this high concentration any suitable white pigment may be incorporated in the polyolefin layer such as for example titanium dioxide zinc oxide zinc sulfide zirconium dioxide white lead lead sulfate lead chloride lead aluminate lead phthalate antimony trioxide white bismuth tin oxide white manganese white tungsten and combinations thereof the pigment is used in any form that is conveniently dispersed within the polyolefin the preferred pigment is titanium dioxide and the preferred titanium dioxide is the anatase crystalline form preferably the white pigment should be employed in the range of from about 3 to about 35 percent by weight preferably from about 5 to about 25 percent by weight based on the total weight of the polyolefin coating anatase titanium dioxide at from about 5 to about 20 percent is most preferred in addition to the brightener mixture and the white pigment the polyolefin coating can contain if desired a variety of additives including antioxidants such as 4 4 39 butylidene bis 6 tert butyl meta cresol di lauryl 3 3 39 thiodipropionate n butylated p aminophenol 2 6 di tert butyl p cresol 2 2 di tert butyl 4 methyl phenol n n disalicylidene 1 2 diaminopropane tetra 2 4 tert butylphenyl 4 4 39 diphenyl diphosphonite octadecyl 3 3 39 5 39 di tert butyl 4 39 hydroxyphenyl propionate combinations of the above and the like heat stabilizers such as higher aliphatic acid metal salts such as magnesium stearate calcium stearate zinc stearate aluminum stearate calcium palmitate sodium palmitate zirconium octylate sodium laurate and salts of benzoic acid such as sodium benzoate calcium benzoate magnesium benzoate and zinc benzoate additional optical brightener antistatic agents dispersing agents coating aids slip agents lubricants dyes and the like as is well known to those skilled in.