发明授权
US4891388A Solid gel dispensers for achieving controlled release of volatile liquid materials and method for preparing same 失效
用于实现挥发性液体材料的控制释放的固体凝胶分配器及其制备方法

Solid gel dispensers for achieving controlled release of volatile liquid
materials and method for preparing same
摘要:
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.
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