EP1025150A1 - Composition de polymere fluorocarbone - Google Patents

Composition de polymere fluorocarbone

Info

Publication number
EP1025150A1
EP1025150A1 EP98955215A EP98955215A EP1025150A1 EP 1025150 A1 EP1025150 A1 EP 1025150A1 EP 98955215 A EP98955215 A EP 98955215A EP 98955215 A EP98955215 A EP 98955215A EP 1025150 A1 EP1025150 A1 EP 1025150A1
Authority
EP
European Patent Office
Prior art keywords
fluorocarbon
polymer
article
composition
additive
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Withdrawn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
EP98955215A
Other languages
German (de)
English (en)
Inventor
Benjamin F. Du Pont
Leonard Edward Raymond Kosinski
Michael William Duch
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of EP1025150A1 publication Critical patent/EP1025150A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59

Definitions

  • This invention relates to a polymer-fluorocarbon composition of matter comprising a polymer having a Shore A scale hardness in the range of from about 10 to about 90 and from 1% to 10% of a fluorocarbon additive and to a method for preparing said composition.
  • Fluorocarbon additives are used to improve the processability of polymers and/or enhance the performance of articles fabricated from such compositions.
  • U.S. Patent No. 5,061,759 relates to rubber compositions vulcanizable by means of peroxides and containing processing-coadjuvating additives which are perfluoropolyethers in amounts ranging from 0.5% to 1% of the rubber composition.
  • the additives improve processability in extrusion and give better detachability of a vulcanized article from a molding die without adversely affecting the vulcanizing system or the properties of the vulcanized article.
  • the only articles referred to are test pieces for use in evaluating physical properties.
  • Japanese Patent Application Pub. No. 60-104161 relates to an abrasion resistant molding material comprising "hard" thermosetting or thermoplastic resins and from 1% to 10% of a fluorinated oil uniformly adhered to, impregnated or dispersed in the molding material.
  • Suitable fluorinated oils include perfluoropolyethers (such as, hexafluoropropylene oxide oligomers), and perfluorocarbons (such as, tetrafluoroethylene oligomers).
  • the molding material is used to make improved wear resistant sliding components for electrical contact switches, electromagnetic switches and the like.
  • U.S. Patent No. 5,143,963 and U.S. Patent No. 5,286,773 relate to a composition of matter formed by melt blending a thermoplastic polymer and from 0.01%) to less than 1% of a fluorocarbon additive and to a method of forming the composition.
  • the fluorinated additive is a fluorocarbon oil, gum or grease including fluorinated hydrocarbons and fluorinated hydrocarbon polyether oils.
  • the compositions are said to enhance and accelerate molding and extrusion operations for films and fibers.
  • the basic bulk mechanical, physical and chemical properties of the thermoplastic polymers are retained or even enhanced. Due to the concentration of the fluorocarbon additive at the surface of articles made from the composition the articles acquire fluorocarbon-like surface properties.
  • the composition is said to be useful for medical products e.g., vascular grafts, mammary or ocular implants, electronic equipment, electro-optical or electromechanical components and as molds for precision parts for such devices.
  • thermoplastic composition which comprises mixtures of vinyl chloride polymers and chlorinated polyethylene and which contain up to 0.4% of finely divided fluorocarbons, such as polytetrafluoroethylene, polytrifluoroethylene, polyvinyl fluoride, polyvinylidene fluoride and fluorinated polyethers e.g., perfluorovinylpolyether.
  • fluorocarbons such as polytetrafluoroethylene, polytrifluoroethylene, polyvinyl fluoride, polyvinylidene fluoride and fluorinated polyethers e.g., perfluorovinylpolyether.
  • U.S. Pat. No. 4,505,982 relates to a shaped article exhibiting good long term thermal stability, comprising a thermoplastic heat resistant polymer mixed with from 20% to 80% of at least one fluorocarbon.
  • the fluorocarbon can be polyvinylidene fluoride, polyvinyl fluoride or copolymers with tetrafluoroethylene, perfluorovinyl ethers and the like. Uses in films, fibers and threads are described.
  • An object of the present invention is to make available a novel composition of matter from which articles having improved performance and cost effectiveness can be fabricated.
  • thermoplastic or thermoset polymer or mixed polymers having a Shore A scale hardness in the range of from about 10 to about 90 and from 1% to 10%, of an additive consisting of a fluorocarbon or mixture of fluorocarbons, said additive having a lower surface energy than that of said polymer, can be used to fabricate an article having enhanced properties, the concentration of fluorocarbon being substantially higher at the surface of said article than the nominal bulk concentration.
  • Another aspect this invention relates to a method for making said composition of matter by mixing the components.
  • a further aspect relates to compounding and fabricating said composition into an article of a desired shape by an appropriate procedure such as molding or extrusion.
