the present invention relates to use of inexpensive semi - refined kappa carrageenan as a seaweed polysaccharide in preparation of tough , biodegradable films exhibiting improved performance over films obtained from refined kappa carrageenan . the formulation requires no gelling salt and the only other essential components of the film are glycerol and water , the former being used as plasticizer as reported in the prior art . the films can be recycled and reprocessed if required . the performance of the films can be further enhanced by incorporating polyvinyl alcohol that lends toughness and clarity as also natural rubber latex that imparts greater elasticity and barrier properties . films of optimum composition can be pulse heat sealed immediately after casting and used for preparation of soft capsules and pouches . it is possible to store solvents and oils in the pouches . in view of the more eco - friendly processing of semi - refined kappa carrageenan compared to refined kappa carrageenan , films made with the former would also effectively be “ greener ”.