GB763939A - Improvements in or relating to shaped polyamide articles and method of forming same - Google Patents

Improvements in or relating to shaped polyamide articles and method of forming same

Info

Publication number
GB763939A
GB763939A GB6273/52A GB627352A GB763939A GB 763939 A GB763939 A GB 763939A GB 6273/52 A GB6273/52 A GB 6273/52A GB 627352 A GB627352 A GB 627352A GB 763939 A GB763939 A GB 763939A
Authority
GB
United Kingdom
Prior art keywords
nylon
powder
sintering
graphite
filler
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.)
Expired
Application number
GB6273/52A
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.)
Polymer Corp
Original Assignee
Polymer Corp
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 Polymer Corp filed Critical Polymer Corp
Publication of GB763939A publication Critical patent/GB763939A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C08J11/00—Recovery or working-up of waste materials
    • C08J11/04—Recovery or working-up of waste materials of polymers
    • C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
    • C08J11/08—Recovery or working-up of waste materials of polymers without chemical reactions using selective solvents for polymer components
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
    • A62C3/07—Fire prevention, containment or extinguishing specially adapted for particular objects or places in vehicles, e.g. in road vehicles
    • A62C3/08—Fire prevention, containment or extinguishing specially adapted for particular objects or places in vehicles, e.g. in road vehicles in aircraft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/006—Pressing and sintering powders, granules or fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/02—Moulding by agglomerating
    • B29C67/04—Sintering
    • 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
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/08—Heat treatment
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/20—Sliding surface consisting mainly of plastics
    • F16C33/201—Composition of the plastic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/20—Sliding surface consisting mainly of plastics
    • F16C33/208—Methods of manufacture, e.g. shaping, applying coatings
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/002—Inhomogeneous material in general
    • H01B3/004—Inhomogeneous material in general with conductive additives or conductive layers
    • 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
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/16—Fillers
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/251—Particles, powder or granules
    • 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
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • 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
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • B29K2705/08—Transition metals
    • B29K2705/10—Copper
    • 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
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • B29K2705/08—Transition metals
    • B29K2705/12—Iron
    • 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
    • B29K2709/00—Use of inorganic materials not provided for in groups B29K2703/00 - B29K2707/00, for preformed parts, e.g. for inserts
    • 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
    • C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
    • 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
    • C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
    • C08J2377/06—Polyamides derived from polyamines and polycarboxylic acids
    • C08J2377/08—Polyamides derived from polyamines and polycarboxylic acids from polyamines and polymerised unsaturated fatty acids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F16C2208/60—Polyamides [PA]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Medicinal Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • Public Health (AREA)
  • Thermal Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

