Hyperbranched polyesters
AssigneeE. I. Du Pont de Nemours and Company
InventorGarret D. Figuly
Life of this patent
Estimating the term…
Abstract
This invention relates to hyperbranched, functional polyesters prepared by self-condensation of AB.sub.n -type monomers wherein n is at least 2 and wherein B moieties contain a terminal carboxylic acid group or derivative thereof, wherein A or B is carboxyl or hydroxyl-terminated moiety which is an aromatic or aliphatic amino. The polyesters have utility as rheology modifiers or drug delivery vehicles.
Claims26
A soluble hyperbranched polyester having at least 1 branch per 10 monomer units prepared by conventional polycondensation of one or more monomers of the formula:
- XR.sup.2 [(R.sup.1).sub.m Y].sub.n
- wherein:
- R.sup.1 is a divalent C.sub.1-12 hydrocarbyl radical which is linear or branched aliphatic, alicyclic, aromatic or mixed aromatic-aliphatic;
- R.sup.2 is a C.sub.1-12 hydrocarbyl radical having a valence of (n+1), which radical is linear or branched aliphatic, alicyclic, aromatic or mixed aromatic-aliphatic, or R.sup.2 is R.sup.3 N wherein R.sup.3 is defined as for R.sup.1 ;
- either of R.sup.1, R.sup.2 or R.sup.3 optionally also containing substituents that are unreactive under processing conditions;
- X and Y are terminal functions selected from --CO.sub.2 R' and --OR" wherein R' is H or C.sub.1-12 alkyl and R" is H or OC(O)R;
- m is 0 or 1;
- and
- n is an integer and is at least 2;
- with the provisos that:
- (i) both X and Y are not --CO.sub.2 R' or --OR";
- (ii) no X or Y function is adjacent to another X or Y function;
- (iii) when R.sup.2 is an aliphatic hydrocarbyl radical, Y is --CO.sub.2 R';
- and
- (iv) when R.sup.2 is R.sup.3 N, m is 1.
The polyester of claims, 8, 10 or 12 wherein the aromatic portion of R.sup.2 contains at least one substituent that is inert under processing conditions.
A copolymer consisting essentially of repeat units of one or more soluble hyperbranched polyesters having at least 1 branch per 10 monomer units prepared by conventional polycondensation of one or more monomers of the formula
- XR.sup.2 [(R.sup.1).sub.m Y].sub.n
- wherein:
- R.sup.1 is a divalent C.sub.1-12 hydrocarbyl radical which is linear or branched aliphatic, alicyclic, aromatic or mixed aromatic-aliphatic;
- R.sup.2 is a C.sub.1-12 hydrocarbyl radical having a valence of (n+1), which radical is linear or branched aliphatic;
- either of R.sup.1 or R.sup.2 optionally also containing substituents that are unreactive under processing conditions;
- X is CO.sub.2 R',
- Y is OR", wherein R' is H or C.sub.1-12 alkyl and R" is H or OC(O)R';
- m is 0 or 1;
- and
- n is an integer and is at least 2;
- with the proviso that no X or Y function is adjacent to another X or Y function, and repeat units of a comonomer selected from a polymerizable diol or dicarboxylic acid.
Dependencies are inferred from the claim text.