Patent ID: 6187869
Filing Date: 2001-02-13
Classification: C08L

Abstract:
A method for reducing surface tack which comprises using a modifier selected from the following classes of materials:a) high-pressure uncatalyzed ethylene homopolymers or ethylene-higher-x-olefin copolymers with a proportion of more than 90 mol % of ethylene and with a density of not more than 0.92 g/cm.sup.3 (LDPE),b) low-pressure catalyzed ethylene-higher-.alpha.-olefin copolymers with a proportion of more than 75 mol % of ethylene and with a density of not more than 0.93 g/cm.sup.3 (LLDPE), andc) highly amorphous olefin elastomers with an enthalpy of fusion of not more than 15 J/g, composed of copolymers of ethylene and propylene (EPR) or of terpolymers of ethylene, propylene and dienes (EPDM) having a density of not more than 0.88 9/cm.sup.3, or else mixtures of these olefin elastomers with polyethylenes or with isotactic polypropylenes, where the proportion of the olefin elastomer by weight is in each case more than 50%,as a component for adding to a highly amorphous polypropylene (base polymer) with an enthalpy of fusion of not more than 40 J/g and a melt flow index of from 0.1 to 50 g/10 min, where the highly amorphous polypropylene is a homopolymer of propylene or a copolymer of propylene with one or more .alpha.-olefins and has a proportion of at least 80 mol % of propylene.