摘要:
A vinyl chloride plastisol composition comprises 100 parts by weight of a vinyl chloride paste resin and 35 to 180 parts by weight of a plasticizer the vinyl chloride paste resin having an average particle size of 0.5 to 10 microns, and being composed of 5 to 80% by weight of tetrahydrofuran-insoluble micro-gel fraction and 20 to 95% by weight of tetrahydrofuran-soluble fraction.
摘要:
Disclosed are a deposit suppressant composition for the internal surfaces of a polymerization reactor for polymerizing a vinyl monomer, including a polyhydric phenol sulfide compound having an average molecular weight of about 500 to 5000, as well as a method of polymerizing a vinyl monomer wherein prior to the polymerization, the internal surfaces of a polymerization reactor are coated with the deposit suppressant composition.
摘要:
In a process for polymerizing vinyl chloride monomer by the polymerization of vinyl chloride alone or a mixture of vinyl chloride as a main component and a monomer copolymerizable therewith in an aqueous medium, an improvement which comprises carrying out said polymerization in the presence of a polycyclic nitrogen-containing compound of the formula, ##STR1## wherein m and n are each an integer of 1 to 3, the amount of said compound being 1 ppm to less than 100 ppm by weight based on said monomer or monomer mixture. By this process, it is possible to substantially prevent the formation of scale attached to the polymerization vessel and the like without damaging the physical properties of the produced vinyl chloride polymer.
摘要:
Disclosed are a deposit suppressant composition for the internal surfaces of a polymerization reactor for polymerizing a vinyl monomer, comprising a naphthol sulfide compound having an average molecular weight of about 500 to 5000, as well as a method of polymerizing a vinyl monomer wherein prior to the polymerization, the deposit suppressant composition is applied to the internal surfaces of a polymerization reactor or added to the reaction system.