A latent mercaptan as a heat stabilizer

Details A latent mercaptan as a heat stabilizer A latent mercaptan as a heat stabilizer

C - Chemistry, Metallurgy

08

K

C08K 5/37 (2006.01) C08K 3/16 (2006.01) C08K 5/00 (2006.01) C08K 5/098 (2006.01) C08K 5/57 (2006.01) C08L 27/06 (2006.01) C08L 57/08 (2006.01)

Patent

CA 2240615

Both flexible and rigid vinyl chloride polymer compositions comprising a latent mercaptan-containing heat stabilizer are substantially free from the offensive odor typically associated with mercaptans and are protected during processing by the degradation products of the latent (i.e., blocked) mercaptan which include a free mercaptan. The free mercaptan thus released enhances the activity of metallic-based heat stabilizers such as zinc carboxylates and organotin carboxylates and mercaptides in the polymer composition. Other products of the degradation are believed to include carbocations of the blocking moiety which are stabilized by a molecular structure in which the electron deficiency is shared by several groups. The latent mercaptan is selected from the group consisting of a 2-S-(tetrahydropyranyl)- thioalkanol and a carboxylic acid ester thereof.

Des compositions à base de polymère de chlorure de vinyle de type aussi bien flexible que rigide, renfermant un thermostabilisateur qui contient à l'état latent un mercaptan, sont pratiquement dépourvues de l'odeur désagréable, associée aux mercaptans, et sont protégées lors du traitement par les produits de dégradation du mercaptan à l'état latent (ç.-à-d. bloqué), qui comprend un mercaptan à l'état libre. Le mercaptan libre ainsi produit augmente l'activité des thermostabilisateurs à base métallique, comme les carboxylates de zinc, les carboxylates d'étain organique et les mercaptides, dans la composition polymérique. On pense qu'il y a d'autres produits de dégradation, notamment les carbocations de la fraction de blocage, stabilisés par une structure moléculaire, dans laquelle le manque d'électrons est partagé par plusieurs groupes. Le mercaptan à l'état latent est choisi parmi un 2-S-(tétrahydropyranyl)-thioalcanol et un ester de ce dernier avec un acide carboxylique.

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