim
27 words
The composition of claim 10, wherein said cellulose ether is selected from the group consisting of hydroxypropyl cellulose, hydroxybutyl methylcellulose, hydroxypropyl methylcellulose, hydroxybutyl cellulose, and hydroxypropyl ethylcellulose.
Claim 17
Dependent Claim
21 words
The composition of claim 10, wherein said dibasic acid is selected from the group consisting of phthalic acid and succinic acid.
Claim 18
Dependent Claim
13 words
The composition of claim 10, wherein said tribasic acid is a trimellitic acid.
Claim 19
Dependent Claim
23 words
The composition of claimed in claim 10, wherein the mixed ester is mixed ester of tetrahydrophthalic acid and succinic acid of hydroxypropyl methylcellulose.
Claim 20
Dependent Claim
23 words
The composition of claimed in claim 10, wherein the mixed ester is mixed ester of hexahydrophthalic acid and phthalic acid of hydroxypropyl methylcellulose.
Claim 21
Dependent Claim
23 words
The composition of claimed in claim 10, wherein the mixed ester is mixed ester of hexahydrophthalic acid and trimellitic acid of hydroxypropyl methylcellulose.
Claim 22
Dependent Claim
52 words
The composition of claim 10, wherein said organic solvent is selected from the group consisting of methyl alcohol, ethyl alcohol, isopropyl alcohol, methyl cellosolve, ethyl cellosolve, dioxane, diethyl ether, acetone, methyl ethyl ketone, diacetylene alcohol, benzene, toluene, methyl lactate, methyl acetate, ethyl acetate, methylene chloride, trichloroethylene, methyl chloroform, chloroform, and ethylene chloride.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |