a microbiocide - containing concentrate for use in thermoplastic polymers as well as in plastisols , is disclosed . the concentrate is primarily solid at ambient conditions and comprises from 1 - 30 wt % of a microbiocide , a polymer plasticizer and up to 20 wt % of a thermoplastic resin . these concentrates are primarily useful as masterbatch compositions used for incorporation into polymers in order to protect said polymers from fungal or bacterial attack . along these lines , the present document also discloses processes for incorporating these materials into a polymer or plastisol , and polymers or plastisols made by these processes .