WO1990004463A1 - Pastilles de plastique enrobees d'un auxiliaire de traitement et procede d'enrobage - Google Patents

Pastilles de plastique enrobees d'un auxiliaire de traitement et procede d'enrobage Download PDF

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Publication number
WO1990004463A1
WO1990004463A1 PCT/US1989/004575 US8904575W WO9004463A1 WO 1990004463 A1 WO1990004463 A1 WO 1990004463A1 US 8904575 W US8904575 W US 8904575W WO 9004463 A1 WO9004463 A1 WO 9004463A1
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WO
WIPO (PCT)
Prior art keywords
pellet
processing aid
carbon atoms
blender
weight percent
Prior art date
Application number
PCT/US1989/004575
Other languages
English (en)
Inventor
Paul T. Louks
Original Assignee
The Dow Chemical Company
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 The Dow Chemical Company filed Critical The Dow Chemical Company
Priority to KR1019900701291A priority Critical patent/KR900701406A/ko
Publication of WO1990004463A1 publication Critical patent/WO1990004463A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • 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
    • B29B9/16—Auxiliary treatment of granules
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/203—Solid polymers with solid and/or liquid additives
    • 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
    • B29B9/16—Auxiliary treatment of granules
    • B29B2009/163—Coating, i.e. applying a layer of liquid or solid material on the granule
    • 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
    • B29K2019/00—Use of rubber not provided for in a single one of main groups B29K2007/00 - B29K2011/00, as moulding material
    • 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
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • 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
    • B29K2025/00—Use of polymers of vinyl-aromatic compounds or derivatives thereof as moulding material
    • 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
    • B29K2035/00—Use of polymers of unsaturated polycarboxylic acids or derivatives thereof as moulding material
    • 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
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • 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
    • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material

