초록 ▼

The present invention involves compositions having variable permeation and/or porosity and objects made therefrom. The compositions are prepared by dispersing a pore-forming agent in a polymer matrix by agitation. The composition is density developed resulting in a variable concentration in pore-for

The present invention involves compositions having variable permeation and/or porosity and objects made therefrom. The compositions are prepared by dispersing a pore-forming agent in a polymer matrix by agitation. The composition is density developed resulting in a variable concentration in pore-forming agent throughout the mixture through application of an external force on the mixture with or without continued agitation. The pore-forming agent is then leached from the mixture to form a polymer matrix having variable permeability and/or porosity.

대표청구항 ▼

[ We claim:] [1.]1. A method for forming permeable/porous compositions comprising the steps of:agitating a mixture comprising at least one polymer and at least one particulate pore-forming agent for a time sufficient to form pores in the mixture, where the pores have a volume greater than a volume o

[ We claim:] [1.]1. A method for forming permeable/porous compositions comprising the steps of:agitating a mixture comprising at least one polymer and at least one particulate pore-forming agent for a time sufficient to form pores in the mixture, where the pores have a volume greater than a volume of the at least one pore-forming agent; andleaching the at least one pore-forming agent from the mixture with a leaching reagent to form a polymer matrix having a void volume greater than the volume of the at least one pore-forming agent in the mixture.