FOAMS AND ARTICLES MADE FROM FOAMS CONTAINING HCFO OR HFO BLOWING AGENTS
Polyurethane foams having a polymeric foam structure including a plurality of closed cells therein; and an HFO or HCFO blowing agent, including HCFO-1233zd or HFO-1234ze. In certain aspects, foam premixes, and the resulting foam structures, that include HCFO-1233zd as blowing agent used alone, or in certain aspects, in blend with a co-blowing agent such as methyl formate are disclosed.
1 . A thermal insulating foam comprising thermoset polymer having a plurality of closed cells and a gaseous composition contained in a plurality of said closed cells, said gaseous composition comprising greater than about 50 mole % to less than about 100 mole % trans-1-chloro-3,3,3-trifluoropropene and greater than about 0 mole % to less than about 50 mole % of methyl formate, said percentages based on the total of said trans-1-chloro-3,3,3-trifluoropropene and methyl formate.
2 . The thermal insulating foam of claim 1 wherein said K-value at 55° F. after 28 days of aging is not greater than about 0.14.
3 . The thermal insulating foam of claim 1 wherein said K-value at 40° F. after 28 days of aging is not greater than about 0.13.
4 . The thermal insulating foam of claim 1 wherein said K-value at 20° F. after 28 days of aging is not greater than about 0.13.
5 . The thermal insulating foam of claim 1 wherein methyl formate is present in an amount between about 25 mole % and about 50 mole %.
6 . A pour-in-place foam panel comprising the foam of claim 1 .
7 . The pour-in-place foam panel of claim 6 , wherein methyl formate is present in an amount between about 25 mole % and about 50 mole %.
8 . A thermal insulating article comprising a foam of claim 1 .
9 . A polyol premix for forming an polyurethane or polyisocyanurate pour-in-place foam panel comprising a blowing agent composition comprising greater than about 50 mole % to less than about 100 mole % trans-1-chloro-3,3,3-trifluoropropene and greater than about 0 mole % to less than about 50 mole % of methyl formate, said percentages based on the total of said trans-1-chloro-3,3,3-trifluoropropene and methyl formate.
10 . The polyol premix of claim 9 wherein the polyol component is present in an amount of from about 60 wt. % to about 95 wt. % of the premix and wherein the blowing agent composition is in an amount of from about 1 wt. % to about 30 wt. %.
11 . The polyol premix of claim 10 , wherein the blowing agent composition further comprises at least one additional blowing agent other than trans-1-chloro-3,3,3-trifluoropropene or methyl formate, which is selected from the group consisting of water, organic acids that produce CO 2 and/or CO, hydrocarbons; ethers, halogenated ethers; esters, alcohols, aldehydes, ketones, pentafluorobutane; pentafluoropropane; hexafluoropropane; heptafluoropropane; trans-1,2 dichloroethylene; methylal, 1-chloro-1,2,2,2-tetrafluoroethane (HCFC-124); 1,1-dichloro-1-fluoroethane (HCFC-141b); 1,1,1,2-tetrafluoroethane (HFC-134a); 1,1,2,2-tetrafluoroethane (HFC-134); 1-chloro 1,1-difluoroethane (HCFC-142b); 1,1,1,3,3-pentafluorobutane (HFC-365mfc); 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea); trichlorofluoromethane (CFC-11); dichlorodifluoromethane (CFC-12); dichlorofluoromethane (HCFC-22); 1,1,1,3,3,3-hexafluoropropane (HFC-236fa); 1,1,1,2,3,3-hexafluoropropane (HFC-236e); 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea), difluoromethane (HFC-32); 1,1-difluoroethane (HFC-152a); 1,1,1,3,3-pentafluoropropane (HFC-245fa); 1,3,3,3-tetrafluoropropene (HFO-1234ze); 1,1,1,4,4,4-hexafluorobut-2-ene (HFO-1336mzzm); butane; isobutane; n-pentane, iso-pentane, cyclopentane and combinations thereof.
12 . The polyol premix of claim 9 , further comprising one or more additional agents selected from the group consisting of a silicone surfactant, a non-silicone surfactant, a metal catalyst, an amine catalyst, a flame retardant, and combinations thereof.