Method for impregnating a thermoplastic polymer

Coating processes – Particles – flakes – or granules coated or encapsulated – Solid encapsulation process utilizing an emulsion or...

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424 78, 424 81, 424 83, 424410, 424419, 252522A, 4283055, 4283215, 523102, 523122, 523340, 523347, 427350, A01N 1708, A01N 900, C11B 900, C08K 318

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046786848

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.

REFERENCES:
patent: 3553296 (1971-01-01), Gaeckel
patent: 3775227 (1973-11-01), Wilbert et al.
patent: 3804796 (1974-04-01), Alexandre
patent: 3876761 (1975-04-01), Shepherd
patent: 4051159 (1977-09-01), Tsouchlas et al.
patent: 4095031 (1978-06-01), Engel
patent: 4460572 (1984-07-01), Derby et al.
patent: 4515909 (1985-05-01), Sawano et al.
patent: 4521541 (1985-06-01), Rutherford et al.
Langer, et al., Polymeric Delivery Systems for Controlled Drug Release, Chem. Eng. Commun., vol. 6, pp. 1-17 (1980).
Langer, et al., Present and Future Applications of Biomaterials in Controlled Drug Delivery Systems, Biomaterials, vol. 2, pp. 201-214 (Oct. 1981).
Louis Peyron, et al., Le Dioxyde de Carbone Liquide et Supercritique (solvant d'extraction des produits naturels), Parfums, Cosmetiques, Aromes n.degree.55-fevrier-mars, pp. 27-54 (1984).
Stahl, et al., Extraction of Natural Products with the Means of Supercritical Gases, Rev. Latinoamer. Quim 11, pp. 1-7 (1980).

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