Combination heat stabilizer/lubricant for pvc processing and...

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 323/52 (2006.01) C07F 3/06 (2006.01) C08K 5/00 (2006.01) C08K 5/098 (2006.01) C08K 5/37 (2006.01) C08L 27/00 (2006.01) C09K 15/32 (2006.01)

Patent

CA 2114169

The preparation of a zinc mercaptoacid ester by the reaction of zinc oxide with the mercaptoacid ester in a wax matrix provides an improved heat stabilizer for halogen-containing polymer compositions. The process obviates the necessity of isolating and transporting the normally very viscous zinc mercaptoacid esters. The zinc mercaptoacid ester/wax matrix is also an expedient medium for the preparation and utilization of calcium stearate as a lubricant in the heat stabilizer composition and the stabilized polymer composition containing it. A paraffin wax is the preferred matrix for the preparation and use of the heat stabilizer and lubricant.

La préparation d'un ester de mercaptoacide zincique par réaction d'oxyde de zinc avec l'ester du mercaptoacide dans une matrice de cire permet d'obtenir un thermostabilisant amélioré pour les compositions de polymères contenant des halogènes. Le procédé permet d'éviter d'avoir à isoler et à transporter les esters de mercaptoacide zincique normalement très visqueux. La matrice de cire/ester de mercaptoacide zincique est aussi un milieu pratique pour la préparation et l'utilisation de stéarate de calcium comme lubrifiant dans la composition thermostabilisante et dans la composition de polymère stabilisé la contenant. Une paraffine est choisie de préférence comme matrice pour la préparation et l'utilisation du thermostabilisant et du lubrifiant.

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