Tetrafluoropropene based blowing agent compositions

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/14 (2006.01)

Patent

CA 2750651

The present invention relates to blowing agent compositions comprising tetrafluoropropene (HFO) and at least one co-blowing agent selected from carbon dioxide, water, alkanes and an alcohol used in the preparation of foamable thermoplastic compositions having low density. The HFOs include, but are not limited too, cis- and/or trans- 1,3,3,3-tetrafluoropropene (HFO-1234ze), 2,3,3,3-tetrafluoropropene (HFO 1234yf), or mixtures thereof. The blowing agent compositions are useful in the production of low density insulating foams with improved R value.

La présente invention concerne des compositions d'agent d'expansion qui comportent du tétrafluoropropène (HFO) et au moins un co-agent d'expansion choisi parmi le dioxyde de carbone, l'eau, les alcanes et un alcool utilisés dans la préparation de compositions thermoplastiques expansibles ayant une faible densité. Les HFO incluent entre autres le cis- et/ou trans- 1,3,3,3-tétrafluoropropène (HFO-1234ze), le 2,3,3,3-tétrafluoropropène (HFO-1234yf) ou les mélanges de ces composés. Les compositions d'agent d'expansion sont utiles dans la production de mousses isolantes de faible densité avec une valeur R améliorée.

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