Composition and procedure for obtaining a film of micro porous thermoplastic polymer that is especially suited to the production of personal hygiene articles such as diapers and sanitary towels

摘要

The present invention consists in a method and a composition for obtaining films of a thermoplastic polymer, preferably polyethylene, that are non-breathable and heavily charged with treated mineral particles in order to leave hollow spaces in the structure thereof, resulting in a significant reduction in density.;Owing to the fact that said films exhibit improved stability to the stresses they undergo during processing in diaper-production machines, and because, furthermore, they offer an important saving in terms of costs owing to the high mineral-filler content thereof and the low density thereof, they are especially suited to use as an outer covering for disposable diapers and sanitary towels.

主权项

1. A non-breathable film obtained by extrusion comprising a base polymer dosed in a mass proportion between 30% and 70% by weight, loaded with mineral particles dosed in a mass proportion between 70% and 30% by weight covered by a fatty acid in a mass proportion between 0.1% and 0.5% by weight with regard to the mineral particles, and partially adhered to the base polymer by means of an adhesive formed from co-polymers of the base polymer grafted with polar groups comprising maleic anhydride or acrylic add, dosed in a mass proportion between 1% and 5% by weight,
wherein the average size of the mineral particles is between 0.5 and 4 microns, and wherein said film has a micro-porous structure with a pore size of between 0.2 and 5 microns and the pores are not joined to each other, wherein the base polymer is a polyolefin selected from the group consisting of polypropylene, high density polyethylene, medium density polyethylene, and low density polyethylene.