Aqueous suspension process for producing copolymers of vinyl chloride and vinyl esters
AssigneeThe Geon Company
InventorZaev Sharaby
Life of this patent
Estimating the term…
Abstract
Copolymers of vinyl or vinylidene halides and vinyl esters of fatty acids having low molecular weights, good particle characteristics, and improved melt flow are made by aqueous polymerization utilizing an effective amount of a mercaptan as a chain transfer agent, wherein the chain transfer agent is admixed with the vinyl esters to form a chain transfer composition, and the composition be added before the start of the polymerization.
Claims9
An aqueous suspension process for producing copolymers of vinyl chloride and up to 20 parts by weight of vinyl esters of fatty acids, said acids having from 4 to 26 carbon atoms, comprising using an effective amount of at least one mercaptan chain transfer agent, the improvement comprising encapsulating at least 0.25 part by weight of said chain transfer agent by admixing said chain transfer agent with an encapsulating amount of said vinyl ester to form an encapsulated mixture and adding said encapsulated mixture to the polymerization medium prior to the start of polymerization.
Dependencies are inferred from the claim text.