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KR-102962791-B1 - Butene-1 polymer composition with short crystallization time

KR102962791B1KR 102962791 B1KR102962791 B1KR 102962791B1KR-102962791-B1

Abstract

The present invention relates particularly to a butene-1 polymer composition suitable for manufacturing pipes, wherein A) 97.5% to 99.85% by weight of the total weight, B) butene-1 polymer or ^) 0.15% to 2.5% by weight of the total weight, c is in the form of particles in which the volume-based γ particle size distribution Dv (0.95) is 45 ^im or less, optionally C) 0.01 to 2% by weight of ethylene polymer; ^ is in the form of particles in which the amount of C) is 100% of the total weight of A) + B) + C).

Inventors

  • 구에라, 실비아
  • 마르키니, 로베르타
  • 스파타로, 스테파노

Assignees

  • 바셀 폴리올레핀 이탈리아 에스.알.엘

Dates

Publication Date
20260508
Application Date
20210728
Priority Date
20200731

Claims (11)

  1. A): A polymer composition selected from butene-1 polymer, or crystalline butene-1 homopolymer, copolymer, or a combination thereof, comprising 97.5% to 99.85% by weight when calculated based on the total weight of A) and B) as 100% by weight, and B): 0.15% to 2.5% by weight when the total weight of A) and B) is calculated as 100% by weight, comprising talc in particulate form having a (volumetric) particle size distribution Dv (0.95) based on a volume of 45μm or less, 35μm or less, 25μm or less, or 20μm or less as determined by laser diffraction, and ad lib, C): A butene-1 polymer composition comprising 0.01% to 2% by weight of ethylene polymer when calculated with the total weight of A)+B)+C) as 100% by weight.
  2. In paragraph 1, Component B) is a butene-1 polymer composition having at least one of the following volume-based particle size distribution characteristics: Dv(0.99) is 100μm or less, or 50μm or less, or 30μm or less, and in any case, the lower limit is 10μm; Dv(0.90) is 20μm or less or 15μm or less, and in either case, the lower limit is 3μm; Dv(0.50) is 10μm or less or 8μm or less, and the lower limit is 2μm; Dv (0.10) is 5 μm or less or 4 μm or less, and the lower limit is 1 μm.
  3. In paragraph 1 or 2, A butene-1 polymer composition characterized by a crystallization temperature Tc of 80°C or higher, wherein the crystallization temperature Tc is measured by the DSC method at a scanning rate of 10°C/min after one melting cycle.
  4. In paragraph 1 or 2, A butene-1 polymer composition characterized by a melting temperature of 90 to 125°C or 100 to 125°C, wherein the melting temperature is measured by the DSC method at a scanning rate of 10°C/min during a second heating run after the first melting and cooling.
  5. In paragraph 1 or 2, A butene-1 polymer composition having an MIE of 100 to 0.01 g/10 min, wherein MIE is a melt flow index at 190°C/2.16 kg measured according to ISO 1133-2:2011.
  6. In paragraph 1 or 2, Butene-1 polymer composition having at least one of the following additional features: Crystallization half-time of 90–160 seconds at 90℃, or 100–150 seconds; Flexural modulus of 450–650 MPa or 500–600 MPa measured in accordance with standard ISO 178:2019 10 days after forming; Pulling modulus of 500–800 MPa, or 560–750 MPa, measured by DMTA analysis on a 1 mm thick compression-molded plate at 23°C in accordance with ISO 6721-4:2019; Izod impact strength of 3–15 kJ/ m² or 3–10 kJ/ m² at 23°C measured in accordance with ISO 8986-2:2009 and ISO 180:2000; Izod impact strength of 2–10 kJ/ m² or 2–8 kJ/ m² at 0°C measured in accordance with ISO 8986-2:2009 on a compression plaque in accordance with ISO 180:2000.
  7. In paragraph 1 or 2, The butene-1 polymer composition, wherein the butene-1 polymer component A) has a crystallization temperature Tc of 75°C or higher, and the crystallization temperature Tc is measured by the DSC method at a scanning rate of 10°C/min after one melting cycle.
  8. In paragraph 1 or 2, The butene-1 homopolymer and copolymer A) are butene-1 polymer compositions having an isotacticity of 90 to 99%, or 95 to 99%, as measured by NMR analysis in mmmmmm pentads/total pentads.
  9. In paragraph 1 or 2, The above ethylene polymer component C) is a butene-1 polymer composition selected from HDPE, LLDPE, LDPE, and mixtures thereof.
  10. A manufactured article comprising the polyolefin composition of claim 1 or 2.
  11. In Article 10, A manufactured article in the form of a pipe or pipe joints.

