WO1991000891A1 - Composition de resine de polypropylene - Google Patents
Composition de resine de polypropylene Download PDFInfo
- Publication number
- WO1991000891A1 WO1991000891A1 PCT/JP1990/000891 JP9000891W WO9100891A1 WO 1991000891 A1 WO1991000891 A1 WO 1991000891A1 JP 9000891 W JP9000891 W JP 9000891W WO 9100891 A1 WO9100891 A1 WO 9100891A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- polypropylene resin
- weight
- resin composition
- parts
- metal
- Prior art date
Links
Classifications
-
- 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
- C08L23/10—Homopolymers or copolymers of propene
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- 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
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
-
- 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
- C08K5/49—Phosphorus-containing compounds
- C08K5/51—Phosphorus bound to oxygen
- C08K5/52—Phosphorus bound to oxygen only
- C08K5/527—Cyclic esters
Definitions
- the present invention has an excellent transparency in a hot water extraction accelerated test of a polypropylene resin irradiated with radiation for sterilization and having a very small decrease in pH of the extract.
- the present invention relates to a pyrene resin composition.
- Polypropylene resin has good mechanical properties, heat resistance, chemical resistance, and excellent hygiene, so it is used in food containers, for example, tableware, frozen dessert containers, trays, and instant foods. It is widely used for containers, margarine containers, etc., and also for medical devices such as syringe syringes, spit tubes, infusion containers, and cylinders.
- a method for improving the transparency of the polypropylene resin a method of adding a nucleating agent is generally widely used, and generally, a method of adding a sorbitol derivative is used. Or Jia The addition of metal salts of phosphate phosphate is being carried out.
- those which have the effect of improving the transparency of the polypropylene resin include 1,3,2,4-dibenzylidene sonolebitol, 1 ⁇ 3, 2, 4-di (methylbenzylidene) sonovitor, and 1, 3, 2, 4 -ge (ethylbenzilidene) solvitol.
- Polypropylene resin compositions to which 13, 2 ⁇ 4-dibenzylidene sorbitol has been added have little appearance of suspended solids after immersion in hot water and cooling of the extract, but have low transparency. Not very good.
- diaryl phosphate those which have the effect of improving the transparency of the polypropylene resin are described as 2,2'-methylenebis (4, 6-g Sodium monobutylphenyl) phosphate, 2,2'-Methylenebis (4,6-di-t-butyllithium) Lithium phosphate, G [2,2'-methyl Bis (4,6-dibutyltinphenyl) phosphoric acid] potassium, 2,2'-methylbis (4-methyl-6-tert-butylphenyl) sodium phosphate, 2, 2'-Methylene-bis (4-ethyl-6-t-butylphenyl) phosphoric acid There is sodium, etc.
- Polypropylene resin compositions to which these diaryl phosphate metal salts have been added have no appearance of suspended matter after immersion in hot water and cooling of the extract, and have good transparency.
- the polypropylene resin composition was irradiated with radiation for sterilization, there was a difference in the PH of the extract in the hot water extraction promotion test before and after the radiation, and In pH, the pH is greatly reduced. Therefore, there is a problem in using it as a container for irradiating and sterilizing aqueous solution for sterilization.
- An object of the present invention is to provide a container which is excellent in transparency and which does not alter the content of a liquid contained in a container which has been irradiated for sterilization.
- An object of the present invention is to provide a polypropylene resin composition in which the pH of the extract is extremely small in a hot water extraction promotion test of the pyrene resin composition.
- the present inventors have conducted intensive studies in order to solve the above-mentioned drawbacks of a polypropylene resin composition having improved transparency by adding a crystal nucleating agent.
- the composition comprising an aryl phosphate metal salt and an alkali metal or alkaline earth metal or aluminum group metal
- the inventors have found that the addition of an oxide is effective, and have completed the present invention.