Definitions

  • the present invention relates to pellets of a plastic having improved extrusion properties.
  • Processing aids are conventionally blended into the plastic prior to fabrication into a pellet, However, it has been found that a certain lag time period exists, after exposure to desirable processing temperatures, before the blended processing aids func ⁇ tion effectively. It is during the lag time period, that the plastic is particularly susceptible to decomposition upon exposure to desirable processing temperatures.
  • plastic pellets have had processing aids applied to their surfaces.
  • processing aids are applied by spraying droplets of processing aid on the pellet surface. While such techniques have had some success, these techniques do not consistently provide uniform pellet surface coating.
  • the present invention concerns a process for preparing a pellet having improved extrudability, which process comprises the steps of: (a) providing a plastic in pellet form, and a processing aid having a softening point between ambient temperatures and below the processing temperature of the plastic in pellet form; (b) charging the pellet into a high intensity blender, said blender having an impeller; (c) rotating the blender impeller at a speed and for a period of time effective to raise the temperature of the pellet surface to between about 5°C and 10°C below the softening point of the processing aid; (d) charging the processing aid into the blender such that the processing aid contacts the heated pellet surface; and (e) rotating the blender impeller at a speed and for a period of time effective to raise the temperature of the pellet surface to a temperature above the softening point of the processing aid, and to coat a portion of the pellet surface by fusing the processing aid thereto.
  • the present invention concerns a composition, in the form of an extrudable pellet, which comprises a plastic, said pellet having a processing aid fused on the surface thereof at a level effective to improve the extrudability of the pellet.
  • the process and composition according to the present invention improves the extrudability of the plastic pellets.
  • the pellets are considered to possess improved extrudability, i.e., less carbonaceous material contamination on the melt processing equipment, e.g., on an extruder screw heel; and a lower mechanical energy to extrude than a pellet, which does not have processing aids coated on its sur ⁇ face in a manner according to the present invention.
  • the plastics which may be employed according to the present invention include any plastic which may be pelletized.
  • the plastic is formed by blending a poly ⁇ mer, prior to pelletization, with a variety of additives incorporated therewith to form a plastic.
  • Suitable polymers are the olefin polymers such as homopolymers and copolymers of ⁇ -mono- olefins (e.g., ethylene, propylene, butene-1, isobutyl- ene, 1-pentene, 1-hexene, 1-octene, and the like); and ⁇ -monoolefin/ ⁇ -monoolefin copolymers (e.g., ethylene/propylene copolymers).
  • ⁇ -mono- olefins e.g., ethylene, propylene, butene-1, isobutyl- ene, 1-pentene, 1-hexene, 1-octene, and the like
  • ⁇ -monoolefin/ ⁇ -monoolefin copolymers e.g., ethylene/propylene copolymers
  • Additional suitable polymers include those based on substituted ⁇ -monoolefins (e.g., ⁇ -monoolefins having from 4 to 12 carbon atoms wherein the substituents can be halo, alkyl or haloalkyl having from 1 to 12 carbon atoms; ⁇ -alkenyl having 2 to 12 carbon atoms; acyl having 1 to 12 carbon atoms; carboxylate having from 1 to 12 carbon atoms; alkoxyl having from 1 to 12 carboa atoms; and aryloxy having from 6 to 12 carbon atoms).
  • substituted ⁇ -monolefins e.g., ⁇ -monolefins having from 4 to 12 carbon atoms wherein the substituents can be halo, alkyl or haloalkyl having from 1 to 12 carbon atoms; ⁇ -alkenyl having 2 to 12 carbon atoms; acyl having 1 to 12 carbon atoms; carboxylate having from 1 to
  • Exemplary substituted ⁇ -monoolefins are vinyl chloride, vinyl bromide, vinylidene chloride, acrylic acid, methacrylic acid, ethyl acrylate, n-butyl acrylate, i-butyl acrylate, diethyl acrylate, diethyl maleate, ethyl hydrogen maleate, methyl ethacrylate, dibutyl itaconate, vinyl acetate, vinyl propionate, vinyl benzoate, vinyl ethyl ether, methyl vinyl ketone, acrylamide, acrylonitrile and the like.
  • suitable polymers include those based on carboxylic acids having from 3 to 8 carbon atoms (e.g., ethylene vinyl acetate and ethylene acrylic acid), and partially hydrolyzed copolymers thereof (e.g., ethylene vinyl alcohol); alkyl or haloalkyl esters of carboxylic acid wherein the alkyl or haloalkyl has from 1 to 12 carbon atoms; ⁇ -alkenyls having 2 to 12 carbon atoms; acyls having 1 to 12 carbon atoms; carboxylates having from 1 to 12 carbon atoms; alkoxyls having from 1 to 12 carbon atoms; aryloxys having from 6 to 12 carbon atoms; rubbery ethylene-propylene-diene terpolymers; polyesters and copolyesters such as those polyesters and copolyesters whose synthesis employs at least one polyhydric alcohol and at least one dibasic acid (e.g., polyethylene terephthalate, and the like); the poly--
  • thermally sensitive plastics refers to any plastic which exhibits an undesirable change in properties, particularly physical properties, upon exposure to desirable processing temperatures.
  • thermally sensitive plastics include polyvinylidene halide copolymers, polyvinyl halide copolymers and ethylene vinyl alcohol copolymers.
  • Suitable additives include, for example, colorants, pigments, non-elastomeric reinforcing agents, fillers, antioxidants, stabilizers, etc., as long as these do not detrimentally affect the resulting uniformity of coating and completeness of surface cov ⁇ erage.
  • the process comprises physically blending the interpolymer with the additives to form a mixture.
  • pellets or pellets refer to particles having a minimum cross-sectional dimension of at least 1/32 inch, preferably at least 1/16 inch and most preferably at least 1/8 inch, said pellets suitably have a maximum cross-sectional dimension of at least 1/2 inch, preferably at least 3/8 inch and most preferably at least 1/4 inch.
  • Exemplary of a method suitable for use in forming the pellets of the mixture is extrusion through a strand die and pelletization by chopping the extruded strand into pellets.
  • processing aid is meant any component which is employed to improve extrusion performance.
