FLAME, SMOKE AND TOXICITY RETARDANT COMPOSITION FOR USE IN POLYURETHANE/POLYISOCYANURATE COMPRISING FOAMS
A reactive mixture comprising a Fire, Smoke and Toxicity retardant (FST) composition for making a polyisocyanurate and/or polyurethane (PIR/PUR) comprising material, said FST composition comprising: a) at least one compound having at least one ethylenically unsaturated moiety having a number average equivalent weight<160 g/mol, and b) optionally one or more radical initiator compound characterized in that the onset temperature for radical polymerization (T onset ) of the ethylenically unsaturated compound with or without the radical initiator is 2° C. up to 40° C. lower than the maximum reaction temperature achieved during the process for making the PIR/PUR material (reaction exotherm (T reaction )).
1 . A reactive mixture for making a polyisocyanurate and/or polyurethane (PIR/PUR) comprising material, said reactive mixture comprising:
a fire retardant composition comprising:
a) at least one compound having at least one ethylenically unsaturated moiety having a number average equivalent weight<160 g/mol, and
b) optionally one or more radical initiator compound
characterized in that the onset temperature for radical polymerization (T onset ) of the ethylenically unsaturated compound with or without the radical initiator is 2° C. up to 40° C. lower than the maximum reaction temperature achieved during the process for making the PIR/PUR material (reaction exotherm (T reaction )), and
a polyisocyanate composition comprising one or more polyisocyanate compounds; and
an isocyanate-reactive composition comprising one or more isocyanate-reactive compounds; and
at least one catalyst compound suitable for making the PIR/PUR comprising material, and
optionally one or more blowing agents; and
optionally one or more surfactants, one or more antioxidants, or combinations thereof.
2 . The reactive mixture according to claim 1 , wherein the onset temperature for radical polymerization (T onset ) of the combination of the ethylenically unsaturated compound and the radical initiator in the fire retardant composition is 5-30° C. lower than the maximum reaction temperature achieved during the process for making the PIR/PUR material (reaction exotherm (T reaction )).
3 . The reactive mixture according to claim 1 , wherein the compound having at least one ethylenically unsaturated moiety is selected from an acrylate, methacrylate, acrylic acid, methacrylic acid, allyl alcohol or maleic acid and mixtures and derivatives thereof.
4 . The reactive mixture according to claim 1 , wherein the compound having at least one ethylenically unsaturated moiety comprises at least 1 ethylenically unsaturated moieties.
5 . The reactive mixture according to claim 1 , wherein the compound having at least one ethylenically unsaturated moiety has an equivalent weight<120 g/mol.
6 . The reactive mixture according to claim 1 , wherein the compound having at least one ethylenically unsaturated moiety further comprises one or more isocyanate reactive groups.
7 . The reactive mixture according to claim 1 , wherein the compound having at least one ethylenically unsaturated moiety as such and/or in the presence/or absence of radical initiator compounds has an onset temperature (T onset ) 5-15° C. lower than the maximum reaction temperature achieved during the process for making the PIR/PUR material.
8 . The reactive mixture according to claim 1 , wherein the compound having at least one ethylenically unsaturated moiety is selected from pentaerythritol tetraacrylate (PETRA), pentaerythritol triacrylate (PETA), ethylene glycol diacrylate (EGDA), hydroxyethyl acrylate (HEA), diethylene glycol diacrylate (DEGDA), hydroxyethyl methacrylate (HEMA), ethylene glycol dimethacrylate (EGDMA) and diethylene glycol dimethacrylate (DEGDMA).
9 . The reactive mixture according to claim 1 , wherein the radical initiator has an activation temperature (T activation ) 2-40° C. lower than the maximum reaction temperature achieved during the process for making the PIR/PUR material.
10 . The reactive mixture according to claim 1 , wherein the radical initiator is selected from peroxide compounds.
11 . The reactive mixture according to claim 1 , wherein the compound having at least one ethylenically unsaturated moiety has a boiling point under atmospheric pressure higher than 150° C.
12 . The reactive mixture according to claim 1 , wherein the amount of compound having at least one ethylenically unsaturated moiety in the reactive mixture is in the range 2 wt % up to 30 wt % calculated on the total weight of the reactive mixture.
13 . The reactive mixture according to claim 1 , wherein the amount of radical initiator compound(s) in the reactive composition is in the range 0.01 wt % up to 1 wt % calculated on the total weight of the reactive foam composition.
14 . (canceled)