- a metal salt of diallyl phosphate is added (JP-A-61-53344). It is known to add a metal salt of a metal with a Group I metal salt of the periodic table or a hydrotalcite (JP-A-63-69853).
- JP-A-63-69853 When the added polypropylene resin is irradiated with radiation, a significant drop in the pH of the extract in the accelerated hot water extraction test is caused by the alkali metal or alkaline earth metal or aluminum group. It is not known at all that improvement can be achieved by adding a metal hydroxide, and this effect is a surprising finding. Based on this discovery, it was possible to obtain a polypropylene resin composition which was excellent in transparency and did not alter the content of the liquid. This is completely unthinkable from previous knowledge.
- the present invention relates to 100 parts of a polypropylene resin, and the general formula (I)
- R! And R 2 are each a hydrogen atom or an alkyl group, M is an alkali metal or an alkaline earth metal, n is an integer of 1 or 2, and A is an alkyl group.
- Polypropylene resin composition characterized by containing 0.001 to 1.0 parts by weight of a hydroxide of
- the propylene resin used in the present invention may be any of propylene homopolymer, propylene-ethylene copolymer, propylene-olefin copolymer, and the like. Or a mixture of these.
- a particularly preferred polypropylene resin in which the effects of the present invention are most remarkably exhibited is a propylene-ethylene-lamp-dam copolymer which has an ethylene content of 2 to 6% by weight. .
- examples of the alkyl group represented by 1 ⁇ and R 2 include, for example, methyl, ethyl, and propyl. Pill, isopropyl, butyl, second butyl, tertiary butyl, isobutyl, amide, tertiary amide, hexyl, octyl, tertiary octyl, etc.
- Examples of the alkylidene group represented by A include methylidene, ethylidene, butylidene, and isopropylidene.
- Metals represented by M include sodium and metal And lithium, calcium, magnesium, magnesium, and the like.
- the amount of the diaryl phosphate metal salt represented by these general formulas (I) is from 0.01 to 1 part by weight based on 100 parts by weight of the polypropylene resin. 0 parts by weight, preferably 0,05
- the addition of less than 0.01 part by weight has little effect on the improvement of the transparency of the molded article, and the addition over 1.0 part by weight The effect is not so great and the manufacturing cost is high.
- the alkali metal, the alkaline earth metal, and the aluminum group metal may be lithium or lithium.
- examples include sodium, potassium, magnesium, calcium, strontium, rhodium, and aluminum.
- the amount of the alkali metal, alkaline earth metal, or aluminum group metal hydroxide added is 0.0001 to 1.0 weight per 100 weight parts of the polypropylene resin. Parts, preferably 0.01 to 0.5 parts by weight, and when less than 0.01 part by weight, the ⁇ ⁇ of the extract was measured in the hot water extraction acceleration test after irradiation. The effect of suppressing the decrease is negligible, and even if added in excess of 1.0 part by weight, the effect does not increase so much, or the decrease in transparency occurs. ⁇
- the diallyl phosphate metal represented by the general formula (I) is used.
- the effect can be achieved by using the salt and the above-mentioned hydroxide in the above-mentioned amounts, respectively.However, even after irradiating the container with radiation for sterilization, it is more preferable that the inner solution is not deteriorated.
- the amount of the hydroxide added is 3 to 50% by weight of the amount of the diallyl phosphate metal salt represented by the general formula (I). This is preferred.
- additives for example, an antioxidant, a light stabilizer, an ultraviolet absorber, a pigment, a dispersant, a neutralizing agent, and the like can be added to the resin composition of the present invention.
- an antioxidant for example, an antioxidant, a light stabilizer, an ultraviolet absorber, a pigment, a dispersant, a neutralizing agent, and the like
- tris (2,4-di-tert-butylphenyl) phosphite, 2,6-di-tert-butyl-p-methylphenol may be used as an antioxidant.
