WO2006025547A1 - ポリアセタール樹脂組成物 - Google Patents
ポリアセタール樹脂組成物 Download PDFInfo
- Publication number
- WO2006025547A1 WO2006025547A1 PCT/JP2005/016164 JP2005016164W WO2006025547A1 WO 2006025547 A1 WO2006025547 A1 WO 2006025547A1 JP 2005016164 W JP2005016164 W JP 2005016164W WO 2006025547 A1 WO2006025547 A1 WO 2006025547A1
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- WO
- WIPO (PCT)
- Prior art keywords
- polyacetal resin
- glass
- weight
- resin composition
- parts
- Prior art date
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/40—Glass
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
-
- 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
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
- C08K5/3477—Six-membered rings
- C08K5/3492—Triazines
- C08K5/34922—Melamine; Derivatives thereof
-
- 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
- C08K5/54—Silicon-containing compounds
- C08K5/544—Silicon-containing compounds containing nitrogen
-
- 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
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/14—Glass
-
- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
-
- 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
Definitions
- the present invention relates to a polyacetal resin composition having excellent mechanical properties.
- the present invention solves the problems of the prior art and provides a polyacetal resin material having further excellent mechanical properties.
- the polyacetal resin material has various stability and mechanical properties that have been particularly demanded in recent years. The purpose is to provide.
- (D) relates to a polyacetal resin composition
- a polyacetal resin composition comprising a triazine derivative having a nitrogen-containing functional group added in an amount 2 to 10 times the amount of component (C).
- the present invention comprises (ii) 100 parts by weight of a polyacetal resin, (ii) 3 to 200 parts by weight of a glass filler, (C) 0.001 to 3.0 parts by weight of a boric acid compound, and (D) A polyacetal resin composition comprising a triazine derivative having a nitrogen-containing functional group, wherein (D) is 2 to 10 parts by weight per 1 part by weight of component (C).
- the polyacetal resin ( ⁇ ) used in the present invention is a high molecular compound having an oxymethylene group (one CH 2 0—) as a main structural unit, and is basically a polyoxymethylene homopolymer consisting only of repeating units of an oxymethylene group, Copolymers containing a small amount of other structural units in addition to the group (including block copolymers) and evening polymers may be used, and the molecule may have a branched or crosslinked structure as well as a linear shape. .
- homopolymers are produced by polymerization of anhydrous formaldehyde or trioxane, a cyclic trimer of formaldehyde. It is usually stabilized against thermal decomposition by terminal cap.
- the copolymer has a C0—repeat group of about 85-99.9 mole percent, having the general formula:
- Rj and are hydrogen, lower alkyl and octalogen substituted lower alkyl, respectively.
- Each R 3 is selected from the group consisting of methylene, oxymethylene, lower alkyl and haloalkyl substituted methylene, and lower alkyl and haloalkyl substituted oxymethylene groups, and m is an integer from 0 to 3,
- Each lower alkyl group is a polymer compound having a weight average molecular weight of 5000 or more, in which groups represented by the above formula are interspersed in a residual ratio.
- cyclic oligomer of formaldehyde represented by the formula or general formula (C3 ⁇ 40) n (where n is an integer of 3 or more), for example, trioxane, cyclic ether and / or cyclic formal, Usually, it is stabilized against thermal decomposition by removing the unstable portion at the end by hydrolysis.
- cyclic ether or cyclic formal for copolymerization include ethylene oxide, 1,3-dioxolan, diethylene glycol formal, 1,4 monobutanediol formal, and the like.
- a component for adjusting the molecular weight can be used in combination.
- a component for adjusting the molecular weight a chain transfer agent that does not form an unstable terminal, that is, has an alkoxy group such as methylal, methoxymethylal, dimethoxymethylal, trimethoxymethylal, and oxymethylenedi-n-butyl ether. Examples include one or more compounds.
- the terpolymer is produced by adding a monofunctional compound capable of forming a branched chain such as a monodaricidyl ether compound or a polyfunctional compound such as a diglycidyl ether compound in the above copolymerization.
- the polyacetal resin used in the present invention is not particularly limited, but preferably has a small number of 1 OH end groups, and particularly preferably 5 mniol / kg or less.
- Use of polyacetal resin with a large number of OH end groups has the advantage that high mechanical properties can be obtained, but due to instability of end groups, many mold deposits are generated during molding. In addition, the emission of formaldehyde from the molded article increases. Will be.
