Elastomeric controlled release formulation and article comprisin

Details Elastomeric controlled release formulation and article comprisin Elastomeric controlled release formulation and article comprisin

1985-05-01

1986-06-10

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

523102, 523122, 524712, 528 75, C08L 7504

Patent

active

045943800

ABSTRACT:
Means for the sustained release of an active agent into the environment comprise an elastomeric matrix and the active agent contained in the matrix. The matrix material has a modulus between about 10.sup.4 Pa and about 10.sup.8 Pa at 23.degree. C., and a glass transition temperature less than 0.degree. C. The matrix comprises polyurethane formed by reacting polyol and isocyanate, and the active agent can be any biologically or nonbiologically active agent that is compatible with the matrix, e.g., the insecticide 2,2' dichlorovinyl dimethyl phosphate. The inventive sustained release system has particularly advantageous release properties, e.g., it typically can release more than 70% of the active agent contained in the matrix.

REFERENCES:
patent: 3318769 (1967-05-01), Folckemer et al.
patent: 3639583 (1972-02-01), Cardarelli et al.
patent: 4094970 (1978-06-01), Behrenz
patent: 4189467 (1980-02-01), von Bittera
patent: 4267281 (1981-05-01), McCormick
Condensation Monomers, J. Wiley and Sons, 1972, Chapter V--Diisocyanates, by J. K. Stille and T. W. Campbell, pp. 369-475.

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