Back to results
US 5,208,304 AGranted
Stereoregular cyclopolymers and method
AssigneeThe Board of Trustees of the Leland Stanford Junior University
InventorRobert M. Waymouth
Life of this patent
Estimating the term…
Abstract
Homogeneous catalyst systems are provided for cyclopolymerization of diolefins, particularly 1,5-hexadiene, which control the stereochemistry, microstructure, and physical properties of the polymers synthesized. The systems comprise homogeneous Ziegler-Natta catalysts based on group 4 metallocenes and methylalumoxane. The cyclopolymers synthesized exhibit different degrees of stereoregularity, which is a function of the polymerization conditions. In addition, the polyolefins can be chiral and optically active. The polymers produced are of high molecular weight and highly flexible.
Claims12
A method of preparing polymers formed of monomer moieties, substantially each monomer having the following structural formula:
- ##STR6## where C.sub.1,C.sub.2, and C.sub.3 designate respectively the first, second, and third carbon in the ring of each monomer, where n is an integer from 0 to about 3 and m is a positive number up to about 10,000, comprising the step of:
- (a) providing nonconjugated diolefins having the following structural formula:
- ##STR7## where n is an integer between about 0 and 3 and R.sub.1 and R.sub.2 are hydrogens or hydrocarbyl substituents between 1 and 20 carbons in length, including cyclic structures where R.sub.1 is connected to R.sub.2 by a chain of atoms;
- and
- (b) adding a soluble catalyst system to the diolefins, said catalyst system consists essentially of (i) an achiral metallocene derivative (C.sub.5 R'.sub.5).sub.2 MX.sub.2, where (C.sub.5 R'.sub.5) is a substituted or nonsubstituted cyclopentadienyl ligand, R' is a hydrogen or hydrocarbyl substituent, M is Zr, Hf, or Ti, and X is any uninegative ligand including a halide, hydrocarbyl, alkoxide or amide and (ii) an aluminum compound wherein the polymers synthesized are predominately atactic.
2 more elements
A method of preparing polymers formed of monomer moieties, substantially each monomer having the following structural formula:
- ##STR8## where C.sub.1,C.sub.2, and C.sub.3 designate respectively the first, second, and third carbon int he ring of each monomer, where n is an integer from 0 to about 3 and m is a positive number up to about 10,000, comprising the step of:
- (a) providing nonconjugated diolefins having the following structural formula:
- ##STR9## where n is an integer between about 0 and 3 and R.sub.1 and R.sub.2 are hydrogens or hydrocarbyl substituents between 1 and 20 carbons in length, including cyclic structures where R.sub.1 is connected to R.sub.2 by a chain of atoms;
- and
- (b) adding a soluble catalyst system to the diolefins, said catalyst system consists essentially of (i) an achiral metallocene derivative (C.sub.5 R'.sub.5).sub.2 MX.sub.2, where (C.sub.5 R'.sub.5) is a substituted or nonsubstituted cyclopentadienyl ligand, R' is a hydrogen or hydrocarbyl substituent, M is Zr, Hf, or Ti, and X is any uninegative ligand including a halide, hydrocarbyl, alkoxide or amide and (ii) an aluminum compound;
- and
- (c) controlling the temperature of the diolefins and catalyst system to regulate the trans selectivity in the cyclopolymerization.
4 more elements
A method of preparing polymers formed of monomer moieties, substantially each monomer having the following structural formula:
- ##STR10## where C.sub.1,C.sub.2, and C.sub.3 designate respectively the first, second, and third carbon int he ring of each monomer, where n is an integer from 0 to about 3 and m is a positive number up to about 10,000, comprising the step of:
- (a) providing nonconjugated diolefins having the following structural formula:
- ##STR11## where n is an integer between about 0 and 3 and R.sub.1 and R.sub.2 are hydrogens or hydrocarbyl substituents between 1 and 20 carbons in length, including cyclic structures where R.sub.1 is connected to R.sub.2 by a chain of atoms;
- and
- (b) adding a soluble catalyst system to the diolefins, said catalyst system consists essentially of (i) an achiral metallocene derivative (C.sub.5 R'.sub.5).sub.2 MX.sub.2, where (C.sub.5 R'.sub.5) is a substituted or nonsubstituted cyclopentadienyl ligand, R' is a hydrogen or hydrocarbyl substituent, M is Zr, Hf, or Ti, and X is any uninegative ligand including a halide, hydrocarbyl, alkoxide or amide and (ii) an aluminum compound wherein the polymers synthesized are predominately isotactic.
