| abstract |
Bodies which are formed compositions of Versalon TM type polyamide resin containing from about 35% up to about 70% by weight of highly volatile materials such as perfumes, odorants, insecticides, bactericides, and animal repellents which are able to act in a very diluted vapor state in the air for relatively long periods of time, are described. The highly volatile substances are released in a controlled manner over a long period of time. The molecular weight of the resin is between 9,000 and 12,000, and its softening point varies from 120 DEG C. up to 400 DEG C. In addition, articles are described incorporating said composition and, as part of the instant invention, a light bulb coated with a toroidal article which consists essentially of said composition, is included. The method of our invention comprises heating Versalon TM polyamide resin (Note 1) having a molecular weight of from 9,000 up to 12,000 until it is pourable and stirrable, e.g., to a temperature of between 120 DEG C. and 400 DEG C., and then blending from 35 up to 70% of a highly volatile ingredient such as a perfume oil, an insecticide composition, a bactericide composition, or an animal repellent composition, into the melt until a uniform mixture is obtained, and cooling the mixture to solidify it as such or in a toroidal state, preferably rapidly as by quenching in cold water. The product so obtained is then formed into an article such as a coating on a substrate such as an electric light bulb. Alternatively, one or more volatile ingredients are blended into the resin in the feed line of a molding machine in which the resin bodies containing said volatile ingredients are fashioned directly. Note 1: Versalon TM is a trademark of the General Mills Corporation of Minneapolis, Minnesota. |