Storage stability foamable composition comprising 1,1,1,4,4,4-hexafluoro-2-butene

In certain non-limiting aspects, the present invention is suitable for the preparation of polyurethane foams or polyisocyanurate foams relates storage stable polyol premixes, premix is ​​at least 1,1,1 as a blowing agent, and 4,4,4-hexafluoro-2-butene (1336mzzm), an amount suitable for the preparation of any one or more of the other additives and / or auxiliary blowing agent a polyurethane foam or polyisocyanurate foam including in. .BACKGROUND