a mixture of acrylic and non acrylic polymers the finish is applied from about 1 to about 4 wt nominal solids add on of said fabric application_number US 92330104 A description in the simplistic form the present invention concerns a polyester fabric having a finish of acrylic acid ester polymer polyester fibers and fabrics for airbags are well known invista inc formerly kosa sells a low profile fiber that is designated as 650d t771 polyethylene terephthalate pet homopolymer is prepared by one of two processes namely 1 the ester interchange process and 2 the direct esterification process in the ester interchange process dimethyl terephthalate dmt is reacted with ethylene glycol transesterification to yield bis 2 hydroxy ethyl terephthalate monomer along with minor amounts of other reaction products oligomers and methanol because the reaction is reversible it is necessary to remove the methanol to completely convert the raw materials into monomer it is known to use magnesium and or cobalt and or zinc in the ester interchange reaction the catalyst activity is then sequestered by introducing phosphorus for example in the form of polyphosphoric acid ppa at the end of the ester interchange reaction the monomer then under goes a condensation process polycondensation which polymerizes the monomer to pet when the.