Appeal No. 97-1922
Application No. 08/356,573
1. A method for preparing a biaxially oriented polyester
sheet or web, with improved antistatic properties, comprising
the steps of
(i) stretching said polyester sheet or web first in one
direction and second in a direction perpendicular thereto
(ii) coating said hydrophobic polyester sheet or web,
either before stretching or between said first and second
stretching operation, on one or both sides, with a transparent
antistatic primer layer, wherein the coating composition of
said transparent antistatic primer layer comprises (1) a
dispersion of a polythiophene with conjugated polymer backbone
and a polymeric polyanion compound and (2) a latex polymer
having hydrophilic functionality.
The examiner relies upon the following references as
evidence of obviousness:
Tanabe et al. (Tanabe) 3,683,060 Aug. 8,
1972
Jonas et al. (Jonas) 5,300,575 Apr. 5,
1994
(filed Dec. 10, 1992)
Appellants’ claimed invention is directed to a method for
preparing a biaxially oriented polyester sheet wherein a
transparent antistatic primer layer is coated on the sheet
either before stretching or between the first and second
stretching operations. The primer layer comprises a
dispersion of a polythiophene with conjugated polymer backbone
and a polymeric polyanion compound, along with a latex polymer
having hydrophilic functionality. According to the
2
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