Abstract: Disclosed are methods of forming foam comprising: (a) providing a foamable composition comprising an isocyanate, a polyol and a physical blowing agent comprising at least about 50% by weight of trans1233zd and wherein the polyol comprises a polyol or mixture of polyols such that the trans1233zd(E) has a solubility in said polyol of 20 pphp or less and (b) forming a foam from said foamable composition.

Abstract: Methods, foams and blowing agents for forming for forming extruded polystyrene foam wherein the blowing agent comprises (i) from about 40% by weight to about 70% by weight of one or more HFOs three or four carbon atoms and/or an HFCOs having three or four carbon atoms being selected from the group consisting of 1224yd(Z), 1233zd(E), 1336mzz(Z) and combinations of these; and (ii) from about 30% to about 60% by weight of isobutane, methyl formate and combinations of these.

Abstract: Methods, foams and blowing agents for producing thermoplastic foam having low aged lambda and low foam density, wherein the blowing agent comprises: (a) from about 50% by weight to about 70% by weight of an HFO and/or an HFCO having three atoms; (b) a first co-blowing agent consisting essentially of from about 2% to about 15% by weight of methyl formate; (c) a second co-blowing agent consisting essentially of from about 20% to about 30% by weight of dimethyl ether, isobutane and combinations of these; and (d) a third co-blowing agent consisting essentially of from about 2% to about 25% by weight of carbon dioxide, acetone and combinations of these.