Showing papers on "Polymer nanocomposite published in 1972"
Patent•
28 Jan 1972
TL;DR: In this article, an improved method for making rigid vinyl chloride polymer compounds based on polyvinyl chloride suspension resin is presented, which involves polymerizing vinyl chloride monomer in aqueous suspension in the presence of additives, as additives, of dissolved or dispersed lubricant and stabilizer and at least one other additive selected from the group consisting of dispersed pigment and dispersed polymeric polymer modifier, which additives have been added to the polymerization vessel prior to or after initiation but before termination of polymerization in amount calculated to incorporate each additive in the polymer in predetermined proportion with respect to the
Abstract: An improved method for making rigid vinyl chloride polymer compounds based on polyvinyl chloride suspension resin involves polymerizing vinyl chloride monomer in aqueous suspension in the presence, as additives, of dissolved or dispersed lubricant and stabilizer and at least one other additive selected from the group consisting of dispersed pigment and dispersed polymeric polymer modifier, which additives have been added to the polymerization vessel prior to or after initiation but before termination of the polymerization in amount calculated to incorporate each additive in the polymer in predetermined proportion with respect to the polymer, based on the amount of polymer formed at predetermined level of monomer conversion in the range of between 50 percent and 92 percent, and then short-stopping the polymerization at that predetermined level of conversion by adding a short-stopping agent, so that the lubricant, stabilizer and other additive are homogeneously incorporated into the polymer in controlled, predetermined proportions with respect to the polymeric polymer.
34 citations