  • composition of this invention comprises a thermoplastic or thermoset polymer or mixed polymers having a Shore A scale hardness in the range of from about 10 to about 90 and an additive consisting of a fluorocarbon or mixture of fluorocarbons the proportion of the latter ranging from 1% to 10%) bulk concentration by weight of the amount of polymer, said fluorocarbon additive having a lower surface energy than that of said polymer.
  • Another aspect this invention relates to an article formed from said composition of matter, wherein the concentration of fluorocarbon is substantially higher at the surface of said article than the nominal bulk concentration.
  • this invention relates to a method for preparing said composition of matter and compounding and fabricating said composition into an article of a desired shape.
  • Typical articles prepared in accordance with this invention that have superior properties, such as squeak resistance and wear resistance, compared to those currently available.
  • squeak resistant it is meant that the articles tendency to generate sound (i.e., to squeak), when moved relative to a contacting surface; in its intended use, is reduced or preferably eliminated.
  • wear resistance it is meant that articles made in accordance with the invention have longer useful lives than articles made with the same polymer, but not containing the fluorocarbon additive.
  • the composition may be used in the manufacture of gaskets and blades.
  • gasket includes (1) articles inserted between two relatively hard surfaces to cushion their contact, and (2) articles that contact against a hard surface to form a seal, such as weather-stripping or lubricant seals; and the term “blade” includes articles that move across a hard surface to remove a substance, such as windshield wipers and squeegees.
  • Typical applications include weather-stripping, window lace, vehicle sealing system such as foamed door seals, windshield wipers, panel gaskets, spark plug and distributor boots, wear pads, bumpers suspensions, oriented bumpers, tail-light assemblies, engine mountings and gaskets, belts for vehicle engine and accessory systems, gears and bearings, window hardware components, conveyer line sections, gaskets for other purposes such as in fluid handling equipment, constructional engineering and architectural applications, luggage straps and buckles, footwear, particularly footwear for athletic purposes, parts for domestic and commercial appliances and the like.
  • vehicle sealing system such as foamed door seals, windshield wipers, panel gaskets, spark plug and distributor boots, wear pads, bumpers suspensions, oriented bumpers, tail-light assemblies, engine mountings and gaskets, belts for vehicle engine and accessory systems, gears and bearings, window hardware components, conveyer line sections, gaskets for other purposes such as in fluid handling equipment, constructional engineering and architectural applications, luggage straps and buckles, footwear, particularly footwear for athletic purposes, parts
  • Polymer Resins Thermoplastic or thermosetting polymer resins or mixtures of the two types of polymer resins, having a Shore A scale hardness in the range of from about 10 to about 90, as measured by ASTM method D-2240-91, are used in the compositions of this invention. Although there is some question about the reliability of Shore A scale hardness values measured in the range of from 90 to 100, polymers with such hardness values should be considered to be within the purview of this invention. Polymers falling within definition of this invention are often called "soft" polymers.
  • Thermoplastic polymer resins are those resins which are softened by heat, even in the finished product.
  • Thermosetting polymer resins are converted to infusible material during the fabrication process and thus the finished product is no longer susceptible to complete melting.
  • Polymer resins are used in the form of molding granules or powders which can contain other compounding additives and which are usually mixed along with fluorocarbon additives under precisely controlled conditions.
  • Thermoplastic polymer resins having a Shore A scale hardness in the range of from about 10 to about 90, which are used in a composition of this invention can include, but are not necessarily limited to: cellulosics such as cellulose acetate, cellulose acetate butyrate, cellulose acetate proprionate, fluoropolymers, polyamides, polybutylene, polyethylenes, chlorinated polyethylenes, ethylene acid copolymers, ethylene-ethyl acrylates, ethylene-methyl acrylates, ethylene-vinyl acetates, ethylene vinyl alcohol copolymers, ionomers, polymethylpentene, ethylene-propylene copolymers, polypropylene impact copolymers, polypropylene random copolymers, styrene-butadiene copolymers, styrene-ethylene/butylene-styrene, polyvinyl chloride, chlorinated polyvinyl chloride, vinylidene chlor
  • Thermosetting polymer resins having a Shore A scale hardness in the range of from about 10 to about 90, used in a composition of this invention can include, but are not necessarily limited to: polybutadiene, natural rubbers, silicones, silicone epoxy, polyesters, ethylene-propylene diene terpolymers (e.g., EPDM rubber), ionomers (e.g., Surlyn®), polyurethanes, segmented polyurea/urethanes, reaction injection molded (RIM) urethanes, styrene butadiene rubber, nitrile butadiene rubber.
