Liquid active substance slow releasing device

Details Liquid active substance slow releasing device Liquid active substance slow releasing device

1988-11-10

1990-05-15

Van Balen, William J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

116200, 424 71, 4283155, 4283159, 4283191, 4283193, 428905, 428907, G01N 2117, B32B 326

Patent

active

049257307

ABSTRACT:
A liquid active substance slow releasing device comprising a thermoplastic polyester resin having a glass transition point of from 5.degree. C. to 80.degree. C. and an evaporative liquid active substance having a limited solubility for the aforesaid thermoplastic resin, said device being an opaque resin molding of the thermoplastic resin having dispersed therein the liquid active substance as fine droplets in an amount over the saturation solubility and becoming substantially transparent when the amount of the liquid active substance in the resin molding is reduced.

REFERENCES:
patent: 3784488 (1974-01-01), Steinhauer et al.
patent: 4017030 (1977-04-01), Coplan et al.
patent: 4051159 (1977-09-01), Tsoucalos et al.
patent: 4138344 (1979-02-01), Choi et al.
patent: 4279213 (1981-07-01), Urahama et al.
patent: 4286020 (1981-08-01), Himel et al.
patent: 4734278 (1988-03-01), Pougalan et al.
patent: 4735972 (1988-04-01), Shigematsu et al.
European Search Report, EP 88 11 8762.

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