04217441 is referenced by 13 patents and cites 8 patents.

Polyester films are modified by the addition of a high molecular weight polyethylene glycol and an alkali metal salt of a sulfonic acid-substituted dicarboxylic acid ester to the reaction medium during the polymerization process. Films prepared for example, from diesters of terephthalic acid in the presence of the modifiers of this invention exhibit good permeability to water vapor.

Title
Modified polyester films
Application Number
788780
Publication Number
4217441
Application Date
March 29, 1978
Publication Date
August 12, 1980
Inventor
John H Bayless
Hendersonville
NC, US
Assignee
E I Du Pont de Nemours and Company
DE, US
IPC
C08G 63/68
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