Articles are formed from particles of polyamides or polyesteramides by sintering under substantially non-oxidizing conditions at a temperature below that at which any substantial amount of molten phase is produced. The particles have an average diameter of less than 40 microns and are formed under substantially non-oxidizing conditions by precipitation by cooling a solution in a liquid which is a solvent for the polyamide at elevated temperature and a non-solvent at room temperature followed by washing and drying. A suitable liquid is ethylene glycol or aqueous ethanol. The powder may also be produced by hammering nylon which has been embrittled with liquid nitrogen. To make articles it is compressed, e.g. at 10-50 tons per square inch, with or without a filler, and the article is then heated to sinter the particles without fusion. Pressing preferably takes place at room temperature. The product may be annealed. The filler may constitute 85 per cent by volume of the total mixture. Suitable fillers which are preferably finely-divided, are diamond dust, silica, carborundum, chalk, alumdum, tungsten carbide, copper, lead, iron, iron oxide, carbon, graphite, molybdenum disulphide, titanium dioxide, various titanates, nylon, of higher melting-point or polytetrafluoroethylene. To achieve surface porosity a soluble material may be mixed with the nylon powder and leached from the finished product. It is found that the strength of the finished product increases sharply when the sintering temperature is raised above a certain point (easily ascertained for any polyamide) and sintering should be conducted at a temperature above this but below the melting-point. Sintering may take place in vacuo or in hot oil. Preferably the moisture content of the article to be sintered should be low and either the article or the powder may be vacuum dried. The nylon may be waste, virgin or a mixture. Examples describe the manufacture of bars or bushings from waste or virgin nylon by the method of the invention and describe physical tests on the products. In some cases the nylon powder was mixed with graphite or copper powder. Lubricants, e.g. zinc stearate, or hydrogenated cottonseed oil may be mixed with the nylon powder or coated on the die surfaces to improve uniformity of the shaped pieces and facilitate their removal from the mould. The process is particularly useful for bushings and may also be employed for making thread guides, cams, gears, thrust washers or materials responsive to magnetic or electrical forces or with abrasive properties. Using a pigment or graphite as the filler, crayons or pencil leads of great strength may be produced. Specifications 461,236, 461,237, [Group IV], and 763,940 are referred to.ALSO:Articles are formed from particles of polyamides or polyesteramides by sintering under substantially non-oxidising conditions at a temperature below that at which any substantial amount of molten phase is produced. The particles have an average diameter of less than 40 microns and are formed under substantially non-oxidising conditions by hammering nylon which has been embrittled with liquid nitrogen or, preferably, by precipitation by cooling a solution in a liquid which is a solvent for the polyamide at elevated temperature and a non-solvent at room temperature. A suitable liquid is ethylene glycol or aqueous ethanol. The powder, after washing and drying, is compressed e.g. at 10-50 tons per square inch with or without a filler to produce an article which can be handled and which is then heated to sinter the particles without fusion. Pressing preferably takes place at room temperature. The product may be annealed. The filler may constitute 85 per cent by volume of the total mixture. Suitable fillers which are preferably finely divided are diamond dust, silica, carborundum, chalk, alundum, tungsten carbide, copper, lead, iron, iron oxide, carbon, graphite, molybdenum disulphide, titanium dioxide, various titanates, nylon or polytetrafluoroethylene. To achieve surface porosity a soluble material may be mixed with the nylon powder and leached from the finished product. It is found that the strength of the finished product increases sharply when the sintering temperature is raised above a certain point (easily ascertained for any polyamide) and sintering should be conducted at a temperature above this but below the melting point. Sintering may take place in vacuo or in hot oil. Preferably the moisture content of the article to be sintered should be low and either the article or the powder may be vacuum dried. The nylon may be waste, virgin or a mixture. Examples describe the manufacture of bars or bushings from waste or virgin nylon by the method of the invention and describe physical tests on the products. In some cases the nylon powder is mixed with graphite or copper powder. Lubricants e.g. zinc stearate, or hydrogenated cotton seed oil may be mixed with the nylon powder or coated on the die surfaces to improve uniformity of the shaped pieces and facilitate their removal from the mould. The process is particularly useful for bushings and may also be employed for making thread guides, cams, gears, thrust washers or materials responsive to magnetic or electrical forces or with abrasive properties. Using a pigment or graphite as the filler, crayons or pencil leads of great strength may be produced.
GB6273/52A 1951-03-21 1952-03-11 Improvements in or relating to shaped polyamide articles and method of forming same Expired GB763939A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US318828XA 1951-03-21 1951-03-21
US190551XA 1951-05-19 1951-05-19

Publications (1)

Publication Number Publication Date
GB763939A true GB763939A (en) 1956-12-19

Family

ID=27361142

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6273/52A Expired GB763939A (en) 1951-03-21 1952-03-11 Improvements in or relating to shaped polyamide articles and method of forming same

Country Status (5)

