Solid gel dispensers for achieving controlled release of volatil

Details Solid gel dispensers for achieving controlled release of volatil Solid gel dispensers for achieving controlled release of volatil

1989-06-14

1990-01-02

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 82, 521 88, 521 89, 521141, C08J 928

Patent

active

048913880

ABSTRACT:
Aesthetically attractive, free standing dispensers for the controlled release of volatile liquid materials such as perfumes and fragrances into the atmosphere are prepared by (1) forming a first solution by heating a mixture comprising polyvinyl alcohol and water and/or dimethyl sulfoxide under atmospheric pressure, (2) adding a second solution comprising a volatile liquid material and a monohydric alcohol in a solvent that is miscible with the first solution under conditions that avoid precipitation of polyvinyl alcohol, and then (3) cooling the resultant solution to below room temperature to form a gel in the shape of the final dispenser. The exterior surfaces of the dispenser remainds dry to the touch throughout its useful life.

REFERENCES:
patent: 4094119 (1978-06-01), Sullivan
patent: 4117110 (1978-09-01), Horst
patent: 4356969 (1982-11-01), Obermayer et al.
patent: 4587129 (1986-05-01), Kliment
patent: 4594380 (1986-06-01), Chapin et al.
patent: 4663358 (1987-05-01), Hyon et al.
patent: 4719040 (1988-01-01), Traas et al.
patent: 4720409 (1988-01-01), Spector

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