2 more elements
A method of preparing polymers formed of monomer moieties, substantially each monomer having the following structural formula:
- ##STR12## where C.sub.1,C.sub.2, and C.sub.3 designate respectively the first, second, and third carbon int he ring of each monomer, where n is an integer from 0 to about 3 and m is a positive number up to about 10,000, comprising the step of:
- (a) providing nonconjugated diolefins having the following structural formula:
- ##STR13## where n is an integer between about 0 and 3 and R.sub.1 and R.sub.2 are hydrogens or hydrocarbyl substituents between 1 and 20 carbons in length, including cyclic structures where R.sub.1 is connected to R.sub.2 by a chain of atoms;
- and
- (b) adding a soluble catalyst system to the diolefins, said catalyst system consists essentially of (i) an achiral metallocene derivative (C.sub.5 R'.sub.5).sub.2 MX.sub.2, where (C.sub.5 R'.sub.5) is a substituted or nonsubstituted cyclopentadienyl ligand, R' is a hydrogen or hydrocarbyl substituent, M is Zr, Hf, or Ti, and X is any uninegative ligand including a halide, hydrocarbyl, alkoxide or amide and (ii) an aluminum compound wherein the substituents of C.sub.1 and C.sub.3 of the monomers in the polymers synthesized are predominately in the trans position.
2 more elements
A method of preparing polymers formed of monomer moieties, substantially each monomer having the following structural formula:
- ##STR14## where C.sub.1,C.sub.2, and C.sub.3 designate respectively the first, second, and third carbon in the ring of each monomer, where n is an integer from 0 to about 3 and m is a positive number up to about 10,000, comprising the step of:
- (a) providing nonconjugated diolefins having the following structural formula:
- ##STR15## where n is an integer between about 0 and 3 and R.sub.1 and R.sub.2 are hydrogens or hydrocarbyl substituents between 1 and 20 carbons in length, including cyclic structures where R.sub.1 is connected to R.sub.2 by a chain of atoms;
- and
- (b) adding a soluble catalyst system to the diolefins, said catalyst system consists essentially of (i) a chiral stereorigid metallocene described by the formula:
- R"(C.sub.5 (R').sub.4).sub.2 MX.sub.2
- wherein (C.sub.5 (R').sub.4) is a cyclopentadienyl or substituted cyclopentadienyl ring, including indenyl and tetrahydroindenyl rings;
- each R' is a hydrogen or hydrocarbyl radical having from 1 to 20 carbon atoms;
- R" is an organic or inorganic group providing a structural bridge between the two (C.sub.5 (R').sub.4) rings imparting stereorigidity to the said catalyst;
- M is Zr, Hf, or Ti;
- and X is any uni-negative ligand including a halide, hydrocarbyl, alkoxide or amide and (ii) an aluminum compound wherein the polymers synthesized are predominately atactic.