- N-octadecyl-3 (4-hydroxy3,5-di-tert-butylphenyl) propionate, tetrakis [methylen-3— (3,5 —Di-tert-butyl-4-hydroxyphenyl) propionate] methane, pentaerythritol luteitrax (3—rauriluthiopropionate), dilaurylthiopropionate Etc.
- Light stabilizers and UV absorbers are 2,2,6,6-tetramethyltinol 4-piperidyl benzoate, bis (2,2,6,6-tetramethyltinol 4-) Piperizyl) senogate, 2—hydroxy 41-n-octoxybenzofenone, 2— (2'-hydroxy 3,5—g-t-butylphenyl) 5 — Black benzotriazole, etc. is a typical example.
- the melt flow index can be controlled by adding a peroxide.
- peroxides examples include 2,5-dimethyl-2,5-bis (t-butylino, 'oxy) hexane, g-tert-butylno,' furolate, and benzoyl peroxide. It is a representative one.
- Examples of the method for producing the polypropylene resin composition of the present invention include: a polypropylene resin, a diphenyl phosphate metal salt represented by the general formula (I), an alkali metal or an alkali metal.
- Known additives to be added to the polypropylene resin in addition to the hydroxides of earth metal or aluminum group metal such as neutralizing agents, antioxidants, light stabilizers, ultraviolet absorbers, A method is used in which an oxide or the like is mixed with a Hensile mixer or other blender, uniformly dispersed, and then melt-pelleted with an extruder.
- the polypropylene composition of the present invention has no appearance of suspended matter after cooling of the extract in hot water extraction, and has little decrease in pH of the extract in hot water extraction acceleration test after irradiation. Because of its excellent transparency and transparency, it can be used in medical devices, food packaging, and other uses without any safety and health problems.
- Propylene-Ethylene Random Copolymer (Melt flow index measured at 230 ° C X 2.16 kg load: 8 g / 10 min, ethylene Content: 4.0 parts by weight 100 parts by weight of powder, 0.2 parts by weight of sodium 2,2'-methylenebis (4,6-di-t-butylphenyl) phosphate 0.03 parts by weight of magnesium hydroxide, 0.1 part by weight of tris (2,4-g-tert-butylphenyl) phosphite as an antioxidant, and 0.2 parts by weight of dimethyl as an ultraviolet absorber Chilzak cinerate 2 — (4-hydroxy 2,2,6,6—tetramethylyl 1 —pyridyl) Ethanol condensate 0.04 parts by weight, add The mixture was mixed with a mixer, and pelletized with an ordinary extruder at an extrusion temperature of about 240 ° C. 7 pellets were irradiated with 2.5 Mrad to this pellet. Sa It was a pull.
- Each pellet before and after irradiation with 7 rays was immersed in 100 CC of pure water in a glass flask of 10 g each, and after boiling for 30 minutes, the pellet was removed and the sample was removed. Liquid. At the same time, pure water was boiled in another container for 30 minutes, and added to the sample solution after removing the pellet to make 10 Occ. The solution was kept at room temperature for 3 hours. The pH of this solution was measured with a pH meter. At the same time, the pH of pure water boiled was also measured as a control sample.
- the evaluation of the suspended matter in the filtrate was performed visually.
- the evaluation is as follows.
- the pellet before irradiation with 7 rays was 210 by an injection molding machine. Injection molding is performed at C to obtain 160 x 80 x 2 thigh flat plates, and the haze of the obtained flat plates is measured using a haze meter.o
- Example I the addition amount of sodium 2,2′-methylenebis ( ⁇ 4,6-di-t-butylphenyl) phosphate was 0.3 parts by weight, A pellet was formed in the same manner as in Example 1, and evaluation was performed in the same manner as in Example 1.
- Example 1 the addition amount of sodium 2,2'-methylenebis (4,6-di-t-butylphenyl) phosphate was 0.4 parts by weight, and the others were the same as in Example 1. Pelletize in the same way as Evaluation was performed in the same manner as in Example 1.
- Example 2 Instead of 0.03 parts by weight of magnesium hydroxide in Example 2, 0.03 parts by weight of aluminum hydroxide was added, and the others were pelletized in the same manner as in Example 2 to obtain a pellet. Evaluation was performed in the same manner as in Example 1.
- Example 2 2,2'-methylenebis (4,6-di-tert-butylphenyl) phosphate in Example 2 was replaced with 0.3 part by weight of 2,2'-methylenebis (4,6-di-tert-butylphenyl) phosphate 0.3 parts by weight of lithium monobis (4,6-di-t-butylphenyl) phosphate were added, and the others were pelletized in the same manner as in Example 2; The evaluation was performed in the same manner as described above.
- a flat plate of 160 ⁇ 80 ⁇ 2 was formed by an injection molding method.
- the injection molding conditions were a molding temperature of about 260 and a mold temperature of about 50.
- the flat plate was irradiated with a line of 2.5 Mrad to obtain a sample.
- Each plate sample before and after irradiation with 7 rays was cut into approximately 5 thigh angles, and 10 g of each was taken as a sample for evaluation.
- a syringe syringe having an inner volume of 5 Occ was molded by an injection molding method.
- the injection molding conditions were a molding temperature of about 260 and a mold temperature of about 15.
- the syringe syringe was irradiated with 7 lines at 2.5 Mrad to obtain a sample.
- Each syringe syringe sample before and after the irradiation was cut into approximately 5 thigh corners, and 1 Og of each was taken as a sample for evaluation.
- Example 2 the amount of sodium 2,2'-methylenebis (4,6-dibutylbutyl) phosphate added was 0.005 parts by weight. Others were pelletized in the same manner as in Example 2 and evaluated in the same manner as in Example 1.
- the transparency is inferior to the composition of the present invention.
- Example 2 The amount of sodium 2,2'-methylenebis (4,6-di-tert.-butylphenyl) phosphate in Example 2 was 1.5 parts by weight, and the others were the same as in Example 2. Pelletization was performed in the same manner as in Example 2, and evaluation was performed in the same manner as in Example 1. Table 1 shows the results.
- the transparency, the hot water extractability, and the decrease in pH of a single hot water extract after irradiation are the same as those of the composition of the present invention, and 2,2'-methyl It is not necessary to add a large amount of sodium bis (4,6-di-t-butylphenyl) phosphate as in the comparative example.
- Example 2 Pelletization was performed in the same manner as in Example 2 except that the amount was 0.0005 parts by weight, and evaluation was performed in the same manner as in Example 1.
- the decrease in the pH of the hot water extract of the pellet after irradiation with this substance is greater than that of the composition of the present invention.
- Example 2 The pellets were pelletized in the same manner as in Example 2 except that the amount of magnesium hydroxide added in Example 2 was 1.5 parts by weight, and the evaluation was performed in the same manner as in Example 1.
- the transparency is inferior to the composition of the present invention.
- Example 2 Instead of 0.03 parts by weight of magnesium hydroxide in Example 2, 0.07 parts by weight of calcium stearate was added, and the other conditions were the same as in Example 2. It was pelletized and evaluated in the same manner as in Example 1. Table 1 shows the results.
- the decrease in pH of the hot water extract of the pellet after irradiation with the radiation is greater than that of the composition of the present invention.
- Example 2 0.3% by weight of sodium 2,2'-methylenebis (4,6-di-t-butylphenyl) phosphate in Example 2 was added and magnesium hydroxide 0 0.07 parts by weight of calcium stearate was added instead of 0.3 parts by weight, and the others were pelletized in the same manner as in Example 2, and the evaluation was performed in the same manner as in Example 1. went.
- Example 2 0.3 part by weight of sodium 2,2'-methylenebis (4,6-di-t-butylphenyl) phosphate was not added, and the others were the same as in Example 2. A pellet was formed in the same manner as in Example 1, and evaluation was performed in the same manner as in Example 1.
- Example 2 instead of 0.3 parts by weight of sodium 2,2'-methylenebis (4,6-di-tert-butylphenyl) phosphate, 1.3,2,4 — Jibenzylidene Solitaire Instead of 0.3 parts by weight of magnesium hydroxide and 0.03 parts by weight, 0.07 parts by weight of stearic acid-potassium was added, and the other conditions were the same as in Example 2. Then, evaluation was performed in the same manner as in Example 1.
- Example 2 1.3, 2, 4 instead of 0.3 parts by weight of sodium 2,2'-methylenebis (4,6-di-t-butylphenyl) phosphate in Example 2 — Add 0.3 parts by weight of di (ethylbenzylidene) sorbitol and 0.07 parts by weight of calcium stearate instead of 0.03 parts by weight of magnesium hydroxide Others were pelletized in the same manner as in Example 2 and evaluated in the same manner as in Example 1.
- This product produced a large amount of suspended solids by hot water extraction.
- Example 2 Instead of 0.03 parts by weight of magnesium hydroxide in Example 2, 0.05 parts by weight of hydrotalcite (DHT 4A manufactured by Kyowa Chemical Co.) was added, and the other conditions were the same as in Example 2. Then, evaluation was performed in the same manner as in Example 1.
- hydrotalcite DHT 4A manufactured by Kyowa Chemical Co.
- Example 2 Instead of 0.03 parts by weight of magnesium hydroxide in Example 2, 0.03 parts by weight of sodium stearate was added, and the pellets were the same as in Example 2 except for the above. And evaluated in the same manner as in Example 1.
- the decrease in pH of the hot water extract of the pellet after irradiation with the radiation is greater than that of the composition of the present invention.
- the polypropylene resin composition of the present invention is excellent in transparency and has a very small decrease in pH of the extract after irradiation of the polypropylene resin in the hot water extraction acceleration test. It is suitable for medical equipment, food containers and the like.
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP90910929A EP0446358B1 (en) | 1989-07-11 | 1990-07-11 | Polypropylene resin composition |
KR1019910700264A KR940004092B1 (ko) | 1989-07-11 | 1990-07-11 | 폴리프로필렌수지 조성물 |
DE69023117T DE69023117T2 (de) | 1989-07-11 | 1990-07-11 | Polypropylenharzzusammensetzung. |
US08/024,858 US5328950A (en) | 1989-07-11 | 1993-02-26 | Polypropylene resin compositions |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1/177024 | 1989-07-11 | ||
JP1177024A JPH0343437A (ja) | 1989-07-11 | 1989-07-11 | ポリプロピレン樹脂組成物 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991000891A1 true WO1991000891A1 (fr) | 1991-01-24 |
Family
ID=16023825
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1990/000891 WO1991000891A1 (fr) | 1989-07-11 | 1990-07-11 | Composition de resine de polypropylene |
Country Status (7)
Country | Link |
---|---|
US (1) | US5328950A (ja) |
EP (1) | EP0446358B1 (ja) |
JP (1) | JPH0343437A (ja) |
KR (1) | KR940004092B1 (ja) |
CA (1) | CA2035035A1 (ja) |
DE (1) | DE69023117T2 (ja) |
WO (1) | WO1991000891A1 (ja) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3195434B2 (ja) * | 1991-09-10 | 2001-08-06 | 第一製薬株式会社 | 薬液充填シリンジ製剤 |
JP3046428B2 (ja) * | 1991-12-05 | 2000-05-29 | 旭電化工業株式会社 | 結晶性合成樹脂組成物 |
AU661422B1 (en) * | 1994-02-01 | 1995-07-20 | Daiichi Sankyo Company, Limited | Medicated syringe preparation |
JPH0959453A (ja) * | 1995-08-23 | 1997-03-04 | Tonen Chem Corp | ポリプロピレン樹脂組成物 |
JPH0959458A (ja) * | 1995-08-23 | 1997-03-04 | Tonen Chem Corp | プロピレン/エチレンランダム共重合体樹脂組成物 |
US5889094A (en) * | 1995-08-23 | 1999-03-30 | Tonen Chemical Corporation | Resin composition of propylene-ethylene random copolymer |
US5834541A (en) * | 1997-05-02 | 1998-11-10 | Montell North America Inc. | Olefin polymer composition having low smoke generation and fiber and film prepared therefrom |
DE19801050A1 (de) * | 1998-01-14 | 1999-07-15 | Bayer Ag | Polycarbonat-ABS-Formmassen |
KR101588343B1 (ko) | 2008-08-28 | 2016-01-25 | 가부시키가이샤 아데카 | 폴리올레핀계 수지 조성물 |
EP3118253A4 (en) * | 2014-03-10 | 2017-11-22 | Prime Polymer Co., Ltd. | Propylene resin composition and stretched container made from same |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5285243A (en) * | 1976-01-09 | 1977-07-15 | Hitachi Ltd | Polypropylene resin composition |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS581736A (ja) * | 1981-06-25 | 1983-01-07 | Adeka Argus Chem Co Ltd | ポリオレフイン系樹脂組成物 |
DE3322938A1 (de) * | 1983-06-25 | 1985-01-10 | Basf Ag, 6700 Ludwigshafen | Verfahren zum herstellen von anwendungstechnisch besonders gut geeigneten homo- und copolymerisaten des propylens |
JPS60182952A (ja) * | 1984-02-29 | 1985-09-18 | 大日本印刷株式会社 | 放射線殺菌包装用フイルム |
JPS6153344A (ja) * | 1984-08-22 | 1986-03-17 | Adeka Argus Chem Co Ltd | 耐放射線性ポリオレフイン組成物 |
JPS6369854A (ja) * | 1986-09-11 | 1988-03-29 | Sakai Chem Ind Co Ltd | 塩素含有樹脂組成物 |
JPS6369853A (ja) * | 1986-09-12 | 1988-03-29 | Mitsubishi Petrochem Co Ltd | プロピレン重合体組成物 |
JPS63210152A (ja) * | 1987-02-26 | 1988-08-31 | Chisso Corp | 高剛性高溶融粘弾性プロピレン単独重合体組成物 |
US4820772A (en) * | 1987-04-20 | 1989-04-11 | Chisso Corporation | Polyolefin composition |
-
1989
- 1989-07-11 JP JP1177024A patent/JPH0343437A/ja active Pending
-
1990
- 1990-07-11 WO PCT/JP1990/000891 patent/WO1991000891A1/ja active IP Right Grant
- 1990-07-11 EP EP90910929A patent/EP0446358B1/en not_active Expired - Lifetime
- 1990-07-11 KR KR1019910700264A patent/KR940004092B1/ko not_active IP Right Cessation
- 1990-07-11 DE DE69023117T patent/DE69023117T2/de not_active Expired - Fee Related
- 1990-07-11 CA CA002035035A patent/CA2035035A1/en not_active Abandoned
-
1993
- 1993-02-26 US US08/024,858 patent/US5328950A/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5285243A (en) * | 1976-01-09 | 1977-07-15 | Hitachi Ltd | Polypropylene resin composition |
Also Published As
Publication number | Publication date |
---|---|
US5328950A (en) | 1994-07-12 |
CA2035035A1 (en) | 1991-01-12 |
KR940004092B1 (ko) | 1994-05-13 |
KR920701342A (ko) | 1992-08-11 |
DE69023117T2 (de) | 1996-06-20 |
EP0446358B1 (en) | 1995-10-18 |
DE69023117D1 (de) | 1995-11-23 |
JPH0343437A (ja) | 1991-02-25 |
EP0446358A1 (en) | 1991-09-18 |
EP0446358A4 (en) | 1992-06-17 |
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