EP0703947A4 - Composition a base de resine de polyacetal - Google Patents

Composition a base de resine de polyacetal

Info

Publication number
EP0703947A4
EP0703947A4 EP94921961A EP94921961A EP0703947A4 EP 0703947 A4 EP0703947 A4 EP 0703947A4 EP 94921961 A EP94921961 A EP 94921961A EP 94921961 A EP94921961 A EP 94921961A EP 0703947 A4 EP0703947 A4 EP 0703947A4
Authority
EP
European Patent Office
Prior art keywords
polyacetal
polyacetal resin
resin composition
weight
density
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Withdrawn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
EP94921961A
Other languages
German (de)
English (en)
Other versions
EP0703947A1 (fr
Inventor
Kenichi Shinohara
Tatsuhiro Takahashi
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
Priority claimed from JP14332293A external-priority patent/JPH073118A/ja
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of EP0703947A1 publication Critical patent/EP0703947A1/fr
Publication of EP0703947A4 publication Critical patent/EP0703947A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L59/00—Compositions of polyacetals; Compositions of derivatives of polyacetals
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L55/00—Compositions of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08L23/00 - C08L53/00
    • C08L55/02—ABS [Acrylonitrile-Butadiene-Styrene] polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds

Definitions

  • the present invention relates to a polyacetal resin composition, the principle component of which is a polyacetal resin, and to a resin composition that has excellent friction-wear characteristics suitable for use in sliding parts. It further specifically relates to a polyacetal resin composition that provides good friction-wear resistance when used as a sliding part against a counter sliding part regardless of its material of construction.
  • Polyacetal resins which are thermoplastic, exhibit excellent mechanical properties and heat resistance, particularly good friction-wear resistance characteristics and are, thus, used in sliding parts applications in a broad range of fields.
  • inorganic solid lubricants such as molybdenum disulfide and graphite, petroleum-type lubricants, synthetic lubricants, aliphatic alcohol or its ester-type liquid or semi-liquid lubricants, or a polyolefin resin fine powder having a molecular weight of at least 500,000.
  • the present invention relates to a polyacetal resin composition
  • a polyacetal resin composition comprising not more than 15% by weight of a polyolefin resin, preferably at least 0.5% by weight up to 15% by weight, that has a density of not more than 0.93 g/cm 3 and a weight average molecular weight of less than 500,000.
  • polyacetal resin is meant not only a polyacetal homopolymer, but also a polyacetal copolymer with a cyclic either or a cyclic polymer. It is, however, preferred to use a polyacetal homopolymer because the addition of a lubricant to a copolymer sometimes will reduce its physical properties (tensile characteristics, Izod impact characteristics, flexural characteristics, compression properties, and the like).
  • polyolefin resin refers to aliphatic-alpha-olefin homopolymers, such as polyethylene, polypropylene, and polymethyl pentene, or copolymers of aliphatic-alpha-olefins themselves. Such copolymers may contain a small amount of a diene-type hydrocarbon comonomer.
  • the polyolefin resin used in this invention must have a density of not higher than 0.93 g/cm 3 and a weight average molecular weight of not higher than 500,000. Polyolefins having such densities and molecular weights disperse in the polyacetal in fine particles of not more than 10 microns in size.
  • Preferred polyolefin resins which are commercially readily available are polyethylene and polypropylene, most preferably polyethylene.
  • the polyacetal resin composition of this invention is obtained by mixing at least 85% by weight of a polyacetal resin and up to 15%, inclusive, by weight of a polyolefin resin in a conventional mixer.
  • the polyolefin resin should be used normally in an amount of at least 0.5% by weight, preferably in a range of 0.5-10% by weight. The use of more than 15% by weight will reduce the excellent physical properties inherent in the polyacetal resin and also will deteriorate its processability.
  • the polyacetal resin composition of this invention can be used with no differences in the areas in which the polyacetal resins have been previously used. Use of this composition with a sliding part material is particularly preferred because it exhibits high frictional wear resistance, regardless of the material of the counter sliding part material that it comes in contact therewith.
  • the polyacetal resin composition of this invention may be further compounded with various additives that are used in polyacetal resins, such as a stabilizer, a nucleating agent, an antistatic agent, a flame retardant, a colorant, a lubricant, or the like, as well as with fibrous or granular fillers or reinforcing agents.
  • additives such as a stabilizer, a nucleating agent, an antistatic agent, a flame retardant, a colorant, a lubricant, or the like, as well as with fibrous or granular fillers or reinforcing agents.
  • HDPE High-density polyethylene, HD 6733.19 (a product of the Exxon Company)
  • EVA Ethylene-vinyl acetate copolymer
  • ELVAX 40 a * • ⁇ • ⁇ ⁇ product of E. I. du Pont de Nemours and Company
  • PE-g-As Polyethylene-styrene/acrylonitrile grafted copolymer, Modiper 1400 (a product of Nippon Yushi)
  • Test 1 Density: 0.97 g/cm 3
  • the specimens of Test 1 each contained 2.0% of a resin additive comprising a polyolefin and other resin.
  • ABS ABS Resin
  • Cycolac 5500 a product of the GE
  • PET 20% glass fiber reinforced polyethylene terephthalate, Rynite ® 530 (a product of E. I. du Pont de Nemours and Company).
  • a polyacetal resin composition sheet (Sample 1) is placed on a tabletop capable of making a horizontal reciprocal movement with an amplitude of 2.75 inches; on the polyacetal resin sheet top surface is placed a 1/4 inch wide by 1 inch long sliding counter material-made from a resin sheet (Sample 2), fixed so as not to make any horizontal movement, and a 40 psi load is applied to Sample 2.
  • the tabletop was allowed to make a typical reciprocal movement at an average rate of 30 feet/min for 3 hours.
  • the weight loss of each resin sheet before and after the above test was measured and wear characteristics was calculated by the following equation: Equation 1
  • V rate (ft/min)
  • Test Nos. 1-4 are Examples of this invention and Test Nos. 5-6 are Comparative
  • the polyacetal resin composition of this invention constantly gives excellent friction-wear resistance characteristics regardless of the sliding conditions, such as load and speed, or regardless of the material of the counter surface.
  • the polyacetal resin composition of this invention can exhibit excellent sliding characteristics of friction-wear resistance with low coefficients of friction regardless of the sliding part counter part material even when the sliding surfaces have elevated temperatures, generated by the heat of friction.

