EP1062080A1 - Particules polymeres - Google Patents

Particules polymeres

Info

Publication number
EP1062080A1
EP1062080A1 EP99906209A EP99906209A EP1062080A1 EP 1062080 A1 EP1062080 A1 EP 1062080A1 EP 99906209 A EP99906209 A EP 99906209A EP 99906209 A EP99906209 A EP 99906209A EP 1062080 A1 EP1062080 A1 EP 1062080A1
Authority
EP
European Patent Office
Prior art keywords
polymer particles
polymer
particles
particles according
polycarbonate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99906209A
Other languages
German (de)
English (en)
Inventor
Christian Kords
Wilfried Kaschube
Burkhard Reitze
Jochen Mahrenholtz
Raimund Zimmermann
Wilfried Haese
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayer AG
Original Assignee
Bayer AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayer AG filed Critical Bayer AG
Publication of EP1062080A1 publication Critical patent/EP1062080A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/12—Making granules characterised by structure or composition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2069/00—Use of PC, i.e. polycarbonates or derivatives thereof, as moulding material

Definitions

  • the present invention relates to polymer particles which have a very specific ratio of volume to surface, a process for their production and their use for the production of molding compositions.
  • polymers in a wide variety of particle shapes and sizes. For example, Known polymer particles that have a diameter between 2.5 and 4 mm. But also polymers in powder form with a
  • Particle sizes between 100 and 2000 ⁇ m are available on the market.
  • Polymer particles are usually made by e.g. extruded in the form of a round or square thread and then cut according to the desired particle size with a cutting machine.
  • Polymers in powder form do not have this disadvantage, but are more complex to produce for the reasons mentioned above.
  • polymer powder is often disadvantageous in extrusion.
  • the polymer particles are melted, for example in a screw machine, by the friction of the particles against one another and the resulting heat, and then extruded into the desired shape.
  • the frictional resistance of the particles to one another is often too low and the heat generated is therefore not sufficient to achieve the corresponding melting temperatures anywhere in the polymer.
  • Reach material 201 Accordingly, the melting of the polymer powder takes place either not at all or incompletely at certain points, so that the resulting molding compositions often have optical and / or mechanical defects.
  • the object of the present invention is therefore to provide polymer particles which have neither the disadvantages of large polymer particles nor of polymers in powder form.
  • the object is achieved according to the invention by polymer particles in which the ratio of volume to surface is ⁇ 0.5 mm and the length of which is between 1.5 and 3 mm.
  • the length in the sense of the invention is the distance between the two cut surfaces.
  • the polymer particles preferably have a vpm volume to surface area ratio which is between 0.49 and 0.38 mm.
  • the ratio of volume to surface area of the particles between 0.43 and 0.3 mm is very particularly preferred.
  • These cylindrical or approximately cylindrical polymer particles particularly preferably have a length between 2.0 and 2.8 mm, very particularly preferably between 2.4 and 2.6 mm.
  • the polymer particles can have any shape.
  • the polymer particles preferably have the shape of a cylinder or an elliptical cylinder, the end faces not needing to be straight due to the size reduction process, so that the polymer particles very particularly preferably have only approximately the shape of a cylinder.
  • the diameter of the cylindrical particles is likewise preferably between 2.0 and 3.3 mm, particularly preferably between 2.3 and 2.7 mm.
  • the long axis of the ellipse preferably has a length of 2.2 to 3.5 mm, particularly preferably a length of 2.3 to 2.7 mm, while the short axis of the ellipse preferably 1, 5 to
  • the polymer particles according to the invention can consist of any polymer known to the person skilled in the art. However, they are preferably thermoplastic polymers. According to the invention, thermoplastics are all plastics which become fluid under the influence of pressure and temperature. Examples include polystyrene, hydrogenated polystyrene, polyurethane, polyamide, polyester, polyacetal, polyacrylate, polycarbonate, polyethylene, polypropylene, polyvinyl chloride, styrene-acrylonitrile and their copolymers and corresponding blends.
  • polymer particles according to the invention are preferably made of polycarbonate.
  • polycarbonates are both homopolycarbonates and copolycarbonates.
  • the polycarbonates can be linear or branched in a known manner.
  • polycarbonates which contain both acid residues of carbonic acid and acid residues of aromatic dicarboxylic acids built into the molecular chain, are, to be precise, aromatic polyester carbonates.
  • thermoplastic, aromatic polycarbonates They should be subsumed under the generic term of thermoplastic, aromatic polycarbonates.
  • the polymer particles according to the invention are preferably produced by continuously extruding the molten polycarbonate into the desired shape, preferably into an endless cylinder, and then comminuting it. There are many different procedures for shredding.
  • the polymer can e.g. immediately after leaving the extruder into the particles according to the invention.
  • the polymer is preferably first cooled after extrusion, so that it is at least partially cured and then cut.
  • the polymer particles according to the invention are inexpensive to manufacture and have very good conveying properties, e.g. from silos or in pipelines. Molding compositions which have been produced using the polymer particles according to the invention have significantly fewer optical or mechanical defects than molding compositions which have been produced using polymers in powder form.
  • the present invention therefore also relates to the use of the polymer particles according to the invention for the production of molding compositions.
  • Molding compositions in the sense of the invention are all molding compositions known to the person skilled in the art which can be produced with the abovementioned polymers. - 5 -
  • optical articles made of polycarbonate are particularly preferably produced with the polymer particles according to the invention.
  • Optical articles in the sense of the invention are glasses of any kind, preferably lenses or spectacle glasses, but also optical mass storage devices such as the CD or the CD-R.
  • the particles with the properties according to the invention have satisfactory funnel outlet behavior even with a diameter of 15 mm.
  • Cut areas of 3.1 mm performed. This results in a volume to surface ratio of 0.5 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