  • the surface of the pellet will be coated with a processing aid, wherein the processing aid will be in an amount of between 0.001 weight percent to 2 weight percent, said weight percents based on the weight of the pellet; preferably in an amount of between 0.01 weight percent to 1.5 percent, said weight percents based on the weight of the pellet; and most preferably in an amount of between 0.1 weight percent to 0.7 weight percent, said weight percents based on the weight of the
  • the inventor has found that the more processing aid which is coated on the pellet surface the more of a decrease in particulate degradation will be seen in the extrudate.
  • the pellet surface will be uniformly coated with the processing aid, that is to
  • the processing aid is applied in quantities excessive for the processing aid selected, the viscosity of the processing aid, the size of the pellet and the type and size of the equipment through which the pellet is extruded, the feeding of the pellet into the melt processing equipment may be impaired because of insufficient friction in the feed zone; or the excess amount of processing aid may form globules on the pellet surface.
  • the processing aids coated on the pellet sur- face are those generally used for the conventional melt processing of plastics in either powder or pellet form.
  • the processing aid is selected to have a softening point between ambient temperatures and below the processing temperature of the plastic in pellet form.
  • the processing aid should have, within the preferred range, a softening point slightly above ambient temperatures to allow for rapid functioning and yet for easy handling, e.g., low pellet surface tackiness, within the above parameters, the specific processing aid selected will be a matter of choice for the skilled artisan, depending upon the desired results.
  • Exemplary processing aids include lubricants and olefin polymers.
  • the choice of specific processing aids for specific plastics will -be a matter of choice well within the means of one skilled in the art.
  • Exem ⁇ plary factors in selecting a processing aid although not all factors are important for all polymers, include melt adhesion, fusion delay, viscosity reduction and an extrusion rate increase at a given rpm.
  • Lubricants include both internal and external lubricants which improve extrusion performance of the 5 plastic.
  • internal lubricant is meant any of the classes of compounds that have heretofore been employed as internal lubricants in plastics. Although not intended to be bound by theory, the lubricants are
  • compositions may perform functions in
  • external lubricant any of the class of compounds that have heretofore been employed as 0 external lubricants in plastics.
  • the lubricants are classified as “external” because they are believed to be at least partially incompatible with the molten polymer.
  • the ⁇ lubricant will therefore migrate to the surface of the molten polymer and form a film between the polymer and the heated metal surface of the extruder, mill or other equipment used to process the polymer composition. This film significantly reduces the tendency of the polymer 0 to adhere to these metal surfaces and degrade.
  • the compositions may perform functions in addition to that mechanism referred to as external lubrication.
  • Exemplary lubricants include fatty acids (e.g., stearic acid); esters (e.g., fatty esters, wax esters, glycerol esters, glycol esters, fatty alcohol esters, and the like); fatty alcohols (e.g., n-stearyl alcohol); fatty amides (e.g., N,N'-ethylene bis stearamide); metallic salts of fatty acids (e.g., calcium stearate, zinc stearate, magnesium stearate, aluminum stearate, sodium stearate, tin stearate, sodium lauryl sulfate, and the like); and polyole in waxes (e.g., paraffinic, nonoxidized and oxidized polyethylene and the like).
  • esters e.g., fatty esters, wax esters, glycerol esters, glycol esters, fatty alcohol esters, and the like
  • fatty alcohols e.g., n
  • olefin polymer includes homopolymers and copolymers of ⁇ -monoolefins and substituted ⁇ -mono ⁇ olefins, particularly ⁇ -monoolefins or substituted ⁇ -monoolefins having from 4 to 12 carbon atoms.
  • Exem ⁇ plary ⁇ -monoolefin polymers include polyethylene (e.g., 15 ultra-low density polyethylene, low density polyethyl ⁇ ene, linear low density polyethylene, medium density polyethylene, high density polyethylene); polypropylene; poly(butene-1) , poly(isobutylene); poly(1-pentene) ; polyO-hexene) and polyO-octene) . 20
  • Substituted ⁇ -monoolefins include those wherein the substituents can be halo, alkyl or haloalkyl having from 1 to 12 carbon atoms; carboxylic acid having from 3 p j- to 8 carbon atoms; alkyl or haloalkyl ester of car ⁇ boxylic acid wherein alkyl or haloalkyl has from 1 to 12 carbon atoms; ⁇ -alkenyl having 2 to 12 carbon atoms; acyl having 1 to 12 carbon atoms; carboxylate having from 1 to 12 carbon atoms; alkoxyl having from 1 to 12
  • the ⁇ -monoolefins and substituted ⁇ -monoolefins may also be copolymerized with a variety of suitable comonomers such as carboxylic acids having from 3 to 8 carbon atoms (e.g., ethylene vinyl acetate, and ethylene acrylic acid); alkyl or haloalkyl esters of carboxylic acid wherein alkyl or haloalkyl has from 1 to 12 carbon atoms; ⁇ -alkenyls having 2 to 12 carbon atoms; acyls having 1 to 12 carbon atoms; carboxylates having from 1 to 12 carbon atoms; alkoxyls having from 1 to 12 carbon atoms; aryloxys having from 6 to 12 carbon atoms; and ⁇ -monoolefin/ ⁇ -monoolefin copolymers (e.g., ethylene/propylene copolymers).
  • suitable comonomers such as carboxylic acids having from 3 to 8 carbon atoms (
  • the processing aid is then charged into the blender for further mixing of the preheated pellet and processing aid until the processing aid fuses onto the pellet surface.
  • pellets are prepared for coating by being mixed in a high intensity blender.
  • high intensity blender is meant mixers that can apply about 10 horse power per cubic foot of material with high shear rate,
  • Exemplary high intensity blenders include Banbury mixers, Prodex- -Henschel mixers, and Welex-Papenmeier mixers.
  • Such blenders typically have an impeller for mixing and applying energy to the batch, and a baffle for directing the motion of the product to the center of the vortex.
  • Such blenders also have a jacket sur ⁇ rounding the mixing bowl so that cooling may be applied.
  • the blender impeller is run at a tip speed of between 2000 feet per minute (fpm) to 4000 fpm, preferably between 2500 fpm to 3000 fpm.
  • the degree of deflection of the blender baffle may be adjusted from 45° to 0°, and preferably between 15° to 0°, where 0° refers to a radial orientation.
  • the pellet surface will be heated to a tem ⁇ perature of at least about 10°C, preferably about 5°C, below the temperature at which the processing aid will soften and fuse.
