Process for preparing liquid overbased metal carboxylates, mixed metal stabilizers containing same, and stabilized halogen-containing polymers therewith

摘要

Liquid overbased alkali or alkaline earth metal carboxylates, particularly barium carboxylates, are prepared by a process which includes the use of a beta diketone as a reaction promoter during carbonation. Mixed metal stabilizers containing the overbased metal carboxylates are used as stabilizers for halogen-containing polymers such as polyvinyl chloride (PVC).

主权项

1. A process for preparing a phenol-free storage-stable liquid overbased alkali or alkaline earth metal salt comprising:
reacting a mixture of an alkali or alkaline earth metal base and a carboxylic acid with an equivalent ratio of metal base to carboxylic acid being greater than 1:1 in the presence of liquid hydrocarbon, and carbonating the reaction mixture in the presence of a 1,3-diketone which acts as a promoter of the reaction during carbonation in the absence of any phenol or phenolic derivative to produce the phenol-free storage-stable liquid overbased alkali or alkaline earth metal salt.