Dow Chemical Technologies LLC

Robert A Gunther

James P Maher

Nichole E Nickel

Stephen J Skapik, Iii

Eric K Lee

Donald J Gromacki

The invention includes a composition comprising from 40 to 98 weight percent of at least one GPPS, from 0 to 98 weight percent of at least one HIPS, from 0.5 to 10 weight percent at least one styrene block copolymer, from 0.5 to 10 weight percent of at least one polypropylene wherein the combination of GPPS, HIPS, polypropylene and styrene block copolymer make up at least about 90 percent of the composition as well as a film made of the composition, an envelope window patch comprising the film, an envelope comprising the window patch, and a process for making the film.

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Auburn, MI, United States of America

Robert A Gunther