PW 70

PW 70 by Polytechs is a concentrate of medium molecular weight polyisobutylene tackifier in linear low density polyethylene. It is a cling agent. It is a dry free-flowing pellet. It is designed to produce stretch film from LLDPE, LDPE or other polyolefins for the applications of palletwrap, silagewrap and foodwrap. It can be used in both blown or cast film process. Polymers used with PW 70 must not contain any slip or antiblock additives or have a density higher than 0.923 as this will prevent the migration of the cling additive. Migration time for good cling properties is 24-72 hours. For monolayer blown films 6 % PW 70 by weight should be added to LLDPE ( or resin mix) and for monolayer cast films is 2 and 3%. It is allowed by the FDA for use in contact with food ( 21 CFR 177.1430 (a) (b[2]) (c) and 21 CFR 177.1520 (c), (3.1a)) and also meets the requirements of EU Regulation 10/2011 and its amendments.