Drug – bio-affecting and body treating compositions – Lymphokine
Patent
1985-05-02
1986-07-01
Lilling, Herbert J.
Drug, bio-affecting and body treating compositions
Lymphokine
424 78, 424 83, 523102, 523340, 523347, A01N 1708, A01N 900, C11B 900, C08K 318
Patent
active
045980063
ABSTRACT:
Disclosed is a method for impregnating a thermoplastic polymer with an impregnation material such as a fragrance or pest control agent or pharmaceutical composition. A thermoplastic polymer is impregnated by (1) dissolving an impregnation material such as a fragrance or pest control agent or pharmaceutical composition material in a volatile swelling agent maintained at or near supercritical conditions for the volatile swelling agent, (2) swelling the thermoplastic polymer by contacting it at or near supercritical conditions for the volatile swelling agent with the impregnation material-laden volatile swelling agent and then (3) reducing the pressure so that the volatile swelling agent diffuses out of the thus impregnated thermoplastic polymer.
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Hercules Incorporated
Lilling Herbert J.
Lovercheck Dale R.
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