公开(公告)号：EP0406349B1

公开(公告)日：1994-12-21

申请号：EP89912182.6

申请日：1989-10-06

Applicant: ATOCHEM NORTH AMERICA, INC.

Inventor： SILBERMANN, Joseph ,  SMITH, William, L.

IPC: C08K5/58

CPC classification number: C08K5/005 ,  C08K3/32 ,  C08K5/58 ,  C08L27/06

Abstract: Improved stabilizer compositions are provided which impart significant long-term heat stabilization to halogen-containing vinyl polymers such as polyvinyl chloride. The improved stabilizer compositions combine one or more metal-containing primary stabilizer compounds with a finely divided co-stabilizing phosphate material of a predetermined surface area. The phosphate material includes an anhydrous or hydrous sodium or potassium monohydrogen phosphate, lithium dihydrogen phosphate, or alkali-metal pyrophosphate. The novel combination of stabilizers enables a reduction in the amount of metal-containing stabilizer, if desired, while still yielding long-term stability in the resultant polymer, or provides the ability to raise process temperature and reduce cycle times of molding operations.