Description

Butene-1 polymer composition with short crystallization time The present disclosure relates to a butene-1 polymer composition having a shortened crystallization time. Butene-1 polymers are known in the field and possess wide applicability. In particular, butene-1 homopolymers and copolymers with high crystallinity typically exhibit excellent performance in terms of pressure resistance, creep resistance, and impact strength, and are also characterized by being useful for manufacturing pipes that can replace metal pipes. One of the important requirements for such applications in the pipe industry is an excellent combination of flexibility and tensile strength. Furthermore, in a pipe forming process typically performed by extrusion to enable high speed during extrusion, the crystallization time must be sufficiently short. More generally, single-crystallization time is beneficial in many polymer molding processes and is advantageous for increasing processing speed. In this field, it is known that the addition of nucleating agents affects the aforementioned performance. These nucleating agents are typically foreign substances (non-homogeneous nucleation) that promote crystallization from the polymer melt. Although many nucleating agents exhibiting the above effects are found in crystalline polymers, in the field of olefin nucleation, a nucleating agent effective for one type of polymer may also be ineffective for closely related polymers, and for this reason, it is difficult to identify the most suitable nucleating agent for a specific polymer, particularly a butene-1 polymer that has been crystallized into at least two different crystalline forms. Furthermore, the required performance may vary depending on the application. For example, excessively high bending stiffness (high bending modulus) during pipe use This is because it becomes a drawback, and thus a certain degree of flexibility is required as described above. However, if the value of the bending modulus is too low, the long-term pressure resistance decreases. Furthermore, an excessively low crystallization time also becomes a drawback, making it difficult to consistently produce pipes with the desired shape and performance. To this end, this field is devising to develop nucleating agents that achieve the most balanced mechanical and processing performance depending on the type of polymer used or the required application. For example, according to JP2007186563, by adding ethylene bistiarinamide or talc to butene-1 polymer, it is possible to balance the performance when applying pipes. It was found that a butene-1 polymer composition having a particularly valuable balance of crystallization time, bending modulus, and tensile strength is obtained by adding a relatively low amount of talc having a specific particle size. To this end, the present disclosure A): A polymer composition selected from butene-1 polymer, or crystalline butene-1 homopolymer, copolymer, or a combination thereof, in an amount of 97.5% to 99.85% by weight, preferably 98% to 99.8% by weight, more preferably 98% to 99.5% by weight, based on the total weight of A) and B), and B): Talc in particulate form, comprising 0.15% to 2.5% by weight, preferably 0.2% to 2% by weight, more preferably 0.5% to 2% by weight, relative to the total weight of A) and B), having a volume-based (volumetric) particle size distribution Dv (0.95) determined by laser diffraction of 45 μm or less, preferably 35 μm or less, more preferably 25 μm or less, particularly 20 μm or less, wherein in all cases the lower limit is preferably 5 μm, and optionally C): comprising 0.01 wt% to 2 wt%, preferably 0.01 wt% to 1 wt%, more preferably 0.01 wt% to 0.5 wt%, particularly 0.01 wt% to 0.2 wt% of ethylene polymer, The amount of C) refers to the total weight of A)+B)+C), and provides a butene-1 polymer composition with a total of 100%. "Crystallistic butene-1 homopolymer and copolymer" means that when measured by differential scanning calorimetry (DSC), the homopolymer and copolymer A) exhibit at least one crystallization peak corresponding to the crystallization temperature Tc . Accordingly, when DSC measurements are performed, the butene-1 polymer composition of the present invention, comprising components A), B), and any C), also exhibits at least one crystallization peak and thus exhibits a crystallization temperature Tc . Preferably, the T c value of butene-1 polymer component A) is 75°C or higher, particularly in the range of 75°C to 85°C. Preferably, the T c value of butene-1 polymer component A) is 80°C or higher, particularly in the range of 80°C to 90°C. The Tc value of the butene-1 polymer composition of the present invention is preferably at least 2°C higher than the Tc value of butene-1 polymer component A), particularly 2°C to 5°C higher. The crystallization temperature is measured after one melting cycle, and the injection rate is 10℃/min. Therefore, the crystallization temperature (e.g., using previous DSC) i