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EP-4735526-A1 - THERMOPLASTIC MOLDING COMPOSITIONS FOR EXTRUSION PROCESSES

EP4735526A1EP 4735526 A1EP4735526 A1EP 4735526A1EP-4735526-A1

Abstract

The invention relates to a thermoplastic molding composition (M) comprising: (A) 30 to 100 wt.-%, based on the total weight of the thermoplastic molding composition (M), of at least one thermoplastic polymer blend as component (A) comprising or consisting of: (A-1) 90.1 to 99.45 wt.-%, based on the total weight of the thermoplastic polymer blend (A), of at least one semi-aromatic polyester as component (A-1), (A-2) 0.5 to 4.9 wt.-%, based on the total weight of the thermoplastic polymer blend (A), of at least one unmodified polyolefin having a weight-average molecular weight (Mw) of from 85,000 to 900,000 g/mol as component (A-2); (A-3) 0.05 to 5 wt.-%, based on the total weight of the thermoplastic polymer blend (A), of at least one epoxy-containing vinylaromatic copolymer as component (A- 3); wherein the sum of the proportions of components (A-1), (A-2), and (A-3) add up to 100 wt.-%; and (B) 0 to 70 wt.-%, based on the total weight of the thermoplastic molding composition (M), of one or more further additives and processing aids as component (B); wherein the sum of the proportions of components (A) and (B) add up to 100 wt.-%. The invention further relates to a process for producing the thermoplastic molding composition (M), the use of the thermoplastic molding composition (M), molded articles (F) comprising the thermoplastic molding composition (M) and a process for producing the molded articles (F).

Inventors

  • RICHTER, FLORIAN
  • KUTSCHKER, Michaela
  • EHRET, Frank

Assignees

  • BASF SE

Dates

Publication Date
20260506
Application Date
20250818

Claims (15)

  1. 1. Thermoplastic molding composition (M) comprising: (A) 30 to 100 wt.-%, based on the total weight of the thermoplastic molding composition (M), of at least one thermoplastic polymer blend as component (A) comprising or consisting of: (A-1) 90.1 to 99.45 wt.-%, based on the total weight of the thermoplastic polymer blend (A), of at least one semi-aromatic polyester as component (A-1), (A-2) 0.5 to 4.9 wt.-%, based on the total weight of the thermoplastic polymer blend (A), of at least one unmodified polyolefin having a weight-average molecular weight (Mw) of from 85,000 to 900,000 g/mol as component (A- 2) selected from the group of: (A-2.1) polyethylene homopolymers as component (A-2.1); (A.2.2) polypropylene homopolymers as component (A-2.2); (A-2.3) polypropylene copolymers as component (A-2.3); and mixtures of components (A-2.1), (A-2.2) and/or (A-2.3); (A-3) 0.05 to 5 wt.-%, based on the total weight of the thermoplastic polymer blend (A), of at least one epoxy-containing vinylaromatic copolymer as component (A-3); wherein the sum of the proportions of components (A-1), (A-2), and (A-3) add up to 100 wt.-%; and (B) 0 to 70 wt.-%, based on the total weight of the thermoplastic molding composition (M), of one or more further additives and processing aids as component (B); wherein the sum of the proportions of components (A) and (B) add up to 100 wt.-%.
  2. 2. Thermoplastic molding composition (M) according to claim 1 , wherein the at least one semi-aromatic polyester component (A-1) is selected from polyethylene terephthalate (PET), polypropylene terephthalate (PTT), polybutylene terephthalate (PBT), and mixtures thereof.
  3. 3. Thermoplastic molding composition (M) according to claim 1 or 2, wherein the at least one unmodified polyolefin component (A-2) is selected from polypropylene homopolymers (A-2.2), polypropylene copolymers (A-2.3), and mixtures thereof.
  4. 4. Thermoplastic molding composition (M) according to any of claims 1 to 3, wherein the polypropylene copolymer (A-2.3) is selected from copolymers of propylene and ethylene.
  5. 5. Thermoplastic molding composition (M) according to any of claims 1 to 4, wherein the thermoplastic molding composition (M) further comprises at least one epoxidized oil or oil mixture as component (B). 240799W001 25
  6. 6. Thermoplastic molding composition (M) according to any of claims 1 to 5, wherein the at least one unmodified polyolefin as component (A-2) has a weight-average molecular weight (Mw) of from 95.000 to 750.000 g/mol.
  7. 7. Thermoplastic molding composition (M) according to any of claims 1 to 6, wherein the at least one unmodified polyolefin as component (A-2) has a density of from 0.850 g/cm 3 to 0.925 g/cm 3 .
  8. 8. Thermoplastic molding composition (M) according to any of claims 1 to 7, wherein the at least one epoxy-containing vinylaromatic copolymer (A-3) is selected from poly(styrene- glycidylether-methyl methacrylates).
  9. 9. Process for producing a thermoplastic molding composition (M) according to any of claims 1 to 8, wherein the process comprises at least the step of melt-mixing components (A-1), (A-2), (A-3), and optionally component(s) (B).
  10. 10. Use of a thermoplastic molding composition (M) according to any of claims 1 to 9 for injection molding applications and extrusion applications.
  11. 11. Use according to claim 10, wherein the molding composition (M) is used for the preparation of polymer fibers or polymer filaments
  12. 12. Molded article (F) comprising or consisting of the thermoplastic molding composition (M) according to any of claims 1 to 9.
  13. 13. Molded article (F) according to claim 12, wherein the molded article is a polymer fiber or polymer filament comprising or consisting of the thermoplastic molding composition (M) according to any of claims 1 to 9.
  14. 14. Process for producing a molded article (F) according to claim 12 or 13, wherein the process comprises at least the following process steps: (i) providing of the thermoplastic molding composition (M) according to the invention; and (ii) melt-extrusion of the thermoplastic molding composition (M).
  15. 15. Process according to claim 14, wherein the melt-extrusion step (ii) comprises a filament extrusion step or a fiber extrusion step.