- the use of a polyacetal resin having a small number of 10H terminal groups is a factor that adversely works from the viewpoint of mechanical properties.
- the mechanical properties can be maintained at a high level, and the amount of formaldehyde generated and released from polyacetyl resin and its molded products is greatly reduced due to the small number of 10H terminal groups. And both characteristics are balanced.
- the number of —OH terminal groups of such a polyacetal resin can be adjusted as follows.
- the amount of water and the amount of catalyst during polymerization greatly contribute to the —OH terminal group number of the polyacetal resin obtained by polymerization, and the proportion of the amount of catalyst contributed as the amount of water during polymerization increases. It is known that the amount of water during polymerization is dominant. In particular, in the production of copolymers, the amount of water contained in trioxane, which is the main monomer, greatly affects. That is, a polyacetal resin having a large number of 10H terminal groups can be obtained by using a raw material monomer having a high water content. On the other hand, as the amount of water contained in the monomer decreases, the proportion of the catalyst amount that contributes to the formation of 10 H end groups gradually increases. By reducing the amount of the catalyst, it is possible to obtain a polycarbonate resin having a smaller number of OH terminal groups.
- the glass-based filler (B) used in the present invention there are no particular restrictions on the shape, such as fiber, granule, powder, plate, and hollow, and typical examples are glass fibers. Glass beads, milled glass fibers, glass flakes, and glass balloons are exemplified, and glass fibers are particularly preferable. In the present invention, these glass-based fillers can be used alone or in admixture of two or more depending on the purpose.
- the compounding amount of the glass-based filler (B) is 3 to 200 parts by weight, preferably 5 to 150 parts by weight, particularly preferably 100 parts by weight of the polyacetyl resin (A). 10 to 100 parts by weight. If it is less than 3 parts by weight, the mechanical properties are insufficiently improved, and if it exceeds 200 parts by weight, it becomes difficult to form.
- these glass-based inorganic fillers may be untreated, but it is preferable to use those surface-treated with a silane-based or titanate-based coupling agent.
- silane coupling agent examples include vinyl alkoxysilane, epoxy alkoxysilane, aminoalkoxysilane, mercaptoalkoxysilane, arylalkoxysilane, and the like, and aminoalkoxysilane is particularly preferable.
- vinylalkoxysilane examples include vinyltriethoxysilane, vinyltrimethoxysilane, vinyltris (jS-methoxyethoxy) silane, and the like.
- epoxyalkoxysilane examples include glycidoxypropyl trimethoxysilane, -3- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, and glycidoxypropyltriethoxysilane. .
- aminoalkoxysilane examples include aminoaminopropyl trimethoxysilane, aminopropyltriethoxysilane, aminopropylmethyldimethoxysilane, aminopropyl trimethoxysilane, and N-phenol. Examples thereof include diarylaminopropyltrimethoxysilane and the like.
- Examples of mercaptoalkoxysilanes include mercaptopropyltrimethoxysilane, and mercaptopropyltriethoxysilane.
- Examples of the arylalkoxysilane include allylaminopropyl trimethoxysilane, allylaminopropyl trimethoxysilane, allylthiopropyl trimethoxysilane, and the like.
- titanate-based surface treatment agents examples include titanium-1i-propoxyoctylene glycolate, tetra-n-butoxytitanium, tetrakis (2- Tilhexoxy) and the like. Although any surface treatment agent can be used, the intended effect of the present invention can be obtained.
- aminoalkoxysilane is a particularly preferred surface treatment agent.
- the amount of the surface treatment agent used is 0.01 to 20 parts by weight, preferably 0.05 to 10 parts by weight, particularly preferably 0.05 to 5 parts by weight, based on 100 parts by weight of the glass filler.
- the glass fiber those using a polymer binder, an adhesion promoter, other auxiliaries and the like as the sizing agent are preferably used.
- the polymer binder generally known organic materials such as water-dispersible Z water-soluble polyvinyl acetate, polyester, epoxide, polyurethane, polyacrylate or polyolefin resin, and mixtures thereof are preferably used.
- examples of the boric acid compound (C) used in the present invention include orthoboric acid, metaboric acid, tetraboric acid, and diboron trioxide, and commercially available products can be used.
