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US 7,253,234 B2Granted
Syndiotactic propylene polymer composition
AssigneeMitsui Chemicals, Inc.
InventorsRyoji Mori, Takashi Nakagawa, Akira Todo
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AssigneeMitsui Chemicals, Inc.
InventorsRyoji Mori, Takashi Nakagawa, Akira Todo
Estimating the term…
A syndiotactic propylene-based polymer composition which retains the inherent features of the conventional non-crosslinked or partially crosslinked olefin-based thermoplastic elastomer, and also has excellent abrasion resistance and flexibility. The syndiotactic propylene-based polymer composition comprises 1 to 40 parts by weight of the syndiotactic polypropylene (B), and 5 to 60 parts by weight of the syndiotactic structured propylene-α-olefin copolymer (C) comprising 95 to 65 mol % of a syndiotactic structured propylene component and 5 to 35 mol % of an α-olefin (except propylene) component having 2 to 20 carbon atoms, based on 100 parts by weight of the non-crosslinked or partially crosslinked olefin-based thermoplastic elastomer (A).
A syndiotactic propylene-based polymer composition comprising 100 parts by weight of a partially cross-linked olefin-based thermoplastic elastomer composition (A) comprising a crystalline polyolefin resin (A-1) and an α-olefin-based copolymer rubber (A-2), 1 to 40 parts by weight of a syndiotactic polypropylene (B) based on 100 parts by weight of (A), and 5 to 60 parts by weight of a syndiotactic structured propylene-α-olefin copolymer (C) comprising 95 to 65 mol % of a syndiotactic structured propylene component and 5 to 35 mol % of an α-olefin (except propylene) component having 2 to 20 carbon atoms based on 100 parts by weight (A).
Dependencies are inferred from the claim text.
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Homopolymers or copolymers of propene: polypropene
Copolymers of propene: at least partially crystalline copolymers of propene with other olefins
Not modified by chemical after-treatment: ethylene-propylene or ethylene-propylene-diene copolymers
Polymer mixtures characterised by other features: containing two or more polymers of the same C08L -group
Term ended 17 Feb 2024 (estimated)
The present invention relates to a syndiotactic propylene-based polymer composition, and more specifically to a syndiotactic propylene-based polymer composition having excellent abrasion resistance, flexibility and rubber elasticity.
A crosslinked olefin-based thermoplastic elastomer is an energy and resource saving elastomer, and in particular, has been used for automobile parts, industrial machinery parts, electrical and electronic machinery parts, construction materials and the like as a replacement of a natural rubber.
The crosslinked olefin-based thermoplastic elastomer is widely known as disclosed in detail in the literature [see “A. Y. Coran et al., Rubber Chemistry and Technology,” Vol. 53 (1980), p. 141].
Hereinafter, the syndiotactic propylene-based copolymer composition according to the invention will be specifically described in detail.
For the non-crosslinked or partially crosslinked olefin-based thermoplastic elastomer used in the invention, it preferably comprises polypropylene and an ethylene/α-olefin random copolymer containing non-conjugated diene, but not limited thereto. For example, it may be a non-crosslinked or partially crosslinked olefin-based thermoplastic elastomer which contains polypropylene and an ethylene/α-olefin random copolymer, and as for α-olefin, propylene and butene is preferred.
For the non-crosslinked or partially crosslinked olefin-based thermoplastic elastomer used in the invention, the MFR measured at 230° C. under a load of 10 kg is preferably from 0.001 to 100, and more preferably from 0.01 to 80.