| abstract |
The invention relates to a polymer-based composition, which is intended to be used especially as an extrudable or coextrudable film or film coating for a substrate in web form, such as packaging cardboard. According to the invention, the composition contains polymer, the melt viscosity (MRF2) of which is 0.5-20 g/10 min., and black and white pigment blended with the polymer, with which the composition is tinted grey and made to absorb visible light and UV radiation. Polyolefins, especially low-density polyethylene, are suitable as polymer, black pigment may be carbon black, and white pigment can be titanium dioxide. The greyness caused by the joint effect of the black and white pigment imitates the appearance of aluminium foil, traditionally used in packaging cardboard. With the light and UV protection achieved with the composition, it is possible to improve the durability of packed light-sensitive foods, such as juices. |