초록 ▼

A process is disclosed for the preparation of chlorinated poly(vinyl chloride), (hereinafter “CPVC”for brevity), in the form of free-flowing macrogranules which are derived from solid free-flowing macrogranules of poly(vinyl chloride), (hereinafter “PVC”for brevity), by causing from about 0.6 to abo

A process is disclosed for the preparation of chlorinated poly(vinyl chloride), (hereinafter “CPVC”for brevity), in the form of free-flowing macrogranules which are derived from solid free-flowing macrogranules of poly(vinyl chloride), (hereinafter “PVC”for brevity), by causing from about 0.6 to about 3.0 parts by weight (wt) of liquid chlorine which are absorbed perunit wt of solid PVC macrogranules to react with the PVC, without shedding reacted material from the macrogranules. The macrogranules of PVC containing absorbed liquid chlorine held therewithin, are maintained in a wetted but free-flowing, apparently dry reaction mass (due to which the process is referred to as “the relatively dry chlorination”or “the low liquid chlorine”process), in a reaction zone maintained at a temperature in the range from about -50°C. to about 50°C., and a pressure sufficient to maintain the chlorine in its liquid state. The reaction is carried out in the presence of actinic radiation, but without swelling agents and the like. The process may be operated as a batch process, or a continuous process. The CPVC formed by the process of this invention has improved processing and working characteristics. This CPVC is distinguishable from prior art CPVC compositions by its spectral fingerprint, and by the presence of 5-15 percent by weight (% by wt) of the CPVC as glassy macrogranules. In another embodiment of the invention, a process is disclosed for simultaneously chlorinating (hence “co-chlorinating”) a free-flowing mixture of solid PVC macrogranules and solid polyethylene (“PE”) particles, without shedding reacted material from the macrogranules, to yield a mixed reaction product of separate macrogranules of CPVC and particles of chlorinated polyolefin, which mixture, in a preselected ratio of its components, may be directly used in an injection molding machine. The reaction product formed by the co-chlorination process is visually distinguishable by the characteristic coating of individual CPVC macrogranules with particles of chlorinated polyethylene (“CPE”for brevity).

대표청구항 ▼

A process for chlorinating a mass of freely flowable solid, discrete, poly(vinyl chloride) macrogranules, comprising, contacting said mass with from about 0.1 part to about 3 parts by weight of liquid chlorine per part by weight of said mass, at a temperature in the range from about -50°C. to about

A process for chlorinating a mass of freely flowable solid, discrete, poly(vinyl chloride) macrogranules, comprising, contacting said mass with from about 0.1 part to about 3 parts by weight of liquid chlorine per part by weight of said mass, at a temperature in the range from about -50°C. to about 50°C.; absorbing said liquid chlorine in said poly(vinyl chloride) macrogranules to produce liquid chlorine-containing macrogranules; agitating said liquid chlorine-containing macrogranules to maintain a reaction zone in which said mass is a free-flowing mass; irradiating said free-flowing mass of liquid chlorine-containing macrogranules with actinic radiation for a period of time sufficient for a reaction of said liquid chlorine in a solid medium, which reaction chemically bonds at least 59% by weight of chlorine with said poly(vinyl chloride) which is thus converted to chlorinated poly(vinyl chloride); removing hydrogen chloride from said reaction zone; and, recovering a free-flowing mass of macrogranules of said chlorinated poly(vinyl chloride).