L'invention concerne des particules polymères, pour lesquelles le rapport du volume à la surface est inférieur à 0,5 mm et dont la longueur se situe entre 1,5 et 3 mm. L'invention concerne en outre un procédé de préparation desdites particules polymères et leur utilisation pour produire des matières de moulage.
EP99906209A 1998-02-09 1999-01-27 Particules polymeres Withdrawn EP1062080A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19805077 1998-02-09
DE19805077 1998-02-09
PCT/EP1999/000531 WO1999039888A1 (fr) 1998-02-09 1999-01-27 Particules polymeres

Publications (1)

Publication Number Publication Date
EP1062080A1 true EP1062080A1 (fr) 2000-12-27

Family

ID=7857068

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99906209A Withdrawn EP1062080A1 (fr) 1998-02-09 1999-01-27 Particules polymeres

Country Status (5)

Country Link
EP (1) EP1062080A1 (fr)
KR (1) KR20010040764A (fr)
CN (1) CN1290204A (fr)
AU (1) AU2622399A (fr)
WO (1) WO1999039888A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6372175B1 (en) 1999-09-17 2002-04-16 General Electric Company Resin pellets for injection molding
US6355766B1 (en) 2000-04-28 2002-03-12 General Electric Company Polycarbonate compositions for data storage media
US10358533B2 (en) * 2015-12-23 2019-07-23 Mitsubishi Chemical Corporation Resin composition pellet

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3421647A1 (de) * 1984-06-09 1985-12-12 Bayer Ag, 5090 Leverkusen Verfahren zur herstellung von polycarbonat-spritzgussformkoerpern
JPS61250026A (ja) * 1985-04-27 1986-11-07 Mitsubishi Gas Chem Co Inc ビ−ズ状ポリカ−ボネ−ト固形粒子の水スラリ−液の製造法
JPH0688251B2 (ja) * 1986-01-08 1994-11-09 三菱瓦斯化学株式会社 ポリカーボネート樹脂ペレットおよびその製法
JPS62169605A (ja) * 1986-01-22 1987-07-25 Teijin Chem Ltd ポリカ−ボネ−トの造粒方法
JPH0618890B2 (ja) * 1986-06-23 1994-03-16 三菱化成株式会社 ポリカ−ポネ−ト成形材料
DE8803364U1 (de) * 1988-03-12 1988-05-05 Bloch, Klaus, 5205 St Augustin Strahlmittel aus thermoplastischem Kunststoff
GB8818425D0 (en) * 1988-08-03 1988-09-07 Wiggins Teape Group Ltd Plastics material
WO1996026241A2 (fr) * 1995-02-14 1996-08-29 The Dow Chemical Company Pastilles de polymeres exemptes de vides, leur procede de preparation et procedes de moulage ameliores, et articles moules ainsi produits

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9939888A1 *

Also Published As

Publication number Publication date
AU2622399A (en) 1999-08-23
CN1290204A (zh) 2001-04-04
KR20010040764A (ko) 2001-05-15
WO1999039888A1 (fr) 1999-08-12

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