Polymers having decreased surface energy

A method for forming injection molded or blow molded polymeric articles with a non-fugitive release agent, said method comprising:

• mixing from about 99.5% to about 95.0% of a polyolefin with from about 0.5% to about 5.0% of a mold release agent having the structure R.sup.1 --A--Si(R.sup.2 R.sup.3)--O--[Si(R.sup.4 R.sup.5)--O].sub.n --Si(R.sup.6 R.sup.7)--A--R.sup.8 wherein R.sup.1 and R.sup.8 are selected from the group consisting of alkyl, aryl, and alkaryl derivatives of an aliphatic or aliphatic/aromatic alcohol or mono-acid with a molecular weight of between about 250 to about 600 daltons, A is selected from the group consisting of --O--, --NH--C(O)--NH--(CH.sub.2).sub.3 --, and C(O)--NH--(CH.sub.2).sub.3 --, R.sup.2, R.sup.3, R.sup.6 and R.sup.7 are selected from the group consisting of CH.sub.3, C.sub.2 H.sub.5, C.sub.3 H.sub.7, and CH.sub.4 H.sub.9, R.sup.4 and R.sup.5 are selected from the group consisting of CH.sub.3, C.sub.2 H.sub.5, C.sub.3 H.sub.7, and (CH.sub.2).sub.i --C.sub.j F.sub.2j+1, wherein i is from 0 to 3 and j is from 1 to 3, and n is from 7 to 70, wherein the mold release additive is substantially intimately mixed with the polymer;
• molding the mix of polymer and mold release additive by injection or blow molding in a mold form;
• and
• releasing the molded article from the mold form.