Polyolefin film compositions with permanent antifog properties
Polyolefin films having incorporated therein a compound of the formula CH 3 CH 2 (CH 2 CH 2 ) a CH 2 CH 2 (OCH 2 CH 2 ) b OH, where a is 9 to 25 and b is 1 to 10, exhibit superior long lasting fog resistance. The polyolefin films are useful as packaging film for moist products and as a greenhouse film for agricultural applications.
1. A fog-resistant polyolefin film composition comprising
(a) a polyolefin film; and
(b) at least one compound of the formula CH 3 CH 2 (CH 2 CH 2 ) a CH 2 CH 2 (OCH 2 CH 2 ) b OH where a is 10 to 25 and b is 1 to 10,
wherein component (b) is incorporated into the polyolefin film.
2. A composition according to claim 1 in which the polyolefin is polyethylene.
3. A composition according to claim 1 in which the polyolefin film is a greenhouse film.
4. A composition according to claim 1 in which the polyolefin film is a food packaging film.
5. A composition according to claim 1 where component (b) is present from about 0.1% to about 4%, based on the weight of the composition.
6. A composition according to claim 1 further comprising antifog additives selected from the group consisting of the alkoxylated ethers, sorbitan esters, polyoxyalkylene fatty acid esters, alkoxylated phenols, mixed mono-, di-, or triglycerides, fatty acid esters of polyhydroxy alcohols and other polyalkoxylated compounds.
7. A composition according to claim 1 further comprising one or more stabilizers selected from the group consisting of the antioxidants, sterically hindered amine light stabilizers, phosphites or phosphonites, hydroxylamines and hydroxyphenylbenzotriazole, hydroxybenzophenone or hydroxyphenyl-s-triazine UV absorbers.
8. A composition according to claim 1 where b is 1 to 6.