POLYSAR IN JOINT VENTURE ON FINLAND LATEX PLANT Polysar Ltd, wholly owned by <Canada Development Corp>, said it agreed to form a joint venture with Raision Tehtaat, of Finland, to build a synthetic rubber latex plant in southern Finland. Project cost and plant capacity were not disclosed. The joint venture, to be 51 pct owned by Raision Tehtaat and 49 pct by Polysar, will build a plant at Anjalankoski, east of Helsinki, to produce carboxylated styrene-butadiene latex. The plant's production will be used by Finland's paper industry for making coated paper and paper board products.