W.R. Grace a natural buyer of Dow polypropylene assets, says Piper Jaffray After visiting W.R. Grace's (GRA) headquarters, Piper Jaffray raised its price target for shares to $95 from $90 and keeps an Overweight rating on the stock. Piper views Grace as a natural buyer of the Dow Chemical (DOW) polypropylene catalyst assets that are coming on the market over the next 4-6 weeks.