Application US20200199354

BIODEGRADABLE POLYESTER ARTICLE COMPRISING ENZYMES
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US20200199354

1.-17. (canceled) (0)

18. A process for preparing a plastic article comprising at least one polyester and at least one enzyme having a polyester-degrading activity homogeneously dispersed in the plastic article, said process comprising: (5) (3)

a step (a) of mixing between 0.01% and 10% by weight of the at least one enzyme having a polyester-degrading activity with a least said one polyester; and

a step (b) of shaping said mixture of step (a) in a plastic article,

wherein the at least one enzyme is mixed during step (a) under the form of a masterbatch comprising the at least one enzyme having a polyester-degrading activity, a carrier selected from polysaccharides, and a carrier polymer having a melting temperature below 140° C. and/or a glass transition temperature below 70° C.

19. The process according to claim 18, wherein the step (a) of mixing is performed at a temperature at which the polyester is in a partially or totally molten state and/or in an extruder. (0)

20. The process of claim 18, wherein the polyester has a melting temperature above 140° C. (0)

21. The process of claim 18, wherein the polyester is selected from copolymers of lactic acid and/or succinic acid and/or terephthalic acid. (0)

25. The process of claim 18, wherein the natural gum is arabic gum. (0)

27. The process of claim 18, wherein the carrier polymer having a melting temperature below 140° C. and/or a glass transition temperature below 70° C. is a polyester selected from polycaprolactone (PCL), poly butylene succinate adipate (PBSA), polybutylene adipate terephthalate (PBAT), polydioxanone (PDS), polyhdroxyalkanoate (PHA), polylactic acid (PLA) and mixtures thereof. (0)

22.-24. (canceled) (0)

26. (canceled) (0)

28.-30. (canceled) (0)

31. A masterbatch comprising at least one enzyme having a polyester-degrading activity, a carrier selected from polysaccharides and a carrier polymer having a melting temperature below 140° C. and/or a glass transition temperature below 70° C. (6) (0)

32. The masterbatch of claim 31, wherein the carrier polymer having a melting temperature below 140° C. and/or a glass transition temperature below 70° C. is a selected among a polyester, starch, EVA and mixtures thereof. (2) (0)

35. The masterbatch of claim 31, comprising from 50% to 95% by weight of carrier polymer having a melting temperature below 140° C. and/or a glass transition temperature below 70° C. based on the total weight of the masterbatch. (1) (0)

37. The masterbatch of claim 31, wherein the at least one enzyme comprises an enzyme having a polyester-degrading activity. (0)

38. The masterbatch of claim 31, comprising from 5% to 50% by weight of the at least one enzyme based on the total weight of the masterbatch. (1) (0)

40. The masterbatch of claim 31, wherein the polysaccharide carrier is selected from starch derivatives, natural gums, marine extracts, microbial and animal polysaccharides and mixtures thereof. (3) (0)

44. The masterbatch of claim 31, comprising from 1% to 30% of polysaccharide carrier. (1) (0)

46. A process for preparing a masterbatch comprising at least one enzyme having a polyester-degrading activity, a carrier selected among polysaccharides and a carrier polymer having a melting temperature below 140° C. and/or a glass transition temperature below 70° C., said process comprising mixing a liquid composition comprising the at least one enzyme and the carrier with the carrier polymer at a temperature at which the carrier polymer is in a partially or totally molten state. (5) (0)

47. The method of claim 46, wherein the liquid composition and the carrier polymer are mixed in an extruder. (0)

48. The method of claim 46, wherein the liquid composition comprises, based on the total weight of the composition: (0) (3)

49. The method of claim 46, wherein the polymer having a melting temperature below 140° C. and/or a glass transition temperature below 70° C. is a polyester selected from polycaprolactone (PCL), polybutylene succinate adipate (PBSA), polybutylene adipate terephthalate (PBAT), polydioxanone (PDS), polyhdroxyalkanoate (PHA), polylactic acid (PLA) and mixtures thereof. (0)

50. The method of claim 46, wherein the at least one enzyme is a protease. (0)

51. The method of claim 46, wherein the carrier is a natural gum is selected from arabic gum, guar gum, tragacanth gum, karaya gum and mixtures thereof. (0)

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Application US20200199354

BIODEGRADABLE POLYESTER ARTICLE COMPRISING ENZYMES

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