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CN-122029233-A - Thermoplastic polymer composition with enhanced sag resistance

CN122029233ACN 122029233 ACN122029233 ACN 122029233ACN-122029233-A

Abstract

The present disclosure relates generally to a thermoplastic polymer composition. The thermoplastic polymer composition may be particularly suitable for blow molding applications. The thermoplastic polymer composition may comprise a first polyamide, a second polyamide, and a third polyamide.

Inventors

  • Shailesh Latilar Duo Xi

Assignees

  • 塞拉尼斯聚合物控股有限公司

Dates

Publication Date
20260512
Application Date
20241011
Priority Date
20231013

Claims (20)

  1. 1. A thermoplastic polymer composition comprising: a first polyamide comprising a first aliphatic homo-polyamide; a second polyamide comprising a semiaromatic copolyamide; a third polyamide comprising a second aliphatic homo-polyamide, wherein the first aliphatic homo-polyamide and the second aliphatic homo-polyamide are present in the thermoplastic polymer composition in a weight ratio of about 5:4 or more, and An impact modifier present in the thermoplastic polymer composition in an amount greater than about 5 wt%.
  2. 2. The thermoplastic polymer composition of claim 1, wherein the first aliphatic homo-polyamide comprises repeat units derived from a lactam having 6 to 20 carbon atoms.
  3. 3. The thermoplastic polymer composition of claim 1, wherein the second aliphatic homo-polyamide comprises repeat units derived from an aliphatic dicarboxylic acid having 6 to 20 carbon atoms and an aliphatic diamine having 4 to 20 carbon atoms.
  4. 4. The thermoplastic polymer composition of claim 1, wherein the semi-aromatic copolyamide comprises repeat units derived from an aromatic dicarboxylic acid having 8 to 20 carbon atoms and an aliphatic diamine having 4 to 20 carbon atoms.
  5. 5. The thermoplastic polymer composition of claim 4, wherein the semi-aromatic copolyamide further comprises repeat units derived from an aliphatic dicarboxylic acid having 6 to 20 carbon atoms and an aliphatic diamine having 4 to 20 carbon atoms.
  6. 6. The thermoplastic polymer composition of claim 1, wherein the semi-aromatic copolyamide comprises a first repeat unit present in an amount from about 50 mole percent to about 90 mole percent of the semi-aromatic copolyamide and a second repeat unit present in an amount from about 10 mole percent to about 50 mole percent.
  7. 7. The thermoplastic polymer composition of claim 6, wherein the first repeat unit is an aliphatic repeat unit and the second repeat unit is an aromatic repeat unit.
  8. 8. The thermoplastic polymer composition of claim 1, wherein the semi-aromatic copolyamide comprises a first repeat unit present in an amount from about 60 mole percent to about 80 mole percent and a second repeat unit present in an amount from about 20 mole percent to about 40 mole percent of the semi-aromatic copolyamide.
  9. 9. The thermoplastic polymer composition of claim 8, wherein the first repeat unit is an aliphatic repeat unit and the second repeat unit is an aromatic repeat unit.
  10. 10. The thermoplastic polymer composition of claim 1, wherein the first aliphatic homo-polyamide and the second aliphatic homo-polyamide are present in the thermoplastic polymer composition in a weight ratio of about 3:2 or greater.
  11. 11. The thermoplastic polymer composition of claim 1, wherein the impact modifier is functionalized.
  12. 12. The thermoplastic polymer composition of claim 1, wherein the impact modifier comprises anhydride groups.
  13. 13. The thermoplastic polymer composition of claim 1, wherein the first aliphatic homo-polyamide is present in the thermoplastic polymer composition in an amount from about 20 wt to about 70 wt%.
  14. 14. The thermoplastic polymer composition of claim 1, wherein the second aliphatic homo-polyamide is present in the thermoplastic polymer composition in an amount from about 2 wt to about 20 wt%.
  15. 15. The thermoplastic polymer composition of claim 1, wherein the semi-aromatic copolyamide is present in the thermoplastic polymer composition in an amount from about 2wt to about 30 wt%.
  16. 16. The thermoplastic polymer composition of claim 1, wherein the impact modifier is present in the thermoplastic polymer composition in an amount of less than about 50 wt%.
  17. 17. The thermoplastic polymer composition of claim 1, wherein the semi-aromatic copolyamide and the second aliphatic homopolyamide comprise repeat units derived from the same diacid and the same diamine.
  18. 18. The thermoplastic polymer composition of claim 1, wherein the semi-aromatic copolyamide comprises aliphatic repeat units, wherein the second aliphatic homo-polyamide comprises aliphatic repeat units, wherein the aliphatic repeat units of the semi-aromatic copolyamide and the aliphatic repeat units of the second aliphatic homo-polyamide are derived from the same diacid and the same diamine.
  19. 19. The thermoplastic polymer composition of claim 1, wherein the first aliphatic homo-polyamide is PA 6, wherein the semiaromatic copolyamide is PA 610/6T, and wherein the second aliphatic homo-polyamide is PA 610.
  20. 20. The thermoplastic polymer composition of claim 19, wherein the first aliphatic homo-polyamide is present in the thermoplastic polymer composition in an amount from about 30 wt% to about 60 wt%, wherein the semi-aromatic co-polyamide is present in the thermoplastic polymer composition in an amount from about 5wt% to about 25% wt%, the semi-aromatic co-polyamide comprising aliphatic repeating units present in an amount from about 60 to about 90 mole percent of the semi-aromatic co-polyamide and aromatic repeating units present in an amount from about 10 to about 40 mole percent, wherein the second aliphatic homo-polyamide is present in the thermoplastic polymer composition in an amount from about 5wt% to about 15 wt%, and wherein the impact modifier is present in the thermoplastic polymer composition in an amount from about 15 to about 15% wt to about 40 wt%.