  • a tem ⁇ perature of at least about 10°C, preferably about 5°C, below the temperature at which the processing aid will soften and fuse.
  • the pellets will be mixed until their surface temperature is above that of the temperature required to soften the processing aid, but below the softening point of the plastic.
  • Water may be passed through a water jacket to maintain control of the heating of the pellet surface at a temperature of between the softening point of the processing aid and below the softening point of the plastic.
  • the pellet After being surface coated, the pellet then may be melt processed and extruded into any suitable final product.
  • the process of the present invention can be used to form a variety of films or other articles.
  • the films and articles may be fabricated with conventional coextru- sion, e.g, feedblock coextrusion, multimanifold die coextrusion or combinations of the two; injection molding; extrusion molding and lamination techniques.
  • Articles formed therefrom include blown and cast, mono and multilayer, films; rigid and foam sheet; tubes; pipes; rods; fibers and various profiles.
  • Lamination techniques are particularly suited to produce multi-ply sheets.
  • specific laminating techniques include fusion, wet combining or heat reac ⁇ tivation. Fusion comprises bonding self-sustaining lamina together by applications of heat and pressure.
  • Wet combining comprises laminating two or more plies by using a tie coat adhesive, which is applied wet; driving off the liquid and combining, by subsequent pressure laminating, in one continuous process.
  • Heat reactivation comprises combining a precoated film with another film by heating and reactivating the precoat adhesive so that it becomes receptive to bonding after subsequent pressure laminating.
  • PVdC A pellet of a polymeric composition compris ⁇ Pellet ing a 96.5 base resin, 1.5$ ethylene vinyl acetate, "1 .2% tetrasodium pyrophosphate and 0.8$ epoxidized soybean oil.
  • the base resin is polymerized from a monomer mixture con ⁇ taining 80 weight percent vinylidene chloride and 20 weight percent vinyl chloride, said resin having a major melting point of 164°C, and a molecular weight of 80,000.
  • L-1 An oxidized polyethylene commercially avail ⁇ able under the trade designation as Allied 629A from Allied Corp.
  • the oxidized polyeth ⁇ ylene has a density (ASTM Test D-1505) of 0.93 grams per cubic centimeter ⁇ 20°C, a drop point of 104°C and a Brookfield Viscosity of 200 cps ⁇ 140°C.
  • L-2 A polyethylene wax commercially available from Allied Corp. under the trade designation Allied 617A.
  • the polyethylene wax has a density (ASTM Test D-1505) of 0.91 grams per cubic centimeter, a drop point of 102°C and a Brookfield Viscosity of 180 cps @ 140°C.
  • the pellets are placed in a high speed blender which is commercially available under the trade desig ⁇ nation Welex Model 35 from F. H. Papenmeier K.G. Com- pany.
  • the mixer has a diameter of 35 cm, and a nominal capacity of 1 cubic foot.
  • the baffle of the mixer is adjusted in the radial direction, the impeller is started and the tip speed is adjusted to about 2700 feet per minute (fpm).
  • various processing aids coded in Table I, are charged in the mixer in quantities set forth in Table II.
  • the pellets and processing aids are blended for a period of about eight minutes and discharged.
  • the discharged material is cooled to about 65°C, by circulating 20°C air.
  • Extrudability is determined by measuring the fusion time of the pellet as it is melt processed.
  • the pellets are placed in the bowl of a Brabender ® torque rheometer.
  • the bowl is maintained at a temperature of 170°C and the speed of the blades is about 60 rpm.
  • a sample of coated pellets, weighing 80 grams is charged in the rheometer, and the fusion times are determined.
  • the fusion time for the pellets is 60 sec ⁇ onds, and the maximum torque is 960 meters/gram.
  • a relatively short fusion time will cause degradation and discoloration of the molten polymer, resulting from a prolonged exposure to heat while in the molten state.
  • the maximum torque value a measure of the mechanical energy necessary to cause fusion, should be from about 1800 to about 2500 meter grams. Higher torque values will result in an excessively high current demand and possibly damage to the extruder motor.
  • Coating (a) processing aid and (b) amount of processing aid coating on pellet in weight percent.
  • Fusion Torque in sec. "NF" means that no fusion occurs by the time the test is terminated after 600 seconds.
  • the pellets are made of a polymeric composition comprising a 96.5 percent base resin, 1.5 percent ethylene vinyl acetate, 1.2 percent tetrasodium pyrophosphate and 0.8 percent epoxidized soybean oil.
  • the base resin is polymerized from a monomer mixture containing 94 weight percent vinylidene chloride and 6 weight percent methyl acrylate, said resin having a major melting point of 164°C, and a molecular weight of 90,000.
  • the pellets exhibited a relatively long fusion time and low fusion torque.
  • Example 5 The procedures of Example 5, respectively, are repeated with the following exception: Instead of the vinylidene chloride-vinyl chloride copolymer, the pel- lets are made of a polyvinyl chloride copolymer.
  • the pellets exhibited a relatively long fusion time and low fusion torque.
  • Example 5 The procedures of Example 5 are repeated with the following exception: instead of the vinylidene chloride-vinyl chloride copolymer, the pellets are made of polyethylene terephthalate copolymer.
  • Example 5 The procedures of Example 5 are repeated with the following exceptions: instead of the vinylidene chloride-vinyl chloride copolymer, the pellets are made of polypropylene.
  • the pellets exhibited a relatively long fusion time and low fusion torque.
  • Example 5 The procedures of Example 5 are repeated with the following exceptions: instead of the vinylidene chloride-vinyl chloride copolymer, the pellets are made of a polystyrene.
  • the pellets exhibited a relatively long fusion time and low fusion torque.
  • Example 5 The procedures of Example 5 are repeated with the following exceptions: instead of the vinylidene chloride-vinyl chloride copolymer, the pellets are made of a high impact polystyrene.
  • Example 5 The procedures of Example 5 are repeated with the following exception: instead of the vinylidene chloride-vinyl chloride copolymer, the pellets are made of polycarbonate.
  • the pellets exhibited a relatively long fusion time and low fusion torque.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

