Classifications

• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
  • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
  • D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
  • D01F6/46—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polyolefins

Definitions

• the present disclosure relates to fiber comprising a propylene based polymer composition comprising a propylene homopolymer and from 10 wt% to 35 wt% of a recycled polypropylene composition.
• an object of the present disclosure is a fiber comprising propylene based polymer composition
• a fiber comprising propylene based polymer composition
• propylene based polymer composition comprising:
• the propylene based polymer composition has a Melt Flow Rate, determined according to the method ISO 1133 (230° C, 2.16 kg), ranging from 15.0 g/10 min to 50.0 g/10 min and a distribution of molecular weight Mw/Mn ranging from 4.5 to 7.5 and
• an object of the present disclosure is a fiber comprising propylene based polymer composition
• a fiber comprising propylene based polymer composition
• propylene based polymer composition comprising:
• the recycled polypropylene composition contains preferably at least 50 wt%; more preferably at least 60 wt% ; even more preferably at least 70 wt% of derived units of propylene.
• the remaining comonomers can be ethylene; 1-butene; 1-hexene or 1-octene derived units; ethylene being preferred.
• Examples of propylene based polymer can be propylene homopolymer, propylene, ethylene heterophasic polymer, propylene ethylene 1-butene, propylene ethylene 1-hexene terpolymers and mixtures thereof.
• Post-Industrial Resin is the waste generated from the manufacturing process that is reclaimed or used again in the same material.
• PCR Post-Consumer Resin
• Post-Industrial Resin PIR
• PIR Post-Industrial Resin
• the recycled polypropylene composition does not contains limonene.
• the recycled polypropylene composition has the following features:
• PIR Post-Industrial Resin
• component B contains only propylene ethylene and 1-butene as comonomers.
• the propylene based polymer composition of the present disclosure is obtainable with a visbreaking process. With this process it is possible to increase the MFRfin and to narrow the molecular weight distribution so that the quality of the fibers is increased.
• the visbreakign process is preferably a chemical visbreaking.
• the chemical visbreaking of the propylene based polymer composition of the present disclosure is carried out in the presence of free radical initiators, such as the peroxides.
• the peroxides which are most conveniently used in the polymer visbreaking process have a decomposition temperature preferably ranging from 150°C to 250°C.
• Examples of said peroxides are di-tert-butyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne and 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, all of which are commercially available.
• the quantity of peroxide necessary for the visbreaking process preferably ranges from 0.001 to 0.5% by weight of the polymer, more preferably from 0.01 to 0.2 wt%.
• the fibers according to the present invention can be stable fibers or spunbond fibers.
• the fibers of the present invention can also contain additives commonly employed in the art, such as antioxidants, light stabilizers, heat stabilizers, nucleating agents, colorants and fillers.
• the fibers of the invention typically exhibit a value of tenacity at least equal to or higher than 20.0 cN/tex, preferably higher than 23.0. cN/tex, more preferably higher than 24.0 cN/tex.
• the fibers according to the present disclosure have a titre ranging from 1 to 8 dtex, preferably from 1.5 to 4.0 dtex.
• the fibers of the present disclosure can be efficiently spun at speeds that are typically higher than 3000 m/min, preferably higher than 3300 m/min, more preferably higher than 3500 m/min.
• the fibers of the present disclosure can be spun at temperatures generally varying from 200° to 300° C.
• the spinning temperature is lower than 250°C, even more preferably, the spinning temperature is comprised between 230° and 250°C.
• the fibers of the present disclosure preferably have an elongation at breack higher than 200 %; preferably higher than 220 %.
• the fibers of the present invention can be used for the manufacture of non-woven fabrics showing excellent properties.
• non-woven fabrics may be produced with various methods, preferably through the well-known spunbonding technique.
• the spunbonding process is a non-woven manufacturing technique, whereby polymers are directly converted into endless filaments and stochastically deposited to form a non-woven material.
• Xylene Solubles at 25°C have been determined according to ISO 16 152; with solution volume of 250 ml, precipitation at 25°C for 20 minutes, 10 of which with the solution in agitation (magnetic stirrer), and drying at 70°C.
• Melting point has been measured according to ISO 11357-3, at scanning rate of 20C/min both in cooling and heating, on a sample of weight between 5 and 7 mg., under inert N2 flow. Instrument calibration made with indium
• Molar content was transformed in weight content using monomers molecular weight.
• Tensile modulus, and elongation at break has been measured according to ISO 527-2, and according to ISO 1873-2.
• a third order polynomial fit was used for interpolate the experimental data and obtain the calibration curve.
• Data acquisition and processing was done by using Waters Empowers 3 Chromatography Data Software with GPC option.
• a 100 mm-long segment is cut and single fibers randomly chosen.
• Each single fiber is fixed to the clamps of a Dynamometer and tensioned to break with a traction speed of 20 mm/min for elongations lower than 100% and 50 mm/min for elongations greater than 100%, the initial distance between the clamps being of 20 mm.
• the ultimate strength (load at break) and the elongation at break are determined in machine (MD) direction.
• the maximum spinning speed gives indication of the spinnability of the propylene polymer composition of the invention.
• the value corresponds to the highest spinning rate that can be maintained for 30 minutes with no filament break dle weight is 0.1 mg
• Component A is a propylene homopolymer having an MFR (230°C and 2.16 kg) of 2.5 g/10 min and a fraction soluble in xylene at 25°C of 3.0 wt%
• Component B is a PIR recycled resin having the features reported in table 1 Table 1 Ex1 Ethylene Mol% 1.0. 1-butene Mol% 0.8 XEX Mol% 0.44 EEE Mol% 0.29 XBX Mol% 0.84 BBE Mol% 0.00 MFR, 230 °C 2.16 kg, g/10 min 8.3 Xs Wt% 7.0
• Comparative example 1 is a fiber prepared as above described by using HP561R a commercial grade sold by LyondellBasell having an MFR of 25.4 g/10 min.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Artificial Filaments (AREA)

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Citations (2)

• 2023
  • 2023-04-20 EP EP23169056.1A patent/EP4450685A1/de not_active Withdrawn

Patent Citations (2)

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