Modified polyester polyblends and preparation thereof
AssigneeMonsanto Company
InventorJohn William Hirzy
Life of this patent
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Abstract
Polyblends are disclosed comprising terminated polyesters, coupled polyesters derived from partially terminated polyesters and coupled polyesters derived from non-terminated polyesters. The polyblends are prepared by reacting a dicarboxylic acid, a glycol and a monocarboxylic acid or monohydric alcohol under esterification conditions and subsequently treating the reaction mixture with a polyfunctional coupling agent. The polyblends are useful as plasticizers for film-forming vinyl halide polymers.
Claims31
Polyblend comprising (a) an alcohol terminated polyester, (b) a coupled polyester derived from a partially alcohol terminated polyester, and (c) a coupled polyester derived from a non-terminated polyester, said polyblend having a molecular weight below about 12,000 and containing from about 10 percent to about 40 percent (b) and (c) combined.
Polyblend comprising
- a. a polyester of the formula
- T--A--G--A--.sub.x T,
- b. a polyester of the formula
- T--A--G--A--.sub.x G--Z--G--A--G--.sub.x A--T
- and
- c. a polyester of the formula
- [(G--A--.sub.x G--Z].sub.y
- wherein
- T represents the residue of a monohydric alcohol;
- G represents the residue of a glycol;
- A represents the residue of a dicarboxylic acid;
- Z represents the residue of a coupling agent;
- x represents an integer having a value of from 5 to 15;
- and
- y represents an integer having a value of from 1 to about 12.
Dependencies are inferred from the claim text.