  • polybutadiene natural rubbers
  • silicones silicone epoxy
  • polyesters ethylene-propylene diene terpolymers
  • ionomers e.g., Surlyn®
  • polyurethanes segmented polyurea/urethanes
  • reaction injection molded (RIM) urethanes styrene butadiene rubber
  • thermosetting resins are also meant to include thermoplastic resins which have been cross-linked to a high enough degree such that molten reprocessing is no longer possible without severe property losses.
  • Blends and alloys of two or more thermosetting polymers can also be used in the practice of this invention.
  • thermoplastic and thermosetting polymers such as EPDM rubber “alloys” with polypropylene (Santoprene®) and with PVC (Alcryn®) are also suitable for this invention.
  • the polymer resins used in the compositions and articles of this invention usually also contain one or more conventional resin compounding ingredients, such as, but not necessarily limited to: organic or inorganic fillers, reinforcing agents, colorants, thermal stabilizers, antioxidants, antiozonants, antistatic agents, antimicrobial agents, plasticizers, lubricants, antifogging agents, coupling agents, flame retardants, foaming agents, fragrances, heat stabilizers, impact modifiers, mold release agents, titanates, ultraviolet stabilizers, thermally conductive fillers, electrically conductive fillers, curing agents, cross-linking agents, catalysts, and the like.
  • plasticizers and impact modifiers which have the effect of reducing the base polymer hardness to a Shore A scale hardness range of from about 10 to about 90.
  • Suitable fluorocarbon additives are oils, gums or greases comprising fluorinated hydrocarbons or fluorinated hydrocarbonpolyethers having six or more carbon atoms, including linear, branched and cyclic compounds.
  • suitable compositions are perfluoroalkylpolyethers, (e.g., Krytox®, Fomblin®, Demnum® and Aflunox®), perfluoropolyethylene oxide, perfluoropolypropylene oxide, polytetrafluoroethylene ( e.g., Teflon®) perfluoropolyethylene- polypropylene, perfluoropolybutadiene, polyvinylidene fluoride, perfluorocarbons and fluorohydrocarbons including ethers containing functional group(s) such as but not limited to alcohols, amines, amides, esters, nitriles, thiols, acids, acid halides, including chlorine, bromine and iodine.
  • Higher molecular weight homologous linear and branched fluorohydrocarbons and fluorinated cyclic hydrocarbons may also be used, as well as partially fluorinated additives, such as those more than 50% fluorinated, preferably more than 75% fluorinated.
  • partially fluorinated additives such as those more than 50% fluorinated, preferably more than 75% fluorinated.
  • polychlorotrifluoroethylenes, polytetrafluoroexetanes, or other highly fluorinated compounds may be selected..
  • Fluorocarbon or mixed fluorocarbon additives which are compounded with the polymer resins preferably have a surface energy substantially lower than that of the polymers. Generally it is preferred that a fluorocarbon have a surface energy at least 5 dynes/cm lower than the surface energy of the polymer with which it is compounded.
  • the amount of fluorocarbon compounded with a suitable polymer resin is from 1% to 10% bulk concentration by weight of the amount of polymer. In an article formed from a composition of the invention the beneficial effects of the fluorocarbon additive are markedly evident toward the lower end of the range, due to the concentration at the surface being much higher than the nominal bulk concentration. At bulk loading levels of 1% and 10% the concentration of fluorocarbon in a surface layer lOnm thick is respectively above about 80% and up to about 99%.
  • the optimum amount of fluorocarbon additive will vary with the selected polymer, processing conditions, and intended use, and is readily determined by routine experimentation. The amount selected will generally be below the maximum level that can be retained by that particular polymer to avoid housekeeping problems that would be created by higher levels of addition not assimilated into the polymer.
  • the relationship between the surface concentration and the nominal bulk loading of fluorocarbon additives in a polymer can be ascertained by measuring the former using the ESCA analytical procedure on a test specimen, "poker chip", comprising a polymer compounded with perfluoroalkyl-polyether oil, (Krytox®).
  • This procedure which quantitatively analyses the atomic concentration of elements in a surface layer about 5 to 10 nanometers (nra) thick, is calibrated by applying a film of Krytox® oil to a glass slide and determining the level of fluorine in the film. This amount of fluorine, about 65% corresponded to 100%) coverage, with Krytox® oil.
  • the level of Krytox® oil in the surface layer is ascertained.
  • concentration in a surface layer 10 nm thick is found to be 88%.
  • the level of Krytox® is clearly much higher in the surface layer than in the bulk of the sample and at a bulk loading of 10% the surface concentration approaches 99% and can be more.
  • the degree to which fluorocarbon surface enrichment occurs depends upon the particular polymer and fluorocarbon components of a composition and the procedures used to mix them and fabricate an article of this invention.
