Bio-based EVA compositions and articles and methods thereof

Patent metadata

Field	Value
Publication number	US-11267959-B2
Application number	US-201916385767-A
Country	US
Kind code	B2
Filing date	Apr 16, 2019
Priority date	Apr 16, 2018
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

A copolymer may include ethylene and vinyl acetate, in which the ethylene is at least partially obtained from a renewable source of carbon. Embodiments may also be directed to curable polymer compositions, expandable polymer compositions, articles, cured articles, and expanded articles formed from or including such copolymers of ethylene and vinyl acetate, in which the ethylene is at least partially obtained from a renewable source of carbon. A process for producing an ethylene vinyl acetate copolymer may include polymerizing ethylene at least partially obtained from a renewable source of carbon with vinyl acetate to produce the ethylene vinyl actate copolymer.

First claim

What is claimed:

1. A copolymer of ethylene and vinyl acetate, in which the ethylene is at least partially obtained from a renewable source of carbon, wherein the copolymer exhibits a Shore A hardness as determined by ASTM D2240 in the range of 60 to 100 Shore A, wherein the copolymer exhibits a biobased carbon content as determined by ASTM D6866-18 Method B of at least 5%, and wherein the copolymer produces a reduced concentration of carbon dioxide having a fossil origin compared to a copolymer exhibiting a biobased carbon content of 0%.

2. The copolymer of claim 1 , wherein the vinyl acetate is at least partially obtained from a renewable source of carbon.

3. The copolymer of claim 1 , wherein the vinyl acetate is present in the copolymer in an amount ranging from 5 to 95 wt %.

4. The copolymer of claim 1 , wherein the ethylene is present in the copolymer in an amount ranging from 5 to 95 wt %.

5. The copolymer of claim 1 , wherein the copolymer exhibits a Shore A hardness as determined by ASTM D2240 in the range of 60 to 80 Shore A.

6. The copolymer of claim 1 , wherein the copolymer exhibits a Mooney viscosity ML (1+4) at 100° C. as determined by ASTM D 1646 in the range of 15 to 50 MU.

7. The copolymer of claim 1 , wherein the copolymer further comprises at least one additional comonomer.

8. The copolymer of claim 1 , wherein the copolymer exhibits a biobased carbon content as determined by ASTM D6866-18 Method B of at least 10%.

9. An article prepared from the copolymer of claim 1 .

10. A curable polymer composition comprising the copolymer of claim 1 and at least a peroxide agent.

11. A cured non-expanded article prepared from the curable polymer composition of claim 10 .

12. The cured non-expanded article of claim 11 , wherein the cured article exhibits a density as determined by ASTM D-792 within the range of 0.7 to 1.2 g/cm 3 .

13. The cured non-expanded article of claim 11 , wherein the cured article exhibits a Shore A hardness as determined by ASTM D2240 in the range of 40 to 90 Shore A.

14. The cured non-expanded article of claim 11 , wherein the cured article exhibits an abrasion resistance as determined by ISO 4649:2017 measured with a load of 10N within the range 20 mm 3 to 200 mm 3 .

15. The cured non-expanded article of claim 11 , wherein the cured article exhibits a biobased carbon content as determined by ASTM D6866-18 Method B of at least 5%.

16. An expandable polymer composition comprising the copolymer of claim 1 and at least a blowing agent and a peroxide agent.

17. An expanded article prepared from the expandable polymer composition of claim 16 .

18. The expanded article of claim 17 , wherein the expanded article exhibits a density as determined by ASTM D-792 within the range of 0.05 to 0.7 g/cm 3 .

19. The expanded article of claim 17 , wherein the expanded article exhibits an Asker C hardness as determined by ABNT NBR 14455:2015 in the range of 20 to 95 Asker C.

20. The expanded article of claim 17 , wherein the expanded article exhibits a permanent compression set as determined by ASTM D395:2016 Method B in the range of 20% to 95%.

21. The expanded article of claim 17 , wherein the expanded article exhibits a rebound as determined by ABNT NBR 8619:2015 within the range of 20% to 80%.

