Process for continuously preparing acrylic polymer gel
AssigneeDai-Ichi Kogyo Seiyaku Co., Ltd.
InventorsAkira Yada, Shusaku Matsumoto
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Abstract
A process for continuously and stably preparing an acrylic polymer of a high quality in a high conversion and a high productivity which comprises continuously feeding a synthetic resin film onto a moving support, continuously feeding a monomer or a monomer solution onto the synthetic resin film on the moving support in the form of a thin layer, irradiating a light energy to the thin layer, continuously feeding another synthetic resin film over the thin layer and bringing it into close contact with the thin layer when the thin layer has become substantially nonflowable state, and continuing the irradiation of light energy to produce the polymer.
Claims7
A process for continuously preparing an acrylic polymer gel using a photopolymerization apparatus including a movable support and a gas tight chamber having a light permeable upper part which comprises:
- (a) decreasing the dissolved oxygen in a monomer solution of at least one acrylic monomer containing a photopolymerization initiator to at most 1 mg/liter,
- (b) maintaining the concentration of oxygen in the gas phase inside a gas tight chamber arranged over a moving support at not more than 1% by volume,
- (c) continuously feeding a synthetic resin film onto the moving support from one end of the moving support,
- (d) continuously feeding the monomer solution in the form of a thin layer onto the resin film on the moving support,
- (e) irradiating the layer of the monomer solution with a light energy to initiate the polymerization and to cause the monomer solution to become substantially nonflowable,
- (f) continuously feeding a synthetic resin film and bringing the resin film into contact with the upper surface of the layer of the monomer solution when the monomer solution has become substantially nonflowable,
- (g) continuing the polymerization by the irradiation of light energy to produce a polymer in the form of gel, and
- (h) continuously peeling off the resin films on the both sides of the produced sheet-like polymer at the other end of the moving support and continuously taking out the sheet-like polymer from the moving support.
Dependencies are inferred from the claim text.