Masterbatches for Preparing Composite Materials with Enhanced Conductivity Properties, Process and Composite Materials Produced

Patent metadata

Field	Value
Publication number	US-2019378634-A1
Application number	US-201916548588-A
Country	US
Kind code	A1
Filing date	Aug 22, 2019
Priority date	Aug 1, 2013
Publication date	Dec 12, 2019
Grant date	—

Abstract

The present invention relates to a masterbatch to for use in a process of preparing a composite material, the masterbatch comprising a blend of a first amorphous polymer with carbon nanotubes, and at least 5% by weight of carbon nanotubes based on the total weight of the masterbatch, preferably from 5% to 15%, wherein the masterbatch exhibit a high load melt flow index HLMI1 of less than 40 g/10 min determined at 200° C. under a load of 21.6 kg according to ISO1133 and the first amorphous polymer has a melt flow index MFI1 of at least 10 g/10 min determined at 200° C. under a load of 5 kg according to ISO1133H. The invention also relates to the process for preparing such masterbatch and to process of preparing a composite material using said masterbatch.

First claim

1 .- 15 . (canceled)

16 . A process for preparing a composite material comprising a polymer composition and carbon nanotubes, characterized in that said polymer composition comprises a mixture of a first and a second amorphous polymer and the composite material comprises from 0.05 to 1.95% by weight of carbon nanotubes based on the total weight of the composite material as determined according to ISO 11358, and in that the composite material has a surface resistivity of at most 1×10 4 Ohm/sq, said process comprising the steps of:
b. providing a masterbatch comprising a first amorphous polymer and at least 5%, and preferably from 5% to 15%, by weight of carbon nanotubes based on the total weight of the masterbatch as determined according to ISO 11358, and wherein the first amorphous polymer has a melt flow index MFI1 of at least 10 g/10 min determined at 200° C. under a load of 5 kg according to ISO1133H, wherein the first amorphous polymer is selected from the group consisting of polystyrene, modified-polystyrene, acrylonitrile-butadiene-styrene, polycarbonate, styrene acrylonitrile, poly(methyl methacrylate), poly(vinyl chloride), polybutadiene, polybutylene terephthalate, poly(p-phenylene oxide), polysulfone, polyethersulfone, polyethylenimine, polyphenylsulfone, acrylonitrile styrene acrylate and any combination thereof, wherein the masterbatch comprises at least 80% by weight of the first amorphous polymer, and wherein the masterbatch comprises a surface resistivity of at most 1×10 2 Ohm/sq as determined according to CEI 60167;
c. providing a second amorphous polymer having a glass transition temperature Tg2;
d. blending together the masterbatch and the second amorphous polymer by extrusion in an extruder at a barrel temperature ranging from Tg2+100° C. to Tg2+200° C., preferably ranging from Tg2+120° C. to Tg2+180° C.,
the glass transition temperature being determined according to according to ISO 11357-2:2013.

17 . The process according to claim 16 wherein the masterbatch comprises a blend of the first amorphous polymer with carbon nanotubes, at least 5% by weight of carbon nanotubes based on the total weight of the masterbatch as determined according to ISO 11358, and having a high load melt flow index HLMI1 of less than 40 g/10 min determined at 200° C. under a load of 21.6 kg according to ISO1133, the masterbatch being characterized in that the first amorphous polymer has a melt flow index MFI1 of at least 10 g/10 min determined at 200° C. under a load of 5 kg according to ISO1133H.

18 . The process according to claim 16 characterized in that the process includes, before (b), a process of preparing the masterbatch comprising:
a1 providing carbon nanotubes;
a2. providing an first amorphous polymer, said first amorphous polymer having a glass transition temperature Tg1, and a melt flow index MFI1 of at least 10 g/10 min determined at 200° C. under a load of 5 kg according to ISO1133H;
a3. blending together said carbon nanotubes and said first amorphous polymer by extrusion in an extruder at a barrel temperature ranging from Tg1 to Tg1+80° C., preferably Tg1+5° C. to Tg1+50 ° C., the glass transition temperature being determined according to ISO 11357-2:2013.

21 . The process according to claim 16 , the first amorphous polymer having a melt flow index MFI1 and second amorphous polymer having a melt flow index MFI2, the process being characterized in that it further comprises the step of selecting the first and second amorphous polymer so that MFI1 has a value of at least twice the value of MFI2.

22 . The process according to claim 16 characterized in that said composite material comprises from 0.05 to 0.95% by weight of carbon nanotubes based on the total weight of the composite material as determined according to ISO 11358.

23 . The process according to claim 16 , wherein the first amorphous polymer further comprises 0.01 to 4.0 by weight of one or more additive based on the total weight of the masterbatch, the one or more additive being selected from waxes, tristearin, zinc stearate, calcium stearate, magnesium stearate, erucyl amide, oleic acid amide, ethylene-acrilyc acid copolymer, ethylene vinyl acetate copolymer and cetyl trimethyl ammonium bromide.

Assignees

• Total Res & Technology Feluy

Inventors

• Rousseaux Dimitri
• Lhost Olivier
• Lodefier Philippe
• Scandino Eddi

Classifications

• B29K2105/16

  Fillers · CPC title

• C08J2381/06

  Polysulfones; Polyethersulfones · CPC title

• C08J2325/10

  with conjugated dienes · CPC title

• B32B27/06

  as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08)} · CPC title

• C08J2309/00

  Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons · CPC title