L'invention concerne des pastilles de plastique présentant un comportement amélioré lors de l'extrusion, dont la production consiste à enrober les pastilles d'une couche fusionnée de certaines cires de matières polymères, ainsi qu'un procédé de préparation consistant à chauffer les pastilles de plastique à une température juste en dessous de la température de ramollissement ou de fusion de l'additif tout en mélangeant la pastille dans un mélangeur de haute intensité, à introduire ledit additif et à maintenir un mélange intense jusqu'à ce que la température soit supérieure à la température de fusion dudit additif, puis à décharger les pastilles enrobées du mélangeur.
PCT/US1989/004575 1988-10-19 1989-10-13 Pastilles de plastique enrobees d'un auxiliaire de traitement et procede d'enrobage WO1990004463A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019900701291A KR900701406A (ko) 1988-10-19 1989-10-13 가공 보조제로 피복된 플라스틱 펠릿 및 이의 제조방법

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US25993788A 1988-10-19 1988-10-19
US259,937 1988-10-19

Publications (1)

Publication Number Publication Date
WO1990004463A1 true WO1990004463A1 (fr) 1990-05-03

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PCT/US1989/004575 WO1990004463A1 (fr) 1988-10-19 1989-10-13 Pastilles de plastique enrobees d'un auxiliaire de traitement et procede d'enrobage

