CA2164934A1 - Polyacetal resin composition - Google Patents
Polyacetal resin compositionInfo
- Publication number
- CA2164934A1 CA2164934A1 CA002164934A CA2164934A CA2164934A1 CA 2164934 A1 CA2164934 A1 CA 2164934A1 CA 002164934 A CA002164934 A CA 002164934A CA 2164934 A CA2164934 A CA 2164934A CA 2164934 A1 CA2164934 A1 CA 2164934A1
- Authority
- CA
- Canada
- Prior art keywords
- polyacetal
- polyacetal resin
- weight
- resin composition
- resin
- 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.)
- Abandoned
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
- 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
- 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
-
- 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
Abstract
The present invention aims to provide a polyacetal resin composition having excellent friction-wear resistance characteristics, said composition containing not more than 15 % by weight of a polyolefin resin that has a density of not more than 0.93 g/cm3 and a weight average molecular weight of less than 500,000.
Description
~O 95/00585 ~ 1 6 4 9 3 ~ PCl l S94/06760 .
TITLE
POLYACETAL RESIN COMPOSITION
DETAILED DESCR~PI ION OF THE INVENTION
The present invention relates to a polyacetal resin composition, 5 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 resisla.lce when used as a sliding part against a counter sliding part regardless of its material of 10 col~slluction.
Polyacetal resins, which are thermoplastic, exhibit excellent mechanical properties and heat rec;~t~.~ce, particularly good friction-wear resi~t~nce characteristics and are, thus, used in sliding parts applic~tio~ in abroad range of fields.
In order to further hllpfo~e upon the friction-wear characteristics of polyacetal resins, methods are known for inco-poratillg inorganic solid lubricants, such as molybde-mlm 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 20 weight of at least 500,000. Huwe~cr, the incorporation of a lubricant in a polyacetal resin for the objective of i.npl ovillg its friction-wear characteristics has also been known to cause problems, such as a reduction in the physical properties inherent in the resin or the slippage of pellets on the screw surfaces or cylinder inner surfaces in a screw rev~ cycle where 25 the resin is processed by an injection molder or extruder, reslllting in a failure of the resin to be grabbed by the molding m~hine, with a reslllt~nt considerable decrease in productivity. Another problem is that there has been a subst~nti~l change in the friction-wear friction resi~t~nce, which is greatly dependent upon the m~teri~l of the counter sliding part that comes 30 in contact with the resin, with the results that good behavior is shown with a cergain counter part material, but poor wear behavior is exhibited toward another material.
Due to of the trend of the friction-wear characteristics to vary depending upon the type of material used for the part which comes in 35 contact with the polyacetal molded article, one has had to select a lubricant, taking into consideration the type of material used in the sliding part that 3 3 ll ~
TITLE
POLYACETAL RESIN COMPOSITION
DETAILED DESCR~PI ION OF THE INVENTION
The present invention relates to a polyacetal resin composition, 5 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 resisla.lce when used as a sliding part against a counter sliding part regardless of its material of 10 col~slluction.
Polyacetal resins, which are thermoplastic, exhibit excellent mechanical properties and heat rec;~t~.~ce, particularly good friction-wear resi~t~nce characteristics and are, thus, used in sliding parts applic~tio~ in abroad range of fields.
In order to further hllpfo~e upon the friction-wear characteristics of polyacetal resins, methods are known for inco-poratillg inorganic solid lubricants, such as molybde-mlm 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 20 weight of at least 500,000. Huwe~cr, the incorporation of a lubricant in a polyacetal resin for the objective of i.npl ovillg its friction-wear characteristics has also been known to cause problems, such as a reduction in the physical properties inherent in the resin or the slippage of pellets on the screw surfaces or cylinder inner surfaces in a screw rev~ cycle where 25 the resin is processed by an injection molder or extruder, reslllting in a failure of the resin to be grabbed by the molding m~hine, with a reslllt~nt considerable decrease in productivity. Another problem is that there has been a subst~nti~l change in the friction-wear friction resi~t~nce, which is greatly dependent upon the m~teri~l of the counter sliding part that comes 30 in contact with the resin, with the results that good behavior is shown with a cergain counter part material, but poor wear behavior is exhibited toward another material.
