Branched polypropylene
OwnerAbbas Razaviinventor
Life of this patent
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Abstract
Provided is a method for the production of a polypropylene comprising branches in the polymer backbone, which method comprises: (a) forming macromers from an olefin monomer; and (b) polymerising propylene in the presence of the macromers and a catalyst, under polymerising conditions which favour the incorporation of the macromers into the polypropylene backbone, to form a branched polypropylene; wherein the catalyst employed in step (a) comprises a metallocene catalyst which promotes a chain terminating Palkyl elimination reaction to form terminal unsaturated groups in the macromers.
Claims25
1-25. (canceled)
A method for the production of a polypropylene comprising branches in the polymer backbone, comprising:
- (a) forming macromers from an olefin monomer in the presence of a metallocene catalyst which promotes a chain terminating β-alkyl elimination reaction to form terminal unsaturated groups in the macromers and is characterized by the formula:
- (Ind—Rm)2R″MQ2 (I)
- wherein:
- Ind is an indenyl group or a tetrahydroindenyl group;
- each R is the same or different and is a hydrocarbyl group having from 1-20 carbon atoms;
- m is an integer from 0-6;
- R″ is a structural bridge imparting stereorigidity to the catalyst and containing at most one carbon atom;
- M is a metal atom from Group IVB or is vanadium;
- and
- each Q is a hydrocarbon having from 1-20 carbon atoms or is a halogen;
- or by the formula:
- R″(CpRk)2MQ2 (II)
- wherein:
- Cp is a cyclopentadienyl ring;
- R″ is a structural bridge imparting stereorigidity to the catalyst and contains no more than one carbon atom;
- each R is the same or different and is a hydrocarbyl group having from 1-20 carbon atoms;
- k is an integer of from 1-4;
- M is a metal atom from Group IVB or is vanadium;
- and
- each Q is a hydrocarbon having from 1-20 carbon atoms or is a halogen;
- and
- (b) polymerizing propylene in the presence of the macromers and a catalyst under polymerizing conditions which favor the incorporation of the macromers into the polypropylene backbone to form a branched polypropylene.
A branched polypropylene having branches in the polymer backbone produced by the process of:
- (a) forming macromers from an olefin monomer in the presence of a metallocene catalyst which promotes a chain terminating β-alkyl elimination reaction to form terminal unsaturated groups in the macromers and is characterized by the formula:
- (Ind—Rm)2R″MQ2 (I)
- wherein:
- Ind is an indenyl group or a tetrahydroindenyl group;
- each R is the same or different and is a hydrocarbyl group having from 1-20 carbon atoms;
- m is an integer from 0-6;
- R″ is a structural bridge imparting stereorigidity to the catalyst and containing at most one carbon atom;
- M is a metal atom from Group IVB or is vanadium;
- and
- each Q is a hydrocarbon having from 1-20 carbon atoms or is a halogen;
- or by the formula:
- R″(CpRk)2MQ2 (II)
- wherein:
- Cp is a cyclopentadienyl ring;
- R″ is a structural bridge imparting stereorigidity to the catalyst and contains no more than one carbon atom;
- each R is the same or different and is a hydrocarbyl group having from 1-20 carbon atoms;
- k is an integer of from 1-4;
- M is a metal atom from Group IVB or is vanadium;
- and
- each Q is a hydrocarbon having from 1-20 carbon atoms or is a halogen;
- and
- (b) polymerizing propylene in the presence of the macromers and a catalyst under polymerizing conditions which favor the incorporation of the macromers into the polypropylene backbone to form a branched polypropylene.
Dependencies are inferred from the claim text.