Accession Number:

ADD019761

Title:

Crosslinked Polyesters

Descriptive Note:

Patent Application, Filed 2 Mar 2001

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s):

Report Date:

2001-03-02

Pagination or Media Count:

25.0

Abstract:

According to the present invention, polyesters are formed in aqueous media by the formation of ester linkages via the intermolecular polycondensation between the acid and alcohol moieties of a single monomer. The preferred monomers are derivatives of tartaric acid, which has two carboxylic acid groups and two hydroxyl groups. Using the proper strategy, these groups can be used to propagate a chain reaction that leads to the formation of a desired polymer. The carboxyl groups are protected with an amine, such as dimethylamine, and the hydroxyl groups are O-alkylated with a haloalkanol. The resulting diamide is then hydrolyzed to deprotect the amido groups. Formation of quaternary ammonium intermediates during hydrolysis fosters the reaction of terminal hydroxyl groups to form an ester bond. Because the precursor monomer is bifunctional, possessing both hydroxyl and carboxyl groups, the esterification process propagates to give a highly crosslinked polymer. The haloalkanol which o-alkylates the monomers is chosen to impart the desired properties to the polymer.

Subject Categories:

  • Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE