Polyanhydrides with improved hydrolytic degradation properties
First Claim
1. A polyanhydride having the general formula ##STR4## wherein X is selected from the group consisting of O and CH2, n is an integer between 2 and 25, and y is at least 2, andwherein the polyanhydride is soluble in organic solvents and has a melting point of approximately 100°
- C. or less.
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Abstract
Polyanhydrides with uniform distribution of alkyl and aromatic residues are prepared by melt polycondensation or solution polymerization of p-carboxyphenoxyalkanoic acids or p-carboxyphenylalkanoic acids. These polymers are soluble in common organic solvents and have low melting points, generally in the range of 40°-100° C.
The polyanhydrides are especially well suited for forming bioerodible matrices in controlled bioactive compound delivery devices. A polymeric matrix formed according to the method described here degrades uniformly during drug release, preventing the wholescale channeling of the bioactive compound into the environment, and eliminating the problem of the presence of the polymer matrix at the site long after drug release. The polymer displays zero-order kinetic degradation profiles over various periods of time (days to months), at a rate useful for controlled drug delivery. Furthermore, a desired degradation rate may be obtained by choosing the appropriate length of the aliphatic moiety.
222 Citations
18 Claims
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1. A polyanhydride having the general formula ##STR4## wherein X is selected from the group consisting of O and CH2, n is an integer between 2 and 25, and y is at least 2, and
wherein the polyanhydride is soluble in organic solvents and has a melting point of approximately 100° - C. or less.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of preparing a controlled bioactive compound delivery device comprising
selecting monomers having both aromatic and aliphatic moieties which may be polymerized into a polyanhydride with a uniform distribution of aliphatic and aromatic residues in the polymer chain, having the general formula ##STR5## wherein X is selected from the group consisting of O and CH2, n is an integer between 2 and 25, and y is at least 2, and wherein the polyanhydride is soluble in organic solvents and has a melting point of approximately 100°
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18. A polyanhydride with the general formula ##STR7## wherein X is selected from the group consisting of O and CH2, Y is an aromatic, Z is an aliphatic having between 2 and 25 carbon molecules in the backbone, and y is at least 2, and
wherein the polyanhydride is soluble in organic solvents and has a melting point of approximately 1000° - C. or less.
Specification