Process for preparing thermoplastic elastomers
AssigneeMitsui Petrochemical Industries, Ltd.
InventorsKazuhiko Murata, Shizuo Shimizu, Mamoru Kioka, Akinori Toyota
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Abstract
Proposed herein is a process for preparing thermoplastic elastomers, which comprises dynamically heat treating polymer particles together with a crosslinking agent, each of the polymer particles being composed of a portion comprising a crystalline olefin polymer and portions comprising an amorphous olefin polymer, the polymer particles having an average particle diameter of at least 10 .mu.m and an apparent bulk density of at least 0.2 g/ml.
Claims13
A process for preparing partially or fully crosslinked thermoplastic elastomers, which comprises dynamically heat treating polymer particles together with a crosslinking agent,
- each of said polymer particles is composed of from 80 to 20 parts by weight of a crystalline portion comprising a crystalline propylene polymer and from 20 to 80 parts by weight of an amorphous portion comprising an amorphous ethylene-.alpha.-olefin copolymer, wherein said polymer particles composed of a crystalline portion and an amorphous portion have a sea-and-islands structure in which said islands comprise said amorphous portion and said islands have an average particle diameter not exceeding 0.5 .mu.m,
- said polymer particles having an average particle diameter of from 10 to 5000 .mu.m and an apparent bulk density of at least 0.2 g/ml,
- each of said polymer particles is obtained from a polymerization process comprising at least two steps in series to form said amorphous and crystalline portions in the polymer particles.
A process for preparing partially or fully crosslinked thermoplastic elastomers, which comprises dynamically heat treating polymer particles together with a crosslinking agent and a crosslinking auxiliary,
- each of said polymer particles is composed of from 80 to 20 parts by weight of a crystalline portion comprising a crystalline propylene polymer and from 20 to 80 parts by weight of an amorphous portion comprising an amorphous ethylene-.alpha.-olefin copolymer, wherein said polymer particles composed of a crystalline portion and an amorphous portion have a sea-and-islands structure in which said islands comprise said amorphous portion and said islands have an average particle diameter not exceeding 0.5 .mu.m,
- said polymer particles having an average particle diameter of from 10 to 5000 .mu.m and an apparent bulk density of at least 0.2 g/ml,
- each of said polymer particles is obtained from a polymerization process comprising at least two steps in series to form said amorphous and crystalline portions in the polymer particles.
A process for preparing partially or fully crosslinked thermoplastic elastomers, which comprises dynamically heat treating polymer particles together with a crosslinking agent and a mineral oil softening agent,
- each of said polymer particles is composed of from 80 to 20 parts by weight of a crystalline portion comprising a crystalline propylene polymer and from 20 to 80 parts by weight of an amorphous portion comprising an amorphous ethylene-.alpha.-olefin copolymer, wherein said polymer particles composed of a crystalline portion and an amorphous portion have a sea-and-islands structure in which said islands comprise said amorphous portion and said islands have an average particle diameter not exceeding 0.5 .mu.m,
- said polymer particles having an average particle diameter of from 10 to 5000 .mu.m and an apparent bulk density of at least 0.2 g/ml,
- each of said polymer particles is obtained from a polymerization process comprising at least two steps in series to form said amorphous and crystalline portions in the polymer particles.
A process for preparing partially or fully crosslinked thermoplastic elastomers, which comprises dynamically heat treating polymer particles together with a crosslinking agent, a crosslinking auxiliary and a mineral oil softening agent,
- each of said polymer particles is composed of from 80 to 20 parts by weight of a crystalline portion comprising a crystalline propylene olefin polymer and from 20 to 80 parts by weight of an amorphous portion comprising an amorphous ethylene-.alpha.-olefin copolymer, wherein said polymer particles composed of a crystalline portion and an amorphous portion have a sea-and-islands structure in which said islands comprise said amorphous portion and said islands have an average particle diameter not exceeding 0.5 .mu.m,
- said polymer particles having an average particle diameter of from 10 to 5000 .mu.m and an apparent bulk density of at least 0.2 g/ml,
- each of said polymer particles is obtained from a polymerization process comprising at least two steps in series to form amorphous and crystalline portions in the polymer particles.
Dependencies are inferred from the claim text.