Catalytic systems
AssigneeCyclics Corporation
InventorsYi-Feng Wang, Peter D. Phelps
Life of this patent
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Abstract
This invention relates to single-component and multi-component catalytic systems using aryl titanates. Aryl titanate compounds are useful as catalysts and co-catalysts in single-component and multi-component catalytic systems (e.g., for the polymerization of macrocyclic oligoesters and the depolymerization of polyesters). Multi-component catalytic systems using aryl titanates allow increased versatility in applications such as liquid molding.
Claims68
A catalytic system comprising:
- (a) a first component comprising a Ti-containing compound;
- and
- (b) a second component comprising at least one of an alcohol and an epoxide, the catalytic system demonstrating increased catalytic activity, upon contact of the first component and the second component, compared to each of the first component and the second component, individually.
A method for polymerizing a macrocyclic oligoester comprising a structural repeat unit of the formula
- 24
- where A is an alkylene, a cycloalkylene, or a mono- or polyoxyalkylene group;
- and B is a divalent aromatic or alicyclic group, the method comprising the steps of
- (a) providing a first compound;
- (b) providing a second compound;
- and
- (c) contacting the first compound, the second compound, and a macrocyclic oligoester to polymerize the macrocyclic oligoester, wherein the first compound and the second compound define at least part of a catalytic system, and wherein the catalytic system demonstrates increased catalytic activity upon contact of the first compound and the second compound, compared to the first compound and the second compound individually.
A method for making a co-polyester, the method comprising the steps of:
- (a) providing a metal-containing compound;
- (b) providing a diol having a molecular formula
- R(OH)2;
- and
- (c) contacting the metal-containing compound and the diol in the presence of macrocyclic oligoester thereby producing a co-polyester comprising a structural unit of R, the macrocyclic oligoester comprising a structural repeat unit of the formula
- 27
- where A is an alkylene, a cycloalkylene, or a mono- or polyoxyalkylene group;
- B is a divalent aromatic or alicyclic group;
- and R is an organic group.
A method for depolymerizing a polyester, the method comprising the steps of:
- (a) providing a polyester;
- (b) providing a depolymerization catalyst comprising a compound having the molecular formula
- Ti—(X—Ar)4,
- wherein each X independently is O, S, or N, and each Ar group independently is an organic group and comprises, or two or more Ar groups taken together form an organic group which comprises, an aromatic group;
- and
- (c) contacting the polyester with the depolymerization catalyst in the presence of a solvent, thereby depolymerizing the polyester.
A method for polymerizing a macrocyclic oligoester, the method comprising the steps of:
- (a) providing a macrocyclic oligoester comprising a structural repeat unit of the formula
- 30
- where A is an alkylene, a cycloalkylene, or a mono- or polyoxyalkylene group;
- and B is a divalent aromatic or alicyclic group;
- (b) providing a polymerization catalyst comprising a compound having the molecular formula
- Ti—(X—Ar)4,
- wherein each X independently is O, S, or N, and each Ar group independently is an organic group and comprises, or two or more Ar groups taken together form an organic group which comprises, an aromatic group;
- and
- (c) contacting the macrocyclic oligoester with the polymerization catalyst, thereby polymerizing the macrocyclic oligoester.
A catalyst comprising a Ti-containing compound having the molecular formula
- Ti—(X—Ar)4,
- wherein each X independently is O, S, or N, and each Ar group independently is an organic group and comprises, or two or more Ar groups taken together form an organic group which comprises, an aromatic group directly bonded to at least one X, wherein each aromatic group independently is substituted with a bulky group at at least one ortho-position, is directly bonded to at least two X's, or both.
A composition comprising:
- (a) a macrocyclic oligoester comprising a structural repeat unit of the formula
- 33
- where A is an alkylene, a cycloalkylene, or a mono- or polyoxyalkylene group;
- and B is a divalent aromatic or alicyclic group;
- and
- (b) a compound having the molecular formula
- Ti—(X—Ar)4,
- wherein each X independently is O, S, or N, and each Ar group independently is an organic group and comprises, or two or more Ar groups taken together form an organic group which comprises, an aromatic group.
A catalyst comprising a compound having the molecular formula
- (R—Y1—)i—M[Parenopenst]Y2—Ar)j,
- wherein:
- each of i and j is an integer;
- i≧0;
- j≧1;
- i+j=4 or 6;
- each Y1 independently is a single bond, a —O—(CH2)x— group where x is 1, 2, or 3, or a heteroatom selected from the group consisting of O, S, and N;
- each Y2 independently is O, S, or N;
- each R independently is, or two or more R groups taken together are, an alkyl group or an alkyl ether group;
- each Ar group independently is an organic group and comprises, or two or more Ar groups taken together form an organic group which comprises, an aromatic group directly bonded to at least one Y2, wherein each aromatic group independently is substituted with a bulky group at at least one ortho-position;
- and
- M is Ti or Sn.
Dependencies are inferred from the claim text.