Patent US10774213

Polymer composition for the manufacture of thermoformed articles
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US10774213

1. A polymer composition for the production of thermoformed articles comprising, with respect to the sum of components i.-iv.: (7) (4)

i) 20-60% by weight of at least one polyester i. comprising: a) a dicarboxylic component comprising with respect to the total dicarboxylic component: a2) 95-100% in moles of units deriving from succinic acid,

a3) 0-5% in moles of units deriving from at least one unsaturated aliphatic dicarboxylic acid;

b) a diol component comprising, with respect to the total diol component: b1) 95-100% in moles of units deriving from at least one saturated aliphatic diol;

b2) 0-5% in moles of units deriving from at least one unsaturated aliphatic diol;

ii) 5-35% by weight of at least one polyhydroxyalkanoate ii.;

iii) 0.01-5% by weight of at least one cross-linking agent and/or a chain extender iii. comprising at least one compound having di- and/or multiple functional groups comprising isocyanate, peroxide, carbodiimide, isocyanurate, oxazoline, epoxy, anhydride, divinyl ether groups and mixtures thereof;

iv) 5-50% by weight of at least one mineral filler agent present in the form of particles having a median diameter of less than 1.5 microns.

2. The polymer composition according to claim 1, in which the said aliphatic polyester (AP) is poly(1,4-butylene succinate). (3) (0)

3. The polymer composition according to claim 1, in which the said at least one polyhydroxyalkanoate ii. is selected from the group consisting of polyesters of lactic acid, poly-ε-caprolactone, polyhydroxybutyrate, polyhydroxybutyrate-valerate, polyhydroxybutyrate propanoate, polyhydroxybutyrate-hexanoate, polyhydroxybutyrate-decanoate, polyhydroxybutyrate-dodecanoate, polyhydroxybutyrate-esadecanoate, polyhydroxybutyrate-ottadecanoate, and poly-3-hydroxybutyrate 4-hydroxybutyrate. (3) (0)

4. The polymer composition according to claim 1, wherein the said at least one mineral filler agent iv. is talc. (3) (0)

5. The polymer composition according to claim 1, wherein the said mineral filler agent is present in the form of particles having a median diameter of less than 1.2 microns. (1) (0)

6. A thermoformed article comprising the polymer composition according to claim 1. (1) (0)

17. The polymer composition according to claim 1, wherein the aliphatic polyester (AP) is poly(1,4-butylene succinate), the at least one polyhydroxyalkanoate ii. is a polyester of lactic acid containing at least 95% by weight of repetitive units deriving from L-lactic or D-lactic acid or their combinations, with a molecular weight Mw of more than 50,000 and with a shear viscosity of between 50 and 500 Pa·s; and the at least one filler agent iv. is talc in the form of particles having a median diameter of less than 1.2 microns. (1) (0)

19. The polymer composition according to claim 1, wherein the at least one cross-linking agent and/or a chain extender iii. is a mixture of compounds comprising at least 75% by weight of a compound having di- and/or multiple functional groups incorporating isocyanate groups with a compound having di- and/or multiple functional groups incorporating epoxy groups. (0)

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Patent US10774213

Polymer composition for the manufacture of thermoformed articles

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