8 more elements
A method of preparing polymers formed of monomer moieties, substantially each monomer having the following structural formula:
- ##STR16## where C.sub.1,C.sub.2, and C.sub.3 designate respectively the first, second, and third carbon int he ring of each monomer, where n is an integer from 0 to about 3 and m is a positive number up to about 10,000, comprising the step of:
- (a) providing nonconjugated diolefins having the following structural formula:
- ##STR17## where n is an integer between about 0 and 3 and R.sub.1 and R.sub.2 are hydrogens or hydrocarbyl substituents between 1 and 20 carbons in length, including cyclic structures where R.sub.1 is connected to R.sub.2 by a chain of atoms;
- (b) adding a soluble catalyst system to the diolefins, said catalyst system consists essentially of (i) a chiral stereorigid metallocene described by the formula:
- R"(C.sub.5 (R').sub.4).sub.2 MX.sub.2
- wherein (C.sub.5 (R').sub.4) is a cyclopentadienyl or substituted cyclopentadienyl ring, including indenyl and tetrahydroindenyl rings;
- each R' is a hydrogen or hydrocarbyl radical having from 1 to 20 carbon atoms;
- R" is an organic or inorganic group providing a structural bridge between the two (C.sub.5 (R').sub.4) rings imparting stereorigidity to the said catalyst;
- M is Zr, Hf, or Ti;
- and X is any uni-negative ligand including a halide, hydrocarbyl, alkoxide or amide and (ii) an aluminum compound;
- and
- (c) controlling the temperature of the diolefins and catalyst system to regulate the trans selectivity in the cyclopolymerization.
9 more elements
A method of preparing polymers formed of monomer moieties, substantially each monomer having the following structural formula:
- ##STR18## where C.sub.1,C.sub.2, and C.sub.3 designate respectively the first, second, and third carbon int he ring of each monomer, where n is an integer from 0 to about 3 and m is a positive number up to about 10,000, comprising the step of:
- (a) providing nonconjugated diolefins having the following structural formula:
- ##STR19## where n is an integer between about 0 and 3 and R.sub.1 and R.sub.2 are hydrogens or hydrocarbyl substituents between 1 and 20 carbons in length, including cyclic structures where R.sub.1 is connected to R.sub.2 by a chain of atoms;
- and
- (b) adding a soluble catalyst system to the diolefins, said catalyst system consists essentially of (i) a chiral stereorigid metallocene described by the formula:
- R"(C.sub.5 (R').sub.4).sub.2 MX.sub.2
- wherein (C.sub.5 (R').sub.4) is a cyclopentadienyl or substituted cyclopentadienyl ring, including indenyl and tetrahydroindenyl rings;
- each R' is a hydrogen or hydrocarbyl radical having from 1 to 20 carbon atoms;
- R" is an organic or inorganic group providing a structural bridge between the two (C.sub.5 (R').sub.4) rings imparting stereorigidity to the said catalyst;
- M is Zr, Hf, or Ti;
- and X is any uni-negative ligand including a halide, hydrocarbyl, alkoxide or amide and (ii) an aluminum compound wherein the polymers synthesized are predominately isotactic.
8 more elements
A method of preparing polymers formed of monomer moieties, substantially each monomer having the following structural formula:
- ##STR20## where C.sub.1,C.sub.2, and C.sub.3 designate respectively the first, second, and third carbon int he ring of each monomer, where n is an integer from 0 to about 3 and m is a positive number up to about 10,000, comprising the step of:
- (a) providing nonconjugated diolefins having the following structural formula:
- ##STR21## where n is an integer between about 0 and 3 and R.sub.1 and R.sub.2 are hydrogens or hydrocarbyl substituents between 1 and 20 carbons in length, including cyclic structures where R.sub.1 is connected to R.sub.2 by a chain of atoms;
- and
- (b) adding a soluble catalyst system to the diolefins, said catalyst system consists essentially of (i) a chiral stereorigid metallocene described by the formula:
- R"(C.sub.5 (R').sub.4).sub.2 MX.sub.2
- wherein (C.sub.5 (R').sub.4) is a cyclopentadienyl or substituted cyclopentadienyl ring, including indenyl and tetrahydroindenyl rings;
- each R' is a hydrogen or hydrocarbyl radical having from 1 to 20 carbon atoms;
- R" is an organic or inorganic group providing a structural bridge between the two (C.sub.5 (R').sub.4) rings imparting stereorigidity to the said catalyst;
- M is Zr, Hf, or Ti;
- and X is any uni-negative ligand including a halide, hydrocarbyl, alkoxide or amide and (ii) an aluminum compound wherein the substituents of C.sub.1 and C.sub.3 of the monomers in the polymers synthesized are predominately in the trans position.
8 more elements
Dependencies are inferred from the claim text.