Compositions for the direct obtained from expanded, calendered or laminated films, process for the preparation of these films and films produced therefrom

摘要

Formulation for the production of sheets of expanded, calendered or laminated, comprising: (a) at least one polymer matrix is selected from polyvinyl chlorides (pvc) obtained by polymerization in bulk or in suspension having a value of k ranging from 50 to 90 and preferably of between 57 and 65, the chlorinated pvc having a viscosity index, measured according to the standard iso r 174 (nft 51 - 013) ranging from 60 to 200 cm3 / g; and (b) at least one expansion agent consisting of polymeric microspheres containing a liquid or an expansible gas, for example of the microspheres in the thermoplastic polymer, for example acrylic, filled with isopentane.