Due to of the trend of the friction-wear characteristics to vary depending upon the type of material used for the part which comes in 35 contact with the polyacetal molded article, one has had to select a lubricant, taking into consideration the type of material used in the sliding part that 3 3 ll ~
comes in contact ther~_~vilh, so as to achieve the desired friction wear-characteristics. There is, accoldi-lgly, a need for a po1yacetal resin with goodfriction-wear resistance regardless of the counter part material.
Extensive studies were carried out on a polyacetal resin 5 composition that provides a stable friction-wear characteristic regardless of the dirrerellce in the material of the sliding material which comes in contact therewith, even under high speed, high load sliding conditions, without losing the excellent polyacetal resin properties, which led to the finding that an effective method is to incol~ol~te not more than 15% by weight of a 10 polyolefin resin that has a density of not higher than 0.93 g/cm3 and a weight average molecular weight of not more than 500,000.
Thus, the present invention relates to a polyacetal resin composition coll~ isi-~g not more than l5~o by weight of a polyolefin resin, preferably at least O.S% by weight up to 15% by weight, that has a density of 15 not more than 0.93 g/cm3 and a weight average molecular weight of less than 500,000.
By the term "polyacetal resin'r, is meant not only a polyacetal homopolyrner, but also a polyacetal copolymer with a cyclic either or a cyclic polymer. It is, ho~.~ver, preferred to use a polyacetal homopolymer bccause 20 the addition of a lubricant to a copolymer sometimes will reduce its physicalproperties (tensile characteristics, Izod impact characteristics, flexural characteristics, colnpl e;,~ion properties, and the like).
The term polyolefin resin, as used in this invention, refers to aliphatic-alpha-olefin homopolymers, such as polyethylene, poly~o~ylene, 25 and polymethyl pentene, or copolymers of aliphatic-alpha-olefins themselves. Such copolyrners may contain a small ~mr~11nt of a diene-type hydrocarbon comonomer. The polyolefin resin used in this invention must have a density of not higher than 0.93 g/cm3 and a weight average mo1ec 11~r weight of not higher than 500,000. Polyolefins having such ~en~itieS and 30 molecular weights disperse in the polyacetal in fine particles of not more than 10 microns in size. Plefelled polyoleffn resins which are colnmercially readily available are polyethylene and poly~rol)ylene, most preferably polyethylene.
The polyacetal resin composition of this invention is obtained by 35 mixing at least 85% by weight of a polyacetal resin and up to 15%, inclusive,by weight of a polyolefin resin in a COll~ elllional mixer. The polyolefin resin 0 95/00585 2 1 6 ~ 9 3 L~ PCT/US94/06760 i should be used normally in an amount of at least O.5~o by weight, ~r~Çc~ably 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 processabili~r.
The polyacetal resin colllyosilion 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 bec~lse 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 nllcle~ting agent, an ~ntict~tic agent, a flame retardant, a colorant, a lubricant, or the like, as well as with fibrous or granular fillers or reh-rorcillg agents.
The out~t~nrling wear characteristics of the polyacetal resin composition of this invention are spe~ific~lly shown below. The following materials were used:
Polyacetal Res~n Col..vcsilio.. (Saml~le l) Polyacetal Resin A. Polyacetal Homopolymer, Delrin~ 900NC (a product of E. I.
