Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1997-03-11
1999-10-19
Mullis, Jeffrey C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525323, 526351, C08F 1006, C08F 460, C08F29706, C08L 2314
Patent
active
059690496
ABSTRACT:
A process for preparing a propylene polymer composition having excellent rigidity, heat resistance and impact resistance, the process comprising conducting multistage polymerization including a step (a) for preparing a propylene (co)polymer (a), a step (b) for preparing a propylene-olefin copolymer (b) and a step (c) for preparing an ethylene-olefin copolymer (c) in the presence of (A) a transition metal compound and (B) a compound activating the transition metal compound (A), in which the steps (a), (b) and (c) may be carried out in any order, each of the second and subsequent stage polymerizations is carried out in the presence of a polymer or polymers obtained by the preceding stage or stages, respectively, and the resulting propylene polymer composition contains the propylene (co)polymer (a) in an amount of 20 to 90% by weight, the propylene-olefin copolymer (b) in an amount of 5 to 75% by weight and the ethylene-olefin copolymer (c) in an amount of 5 to 75% by weight, and has MFR, as measured at 230.degree. C. under a load of 2.16 kg, of 0.01 to 500 g/10 min.
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English Language Abstract of Japanese Laid-Open Patent Publication No. 4-337308.
Fukuoka Daisuke
Hashimoto Mikio
Imuta Jun-ichi
Kawasaki Masaaki
Ueda Takashi
Mitsui Chemicals Inc.
Mullis Jeffrey C.
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