摘要:
The present invention relates to a polymer composition, comprising (i) a polypropylene-based matrix which comprises a polypropylene random copolymer prepared by copolymerization of propylene with an olefin comonomer, wherein the amount of olefin comonomer units is within the range of 0.2 wt% to 5 wt%, based on the weight of the polypropylene-based matrix, and (ii) an elastomeric copolymer of propylene and at least one olefin comonomer, the polymer composition having a storage modulus G' at a loss modulus G"=5 kPa of G'(5 kPa) ≤ 3100 Pa, measured at 220°C.
摘要:
The present invention relates to a polymer composition, comprising (i) a polypropylene homopolymer, (ii) a polypropylene random copolymer, prepared by copolymerization of propylene with an olefin comonomer and having an amount of olefin comonomer units of 0.2 to 5 wt%, and (iii) an elastomeric copolymer of propylene and at least one olefin comonomer,
the polymer composition having a tensile modulus, determined according to ISO 527-2/1 B at 1 mm/min. and 23°C, of at least 1200 MPa.
摘要:
A screw extruder has a body (1) forming a chamber (2) of two barrels (3,4) housing two counter-rotating axis-parallel rotors (5,6) a supply port (7) for the material to be mixed in the chamber (2) at one end of the body (1), a discharge port (8) for discharging the mixed material at the other end of the body, a conveying section (34) with screws for feeding the material from the supply port (7) downstream to a mixing section (44) which comprises at least two mixing zones (45,46), each mixing zone having at least one forward-conveying wing (14,15;21,22) and at least one backward-conveying wing (17,18;24,25) downstream of the forward-conveying wing (14,15;21,22) on each rotor (5,6).
摘要:
A pressureless pipe and polymer composition for making such a pipe as well as the use of the polymer composition for pressureless pipes and supplementary parts, are disclosed. The polymer composition is characterised in that the polymer comprises a multimodal ethylene polymer including a copolymer of ethylene and a C 4 -C 10 α-olefin comonomer; the ethylene polymer has a total density of at least 950 kg/m 3 and a MFR 5 of 0.2-2.0 g/10 min; the ethylene polymer has a modulus of elasticity, determined according to ISO 178 of more than 1200 MPa; the ethylene polymer has a resistance to slow crack growth, determined according to ASTM F 1473 of more than 1.5 hrs.
摘要翻译:公开了一种用于制造这种管子的无压管和聚合物组合物以及用于无压管和辅助部件的聚合物组合物的用途。 聚合物组合物的特征在于聚合物包含多乙烯聚合物,其包括乙烯和C 4 -C 10α-烯烃共聚单体的共聚物; 乙烯聚合物的总密度为至少950kg / m 3,MFR 5为0.2-2.0g / 10min; 乙烯聚合物的弹性模量根据ISO 178测定超过1200MPa; 乙烯聚合物具有耐缓慢裂纹生长,根据ASTM F 1473测定超过1.5小时。
摘要:
The present invention relates to a pipe or a supplementary pipe article comprising a polyethylene composition comprising a base resin which comprises (A) a first ethylene homo- or copolymer fraction, and (B) a second ethylene homo- or copolymer fraction, wherein fraction (A) has a lower average molecular weight than fraction (B), the base resin has a flexural modulus determined according to ISO 178 of 1000 MPa or higher, and the composition further comprises (C) an inorganic filler, and to the use of said composition for the production of a pipe or a supplementary pipe article.