FUNGICIDAL AND BACTERIOSTATIC CHEMICAL ADDITIVES OF EXCELLENT BIOCIDAL POWER, COMPRISING UNDECYLENIC ACID ALKYLOLAMIDES INCLUDING UNDECYLENIC ACID MONOALKYLOLAMIDE, UNDECYLENIC ACID DIALKYLOLAMINES, UNDECYLENIC ACID POLYALKYLOLMIDES, THE SALTS OF THE SULPHOSUCCINIC ACID HALF ESTERS OF THE AFORESAID UNDECYLENIC ACID ALKYLOLAMIDES AND THE OXYETHYLATED AND/OR OXYPROPYLLATED DERIVATIVES OF SAID SALTS AND SAID UNDICYLENIC ACID ALKYLOLAMIDES WHICH FIND IMMEDIATE AND PRACTICAL APPLICATION AS ADDITIV...