Process for preparing vinyl chloride polymer under specified vap

Details Process for preparing vinyl chloride polymer under specified vap Process for preparing vinyl chloride polymer under specified vap

1996-06-28

1998-04-14

Henderson, Christopher

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 79, 526202, 526228, C08F 220, C08F 438

Patent

active

057392226

ABSTRACT:
A vinyl chloride polymer is prepared through suspension polymerization of a vinyl chloride monomer in the presence of a polymerization initiator in a reactor. The reactor is charged with up to 4/5 of the overall monomer charge to initiate polymerization. Polymerization is carried out under a certain saturated vapor pressure of P1 kgf/cm.sup.2 at a preset polymerization temperature. When the internal pressure of the reactor declines to P2 kgf/cm.sup.2, the remainder of the overall monomer charge is continuously fed to the reactor so as to maintain the internal pressure within the range of (P1-.DELTA.P) wherein .DELTA.P=P1-P2 ranges from 0.1 to 2.0 kgf/cm.sup.2. A vinyl chloride polymer having a high degree of polymerization is efficiently produced while alleviating the load of heat removal.

REFERENCES:
patent: 3451985 (1969-06-01), Mahlo
patent: 4914169 (1990-04-01), Suyama
patent: 5420215 (1995-05-01), Amano

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