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Application US20190160796
Published 2019-05-30
Multilayer Biodegradable Film
This invention relates to a multilayer biodegradable film which is particularly suitable for the manufacture of packaging and is also characterised by appreciable optical transparency properties in addition to high level mechanical properties.
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USPTO Full Text Publication >
- 1. A multilayer film comprising at least one first layer A and at least one second layer B, in which layers A and B have a mutual A/B/A arrangement, wherein the layer A and layer B are different from each other, in which layer A comprises an aliphatic and/or aliphatic-aromatic biodegradable polyester or a polyvinyl alcohol or copolymers thereof and in which layer B comprises:
i)30-95% by weight, with respect to the sum of components i-v, of at least one polyester comprising:
a) a dicarboxylic component containing with respect to the total dicarboxylic component:
a1) 35-70% by moles of units deriving from at least one aromatic dicarboxylic acid,
a2) 65-30% by moles of units deriving from at least one saturated aliphatic dicarboxylic acid, and
a3) 0-5% by moles of units deriving from at least one unsaturated aliphatic dicarboxylic acid; and
b) a diol component comprising with respect to the total diol component:
b1) 95-100% by moles of units deriving from at least one saturated aliphatic diol, and
2) 0-5% by moles of units deriving from at least one unsaturated aliphatic diol;
ii) 0.1-50% by weight, with respect to the sum of components i-v, of at least one polymer of natural origin; iii) 1-40% by weight, with respect to the sum of components i-v, of at least one polyhydroxy alkanoate; iv) 0-15% by weight, with respect to the sum of components i-v, of at least one inorganic filler; and v) 0-5% by weight, with respect to the sum of components i.-v., of at least one cross-linking agent and/or chain extender comprising at least one compound having two and/or multiple functional groups including isocyanate, peroxide, carbodiimide, isocyanurate, oxazoline, epoxide, anhydride divinylether groups and mixtures thereof.