- the compounding amount of the boric acid compound (C) in the present invention is 0.001 to 3 parts by weight, preferably 0.001 to 1 part by weight, particularly preferably 100 parts by weight of the polyacetal resin (A). 0.01 to 0.5 parts by weight. If it is less than 001 parts by weight, the desired effect cannot be obtained, and if it exceeds 3 parts by weight, thermal stability becomes a problem.
- Examples of the triazine derivative having a nitrogen-containing functional group (D) used in the present invention include guanamine, melamine, N-butylmelamine, N-phenylmelamine, N, N-diphenylmelamine, N, N— Diarylmelamine, N, N ', N-triphenylmelamine, benzoguanamine, acetoguanamine, 2,4-diamino 6 — petit sym— ⁇ lyazine, amelin, 2, 4-diamino 6-benzyloxy sym _triazine, 2, 4-dianamino 6-butoxy sym-triazine, 2,4-diamino 6-cyclohexyl lu sym-triazine, 2,4-diamino 6-closyl sym-triazine, 2,4-diamino 6-mercapto sym _ ⁇ lyazine, 2 , 4—Di
- the blending amount of the triazine derivative having a nitrogen-containing functional group as component (D) is 2 to 10 times (weight ratio) with respect to the amount of boric acid compound added to component (C), preferably 3 Double to 8 times, particularly preferably 4 to 6 times. If it is less than 2 times, it is difficult to obtain the desired effect, and if it is more than 10 times, the additive will ooze out and the physical properties will deteriorate, such being undesirable.
- the polyacetal resin composition of the present invention may further contain various known stabilizers / additives.
- the stabilizer include one or more of hindered phenol compounds, alkali or alkali earth metal hydroxides, inorganic salts, carboxylates, and the like.
- the additive used in the present invention is a general additive for thermoplastic resins, for example, any of coloring agents such as dyes and pigments, lubricants, nucleating agents, release agents, antistatic agents, and surfactants. One or more can be mentioned.
- inorganic, organic, and metallic fibers other than glass fillers, plates, powders, etc. It is also possible to mix one type or two or more types of fillers. Examples of such fillers include talc, my strength, wollastonite, carbon fiber, etc. However, it is not limited to these at all.
- the method for preparing the composition of the present invention is not particularly limited, and it can be easily prepared by a known facility and method generally used as a conventional resin composition preparation method. For example, i) A method in which each component is mixed and then kneaded and extruded by an extruder to prepare pellets, and then formed into pellets.ii) Once a pellet having a different composition is prepared, a predetermined amount of the pellet is mixed and molded And iii) a method in which one or more of each component is directly charged into a molding machine. In addition, mixing a part of the resin component as a fine powder with other components and adding it is a preferable method for uniformly blending these components.
- the resin composition according to the present invention can be molded by any of extrusion molding, injection molding, compression molding, vacuum molding, blow molding, and foam molding.
- a tensile test piece according to ISO3 1 6 7 was left for 48 hours at a temperature of 2 3 and a humidity of 50%, and measured according to ISO 5 2 7.
- a polyacetal resin dissolved in HFIP (hexafluoroisopropanol) and silylated was subjected to NMR to measure the number of terminal —0H groups.
- the sample polyoxymethylene composition was continuously molded using an injection molding machine under the following conditions for 24 hours, and then the amount of mold deposits was visually observed. A (very small) 1 B— C— D— E (multiple (There are deposits on the entire surface.)) (Mold)
- the range of deposits attached to the mold cavity and the state of the deposits were evaluated.
- the range of deposits was used as a temporary standard, and the final evaluation was made by adjusting the range of deposits and other factors.
- A The range of deposits is generally less than 10% in the mold cavity.
- the range of the deposit is about 60 to 80% in the mold cavity.
- the water content of trioxane used here was 10 ppm, and the water content of 1,3-dioxolan was 20 ppm.
- the reaction product discharged from the polymerizer is quickly passed through a crusher, and added to a 60 ° C aqueous solution containing 0.05% by weight of triethylamine to deactivate the catalyst. After separation, washing, and drying A crude polyacetal resin was obtained.
- the polyacetal resin (a-2) was prepared in the same manner as the polyacetal resin (a-1) except that the amount of catalyst added was reduced to 15 ppm.
- the obtained polymer had an OH terminal group number of 3.1 mol / kg and a melt index of 9.9 g / min.
