PW 52

PW 52 by Polytechs is a high molecular weight polyisobutylene tackifier based cling masterbatch in linear low density polyethylene(LLDP). It is a dry free flowing pellet. PW 52 is used to produce stretchwrap film from LLDPE, LDPE and other polyolefins for the applications of palletwrap, silagewrap and foodwrap. It can be used on either blown film or cast film process. Polymers used with PW 52 masterbatch must not contain any antiblocking additive, slip agent, or have a density higher than 0.923, as this will prevent the migration of cling additive. Migration time for good cling properties is usually 24 to 72 hours. On monolayer blown film lines, 10% PW 52 by weight should be added to resin mix. On monolayer cast lines , 4 to 6 % PW52 should be added. On multiple-layer film lines, PW52 is usually added to the skin layers only. Addition level depends on which layer is used and the thickness of layer. Polyisobutylene is allowed by the FDA for use in contact with food ( 21 CFR 117.1430 ) and also meets the requirements of EC Directive 90/128/EEC.