Alcohol soluble hydrophilic polymer via aqueous polymerization
OwnerRobert A. Abrahamsinventor
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Abstract
Hydrophilic, water insoluble, organic solvent soluble polymers of hydroxyalkyl methacrylate or acrylate of high purity are prepared in water using hydroxyalkyl methacrylate or acrylate monomer having not over 0.035 weight percent of alkylene glycol dimethacrylate or diacrylate. The polymers have high molecular weight and narrow molecular weight distribution and are useful for medical applications, e.g., as a burn dressing.
Claims16
A process for preparing a solid waterinsoluble, methanol-soluble hydrophilic polymer which consists essentially of polymerizing in water, monomers consisting essentially of (a) a monomer of the formula ##EQU4## where R is an alkylene group of 2 to 3 carbon atoms, and wherein R' is hydrogen or methyl;
- with not more than 0.035 weight percent, based on the weight of said monomer of formula (1), of a diester of the formula ##EQU5## wherein R and R' have the above meanings or (b) said monomers of formula (1) and formula (2) together with a third monomer in an amount as high as 10%, said third monomer being methacrylic acid or ##EQU6## initiating polymerization by irradiation or a free radical initiator employing a ratio of total monomer to water from 10:90 to 70:30, conducting the polymerization for a period of time sufficient to produce said polymer, and recovering said polymer from the resulting reaction product mixture.
Dependencies are inferred from the claim text.