Catalysts for polyurethane foam polyol premixes containing halogenated olefin blowing agents

Abstract

The invention provides polyurethane and polyisocyanurate foams and methods for the preparation thereof. More particularly, the invention relates to closed-celled, polyurethane and polyisocyanurate foams and methods for their preparation. The foams are characterized by a fine uniform cell structure and little or no foam collapse. The foams are produced with a polyol premix composition which comprises a combination of a hydrohaloolefin blowing agent, a polyol, a silicone surfactant, and a non-amine catalyst used alone or in combination with an amine catalyst.

What is claimed is: 
     
         1 . A stored foamable composition having storage stability comprising:
 a. from about 1 wt. % to about 30 wt. % of blowing agent, said blowing agent comprising from about 5 wt. % to about 90 wt % of trans-1,3,3,3-tetrafluoropropene and/or trans-1-chloro-3,3,3-trifluoropropene,   b. one or more polyols,   c. one or more surfactants, and   d. a non-amine catalyst comprising an organometallic compound wherein the organometallic compound independently comprises a carboxylate salt of a metal selected from the group consisting of bismuth, zinc, tin and combinations thereof, wherein said stored foamable composition has been stored for a period of at least several weeks and is sufficiently stable to form foams with no substantial collapse after said period of storage.   
     
     
         2 . The foamable composition of  claim 1  wherein said non-amine catalyst comprises zinc 2-ethylhexanoate. 
     
     
         3 . The foamable composition of  claim 2  wherein said non-amine catalyst is present in an amount of about 0.25 wt. % to about 3.0 wt. %, by weight of the composition. 
     
     
         4 . The foamable composition of  claim 1  wherein said blowing agent further comprises a co-blowing agent selected from the group consisting of water, hydrocarbon, fluorocarbon, chlorocarbon, hydrochlorofluorocarbon, hydrofluorocarbon, halogenated hydrocarbon, ether, ester, alcohol, aldehyde, ketone, organic acid, gas generating material, and combinations thereof. 
     
     
         5 . The foamable composition of  claim 1  further comprising an amine catalyst, provided said amine catalyst is present in an amount that does not negate the foam forming ability of said foamable composition after said storage period. 
     
     
         6 . The foamable composition of  claim 5  wherein the amine catalyst is selected from the group consisting of N,N,N′,N″,N″-pentamethyldiethyltriamine, N,N-dicyclohexylmethylamine; N,N-ethyldiisopropylamine; N,N-dimethylcyclohexylamine; N,N-dimethylisopropylamine; N-methyl-N-isopropylbenzylamine; N-methyl-N-cyclopentylbenzylamine; N-isopropyl-N-sec-butyl-trifluoroethylamine; N,N-diethyl-(α-phenylethyl)amine, N,N,N-tri-n-propylamine, dicyclohexylamine; t-butylisopropylamine; di-t-butylamine; cyclohexyl-t-butylamine; di-sec-butylamine, dicyclopentylamine; di-(α-trifluoromethylethyl)amine; di-(α-phenylethyl)amine; triphenylmethylamine; 1,1-diethyl-n-propylamine; dimorpholinodiethylether; N-ethylmorpholine; N-methylmorpholine; bis(dimethylaminoethyl) ether; imidizole; n-methylimidazole; 1,2-dimethylimidazole; dimorpholinodimethylether; N,N,N′,N′,N″,N″-pentamethyldiethylenetriamine; N,N,N′,N′,N″,N″-pentaethyldiethylenetriamine; N,N,N′,N′,N″,N″-pentamethyldipropylenetriamine; bis(diethylaminoethyl) ether; bis(dimethylaminopropyl) ether; and combinations thereof. 
     
     
         7 . A stored polyol premix composition having storage stability comprising:
 a. from about 1 wt. % to about 30 wt. % of blowing agent, said blowing agent comprising from about 5 wt. % to about 90 wt % of trans-1,3,3,3-tetrafluoropropene and/or trans-1-chloro-3,3,3-trifluoropropene,   b. one or more polyols,   c. one or more surfactants, and   d. a non-amine catalyst comprising an organometallic compound wherein the organometallic compound comprises a carboxylate salt of a metal selected from the group consisting of bismuth, zinc, tin and combinations thereof, wherein said polyol premix composition has been stored for a period of at least several weeks and is sufficiently stable to form foams with no substantial collapse after said period of storage.   
     
     
         8 . The polyol premix composition of  claim 7  wherein said non-amine catalyst comprises zinc 2-ethylhexanoate. 
     
     
         9 . The polyol premix composition of  claim 8  wherein said non-amine catalyst is present in an amount of about 0.25 wt. % to about 3.0 wt. %, by weight of the composition. 
     
     
         10 . The polyol premix of  claim 7  further comprising an amine catalyst, provided said amine catalyst is present in an amount that does not negate the foam forming ability of said polyol premix composition after said storage period. 
     
     
         11 . The polyol premix of  claim 1  wherein said blowing agent comprises from about 5 wt. % to about 90 wt % of trans-1-chloro-3,3,3-trifluoropropene. 
     
     
         12 . The polyol premix of  claim 7  wherein said blowing agent comprises from about 5 wt. % to about 90 wt % of trans-1-chloro-3,3,3-trifluoropropene.