Unsaturated polyester-polyurethane hybrid resin foam...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/66 (2006.01) C08G 18/65 (2006.01) C08G 18/68 (2006.01) C08J 9/12 (2006.01)

Patent

CA 2113714

Water blown, thermosetting unsaturated polyester-polyurethane hybrid foam compositions are formed by the reaction of as A side composition and a B side composition. The A side composition comprises a polyfunctional isocyanate compound and a free radical initiator. The B side composition comprises a mixture of: (i) an ethylenically unsaturated monomer solution having dissolved therein about 30-90 weight percent of a polyester polyol having at least one ethylenically unsaturated group per molecule which has predominantly hydroxyl end groups; (ii) an amine compound having two or more primary or secondary amine groups in an amount effective to react with the A side composition to form small urea domains finely dispersed within a continuous polyester-polyurethane hybrid phase; and (iii) about 25 to about 150 equivalents water based on 100 equivalents of active hydrogen in the B side. When the A and B side compositions are reacted, the composition will have a ratio of active NCO groups of the isocyanate to active NH groups of the amine compound of between about 10:1 and about 50:1, and an isocyanate index, NCO:(NH + OH + COOH + HOH), of between about 0.5 and about 2Ø

L'invention concerne des compositions de mousses hybrides de polyester-polyuréthane insaturées thermodurcissables qui sont formées par mise en réaction d'une composition A et d'une composition B. La composition A contient un composé d'isocyanate polyfonctionnel et une amorce à radicaux libres. La composition B contient un mélange de: (i) une solution de monomère à insaturation éthylène dans laquelle est dissous environ 30 à 90 % en poids de polyol de polyester contenant au moins un groupe à insaturation éthylène par molécule présentant des groupes de terminaisons principalement hydroxyle: (ii) un composé amine présentant un ou plusieurs groupes amine primaires ou secondaires en quantité suffisante pour réagir avec la composition A afin de former des petits domaines urée finement dispersés dans une phase hybride continue polyester-polyuréthane; et (iii) environ 25 à 150 équivalents d'eau sur la base de 100 équivalents d'hydrogène actif dans la composition B. Lorsque les compositions A et B sont mises en réaction, le mélange résultant présentera un rapport entre les groupes NCO actifs de l'isocyanate et les groupes NH actifs du composé d'amine d'environ 10:1 à environ 50:1, et un indice d'isocyanate, NCO(NH + OH + COOH + HOH) d'environ 0,5 à 2,0.

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