- the molecular weight of the polymer still obtained even if the water content of the trioxane is changed by using trioxane whose water content is changed by adding water to the trioxane used for the preparation of the polyacetal resin (a-1).
- the polyacetal resin was prepared in the same manner as the preparation of the polyacetal resin (a-1) except that the amount of the molecular weight modifier was changed to adjust the melt properties as a substitute property to be almost the same.
- Table 1 shows the content, the amount of molecular weight regulator (methylal) added, the number of 10H terminal groups and the melt index of the polymer obtained.
- Table 2 shows the various glass fibers (B 1 to B3), boric acid compounds (C 1 to C3), and triazine derivatives (D1 to D3) having nitrogen-containing functional groups shown below on the polyacetal resin (a-1).
- the mixture was blended at the indicated ratio and melt-kneaded with an extruder having a cylinder temperature of 200 ° C. to prepare a pellet-shaped composition.
- a test piece was molded from the pellet-shaped composition using an injection molding machine, and physical properties were evaluated. The results are shown in Table 2.
- B 1 Glass fiber surface-treated with aminopropyltriethoxysilane
- B2 Titanium one Glass fiber surface-treated with i-propoxyoctylene glycolate
- Polyacetal resins (a-1) to (a-5) with different terminal 10H groups, glass fibers (B1 to B3), boric acid compounds (C1 to C3), and triazine derivatives with nitrogen-containing functional groups ( D1-D3) were blended in the proportions shown in Table 3, and melt-kneaded with an extruder having a cylinder temperature of 200 ° C. to prepare a pellet-shaped composition. Next, a test piece was molded from the pellet-shaped composition using an injection molding machine, and physical properties were evaluated. The results are shown in Table 3. Table 3
- Table 4 shows the various glass beads (B4 to B7), boric acid compounds (C1 to C3), and triazine derivatives (D1 to D3) having nitrogen-containing functional groups shown below on the polyacetal resin (a-1).
- the pellets were blended at the indicated ratio and melt-kneaded with an extruder at a cylinder temperature of 200 to prepare a pellet-like composition.
- a test piece was molded from this pellet-shaped composition using an injection molding machine, and physical properties were evaluated. The results are shown in Table 4.
- Polyacetal resin (a-1) is blended with the following glass flakes (B10), borated compounds (C1 C3), and triazine derivatives (D1 D3) having nitrogen-containing functional groups in the proportions shown in Table 6.
- a pellet-like composition was prepared by melt-kneading with an extruder at a temperature of 200 ° C. Next, a test piece was molded from the pellet-shaped composition using an injection molding machine, and the physical properties shown below were evaluated. The results are shown in Table 6. On the other hand, for comparison, a pellet-like composition was prepared in the same manner for (C) when no boric acid compound was added and (D) when no lyazine derivative having a nitrogen-containing functional group was added. Went. The results are also shown in Table 6.
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Abstract
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004256924A JP4549784B2 (ja) | 2004-09-03 | 2004-09-03 | ポリアセタール樹脂組成物 |
JP2004-256924 | 2004-09-03 |
Publications (1)
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WO2006025547A1 true WO2006025547A1 (ja) | 2006-03-09 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/016164 WO2006025547A1 (ja) | 2004-09-03 | 2005-08-29 | ポリアセタール樹脂組成物 |