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EP (1) EP0439491A4 (fr)
JP (1) JPH04501089A (fr)
KR (1) KR900701406A (fr)
AU (1) AU4415189A (fr)
CA (1) CA2000914A1 (fr)
WO (1) WO1990004463A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0659442A1 (fr) * 1993-12-07 1995-06-28 REHAU AG + Co Procédé pour la préparation d'articles médicaux
EP0703836A4 (fr) * 1992-09-01 1995-09-12 Du Pont Pastilles de resines thermoplastiques contenant un lubrifiant, leur procede de preparation et leur utilisation
EP0889074A1 (fr) * 1997-06-30 1999-01-07 Basf Corporation Procédé amélioré pour la fabrication de matières thermoplastiques personnalisées
EP0889075A1 (fr) * 1997-06-30 1999-01-07 Basf Corporation Procédé amélioré pour la fabrication de matières thermoplastiques personnalisées
EP0889076A1 (fr) * 1997-06-30 1999-01-07 Basf Corporation Procédé amélioré pour la fabrication de matières thermoplastiques personnalisées
EP0889073A1 (fr) * 1997-06-30 1999-01-07 Basf Corporation Procédé amélioré pour la fabrication de matières thermoplastiques personnalisées
EP0889072A1 (fr) * 1997-06-30 1999-01-07 Basf Corporation Procédé amélioré pour la fabrication de matières thermoplastiques personnalisées

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4527818B2 (ja) * 1999-03-16 2010-08-18 日本合成化学工業株式会社 エチレン−酢酸ビニル共重合体ケン化物ペレット
JP5272354B2 (ja) * 2007-08-30 2013-08-28 住友化学株式会社 メタクリル樹脂成形材料の製造方法
WO2023106330A1 (fr) * 2021-12-08 2023-06-15 三菱ケミカル株式会社 Matériau de moulage de résine méthacrylique, article moulé en résine, élément de véhicule, élément d'équipement de logement, élément optique, élément médical, récipient, et procédé de fabrication d'un article moulé en résine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2839422A (en) * 1956-02-17 1958-06-17 Dow Chemical Co Method for lubricating polystyrene granules and enhanced molding granules thereby obtained
US3687717A (en) * 1968-07-26 1972-08-29 Pfizer Method of coating particles by rotating a fluidized bed of the particles
US4238570A (en) * 1977-02-04 1980-12-09 Hitachi Chemical Company, Ltd. Novel expandable particles of a styrene polymer and process for preparing the same
US4483886A (en) * 1982-05-27 1984-11-20 Exxon Research & Engineering Co. Method for making free-flowing, melt-coated rubber pellets

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7605062A (nl) * 1975-05-15 1976-11-17 Bayer Ag Werkwijze voor de bereiding van een van toeslag- stoffen voorzien kunststofgranulaat.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2839422A (en) * 1956-02-17 1958-06-17 Dow Chemical Co Method for lubricating polystyrene granules and enhanced molding granules thereby obtained
US3687717A (en) * 1968-07-26 1972-08-29 Pfizer Method of coating particles by rotating a fluidized bed of the particles
US4238570A (en) * 1977-02-04 1980-12-09 Hitachi Chemical Company, Ltd. Novel expandable particles of a styrene polymer and process for preparing the same
US4483886A (en) * 1982-05-27 1984-11-20 Exxon Research & Engineering Co. Method for making free-flowing, melt-coated rubber pellets

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0439491A4 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0703836A4 (fr) * 1992-09-01 1995-09-12 Du Pont Pastilles de resines thermoplastiques contenant un lubrifiant, leur procede de preparation et leur utilisation
EP0703836A1 (fr) * 1992-09-01 1996-04-03 E.I. Du Pont De Nemours And Company Procede de preparation de pastilles de resines thermoplastiques contenant un lubrifiant
EP0659442A1 (fr) * 1993-12-07 1995-06-28 REHAU AG + Co Procédé pour la préparation d'articles médicaux
EP0889074A1 (fr) * 1997-06-30 1999-01-07 Basf Corporation Procédé amélioré pour la fabrication de matières thermoplastiques personnalisées
EP0889075A1 (fr) * 1997-06-30 1999-01-07 Basf Corporation Procédé amélioré pour la fabrication de matières thermoplastiques personnalisées
EP0889076A1 (fr) * 1997-06-30 1999-01-07 Basf Corporation Procédé amélioré pour la fabrication de matières thermoplastiques personnalisées
EP0889073A1 (fr) * 1997-06-30 1999-01-07 Basf Corporation Procédé amélioré pour la fabrication de matières thermoplastiques personnalisées
EP0889072A1 (fr) * 1997-06-30 1999-01-07 Basf Corporation Procédé amélioré pour la fabrication de matières thermoplastiques personnalisées

Also Published As

Publication number Publication date
JPH04501089A (ja) 1992-02-27
AU4415189A (en) 1990-05-14
CA2000914A1 (fr) 1990-04-19
EP0439491A1 (fr) 1991-08-07
EP0439491A4 (en) 1991-11-27
KR900701406A (ko) 1990-12-03

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