Abstract:
Absorbent polymeric macrostructures (52) that are porous and comprise an interparticle crosslinked aggregate having a circumscribed dry volume greater than about 10.0 mm3. The interparticle crosslinked aggregate comprises a multiplicity of precursor particles of substantially water-insoluble, absorbent, hydrogel-forming, polymer material; and an interparticle crosslinking agent reacted with the polymer material of the precursor particles to form crosslink bonds between the precursor particles. Because of the particulate nature of the precursor particles, the macrostructure (52) has pores between adjacent precursor particles. The pores are interconnected by intercommunicating channels such that the macrostructure is liquid permeable.
Abstract:
A porous polymeric material has cell sizes within the range 100 to 0.5µm and total pore volume with respect to the overall volume of the material in the range 75 to 98% and includes cross-linked polycondensation polymeric material. The material can be made from a high internal phase emulsion in which the cross-linked polycondensation polymer is formed in the continuous phase. The materials are preferably open interconnected cellular structures. They can be made of a wide range of polycondensation materials. The materials are thus highly porous and light weight and have a range of properties depending primarily on their constituent polycondensation materials.
Abstract:
The present invention is a method for the preparation of porous particles that includes dissolving a polymer material in a first organic solvent and adding a second organic solvent and nonionic organic polymer particles to form an organic phase. The organic phase is dispersed in an aqueous phase that includes a particulate stabilizer to form a dispersion and the dispersion is homogenized. The first and second organic solvents are evaporated and the product is recovered.
Abstract:
PROBLEM TO BE SOLVED: To provide foam made by photopolymerizing an emulsion comprising a reactive phase and a phase immiscible with reactive phase components and closed or open cell foam depending on the microstructure of an initial emulsion. SOLUTION: The foam contains a photopolymerization initiator residue absorbing light at wavelength of 300-800 nm and is open cell foam having a dimensionally long-range macrostructure or closed cell crosslinked foam with a homogenous composition. COPYRIGHT: (C)2010,JPO&INPIT