Country Status (4)
Country | Link |
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JP (1) | JP4549784B2 (ja) |
CN (1) | CN100567391C (ja) |
TW (1) | TWI366586B (ja) |
WO (1) | WO2006025547A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1887043A1 (en) * | 2006-08-11 | 2008-02-13 | Polyplastics Co., Ltd. | Polyacetal resin composition |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5685940B2 (ja) * | 2008-03-11 | 2015-03-18 | 三菱瓦斯化学株式会社 | ポリアセタール樹脂組成物 |
JP5661437B2 (ja) * | 2010-11-29 | 2015-01-28 | ポリプラスチックス株式会社 | ポリアセタール樹脂組成物 |
JP6563292B2 (ja) * | 2015-09-25 | 2019-08-21 | 旭化成株式会社 | ポリアセタール樹脂組成物及びその成形体 |
JP2017066285A (ja) * | 2015-09-30 | 2017-04-06 | ポリプラスチックス株式会社 | ポリアセタール樹脂組成物 |
JP2017179265A (ja) | 2016-03-31 | 2017-10-05 | ポリプラスチックス株式会社 | ポリアセタール樹脂組成物 |
WO2017169438A1 (ja) * | 2016-03-31 | 2017-10-05 | ポリプラスチックス株式会社 | ポリアセタール樹脂組成物 |
JP6832151B2 (ja) * | 2016-12-21 | 2021-02-24 | ポリプラスチックス株式会社 | ポリアセタール樹脂組成物の製造方法 |
JP6835650B2 (ja) * | 2017-03-30 | 2021-02-24 | ポリプラスチックス株式会社 | ポリアセタール樹脂組成物 |
JP7057113B2 (ja) * | 2017-12-08 | 2022-04-19 | 旭化成株式会社 | 樹脂組成物及び樹脂成形体 |
JP7240468B1 (ja) * | 2021-10-04 | 2023-03-15 | ポリプラスチックス株式会社 | ポリアセタール樹脂組成物 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5966447A (ja) * | 1982-10-08 | 1984-04-14 | Mitsubishi Gas Chem Co Inc | アセタ−ル樹脂組成物 |
JPS59159846A (ja) * | 1983-03-03 | 1984-09-10 | Mitsubishi Gas Chem Co Inc | アセタ−ル樹脂組成物 |
JPS6044543A (ja) * | 1983-08-22 | 1985-03-09 | Mitsubishi Gas Chem Co Inc | アセタ−ル樹脂組成物 |
JPH101593A (ja) * | 1996-06-19 | 1998-01-06 | Polyplastics Co | ポリアセタール樹脂組成物 |
JPH1036630A (ja) * | 1996-07-30 | 1998-02-10 | Polyplastics Co | ポリオキシメチレン組成物 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4652594A (en) * | 1985-10-16 | 1987-03-24 | Celanese Corporation | Glass fiber-reinforced oxymethylene polymer molding compositions having mechanical properties enhanced by amino-formaldehyde resin coupling agents |
JP3164696B2 (ja) * | 1993-06-22 | 2001-05-08 | ポリプラスチックス株式会社 | ポリアセタール樹脂組成物 |
JP2000007884A (ja) * | 1998-06-24 | 2000-01-11 | Mitsubishi Gas Chem Co Inc | ポリオキシメチレン樹脂組成物 |
JP4979857B2 (ja) * | 2001-06-15 | 2012-07-18 | ポリプラスチックス株式会社 | ポリアセタール樹脂組成物 |
-
2004
- 2004-09-03 JP JP2004256924A patent/JP4549784B2/ja active Active
-
2005
- 2005-08-29 TW TW094129460A patent/TWI366586B/zh active
- 2005-08-29 WO PCT/JP2005/016164 patent/WO2006025547A1/ja active Application Filing
- 2005-08-29 CN CNB2005800296974A patent/CN100567391C/zh active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5966447A (ja) * | 1982-10-08 | 1984-04-14 | Mitsubishi Gas Chem Co Inc | アセタ−ル樹脂組成物 |
JPS59159846A (ja) * | 1983-03-03 | 1984-09-10 | Mitsubishi Gas Chem Co Inc | アセタ−ル樹脂組成物 |
JPS6044543A (ja) * | 1983-08-22 | 1985-03-09 | Mitsubishi Gas Chem Co Inc | アセタ−ル樹脂組成物 |
JPH101593A (ja) * | 1996-06-19 | 1998-01-06 | Polyplastics Co | ポリアセタール樹脂組成物 |
JPH1036630A (ja) * | 1996-07-30 | 1998-02-10 | Polyplastics Co | ポリオキシメチレン組成物 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1887043A1 (en) * | 2006-08-11 | 2008-02-13 | Polyplastics Co., Ltd. | Polyacetal resin composition |
US7619020B2 (en) | 2006-08-11 | 2009-11-17 | Polyplastics Co., Ltd. | Polyacetal resin composition |
CN101121810B (zh) * | 2006-08-11 | 2011-06-08 | 宝理塑料株式会社 | 聚缩醛树脂组合物 |
Also Published As
Publication number | Publication date |
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JP2006070196A (ja) | 2006-03-16 |
CN101010380A (zh) | 2007-08-01 |
JP4549784B2 (ja) | 2010-09-22 |
TW200617095A (en) | 2006-06-01 |
TWI366586B (en) | 2012-06-21 |
CN100567391C (zh) | 2009-12-09 |
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