Abstract:
This disclosure relates to a novel process and to a novel product produced thereby. The product comprises a vinyl chloride polymer having an improved microporous structure and is made by a process which involves dispersing a vinyl chloride polymer latex, i.e., an aqueous suspension of a vinyl chloride polymer, in an organic liquid which is a non-solvent for the polymer, preferably removing most of the water, and heating the resulting dispersion to sinter the vinyl chloride polymer particles to form a microreticulated microporous structure. The vinyl chloride polymer latex may, for example, be a colloidal suspension of polyvinyl chloride particles in water. Such a latex may be obtained commercially or may be prepared by conventional methods. The non-solvent organic liquids should be water-miscible and should have a boiling point above 130* C. and exhibit substantially no solvating or swelling effect on the vinyl chloride polymer. The improved microporous structure of this invention is particularly useful as a filter material. The process of the invention is especially suited for the formation of shaped porous articles which are useful as filters.
Abstract:
A catalyst is provided which is remarkably effective for catalyzing the oxidation of carbon monoxide to carbon dioxide at ambient conditions. This catalyst is prepared by contacting high surface area alumina with a solution of a cobalt compound (e.g., cobalt nitrate), adsorbing the cobalt compound on the alumina, removing the solvent, and thereafter heating the cobalt-treated alumina at a temperature of 400*C to 1,300*C in an oxygenproviding environment.
Abstract:
Microporous styrene polymers are provided having randomly interconnected open network of irregularly shaped pores whose walls consist of cohered spherical particles of the polymer. These microporous styrene polymers are produced by mixing styrene polymer latex with a water-soluble ether, casting, molding, or impregnating the resulting mixture into a fibrous material, heating same to a temperature of from about 80*C to about 120*C and removing the ether.
Abstract:
This disclosure relates to a process for removal of oil from the surface of a body of water, wherein a material comprising a particulate microporous hydrophobic vinyl chloride polymer, such as polyvinyl chloride, is applied to the oil.