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An active agent delivery device comprises (a) microporous material comprising a matrix consisting essentially of linear ultrahigh molecular weight polyolefin, a large proportion of finely divided water-insoluble filler of which at least about 50 percent by weight is siliceous, and interconnecting po

An active agent delivery device comprises (a) microporous material comprising a matrix consisting essentially of linear ultrahigh molecular weight polyolefin, a large proportion of finely divided water-insoluble filler of which at least about 50 percent by weight is siliceous, and interconnecting pores; and (b) a releasable active agent or precursor thereof associated with at least a portion of the filler.

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1. An active agent delivery device which releases active agent over a prolonged period of time comprising: (a) microporous material comprising: (1) a matrix consisting essentially of essentially linear ultrahigh molecular weight polyethylene having an intrinsic viscosity of at least about 18 de

1. An active agent delivery device which releases active agent over a prolonged period of time comprising: (a) microporous material comprising: (1) a matrix consisting essentially of essentially linear ultrahigh molecular weight polyethylene having an intrinsic viscosity of at least about 18 deciliters/gram, (2) finely divided particulate substantially water-insoluble filler, of which at least about 50 percent by weight is siliceous, distributed throughout said matrix, said filler constituting from about 50 percent to about 90 percent by weight of said microporous material, and (3) a network of interconnecting pores communicating throughout said microporous material, said pores constituting more than 35 percent by volume of said microporous material. (b) a releasable fragrance, flavor, or precursor thereof associated with at least a portion of said filler. 2. The active agent delivery device of claim 1 wherein said microporous material has been printed. 3. An active agent delivery device which releases active agent over a prolonged period of time comprising: (a) microporous material comprising: (1) a matrix consisting essentially of essentially linear ultrahigh molecular weight polyethylene having an intrinsic viscosity of at least about 18 deciliters/gram, (2) finely divided particulate substantially water-insoluble filler, of which at least about 50 percent by weight is siliceous, distributed throughout said matrix, said filler constituting from about 50 percent to about 90 percent by weight of said microporous material, and (3) a network of interconnecting pores communicating throughout said microporous material, said pores constituting more than 35 percent by volume of said microporous material. (b) a releasable biocide or precursor thereof associated with at least a portion of said filler. 4. An active agent delivery device which releases active agent over a prolonged period of time comprising: (a) microporous material comprising: (1) a matrix consisting essentially of essentially linear ultrahigh molecular weight polyethylene having an intrinsic viscosity of at least about 18 deciliters/gram, (2) finely divided particulate substantially water-insoluble filler, of which at least about 50 percent by weight is siliceous, distributed throughout said matrix, said filler constituting from about 50 percent to about 90 percent by weight of said microporous material, and (3) a network of interconnecting pores communicating throughout said microporous material, said pores constituting more than 35 percent by volume of said microporous material. (b) a releasable pheromone, other attractant, or precursor thereof associated with at least a portion of said filler. 5. An active agent delivery device which releases active agent over a prolonged period of time comprising: (a) microporous material comprising: (1) a matrix consisting essentially of essentially linear ultrahigh molecular weight polyethylene having an intrinsic viscosity of at least about 18 deciliters/gram, (2) finely divided particulate substantially water-insoluble filler, of which at least about 50 percent by weight is siliceous, distributed throughout said matrix, said filler constituting from about 50 percent to about 90 percent by weight of said microporous material, and (3) a network of interconnecting pores communicating throughout said microporous material, said pores constituting more than 35 percent by volume of said microporous material. (b) a releasable antistatic agent or precursor thereof associated with at least a portion of said filler.