| 摘要 |
These controlled release non-aqueous air care gels comprise from 1 to 50 %weight basis of diblock, triblock, multiblock and/or radial block copolymers based on synthetic thermoplastic rubbers. The ratio of the diblock to triblock, multiblock and/or radial block copolymers can be varied from 0 percent to 100 percent in either direction. The material to be gelled is hydrocarbon, one or more hydrocarbon-soluble substances, or mixtures thereof, which based on its physical properties plays an important role in setting the controlled release rate. The composition of the hydrocarbon can vary in carbon length from C5 to C30 and can vary in vapor pressure up to 600 mm Hg at 20 °C. The hydrocarbon range on a weight basis is from about 20 to about 95 percent of the total weight of the gelled composition. The controlled release agent or active agent is one or more air care active substances, such as fragrances, deodorizers, masking agents, pest repellents or pesticides, and may comprise from about 0.1 to about 30 weight percent of the gel.
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