Description

240799W001 Thermoplastic molding compositions for extrusion processes Description The present invention relates to a thermoplastic molding composition comprising at least one semi-aromatic polyester, at least one unmodified polyolefin, at least one epoxy-containing vinylaromatic copolymer, and optionally one or more further additives and processing aids. The molding composition according to the invention can advantageously be used in injection molding processes or extrusion molding processes, in particular for the production of polymer fibers and polymer filaments. The invention further relates to a process for producing the thermoplastic molding composition, the use of the thermoplastic molding composition, molded articles comprising the thermoplastic molding composition and a process for producing the molded articles. Polyester-based materials are known for their outstanding chemical resistance, allowing them to withstand a wide range of aggressive chemicals and solvents without degradation or damage. Polyesters are typically resistant to acids, alkalis, oils, fats, and many other chemical substances, making it suitable for various industrial applications such as chemical storage, container construction and filtration applications. The chemical resistance of polyesters contributes to the durability and reliability of products used in environments with aggressive chemical conditions. Thermoplastic polyester-based compositions are commonly processed through injection molding or extrusion processes. The resulting articles are often used in applications that require good mechanical properties and excellent chemical resistance. In order to obtain good results in injection molding or extrusion processes, a combination of good fracture elongation, high impact strength, and superior heat deflection temperature/heat resistance is of particular importance. For extrusion processes, thermoplastic polymers are therefore typically used in blends that show a good combination of flowability, melt stability and viscosity. In order to meet the requirements of the extrusion process, these thermoplastic polymer blends must, inter alia, have certain rheological properties. Important properties are a good flowability combined with a sufficient melt strength. Formulations that combine these advantages together with excellent processability are therefore of great interest. Thermoplastic polyester-based compositions for extrusion processes are described in the art. WO 2020/208053 A1 discloses polybutylene terephthalate molding compositions comprising a) 50 to 95 wt.-% of polybutylene terephthalate as component A, b) 5 to 50 wt.-% of a thermoplastic polymer having a melting point below 220 °C as component B, c) 0 to 45 wt.-% of filler as component C, d) 0 to 20 wt.-% of further additives as component D, wherein the 240799W001 2 total of components A to D is 100 wt.-%. The molding compositions may be used in thermoforming processes and exhibit reduced necking upon elongation of sheets or films of the polybutylene terephthalate molding composition. JPH04-275362 discloses a resin composition that contains (a) 50 to 95 wt.-% of polyester, (b) 1 to 49 wt.-% of polypropylene resin containing more than 2 wt.-% of polypropylene modified with unsaturated carboxylic acid, (c) 1 to 30 wt.-% of epoxy group containing ethylenic copolymer; and (d) styrenic block copolymer which is used in 1 to 15 parts by weight per 100parts by weight of total of (a), (b) and (c). However, the polypropylene resins claimed in this publication are modified with carboxylic acids to improve the compatibility with the polyester resin. WO 2021/148258 A 1 discloses a poly(butylene terephthalate) (PBT)-based composition, comprising a) PBT, and b) another thermoplastic polymer from the group consisting of polypropylene (PP), and/or at least one polyester which is selected from the group consisting of liquid crystal polyester (LCP), poly(ethylene terephthalate) (PET) including low melting point polyester, poly(butylene naphthalate) (PBN) and poly(ethylene naphthalate) (PEN). The PBT- based composition is taught to exhibit an increased electrolyte resistance, in particular in battery applications, especially in Li-ion batteries. However, in the compositions of WO 2021/148258 A1 typically comprise polypropylene in amounts of more than 15 wt.-%. WO 2023/88806 A1 discloses thermoplastic mixtures, containing: A) 30 to 100 wt.% of a thermoplastic blend consisting of: A-1) 65 to 75 wt.% of a polyester, A-2) 5 to 25 wt.% of a HD or LD polyethylene, A-3) 3 to 10 wt.% of an ionomer composed of at least one copolymerisate of: 3-1) 30 to 99 wt.% of ethylene, 3-2) 0 to 60 wt.% of one or more compounds selected from the group consisting of 1-octene, 1-butene, and propylene, and 3-3) 0.01 to 50 wt.% of one or more functional monomers selected from the group consisting of carboxylic acids, carboxylic acid anhydrides and carboxylic acid esters, with the proviso that the proportion of c