Thermoplastic polymer blends of isotactic polypropylene and...

C - Chemistry – Metallurgy – 08 – L

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C08L 23/10 (2006.01) C08L 23/12 (2006.01) C08L 23/14 (2006.01) C08L 23/16 (2006.01) C08L 51/06 (2006.01) C08L 53/00 (2006.01) C08F 210/06 (2006.01) C08L 23/02 (2006.01)

Patent

CA 2296323

Thermoplastic polymer blend compositions comprising an isotactic polypropylene component and an alpha-olefin and propylene copolymer, said copolymer comprising crystallizable alpha-olefin sequences. In a preferred embodiment, improved thermoplastic polymer blends are provided comprising from about 35 % to about 85 % isotactic polypropylene and from about 30 % to about 70 % of an ethylene and propylene copolymer, wherein said copolymer comprises isotactically crystallizable propylene sequences and is predominantly propylene. The resultant blends manifest compatibility characteristics, increased tensile strength, and improved process characteristics, e.g., a single melting point.

L'invention traite de compositions mélanges de polymères thermoplastiques améliorées renfermant un composant polypropylène isotactique et un composant copolymère propylène et alpha-oléfine, ledit copolymère renfermant des séquences alpha-oléfine cristallisables. Selon un mode de réalisation préféré, les mélanges de polymères thermoplastiques améliorés renferment entre environ 35 % et environ 85 % de polypropylène isotactique et entre environ 30 % et environ 70 % de copolymère d'éthylène et propylène, ledit copolymère renfermant des séquences de propylène cristallisables par la voie isotactique et renfermant essentiellement du propylène. Les mélanges résultants présentent des propriétés de compatibilité inattendues, une résistance à la traction améliorée, et des propriétés de procédé améliorées, par exemple, un point de fusion unique.

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