du Pont de Nemours and Co.,.pa~
Resins Incorporated (F'~ ne Resins Pnd O~her Resins) HDPE = High-density polyethylene, HD 6733.19 (a product of the EDcon ~"'l'~"Y) Density: 0.95 g/cm3 r T T~PE = Linear low-density polyethylene, LL 6101.59 (a product of the Exxon ~o~ y) Density: 0.92g/cm3 LDPE = Low-density polyethylene, KN 230 (a product of the Chevron Chemical Con~a,y) Density: 0.92 g/cm3 EPDM = Ethylene propylene diene copolymer, Nordel 3681 (a product of E. I. du Pont de Nemours and Comp~ny) Density: 0.86 g/cm3 wo g~/00585 1 ~ 4 9 3 ~ PCT/US94/06760 EVA = Ethylene-vinyl acetate copolyrner, ELVAX 40 ( a product of E. I. du Pont de Nemours and .. Co~ a,ly) Density: 0.95 g/cm3 S PE-g-As = Polyethylene-styrene/acIylonitrile grafted copolymer, Modiper 1400 (a product of Nippon Yushi) Density: 0.97g/cm3 The specimen~ of Test 1 each contained 2.0~o of a resin additive 10 col~ l isil,g a polyolefin and other resin.
Material Used for Sli~lin~ Counl~, v&- l (SamDle 2) Polyacetal Resin Polyacetal copolymer, Duracon M9044 ( a product of Polyplastics).
ABS = ABS Resin, (~ycolac 5500 (a product of the GE
C~ &ll~ )-PET = 20% glass fiber reinforced polyethylene terephth~l~te, Rynite'~9 530 (a product of E. I. du Pont de Nemours and ~omr~ny).
Test Proce.l~
A polyacetal resin composition sheet (Sample 1) is placed on a tabletop capable of m~kin~ a hol;~onlal 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 hoi i~o~ l 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 me~llred and wear characteristics was calculated by the following equation:
Equation 1 W=KxFxVxT
W = wear volume (inch3) = Wr~ of ~ le I + Wcieht Loss of S~le Average Densi~ of Samples 1 and 2 ~0 95/00585 216 ~ 9 3 4 PCTtUS94tO6760 K = coefficient of wear (inch3/min/ft. lb. hr) F = force (lb) .
V = rate (ft/min) T = time (hr) The test results are given in the following Table. Test Nos. 1-4 are Examples of this invention and Test Nos. 5-6 are Coll,parative Examples. It should be understood from these results that the samples co~ isil~g the composition of this invention exhibit nearly col~la.,l wear 10 characteristics regardless of the m~teri~l used for the counte.~a. L material which comes in contact therewilh.
WO 95/00585 PCT/US94/06760 ~
~ ~ 6 ~ 6 -g g ~ g ' O G ~`
~ 5 ~ g ~ g o ~ ~ ~t ~ ~ _ _ ~,, 3 ~
~ .
o ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢
~ ,, , ~ ~ ~ ~ ~ ~ ~ ~ t` X
~o 95/00585 ~ 9 3 ~1 PCT/US94/06760 , The polyacetal resin composition of this invention constantly gives excellent friction-wear re~ t~nce characteristics regardless of the sliding conditions, such as load and speed, or regardless of the material of the counter surface. In particular, the polyacetal resin composition of this S 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.
Extensive studies were carried out on a polyacetal resin 5 composition that provides a stable friction-wear characteristic regardless of the dirrerellce in the material of the sliding material which comes in contact therewith, even under high speed, high load sliding conditions, without losing the excellent polyacetal resin properties, which led to the finding that an effective method is to incol~ol~te not more than 15% by weight of a 10 polyolefin resin that has a density of not higher than 0.93 g/cm3 and a weight average molecular weight of not more than 500,000.
Thus, the present invention relates to a polyacetal resin composition coll~ isi-~g not more than l5~o by weight of a polyolefin resin, preferably at least O.S% by weight up to 15% by weight, that has a density of 15 not more than 0.93 g/cm3 and a weight average molecular weight of less than 500,000.
By the term "polyacetal resin'r, is meant not only a polyacetal homopolyrner, but also a polyacetal copolymer with a cyclic either or a cyclic polymer. It is, ho~.~ver, preferred to use a polyacetal homopolymer bccause 20 the addition of a lubricant to a copolymer sometimes will reduce its physicalproperties (tensile characteristics, Izod impact characteristics, flexural characteristics, colnpl e;,~ion properties, and the like).
