Application US20190160796

MULTILAYER BIODEGRADABLE FILM
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US20190160796

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: (7) (5)

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.

2. The multilayer film according to claim 1, in which the said aliphatic-aromatic polyester in layer A comprises: (3) (2)

c) a dicarboxylic component comprising with respect to the total dicarboxylic component: c1) 35-70% by moles of units deriving from at least one aromatic dicarboxylic acid,

c2) 65-30% by moles of units deriving from at least one saturated aliphatic dicarboxylic acid, and

c3) 0-5% by moles of units deriving from at least one unsaturated aliphatic dicarboxylic acid; and

d) a diol component comprising with respect to the total diol component: d1) 95-100% by moles of units deriving from at least one saturated aliphatic diol, and

d2) 0-5% by moles of units deriving from at least one unsaturated aliphatic diol.

3. The multilayer film according to claim 2, in which the saturated aliphatic dicarboxylic acids in component c2 comprise mixtures comprising at least 50% by moles of at least one acid selected from succinic acid, adipic acid, azelaic acid, sebacic acid, brassylic acid, their C₁-C₂₄, preferably C₁-C₄, esters and mixtures thereof. (3) (0)

4. The multilayer film according to claim 3, in which the saturated aliphatic dicarboxylic acids in component c2 are selected from adipic acid and azelaic acid or mixtures thereof. (2) (0)

15. The multilayer film according to claim 3, in which in addition to the said aliphatic and/or aliphatic-aromatic polyester in layer A the said layer A comprises 1-40% by weight with respect to the total for layer A of at least one polyhydroxy alkanoate. (0)

18. The multilayer film according to claim 3, in which the saturated aliphatic dicarboxylic acid of component a2 of the polyester in layer B comprise mixtures comprising at least 50% by moles of at least one acid selected from succinic acid, adipic acid, azelaic acid, sebacic acid, brassylic acid, their C₁-C₂₄, preferably C₁-C₄, esters and mixtures thereof. (0)

14. The multilayer film according to claim 2, in which in addition to the said aliphatic and/or aliphatic-aromatic polyester in layer A the said layer A comprises 1-40% by weight with respect to the total for layer A of at least one polyhydroxy alkanoate. (0)

17. The multilayer film according to claim 2, in which the saturated aliphatic dicarboxylic acid of component a2 of the polyester in layer B comprise mixtures comprising at least 50% by moles of at least one acid selected from succinic acid, adipic acid, azelaic acid, sebacic acid, brassylic acid, their C₁-C₂₄, preferably C₁-C₄, esters and mixtures thereof. (0)

5. The multilayer film according to claim 1, in which in addition to the said aliphatic and/or aliphatic-aromatic polyester in layer A the said layer A comprises 1-40% by weight with respect to the total for layer A of at least one polyhydroxy alkanoate. (1) (0)

6. The multilayer film according to claim 1, in which the saturated aliphatic dicarboxylic acid of component a2 of the polyester in layer B comprise mixtures comprising at least 50% by moles of at least one acid selected from succinic acid, adipic acid, azelaic acid, sebacic acid, brassylic acid, their C₁-C₂₄, preferably C₁-C₄, esters and mixtures thereof. (1) (0)

8. The multilayer film according to claim 1, wherein transmittance values of more than 90%, Haze values of less than 65%, and clarity over 20%, measured according to standard ASTM D1003. (0)

9. The multilayer film according to claim 1, said film being biodegradable under home composting conditions according to UNI 11355. (0)

10. A packaging comprising the multilayer film according to claim 1. (1) (0)

13. A mulch film comprising the multilayer film according to claim 1. (0)

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Application US20190160796

MULTILAYER BIODEGRADABLE FILM

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