Description

Thermoplastic polymer composition with enhanced sag resistance RELATED APPLICATIONS The present application is based on and claims priority from U.S. provisional patent application Ser. No. 63/590,010 filed on 13, 10, 2023, which is incorporated herein by reference in its entirety. Background In recent years, enterprise sustainable development initiatives and national environmental protection initiatives have become increasingly prominent and influential. For example, electric vehicles are becoming increasingly prominent as consumers and various industries attempt to reduce carbon emissions. Notably, a fuel cell vehicle (which is a type of electric vehicle) includes a fuel cell that generates electricity by reacting hydrogen with oxygen. Generally, a tank containing hydrogen is used to store hydrogen in a fuel cell vehicle. An important consideration in manufacturing a tank suitable for containing hydrogen is the gas permeability of the tank. Indeed, the small molecular size of hydrogen makes it particularly difficult for hydrogen to remain in a container (e.g., a tank). Thus, hydrogen tanks typically include a polymer liner that serves to prevent or reduce permeation of hydrogen outside the tank. In addition, hydrogen internal combustion engines may use polymeric liners in one or more of their components. In general, polymeric liners used in gas tanks may be formed by injection molding, extrusion molding, or blow molding. Both injection molding and extrusion molding processes may require the polymer liner to be manufactured in two or more parts, which are typically welded together in a second step. Notably, the blow molding process is capable of forming a complete polymeric liner as a single unitary piece, and thus may not use a subsequent welding step. Thus, blow molding may be a generally preferred method for large-sized liners. Notably, blow molding is a demanding process that preferably uses a polymeric material that has good melt sag resistance and melt solidification characteristics suitable for forming a reliable pinch weld during the molding cycle. Furthermore, conventional polymeric liners formed by blow molding may have limited sag resistance, may have a sharp freezing point, and may have limited cold impact resistance or toughness. Thus, there is a need for a thermoplastic polymer composition that is suitable as a polymer liner for tanks, particularly hydrogen tanks used in fuel cell vehicles. Disclosure of Invention In general, the present disclosure relates to a thermoplastic polymer composition. The thermoplastic polymer composition may be particularly suitable for blow molding applications. In one aspect, the thermoplastic polymer composition may comprise a first polyamide comprising a first aliphatic homo-polyamide, a second polyamide comprising a semiaromatic copolyamide, a third polyamide comprising a second aliphatic homo-polyamide, wherein the first aliphatic homo-polyamide and the second aliphatic homo-polyamide may be present in the thermoplastic polymer composition in a weight ratio of about 5:4 or greater, and an impact modifier present in the thermoplastic polymer composition in an amount of greater than about 5 wt%. In one aspect, the first aliphatic homo-polyamide may comprise repeat units derived from a lactam having 6 to 20 carbon atoms. In one aspect, the second aliphatic homo-polyamide may comprise repeat units derived from an aliphatic dicarboxylic acid having 6 to 20 carbon atoms and an aliphatic diamine having 4 to 20 carbon atoms. In one aspect, the semiaromatic copolyamide may comprise repeat units derived from an aromatic dicarboxylic acid having 8 to 20 carbon atoms and an aliphatic diamine having 4 to 20 carbon atoms. The semiaromatic copolyamide may further comprise repeat units derived from an aliphatic dicarboxylic acid having 6 to 20 carbon atoms and an aliphatic diamine having 4 to 20 carbon atoms. Notably, the semi-aromatic copolyamide may comprise first repeat units present in an amount from about 50 mole percent to about 90 mole percent of the semi-aromatic copolyamide and second repeat units present in an amount from about 10 mole percent to about 50 mole percent. In one aspect, the first repeat unit may be an aliphatic repeat unit and the second repeat unit may be an aromatic repeat unit. In one aspect, the semi-aromatic copolyamide may comprise first repeat units present in an amount from about 60 mole percent to about 80 mole percent and second repeat units present in an amount from about 20 mole percent to about 40 mole percent of the semi-aromatic copolyamide. In one aspect, the first repeat unit may be an aliphatic repeat unit and the second repeat unit may be an aromatic repeat unit. In one aspect, the aliphatic repeat units of the semiaromatic copolyamide are substantially identical to the repeat units of one of the aliphatic homopolyamides. In general, the first aliphatic homo-polyamide and the second aliphatic homo-polyamide may be present in the th