Polyhydroxy curable fluoroelastomer compositions

摘要

Disclosed herein is a curable composition comprising a polyhydroxy curable fluoroelastomer, a polyhydroxy curative, a cure accelerator and an unsaturated metal compound process aid. Such curable compositions have a lower Mooney viscosity than do similar compositions absent the process aid.

主权项

1. A curable fluoroelastomer composition comprising:
A) a polyhydroxy curable fluoroelastomer consisting essentially of
i) vinylidene fluoride, hexafluoropropylene, and optionally tetrafluoroethylene,ii) vinylidene fluoride, perfluoro(alkyl vinyl ether), 2-hydropentafluoropropylene, and optionally tetrafluoroethylene;iii) tetrafluoroethylene, propylene, and optionally 3,3,3-trifluoropropene;iv) tetrafluoroethylene, perfluoro(methyl vinyl ether) and hexafluoro-2-(pentafluorophenoxy)-1-(trifluorovinyloxy) propane, orv) ethylene, tetrafluoroethylene, perfluoro(methyl vinyl ether), and optionally 3,3,3-trifluoropropylene; B) a polyhydroxy curative; C) a cure accelerator; and D) an unsaturated metal compound process aid having the formula Y(4-n)MXn wherein Y is selected from alkyl, aryl, carboxylic acid, or alkyl ester groups; M is selected from Si, Ge, or Sn; X is an allyl group CR1R2CR3═CR4R5, vinyl group CR1═CR2R3, allenyl group CR1═C═CR2R3, alkynyl group C≡CR1, or propargyl group CR1R2C≡CR3; R1-R5 are selected independently from the group consisting of H, F, alkyl, aryl, heterocycle, or perfluoroalkyl groups; and n is 1,2, or 3.