22. The expanded article of claim 17 , wherein the expanded article exhibits an abrasion resistance as determined by ISO 4649 measured with a load of 5 N within the range 40 mm3 to 400 mm3.

23. The expanded article of claim 17 , wherein the expanded article exhibits a shrinkage as determined at 70° C.*1h according to the PFI method between 0.1 and 7%.

24. The expanded article of claim 17 , wherein the expanded article exhibits a biobased carbon content as determined by ASTM D6866-18 Method B of at least 5%.

25. The article of claim 9 , wherein the article is selected from a group consisting of shoe soles, midsoles, outsoles, unisoles, insoles, monobloc sandals, flip flops, full EVA footwear, sportive articles, seals, hoses, gaskets, foams, foam mattresses and automotive parts.

26. A process for forming an ethylene vinyl acetate copolymer, comprising:
polymerizing ethylene at least partially obtained from a renewable source of carbon with vinyl acetate to produce the ethylene vinyl acetate co-polymer, the copolymer exhibits a Shore A hardness as determined by ASTM D2240 in the range of 60 to 100 Shore A, wherein the copolymer exhibits a biobased carbon content as determined by ASTM D6866-18 Method B of at least 5%, and wherein the copolymer produces a reduced concentration of carbon dioxide having a fossil origin compared to a copolymer exhibiting a biobased carbon content of 0%.

27. The process of claim 26 , wherein the ethylene vinyl acetate copolymer exhibits a biobased carbon content as determined by ASTM D6866-18 Method B of at least 10%.

28. The process of claim 26 , wherein the vinyl acetate is at least partially obtained from a renewable source of carbon.

29. The process of claim 26 , further comprising:
fermenting a renewable source of carbon to produce ethanol; and
dehydrating the ethanol to produce the ethylene.

30. The process of claim 29 , wherein the fermenting produces the ethanol and byproducts comprising higher alcohol, and the dehydration produces the ethylene and higher alkene impurities, wherein the process further comprises: purifying ethylene and the higher alkene impurities order to obtain the ethylene.

31. The process of claim 29 , wherein the fermenting produces the ethanol and byproducts comprising higher alcohols, wherein the process further comprises: purifying the ethanol and byproducts in order to obtain the ethanol.

32. The process of claim 29 , wherein the renewable source of carbon are plant materials selected from the group consisting of sugar cane and sugar beet, maple, date palm, sugar palm, sorghum, American agave, corn, wheat, barley, sorghum, rice, potato, cassava, sweet potato, algae, fruit, materials comprising cellulose, wine, materials comprising hemicelluloses, materials comprising lignin, wood, straw, sugarcane bagasse, sugarcane leaves, corn stover, wood residues, paper, and combinations thereof.

33. The process of claim 29 , wherein the ethylene vinyl acetate copolymer exhibits a biobased carbon content as determined by ASTM D6866-18 Method B of at least 5%.

34. The process of claim 26 , wherein the process further comprises: curing the ethylene vinyl acetate copolymer in the presence of a peroxide agent.

35. The process of claim 26 , wherein the process further comprises: expanding and curing the ethylene vinyl acetate copolymer in the presence of at least a blowing agent and a peroxide agent.

36. The process of claim 34 , wherein the curing of the ethylene vinyl acetate copolymer occurs in a full or partial presence of oxygen.

Assignees

• Braskem Sa

Inventors

• Delevati Giancarlos
• Soto Oviedo Mauro Alfredo
• Munhoz Anderle Fernanda
• Renck Omar Wandir
• Esteves Viveiro José Augusto

Classifications

• C08F210/02

  Ethene · CPC title

• C08L23/0853 Primary

  Ethylene vinyl acetate copolymers · CPC title

• C08J2323/08

  Copolymers of ethene (C08J2323/16 takes precedence) · CPC title

• C08J9/104

  Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof · CPC title

• C08J2203/02

  CO2-releasing, e.g. NaHCO3 and citric acid · CPC title