Curable compositions for producing polyurethane foams

Details Curable compositions for producing polyurethane foams Curable compositions for producing polyurethane foams

C - Chemistry, Metallurgy

08

G

403/13

C08G 18/79 (2006.01) C08G 18/40 (2006.01) C08G 18/42 (2006.01) C08G 18/48 (2006.01)

Patent

CA 1233949

CURABLE COMPOSITIONS FOR PRODUCING POLYURETHANE FOAMS ABSTRACT A composition curable by reaction with an organic polyisocyanate to a polymer foam in which the predominant recurring polymer unit is isocyanurate, comprises a halogenated organic blowing agent; a Polyester polyol mixture and a polyether polyol having an average hydroxyl functionality of at least 4 comprising the adduct of at least 4 moles of a C2-C6 alkylene oxide and an organic compound having at least 4 functional groups reactive with said alkylene oxide. The polyester polyl mixture is prepared by: (a) transesterification, with a glycol of molecular weight from 60 to 400, of a residue remaining after dimethyl terephthalate and methyl p-toluate have been removed from the product of oxidation of p-xylene in the preparation of dimethyl terephthalate; or (b) esterification, with an alkylene oxide selected from ethylene oxide, propylene oxide, butylene oxide, and mixtures thereof, of a carboxyl functional residue resulting from the removal of terephthalic acid from the mixture obtained by the oxidation of p-xylene in the preparation of terephthalic acid.

459430

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