Water immiscible porogen removal process
AssigneeRohm and Haas Company
InventorBiwang Jiang
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Abstract
The present invention relates to a method of removing water immiscible porogens from macroreticular copolymers comprising distilling said porogen in water soluble organic solvent.
Claims1
A method of removing water immiscible porogens from macroreticular copolymer beads comprising distilling said porogen in the presence of water and a water soluble organic solvent selected from the group consisting of 2-methoxyethanol, di(ethylene glycol) mono-methyl ether, di(ethylene glycol) mono-ethyl ether, di(ethylene glycol) mono-butyl ether, di(ethylene glycol) dimethyl ether, di(ethylene glycol) diethyl ether, di(ethylene glycol) ethyl ether acetate, poly(ethylene glycol) mono-methyl ether, tri(ethylene glycol), tri(ethylene glycol) mono-methyl ether, tri(ethylene glycol) mono-ethyl ether, poly(ethylene glycol) dimethyl ether, poly(ethylene glycol)-co-(propylene glycol) having a viscosity of less than 200 cps;
- 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,6-hexanediol, dimethyl sulfate and mixtures thereof.
Dependencies are inferred from the claim text.