PROCESS FOR PLASMA COATING A POLYPROPYLENE OBJECT

A process for preparing an adherent coating on an object (as well as the coated object) by first plasma polymerizing a first organosilicon compound under conditions to deposit a polyorganosiloxane layer onto the object; and/or then plasma polymerizing a second organosilicon compound under conditions to deposit a silicon oxide layer on the polyorganosiloxane layer or directly on the object, the object comprising a polymer composition comprising (i) from 99 to 50 weight percent of a polymer having more than 90 weight percent monomer units containing three carbons and optionally monomer units selected from the group consisting of alpha olefins containing two carbons and/or from four to twelve carbons, and (ii) from 1 to 50 weight percent of a second copolymer comprising monomer units selected from the group consisting of alpha olefins containing two carbons and alpha olefins containing from four to twelve carbons and optionally up to 10 weight percent of a diene monomer containing less than thirteen carbons; or the object comprises an alternative polymer composition comprising (iii) from 1 to 50 weight percent of a copolymer of propylene and up to 10 weight percent of a comonomer selected from the group consisting of alpha olefins containing two carbons and/or from four to twelve carbons, and (iv) from 99 to 50 weight percent of an impact copolymer consisting of a blend of homopolymer polypropylene with up to 50 weight percent of a random copolymer of propylene and an alpha olefin containing two carbons and/or from four to twelve carbons.