Heterophasic polymer composition of high stiffness
AssigneeBorealis AG
InventorsBo Malm, Franz Ruemer, Andreas Wolf, Tua Sundholm
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Abstract
The present invention relates to a heterophasic polymer composition which comprises (i) a matrix comprising a propylene homopolymer and/or a propylene copolymer having an amount of comonomer units of less than 1.0 wt %, and (ii) an elastomeric polypropylene which is dispersed within the matrix and comprises comonomer units derived from ethylene and/or a C4 to C12 alpha-olefin; and wherein the heterophasic polymer composition has an amorphous fraction AM in an amount of 2.0 to 7.5 wt %, and the amorphous fraction AM has an amount of ethylene- and/or C4 to C12 alpha-olefin-derived comonomer units of 20 to 45 wt %.
Claims32
A heterophasic polymer composition, comprising
- a matrix comprising a propylene homopolymer and/or a propylene copolymer having an amount of comonomer units of less than 1.0 wt %,
- an elastomeric polypropylene which is dispersed within the matrix and comprises comonomer units derived from ethylene and/or a C4 to C12 alpha-olefin,
- the heterophasic polymer composition having an amorphous fraction AM in an amount of 2.0 to 7.5 wt %, and the amorphous fraction AM having an amount of ethylene- and/or C4 to C12 alpha-olefin-derived comonomer units of 20 to 45 wt %, the heterophasic polymer composition having an amount of ethylene- and/or C4 to C12 alpha-olefin-derived comonomer units of from 0.8 wt % to less than 1.8 wt %.
A heterophasic polymer composition, comprising
- a matrix comprising a propylene homopolymer and/or a propylene copolymer having an amount of comonomer units of less than 1.0 wt %,
- an elastomeric polypropylene which is dispersed within the matrix and comprises comonomer units derived from ethylene and/or a C4 to C12 alpha-olefin,
- the heterophasic polymer composition having a xylene cold soluble fraction XCStotal in an amount of 3.0 to 8.5 wt %, and an amount of ethylene- and/or C4 to C12 alpha-olefin-derived comonomer units of from 0.8 wt % to less than 1.8 wt %.
A pipe, comprising a heterophasic polymer composition comprising
- a matrix comprising a propylene homopolymer and/or a propylene copolymer having an amount of comonomer units of less than 1.0 wt %,
- an elastomeric polypropylene which is dispersed within the matrix and comprises comonomer units derived from ethylene and/or a C4 to C12 alpha-olefin,
- the heterophasic polymer composition having an amorphous fraction AM in an amount of 2.0 to 7.5 wt %, and the amorphous fraction AM having an amount of ethylene- and/or C4 to C12 alpha-olefin-derived comonomer units of 20 to 45 wt %, the heterophasic polymer composition having an amount of ethylene- and/or C4 to C12 alpha-olefin-derived comonomer units of from 0.8 wt % to less than 1.8 wt %.
A process for the preparation of a heterophasic polymer composition, comprising the following steps:
- (i) preparing a propylene homo- or copolymer in at least one loop reactor and optionally in at least one gas phase reactor,
- (ii) transferring the propylene homo- or copolymer to at least one gas phase reactor and preparing an elastomeric polypropylene in the presence of the propylene homo- or copolymer,
- the propylene homo- or copolymer having an amount of comonomer units of less than 1.0 wt %,
- the elastomeric polypropylene having comonomer units derived from ethylene and/or a C4 to C12 alpha-olefin, and
- the heterophasic polymer composition having an amorphous fraction AM in an amount of 2.0 to 7.5 wt %, and the amorphous fraction AM having an amount of ethylene- and/or C4 to C12 alpha-olefin-derived comonomer units of 20 to 45 wt %, the heterophasic polymer composition having an amount of ethylene- and/or C4 to C12 alpha-olefin-derived comonomer units of from 0.8 wt % to less than 1.8 wt %.
Dependencies are inferred from the claim text.