Blowing agent compositions of hydrofluoroolefins and hydrochlorofluoroolefins

Abstract

The present invention relates to blowing agent compositions comprising (1) at least one hydrofluoroolefin (HFO) and (2) at least one hydrochlorofluoroolefin (HCFO) used in the preparation of foamable thermoplastic compositions. The HFOs of component (1) include, but are not limited too, 3,3,3-trifluoropropene (HFO-1243zf), 1,2,3,3,3-pentafluoropropene (HFO-1225ye), cis- and/or trans-1,3,3,3-tetrafluoropropene (HFO-1234ze), and 2,3,3,3-tetrafluoropropene (HFO 1234yf), and mixtures thereof. The HCFOs of component (2) include, but are not limited to, 1-chloro-3,3,3-trifluoropropene (HCFO-1233zd), 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) and mixtures thereof. The blowing agent compositions are useful in the production of low density insulating foams with improved k-factor.

1 . A polystyrene foam product comprising a blowing agent composition comprising a combination of the hydrofluoroolefin 1,3,3,3-tetrafluoropropene and the hydrochlorofluoroolefin 1-chloro-3,3,3-trifluoropropene wherein said thermoplastic foam product has a density less than about 63 kg/m 3 . 
     
     
         2 . The thermoplastic foam product of  claim 1  where said 1-chloro-3,3,3-trifluoropropene comprises greater than 75% of the trans-isomer. 
     
     
         3 . The thermoplastic foam product of  claim 1  wherein said blowing agent composition further comprises a coblowing agent selected from the group consisting of hydrofluorocarbons, alkanes, carbon dioxide, methyl formate, inert gases, atmospheric gases, alcohols, ethers, fluorinated ethers, unsaturated fluorinated ethers, ketones, fluoroketones, water, and mixtures thereof. 
     
     
         4 . The thermoplastic foam product of  claim 3  wherein said hydrofluorocarbon is selected from HFC-32, HFC-161, HFC-152, HFC-152a, HFC-143, HFC-143a, HFC-134, HFC-134a, HFC-125, HFC-245fa, HFC-365mfc, HFC-227ea, or mixtures thereof. 
     
     
         5 . The thermoplastic foam product of  claim 3  wherein said hydrofluorocarbon is selected from HFC-134a, HFC-152a, HFC-32, HFC-143a, HFC-245fa, or mixtures thereof. 
     
     
         6 . The thermoplastic foam product of  claim 3  wherein said alkane is selected from propane, butane, pentane, or hexane. 
     
     
         7 . The thermoplastic foam product of  claim 6  wherein said pentane is selected from n-pentane, cyclopentane, iso-pentane or mixtures thereof. 
     
     
         8 . The thermoplastic foam product of  claim 3  wherein said alcohol is selected from ethanol, iso-propanol, butanol, ethyl hexanol, methanol, or mixtures thereof. 
     
     
         9 . The thermoplastic foam product of  claim 3  wherein said ether is selected from dimethyl ether, diethyl ether, methylethyl ether, or mixtures thereof. 
     
     
         10 . The thermoplastic foam product of  claim 3  wherein said ketone is selected from acetone, methyl ethyl ketone, or mixtures thereof.