The term polyolefin resin, as used in this invention, refers to aliphatic-alpha-olefin homopolymers, such as polyethylene, poly~o~ylene, 25 and polymethyl pentene, or copolymers of aliphatic-alpha-olefins themselves. Such copolyrners may contain a small ~mr~11nt of a diene-type hydrocarbon comonomer. The polyolefin resin used in this invention must have a density of not higher than 0.93 g/cm3 and a weight average mo1ec 11~r weight of not higher than 500,000. Polyolefins having such ~en~itieS and 30 molecular weights disperse in the polyacetal in fine particles of not more than 10 microns in size. Plefelled polyoleffn resins which are colnmercially readily available are polyethylene and poly~rol)ylene, most preferably polyethylene.
The polyacetal resin composition of this invention is obtained by 35 mixing at least 85% by weight of a polyacetal resin and up to 15%, inclusive,by weight of a polyolefin resin in a COll~ elllional mixer. The polyolefin resin 0 95/00585 2 1 6 ~ 9 3 L~ PCT/US94/06760 i should be used normally in an amount of at least O.5~o by weight, ~r~Çc~ably 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 processabili~r.
The polyacetal resin colllyosilion 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 bec~lse 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 nllcle~ting agent, an ~ntict~tic agent, a flame retardant, a colorant, a lubricant, or the like, as well as with fibrous or granular fillers or reh-rorcillg agents.
The out~t~nrling wear characteristics of the polyacetal resin composition of this invention are spe~ific~lly shown below. The following materials were used:
Polyacetal Res~n Col..vcsilio.. (Saml~le l) Polyacetal Resin A. Polyacetal Homopolymer, Delrin~ 900NC (a product of E. I.
du Pont de Nemours and Co.,.pa~
Resins Incorporated (F'~ ne Resins Pnd O~her Resins) HDPE = High-density polyethylene, HD 6733.19 (a product of the EDcon ~"'l'~"Y) Density: 0.95 g/cm3 r T T~PE = Linear low-density polyethylene, LL 6101.59 (a product of the Exxon ~o~ y) Density: 0.92g/cm3 LDPE = Low-density polyethylene, KN 230 (a product of the Chevron Chemical Con~a,y) Density: 0.92 g/cm3 EPDM = Ethylene propylene diene copolymer, Nordel 3681 (a product of E. I. du Pont de Nemours and Comp~ny) Density: 0.86 g/cm3 wo g~/00585 1 ~ 4 9 3 ~ PCT/US94/06760 EVA = Ethylene-vinyl acetate copolyrner, ELVAX 40 ( a product of E. I. du Pont de Nemours and .. Co~ a,ly) Density: 0.95 g/cm3 S PE-g-As = Polyethylene-styrene/acIylonitrile grafted copolymer, Modiper 1400 (a product of Nippon Yushi) Density: 0.97g/cm3 The specimen~ of Test 1 each contained 2.0~o of a resin additive 10 col~ l isil,g a polyolefin and other resin.
Material Used for Sli~lin~ Counl~, v&- l (SamDle 2) Polyacetal Resin Polyacetal copolymer, Duracon M9044 ( a product of Polyplastics).
ABS = ABS Resin, (~ycolac 5500 (a product of the GE
C~ &ll~ )-PET = 20% glass fiber reinforced polyethylene terephth~l~te, Rynite'~9 530 (a product of E. I. du Pont de Nemours and ~omr~ny).
Test Proce.l~
A polyacetal resin composition sheet (Sample 1) is placed on a tabletop capable of m~kin~ a hol;~onlal 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 hoi i~o~ l 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 me~llred and wear characteristics was calculated by the following equation:
Equation 1 W=KxFxVxT
W = wear volume (inch3) = Wr~ of ~ le I + Wcieht Loss of S~le Average Densi~ of Samples 1 and 2 ~0 95/00585 216 ~ 9 3 4 PCTtUS94tO6760 K = coefficient of wear (inch3/min/ft. lb. hr) F = force (lb) .
