Abstract:
A delivery system containing an active agent within a polymeric material formed from a thermoplastic composition is provided. Through selective control over the particular nature of the thermoplastic composition, as well as the manner in which it is formed, the present inventors have discovered that a porous network can be created that contains a plurality of micropores and nanopores. The ability to create such a multimodal pore size distribution can allow the delivery rate of an active agent to be tailored for a particular use.
Abstract:
Microparticles that have a multimodal pore size distribution are provided, Notably, the pore structure of the present invention can be formed without the need for complex techniques and solvent chemistries traditionally employed to form porous microparticles. Instead, the microparticles contain a polymeric material that is formed from a thermoplastic composition, which is simply strained to a certain degree to achieve the desired porous network structure.
Abstract:
The present invention discloses water-responsive with improved stability to aqueous fluids comprising water or water vapor, processes for enhancing the stability of water-responsive compositions and processes for making such compositions. The compositions of the present invention comprise a water-responsive polymer and organically modified clay particles. In one embodiment, the water-responsive polymer is a polymer of ethylene oxide, specifically poly(ethylene oxide) and specific graft copolymers of poly(ethylene oxide). Films of the present invention are water-responsive and breathable and are especially useful for personal care applications including disposable diapers, feminine pads, pantiliners and training pants. Advantageously, compositions of the present invention have reduced melt viscosity and are more easily melt processed into films, fibers and other articles.
Abstract:
The present invention discloses filled polymer compositions having a unique porous microstructure and enhanced breathability. In one embodiment, the composition of the present invention is flushable and comprises a water-responsive polymer of ethylene oxide and unmodified clay or layered silicate composite. The compositions of the present invention are useful for manufacturing breathable and flushable films, fibers and articles. Advantageously, breathable films, fibers and articles of the present invention can be formed economically and efficiently without foaming or stretching.