  • the fluorocarbon is completely or to a large degree immiscible with the polymer and other components. Sufficient mixing must be provided to disperse the fluorocarbon throughout the polymer- fluorocarbon composition.
  • the fluorocarbon wets the processing equipment surfaces because of its low surface tension.
  • Processing a polymer-fluorocarbon composition from the liquid state to a solid article includes an essentially non- turbulent (i.e., not well mixed) flow field and adequate quench time to allow the fluorocarbon enriched surface layer to develop. Antithetically, if the liquid state is in a highly turbulent (i.e., well mixed) flow field and instantaneously quenched to the solid state considerably less fluorocarbon surface enrichment occurs.
  • polymer-fluorocarbon compositions where the polymer is a thermoplastic involve melting the thermoplastic polymer in order to mix with the fluorocarbon as a liquid.
  • the molten thermoplastic polymer-fluorocarbon composition is mixed to disperse the fluorocarbon throughout the thermoplastic polymer-fluorocarbon composition.
  • the molten thermoplastic polymer-fluorocarbon is then solidified by freezing, and when this constitutes the final article a low shear flow regime and adequate quench time is needed to allow fluorocarbon surface enrichment to occur.
  • thermoplastic polymer-fluorocarbon composition Some of the possible, yet not meant to be all inclusive, processing methods for incorporating fluorocarbon into a thermoplastic polymer-fluorocarbon composition are:
  • Liquid injection of the fluorocarbon into the molten mixing device is the preferred manner of adding the fluorocarbon to the polymer-fluorocarbon composition.
  • Some examples of molten mixing devices which can be used to mix a thermoplastic polymer-fluorocarbon composition are continuous mixers, extruders, kneaders and injection molding machines.
  • Thermosetting polymer-fluorocarbon compositions can be made via two different routes.
  • thermosetting polymer 1) Involves molten processing of additives and fluorocarbon with an already formed polymer with simultaneous or subsequent curing (i.e., cross-linking) to affect its thermoset character. 2) Involves contacting monomer, additives and fluorocarbon to form the thermosetting polymer directly.
  • thermosetting polymer-fluorocarbon In either case, it is unlikely that the fluorocarbon will interfere with polymerization or curing reactions. In the case where molten processing of the thermosetting polymer-fluorocarbon occurs, processing could be done as for the thermoplastic polymer-fluorocarbon compositions described above. In the case of a thermosetting polymer-fluorocarbon composition when the polymer is directly formed from reactants, the fluorocarbon will need to be well mixed in the reactants as they contact each other, and will form the enriched surface layer as the thermoset polymerization occurs.
  • An article can be formed from a novel composition of this invention by a number of conventional fabrication processes.
  • the fabrication process will usually be determined by cost effectiveness, for example the elimination of topical application, labor costs, and/or the need to fit existing process equipment.
  • the fabrication process used to make the polymer-fluorocarbon article will determine the nature of the polymer and fluorocarbon feedstocks to the process. If the fabrication process involves little or no mixing, e.g., compression molding, then a pre-compounded polymer-fluorocarbon composition would best serve as the feedstock. However, if the fabrication process employs a molten mixing device with sufficient mixing, the process feeds could be a post- compounded polymer-fluorocarbon composition, polymer with fluorocarbon liquid injection, or blends of polymer and a precompounded polymer-fluorocarbon composition.
  • the polymer-fluorocarbon article is comprised of a polymer foam, then the maximum outer surface enrichment by the fluorocarbon will be obtained if the fluorocarbon surface enrichment largely occurs prior to the foam expansion and freezing step. Conversely, if the foamed polymer-fluorocarbon composition is processed molten as an expanded foam the fluorocarbon, due to its low surface /23147 tension, would enrich the surfaces of the interior foam cells decreasing enrichment of the outer surface of the article.
  • polymer-fluorocarbon article fabrication processes include, but are not limited to: extrusion, injection molding, injection blow molding, extrusion blow molding, calendaring, pultrusion, reactive injection molding, and reactive extrusion.
  • fibers, rods, tubes, sheets, profiles, and intricately shaped parts such as, vehicle weather- stripping, window lace, windshield wiper blades, panel gaskets, spark plug and distributor boots, sealing joints between flanges, such as gaskets for engines,
  • articles such as those described above are subjected over extended periods to vibration, sudden change in direction of movement, sliding surfaces in contact and similar conditions which result in the production of undesirable noises e.g., squeaks, and excessive wear.
  • Articles made using the compositions and procedures of this invention show improved performance in these respects over prolonged periods of use.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

La présente invention concerne des polymères possédant une dureté Shore de 10 à 90 modifiés par un additif fluorocarboné de manière à leur conférer une résistance à l'usure.
EP98955215A 1997-10-31 1998-10-30 Composition de polymere fluorocarbone Withdrawn EP1025150A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US6396197P 1997-10-31 1997-10-31
US63961P 1997-10-31
PCT/US1998/023113 WO1999023147A1 (fr) 1997-10-31 1998-10-30 Composition de polymere fluorocarbone

Publications (1)

Publication Number Publication Date
EP1025150A1 true EP1025150A1 (fr) 2000-08-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP98955215A Withdrawn EP1025150A1 (fr) 1997-10-31 1998-10-30 Composition de polymere fluorocarbone

Country Status (3)

Country Link
EP (1) EP1025150A1 (fr)
JP (1) JP2001521961A (fr)
WO (1) WO1999023147A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20010554A1 (it) 2001-03-16 2002-09-16 Ausimont Spa Additivi per resine idrogenate

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3248731A1 (de) * 1982-12-31 1984-07-05 Hoechst Ag, 6230 Frankfurt Thermoplastische masse
JPS60104161A (ja) * 1983-11-10 1985-06-08 Fuji Electric Co Ltd 耐摩耗性成形材料
US5143963A (en) * 1989-12-06 1992-09-01 Res Development Corp. Thermoplastic polymers with dispersed fluorocarbon additives

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9923147A1 *

Also Published As

Publication number Publication date
JP2001521961A (ja) 2001-11-13
WO1999023147A1 (fr) 1999-05-14

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