V = rate (ft/min) T = time (hr) The test results are given in the following Table. Test Nos. 1-4 are Examples of this invention and Test Nos. 5-6 are Coll,parative Examples. It should be understood from these results that the samples co~ isil~g the composition of this invention exhibit nearly col~la.,l wear 10 characteristics regardless of the m~teri~l used for the counte.~a. L material which comes in contact therewilh.
WO 95/00585 PCT/US94/06760 ~
~ ~ 6 ~ 6 -g g ~ g ' O G ~`
~ 5 ~ g ~ g o ~ ~ ~t ~ ~ _ _ ~,, 3 ~
~ .
o ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢
~ ,, , ~ ~ ~ ~ ~ ~ ~ ~ t` X
~o 95/00585 ~ 9 3 ~1 PCT/US94/06760 , The polyacetal resin composition of this invention constantly gives excellent friction-wear re~ t~nce characteristics regardless of the sliding conditions, such as load and speed, or regardless of the material of the counter surface. In particular, the polyacetal resin composition of this S 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.
Claims (3)
1. A polyacetal resin composition comprising up to 15% by weight, inclusive, of a polyolefin resin having a density of not more than 0.93 g/cm3 and a weight average molecular weight of less than 500,000.
2. The composition of Claim 1 wherein the polyacetal is a homopolymer.
3. The composition of Claim 1 wherein the polyacetal is a copolymer.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14332293A JPH073118A (en) | 1993-06-15 | 1993-06-15 | Polyacetal resin composition |
| JP5-143322 | 1993-06-15 | ||
| US25940794A | 1994-06-14 | 1994-06-14 | |
| US08/259,407 | 1994-06-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2164934A1 true CA2164934A1 (en) | 1995-01-05 |
Family
ID=26475090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002164934A Abandoned CA2164934A1 (en) | 1993-06-15 | 1994-06-15 | Polyacetal resin composition |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0703947A4 (en) |
| KR (1) | KR960703154A (en) |
| CA (1) | CA2164934A1 (en) |
| WO (1) | WO1995000585A2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3102890B2 (en) * | 1994-10-24 | 2000-10-23 | 旭化成工業株式会社 | Polyoxymethylene resin composition |
| JP3078580B2 (en) * | 1996-04-23 | 2000-08-21 | 旭化成工業株式会社 | Polyoxymethylene resin composition |
| US8097670B2 (en) | 2006-06-15 | 2012-01-17 | Mitsubishi Engineering-Plastics Corporation | Polyacetal resin composition, process for producing the same, and sliding member molded from the resin composition |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53111348A (en) * | 1977-03-10 | 1978-09-28 | Asahi Chem Ind Co Ltd | Polyoxymethylene composition |
| DE3485517D1 (en) * | 1983-05-10 | 1992-04-02 | Mitsui Petrochemical Ind | COMPOSITION OF ACETAL RESIN. |
| US4873282A (en) * | 1987-05-15 | 1989-10-10 | Mitsubishi Petrochemical Co., Ltd. | Polyacetal resin composition |
| DE69019474T2 (en) * | 1989-11-28 | 1996-03-07 | Asahi Chemical Ind | Wear-resistant polyoxymethylene resin composition and process for its manufacture. |
| EP0554392B1 (en) * | 1990-10-22 | 1996-03-13 | E.I. Du Pont De Nemours And Company | Polyoxymethylene compositions containing linear low density polyethylene |
-
1994
- 1994-06-15 KR KR1019950705682A patent/KR960703154A/en not_active Application Discontinuation
- 1994-06-15 CA CA002164934A patent/CA2164934A1/en not_active Abandoned
- 1994-06-15 EP EP94921961A patent/EP0703947A4/en not_active Withdrawn
- 1994-06-15 WO PCT/US1994/006760 patent/WO1995000585A2/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| KR960703154A (en) | 1996-06-19 |
| WO1995000585A2 (en) | 1995-01-05 |
| EP0703947A4 (en) | 1996-06-05 |
| EP0703947A1 (en) | 1996-04-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |