Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1998-09-01
1999-11-16
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C08L 2304
Patent
active
059860081
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to propylene polymer compositions and heat molded products. More particularly, the invention relates to propylene polymer compositions from which heat molded products having good balance between rigidity and impact resistance are obtainable and relates to heat molded products obtainable from the compositions.
BACKGROUND ART
Because of its excellent rigidity, heat resistance and impact resistance, polypropylene is molded by various molding processes and used in many fields. The properties required for the polypropylene differ from each other according to the molding process or the use of the polypropylene. For example, when the polypropylene is used as a material of sewage pipe, potable water pipe or gas pipe, excellent pipe fatigue properties, mechanical strength and moldability are required for the polypropylene. Recently, there has been a growing demand for improvement in rigidity for the purpose of increasing economical efficiency by for example thinning the pipe wall, and there has been a growing demand for improvement in moldability for the purpose of decreasing electric power consumption. When the polypropylene is used as a material of films, impact resistance is required and also transparency is occasionally required for the polypropylene.
The present inventors have studied propylene polymer compositions capable of producing heat molded products, particularly pipes and films, having excellent mechanical strength, and as a result they have found that heat molded products having excellent mechanical strength can be obtained from a composition comprising a propylene polymer of lower density which has a specific melt flow rate and a specific temperature at the maximum peak position of an endothermic curve measured by a differential scanning calorimeter and a propylene polymer of higher density which has a specific melt flow rate and a specific temperature at the maximum peak position of an endothermic curve measured by a differential scanning calorimeter and that pipes and films obtained from the composition particularly have excellent properties. Based on the finding, the present invention has been accomplished.
DISCLOSURE OF THE INVENTION
The propylene polymer composition according to the present invention is a composition comprising: having the following properties: kg, is in the range of 0.001 to 8 g/10 min, said polymer measured by a differential scanning calorimeter (DSC) is in the range of 95 to 145.degree. C., 20 carbon atoms is in the range of 1.5 to 11% by mol; and having the following properties: kg, is in the range of 0.1 to 600 g/10 min, said polymer measured by a differential scanning calorimeter is in the range of 145 to 170.degree. C., 20 carbon atoms is in the range of 0 to 2% by mol; polymer (A) and the melt flow rate (MFR.sub.B (g/10 min)) of the propylene polymer (B) satisfy the following relation density (d.sub.B (kg/m.sup.3)) of the propylene polymer (B) satisfy the following relation
A heat molded product obtained by heat molding the propylene polymer composition has excellent rigidity.
When a pipe is produced from the propylene polymer composition, the composition preferably has the following properties: kg, is in the range of 0.005 to 2.0 g/10 min, said composition measured by a differential scanning calorimeter is in the range of 128 to 157.degree. C., composition at 200.degree. C. is in the range of 800 to 1,900 MPa.
If the propylene polymer composition is heat molded into a pipe, the pipe has excellent rigidity and creep resistance.
When a film is produced from the propylene polymer composition, the composition preferably has the following properties: kg, is in the range of 4 to 25 g/10 min, said composition measured by a differential scanning calorimeter is in the range of 128 to 157.degree. C., composition at 200.degree. C. is in the range of 800 to 1,900 MPa.
If the propylene polymer composition is heat molded into a film, the film has excellent rigidity, transparency and impact resistance.
In the present invention, the
REFERENCES:
patent: 4487871 (1984-12-01), Ishibashi
patent: 5358792 (1994-10-01), Mehta
Ishimoto Akio
Matsumoto Tetsuhiro
Matsunaga Shin-ya
Moriya Satoru
Todo Akira
Michl Paul R.
Mitsui Chemicals Inc.
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