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EP-4077540-B1 - POLYESTER COMPOSITION

EP4077540B1EP 4077540 B1EP4077540 B1EP 4077540B1EP-4077540-B1

Inventors

  • VENDERBOSCH, ROBERT WALTER
  • BOONMAN, Rob
  • MARTENS, JOHANNES PETER ANTONIUS
  • WETERING, VAN DE, Karin Irene

Dates

Publication Date
20260513
Application Date
20201217

Claims (15)

  1. A composition comprising A) a polyester , wherein the polyester is derived from an aliphatic diol and an aromatic dicarboxylic acid and has repeating units according to structural formula (VIII) wherein, R' is an alkyl radical comprising a dehydroxylated residue derived from an aliphatic or cycloaliphatic diol, or mixtures thereof, containing from 2 to about 20 carbon atoms and wherein R is an aryl radical comprising a decarboxylated residue derived from an aromatic dicarboxylic acid, B) a polyolefin and C) a compatibilizer, wherein C) is a functionalized polyolefin containing hydroxyl functional groups or a reaction product of the functionalized polyolefin and a polyester, wherein the total amount of A) and B) with respect to the total composition is at least 77 wt% and the amount of C) with respect to the total composition is 0.1 to 23 wt%.
  2. The composition according to claim 1, wherein the functionalized polyolefin is prepared by reacting an alkanolamine with a grafted polyolefin formed by grafting a compound comprising an amine-reactive group onto the backbone of a polyolefin.
  3. The composition according to any one of the preceding claims, wherein the compound comprising the amine-reactive group is selected from the group consisting of ethylenically unsaturated carboxylic acids such as maleic acid, fumaric acid, itaconic acid, acrylic acid, methacrylic acid, and crotonic acid; acid anhydrides such as maleic anhydride and itaconic anhydride; vinyl benzyl halides such as vinyl benzyl chloride and vinyl benzyl bromide; alkyl acrylates and methacrylates such as methyl acrylate, ethyl acrylate, butyl acrylate, lauryl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, and lauryl methacrylate; and ethylenically unsaturated oxiranes, such as glycidyl acrylate, glycidyl methacrylate, and glycidyl ethacrylate, preferably wherein said compound is maleic anhydride.
  4. The composition according to any one of the preceding claims, wherein the alkanolamine is selected from the group consisting of ethanolamine, 2-amino-1-propanol, 3-amino-1-propanol, 2-amino-1-butanol and 2-aminobenzyl alcohol, preferably ethanolamine.
  5. The composition according to any one of the preceding claims, wherein the polyolefin of the grafted polyolefin is a linear low density polyethylene (LLDPE), for example made from ethylene and a comonomer which is 1-octene.
  6. The composition according to any one of claims 1-5, wherein C) is the functionalized polyolefin containing hydroxyl functional groups.
  7. The composition according to any one of claims 1-5, wherein C) is the reaction product of the functionalized polyolefin and the polyester, preferably wherein said polyester is of the same type as B).
  8. The composition according to any one of the preceding claims, wherein the amount of A) with respect to the total composition is at least 50 wt%, more preferably at least 75 wt%, for example is 75 to 94 wt%, 80 to 94 wt% or 85 to 92 wt%.
  9. The composition according to any one of the preceding claims, wherein A) is selected from the group consisting of polyethylene terephthalate (PET) and polybutylene terephthalate (PBT) and a combination thereof.
  10. The composition according to any one of the preceding claims, wherein A) is a recycled PET.
  11. The composition according to any one of the preceding claims, wherein the amount of B) with respect to the total composition is at most 40 wt%, more preferably at most 35 wt%, for example 5 to 22.5 wt%, 5 to 20 wt%, preferably 6 to 18 wt% or 8 to 15 wt%, with respect to the total composition.
  12. The composition according to any one of the preceding claims, wherein B) is selected from the group consisting of a low density polyethylene (LDPE), a linear low density polyethylene (LLDPE), a high density polyethylene (HDPE), polypropylene (PP) and an elastomeric copolymer of ethylene and an α-olefin having 4 to 10 carbon atoms, and combinations thereof.
  13. The composition according to claim 12, wherein B) is selected from the group consisting of an LDPE having a density of 0.916 to 0.940 g/cm 3 according to ISO1183, an LLDPE having a density of 0.915 to 0.940 g/cm 3 according to ISO 1183 and an HDPE having a density of 0.940 to 0.970 g/cm 3 according to ISO1183.
  14. The composition according to claim 12, wherein B) is an elastomeric copolymer of ethylene and an an α-olefin having 4 to 10 carbon atoms having a density of 0.850 to 0.910 g/cm 3 according to ASTM D792.
  15. The composition according to any one of the preceding claims, wherein the composition has at least one, preferably two, most preferably all, of a shrinkage of at most 2% as determined by ISO 294-4, a notched impact strength of at least 5 kJ/m 2 as determined by ISO180 (23 ºC) and a tensile modulus of at least 1800 MPa.