Landscapes

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

Abstract

Composition à base de résine de polyacétal possédant d'excellentes caractéristiques de résistance à l'usure par frottement. Cette composition contient jusqu'à 15 % en poids d'un résine de polyoléfine possédant une densité ne dépassant pas 0,93 g/cm3 et une masse moléculaire moyenne inférieure à 500 000.
EP94921961A 1993-06-15 1994-06-15 Composition a base de resine de polyacetal Withdrawn EP0703947A4 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP14332293A JPH073118A (ja) 1993-06-15 1993-06-15 ポリアセタール樹脂組成物
JP143322/93 1993-06-15
US25940794A 1994-06-14 1994-06-14
US259407 1994-06-14
PCT/US1994/006760 WO1995000585A2 (fr) 1993-06-15 1994-06-15 Composition a base de resine de polyacetal

Publications (2)

Publication Number Publication Date
EP0703947A1 EP0703947A1 (fr) 1996-04-03
EP0703947A4 true EP0703947A4 (fr) 1996-06-05

Family

ID=26475090

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94921961A Withdrawn EP0703947A4 (fr) 1993-06-15 1994-06-15 Composition a base de resine de polyacetal

Country Status (4)

Country Link
EP (1) EP0703947A4 (fr)
KR (1) KR960703154A (fr)
CA (1) CA2164934A1 (fr)
WO (1) WO1995000585A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3102890B2 (ja) * 1994-10-24 2000-10-23 旭化成工業株式会社 ポリオキシメチレン樹脂組成物
US6221946B1 (en) * 1996-04-23 2001-04-24 Asahi Kasei Kogyo Kabushiki Kaisha Polyoxymethylene resin composition
KR101380533B1 (ko) 2006-06-15 2014-04-01 미쓰비시 엔지니어링-플라스틱스 코포레이션 폴리아세탈 수지 조성물과 그 제조 방법, 및 그 수지 조성물을 성형하여 이루어지는 슬라이딩 부재

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4391741A (en) * 1977-03-10 1983-07-05 Asahi Kasei Kogyo Kabushiki Kaisha Polyoxymethylene composition
US4556690A (en) * 1983-05-10 1985-12-03 Mitsui Petrochemical Industries, Ltd Acetal resin composition
EP0292746A2 (fr) * 1987-05-15 1988-11-30 Mitsubishi Petrochemical Co., Ltd. Composition de résines de polyacétal et éléments de friction fabriqués avec ces compositions
EP0430215A2 (fr) * 1989-11-28 1991-06-05 Asahi Kasei Kogyo Kabushiki Kaisha Composition de résine de polyoxyméthylène résistant à l'usure et procédé de préparation
WO1992007033A1 (fr) * 1990-10-22 1992-04-30 E.I. Du Pont De Nemours And Company Compositions a base de polyoxymethylene contenant du polyethylene lineaire de faible densite

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4391741A (en) * 1977-03-10 1983-07-05 Asahi Kasei Kogyo Kabushiki Kaisha Polyoxymethylene composition
US4556690A (en) * 1983-05-10 1985-12-03 Mitsui Petrochemical Industries, Ltd Acetal resin composition
EP0292746A2 (fr) * 1987-05-15 1988-11-30 Mitsubishi Petrochemical Co., Ltd. Composition de résines de polyacétal et éléments de friction fabriqués avec ces compositions
EP0430215A2 (fr) * 1989-11-28 1991-06-05 Asahi Kasei Kogyo Kabushiki Kaisha Composition de résine de polyoxyméthylène résistant à l'usure et procédé de préparation
WO1992007033A1 (fr) * 1990-10-22 1992-04-30 E.I. Du Pont De Nemours And Company Compositions a base de polyoxymethylene contenant du polyethylene lineaire de faible densite

Also Published As

Publication number Publication date
KR960703154A (ko) 1996-06-19
WO1995000585A2 (fr) 1995-01-05
CA2164934A1 (fr) 1995-01-05
EP0703947A1 (fr) 1996-04-03

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