C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/80 (2006.01) C08G 18/72 (2006.01) C08G 18/78 (2006.01) C08G 18/79 (2006.01) C09D 175/04 (2006.01)
Patent
CA 2209590
Disclosed is a 1,2,4-triazole-blocked polyisocyanate which is a physical mixture of (i) a polyisocyanate component derived from an aliphatic diisocyanate and (ii) a polyisocyanate component derived from a (cyclo)aliphatic or cycloaliphatic diisocyanate at a weight ratio of 90:10 to 10:90. The polyisocyanate components (i) and (ii) are urethane-functional, biuret-functional or isocyanurate-functional. The blocked polyisocyanate has a high reactivity and is useful in producing a polyurethane, especially in a heat-curable coating composition.
On divulgue un polyisocyanate bloqué par du 1,2,4-triazole qui est un mélange mécanique (i) d'un constituant polyisocyanate dérivé d'un diisocyanate aliphatique et (ii) d'un constituant polyisocyanate dérivé d'un diisocyanate(cyclo)aliphatique ou cycloaliphatique dans un rapport pondéral de 90:10 à 10:90. Les constituants polyisocyanate (i) et (ii) portent des groupes fonctionnels uréthane, biuret ou isocyanurate. Le polyisocyanate bloqué possède une réactivité élevée et est utile pour produire un polyuréthane, surtout une composition de revêtement thermodurcissable.
Degussa Ag
Fetherstonhaugh & Co.
Huls Aktiengesellschaft
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