Description

The present invention relates to a composition comprising a polyester and a polyolefin. The invention further relates to a process for making such composition, an article comprising such composition and use of such composition for making an article. Improving mechanical properties of a polyester composition by adding a polyolefin is known, e.g. from US2006287441, which discloses a method for manufacturing a resin composition from a raw material composition containing a polyester resin, a polyolefin resin and a compatibilizer. The process comprises a kneading step for kneading the raw material composition in the presence of moisture. As the compatibilizer, an ethylene-glycidylmethacrylate (GMA) copolymer and an ethylene-methacrylic acid copolymer ionomer are used in the examples. These GMA functionalized polymers are currently under debate as they are associated with health risks. There is therefore a need for a compatibilizer free of GMA for use in blends of a polyester and a polyolefin. Accordingly, it is an object of the invention to provide a polyester composition comprising a polyester, a polyolefin and a compatibilizer free of GMA. It is another object of the invention to provide a polyester composition that is suitable for replacing currently used materials in articles that - when combined - interlock. Accordingly, the invention provides a composition comprising A) a polyester, B) a polyolefin and C) a compatibilizer, wherein C) is a functionalized polyolefin containing hydroxyl functional groups or a reaction product of the functionalized polyolefin and a polyester, wherein the total amount of A) and B) with respect to the total composition is at least 77 wt%, for example at least 79wt%, for example at least 80wt% andthe amount of C) with respect to the total composition is 0.1 to 23 wt%. It was found according to the invention that many materials used as a compatibilizer for polymer combinations other than polyester and polyolefin cannot be used as a compatibilizer for polyester and polyolefin as they cause surface defects. The inventors have surprising found that the hydroxyl functionalized polyolefin as used in the composition of the invention results in a composition which does not have surface defects while having properties comparable to those of compositions made using GMA-containing compatibilizers. It is noted that US20100143651 discloses a functionalized polyolefin containing hydroxyl functional groups and a composition comprising a polyolefin, a thermoplastic polyurethane and the functionalized polyolefin. US20100143651 does not disclose a composition comprising a polyester, a polyolefin and a functionalized polyolefin. US20100143651 does not disclose a composition comprising a polyester in a major amount. A) polyester The amount of A) with respect to the total composition is typically 5 to 95 wt%. Preferably, however, polyester is the main polymer in the composition. Accordingly, preferably, the amount of A) with respect to the total composition is greater than the amount of B) with respect to the total composition. Preferably, the amount of A) with respect to the total composition is at least 50 wt%, more preferably at least 75 wt%. For example, the amount of A) with respect to the total composition is 75 to 94 wt%, 80 to 94 wt% or 85 to 92 wt%. The properties of the composition of these embodiments having a major amount of polyester allow it to be used in applications where polyester has been used. Typically polyester resins include crystalline polyester resins such as polyester resins derived from an aliphatic or cycloaliphatic diol, or mixtures thereof, containing from 2 to about 10 carbon atoms and at least one aromatic dicarboxylic acid. Preferred polyesters are derived from an aliphatic diol and an aromatic dicarboxylic acid and have repeating units according to structural formula (VIII) wherein, R' is an alkyl radical compromising a dehydroxylated residue derived from an aliphatic or cycloaliphatic diol, or mixtures thereof, containing from 2 to about 20 carbon atoms. R is an aryl radical comprising a decarboxylated residue derived from an aromatic dicarboxylic acid. In one embodiment of the present invention the polyester could be an aliphatic polyester where at least one of R' or R is a cycloalkyl containing radical. The polyester is a condensation product where R' is the residue of an aryl, alkane or cycloalkane containing diol having 6 to 20 carbon atoms or chemical equivalent thereof, and R is the decarboxylated residue derived from an aryl, aliphatic or cycloalkane containing diacid of 6 to 20 carbon atoms or chemical equivalent thereof. The polyester resins are typically obtained through the condensation or ester interchange polymerization of the diol or diol equivalent component with the diacid or diacid chemical equivalent component. R' and R are preferably cycloalkyl radicals independently selected from the following structure IX: The diacids meant to include carboxylic