Cellulose ether compositions useful as enteric coatings
阅读：927发布：2023-03-10
专利汇可以提供Cellulose ether compositions useful as enteric coatings专利检索，专利查询，专利分析的服务。并且Tetrahydrophthalic acid monoester or hexahydrophthalic acid monoester of a cellulose ether represented by the general formula:，下面是Cellulose ether compositions useful as enteric coatings专利的具体信息内容。
1. 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.
1. 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
2. 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.
3. 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.
4. The compostion of claim 1, wherein said monoester is a hexahydrophthalic acid monoester of hydroxypropyl cellulose.
5. The composition of claim 1, wherein said monoester is a tetrahydrophthalic acid monoester of hydroxypropyl cellulose.
6. The composition of claim 1, wherein said monoester is a tetrahydrophthalic acid monoester of hydroxypropyl methylcellulose.
7. The composition of claim 1, wherein the monoester is a tetrahydrophthalic acid monoester of hydroxybutyl methylcellulose.
8. 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.
9. The coating composition of claim 1 wherein the composition consists essentially of said organic solvent and 10-20% of said monoester.
10. 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.
11. 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.
12. 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.
13. The composition of claim 10, wherein said dibasic acid is selected from the group consisting of phthalic acid and succinic acid.
14. The composition of claim 10, wherein said tribasic acid is a trimellitic acid.
15. The composition of claimed in claim 10, wherein the mixed ester is mixed ester of tetrahydrophthalic acid and succinic acid of hydroxypropyl methylcellulose.
16. The composition of claimed in claim 10, wherein the mixed ester is mixed ester of hexahydrophthalic acid and phthalic acid of hydroxypropyl methylcellulose.
17. The composition of claimed in claim 10, wherein the mixed ester is mixed ester of hexahydrophthalic acid and trimellitic acid of hydroxypropyl methylcellulose.
18. 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.
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