Abstract: A method of manufacturing containers covered tightly with a protective sheet with a porous resin film layer or rubber film layer in-between.By the method of this invention, a resin solution or rubber solution is foamed mechanically in advance and the foamed layer made by the foamed resin film or the foamed rubber film then is covered with a heat shrinkable sheet which is heat shrunk tightly to the containers. The foamed layer does not shrink during the heating. Accordingly, the surface of the heat shrinkable sheet is free from waviness due to gas foaming of the covered layer during heat shrinking which has been the case with conventional methods. The method, therefore, does not affect the appearance or printing performance of the surface of the heat shrinkable sheet.

Abstract: Polymer or copolymer of vinyl chloride having superior properties can be produced by suspension-polymerizing vinyl chloride or a mixture thereof with another vinyl monomer, at first, in the presence of an oil-soluble radical initiator, and thereafter, when the percentage of polymerization of the resulting polymer has reached about 15% to about 80%, subjecting the polymer to a further polymerization in the presence of a water-soluble radical initiator.The product thus obtained has both the merits resulting from suspension polymerization and emulsion one. It has an extremely high absorptivity of plasticizer, easy processability, and film made therefrom has substantially no fish eye.