申请人:Coughlin Michael Cregg
公开号:US20110257423A1
公开(公告)日:2011-10-20
An emulsion polymerization process for the production of fluoroelastomers is disclosed wherein at least one fluorosurfactant is employed as dispersant, said fluorosurfactant being a fluoroalkylphosphoric acid ester of the formula X—Rf—(CH
2
)
n
—O—P(O)(OM)
2
, wherein n=1 or 2, X=H or F, M=a univalent cation, and Rf is a C
4
-C
6
fluoroalkyl or fluoroalkoxy group. Optionally, a second dispersing agent may be employed in the polymerization, said second agent being a perfluoropolyether having at least one endgroup selected from the group consisting of carboxylic acid, a salt thereof, sulfonic acid and a salt thereof, phosphoric acid and a salt thereof.
揭示了一种用于生产氟弹性体的乳液聚合工艺,其中至少使用一种氟表面活性剂作为分散剂,所述氟表面活性剂为公式X—Rf—(CH2)n—O—P(O)(OM)2的氟烷基磷酸酯,其中n=1或2,X=H或F,M=一价阳离子,Rf为C4-C6氟烷基或氟烷氧基。可选地,在聚合过程中可以使用第二种分散剂,所述第二种剂为一种全氟聚醚,其至少具有一个末端基团,所述末端基团选自羧酸、其盐、磺酸及其盐、磷酸及其盐的群。