a process for antibacterially finishing a polymeric substrate involving : providing a polymeric substrate made from a compound selected from the group consisting of a polyolefin , a polyester , and combinations thereof ; providing an antibacterial finish composition containing : from about 0 . 1 to 10 % by weight of at least one monoester of glycerol and a c 6 - 14 fatty acid ; and from about 0 . 01 to 10 % by weight of chitosan , all weights being based on the weight of the composition ; and applying the composition onto the polymeric substrate .