Apparatus for anionic polymerization wherein the molecular weight of the polymer is closely controlled

An apparatus for the preparation of anionically polymerized polymers, the apparatus comprising in cooperative combination a monomer supply means, a monomer flow control means associated with a discharge of the monomer supply means, an anionic polymerization initiator supply means, an initiator flow control means in association with a discharge of the initiator supply means, a continuously stirred tank reactor having an inlet and an outlet, the inlet of the continuously stirred tank reactor being in operative communication with the monomer flow control means and the initiator flow control means and adapted to receive material therefrom;

• a conduit connected to the discharge of the continuously stirred tank reactor, the conduit being in operative communication with an optical means in combination with a control means, the optical means providing a first signal which varies as molecular weight of polymer in effluent from the continuously stirred tank reactor varies, the first signal passing to the control means which is connected to the initiator flow control means so as to adjust the initiator flow control means to thereby provide molecular weight control of a polymer being prepared, a gel permeation chromatograph positioned and arranged with respect to the conduit and the control means so as to receive effluent from the continuously stirred reactor and measure the molecular weight of a polymer and provide a second signal indicative of the molecular weight of the polymer to the control means to adjust the optical means to provide a desired first signal to thereby provide a polymer of a generally uniform molecular weight.