Country Link
CH (2) CH318828A (en)
DE (1) DE1026068B (en)
FR (1) FR1061794A (en)
GB (1) GB763939A (en)
NL (1) NL91119C (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1085282B (en) * 1959-05-22 1960-07-14 Bobinet Ind A G Deutsche Lubricants for textile machines
DE1150484B (en) * 1960-09-15 1963-06-20 Degussa Additive to lubricants
WO2005000555A2 (en) * 2003-06-27 2005-01-06 Rhodia Engineering Plastics S.R.L. Method of producing articles by means of rotational moulding
CN110395027A (en) * 2019-07-23 2019-11-01 福建百宏高新材料实业有限公司 A kind of highlighted polyester film and its manufacturing method
CN114875664A (en) * 2022-05-24 2022-08-09 上海氯碱化工股份有限公司 Hydrophobic modification method of nylon and polyvinyl chloride composition containing modified nylon

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1278100B (en) * 1961-09-26 1968-09-19 Sueddeutsche Kabelwerke Zweign Process for the treatment of waste made from thermoplastics containing impurities

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE714708C (en) * 1938-11-01 1941-12-05 Ig Farbenindustrie Ag Process for the production of molded parts from super polyamides by injection molding
CH216211A (en) * 1938-11-12 1941-08-15 Dynamit Nobel Ag Process for the shaping processing of reversibly processable plastics.

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1085282B (en) * 1959-05-22 1960-07-14 Bobinet Ind A G Deutsche Lubricants for textile machines
DE1150484B (en) * 1960-09-15 1963-06-20 Degussa Additive to lubricants
WO2005000555A2 (en) * 2003-06-27 2005-01-06 Rhodia Engineering Plastics S.R.L. Method of producing articles by means of rotational moulding
WO2005000555A3 (en) * 2003-06-27 2005-03-10 Rhodia Eng Plastics Srl Method of producing articles by means of rotational moulding
CN110395027A (en) * 2019-07-23 2019-11-01 福建百宏高新材料实业有限公司 A kind of highlighted polyester film and its manufacturing method
CN114875664A (en) * 2022-05-24 2022-08-09 上海氯碱化工股份有限公司 Hydrophobic modification method of nylon and polyvinyl chloride composition containing modified nylon

Also Published As

Publication number Publication date
FR1061794A (en) 1954-04-15
NL91119C (en)
DE1026068B (en) 1958-03-13
CH342369A (en) 1959-11-15
CH318828A (en) 1957-01-31

Similar Documents

Publication Publication Date Title
US2695425A (en) Method of making sintered nylon articles and resultant product
US2401221A (en) Method of impregnating porous metal parts
EP0644808B1 (en) Metal powder compositions containing binding agents for elevated temperature compaction
DE69524236T2 (en) IRON-BASED POWDER COMPOSITIONS WITH GREEN-ENHANCING LUBRICANTS
US4144207A (en) Composition and process for injection molding ceramic materials
US2698966A (en) Process for producing shaped articles from mixtures of polyamides
CA1323178C (en) Method of debinding for injection molded objects
CN105174251A (en) Preparation method of isostatic pressing formed graphite of ultra-thin structure
DE60004613T2 (en) High density non-magnetic tungsten alloy
GB763939A (en) Improvements in or relating to shaped polyamide articles and method of forming same
US2849414A (en) Nylon-carbon black composition and article
US2175899A (en) Process for making metal articles
US2852485A (en) Shaped polyamide articles
US1642348A (en) Alloy structure
US2229330A (en) Porous metal product and method of making same
US3169862A (en) Process for making anodes for electrolytic condensers
US3052646A (en) Blend of finely divided polyamide and polyethylene glycol
US2849415A (en) Nylon composition and article
US3136735A (en) Addition of carbonamides to polyethylene to increase abrasion resistance
US3925323A (en) Poly(meta-phenylene isophthalamide)powder
US1556658A (en) Bearing material
US5746960A (en) Method of manufacturing powder injection molded part
US3965236A (en) Poly(meta-phenylene isophthalamide) powder and process
US2286672A (en) Hard metal article and method of making
EP0409646A2 (en) Compound for an injection molding