申请人:——
公开号:US20020091212A1
公开(公告)日:2002-07-11
Use of surfactants in the suspension polymerization of fluorinated monomers for preparing fluoropolymers containing hydrogen, said surfacants having the general formula:
R
f
-[L-(OCHR
1
—CHR
2
)
m
—OZ)]
i
wherein:
i is equal to 1 or 2;
m is an integer comprised between 4 and 60;
L can be chosen between:
—(CFY—CO—O)
p
R′—
and
—(CFY—CO—NH)
p
R′—
wherein p is an integer equal to 0 or to 1;
Y=F, CF
3
;
R′=alkylic radical C
1
-C
5
, linear or branched when possible;
R
1
, R
2
can be both H or the former H and the latter CH
3
;
Z can be H, alkyl radical C
1
-C
3
, linear or branched when possible;
or (CH
2
)
n
OH with n an integer from 1 to 6;
R
f
is a perfluoroalkylic radical or a perfluoropolyether radical, having a number average molecular weight comprised between 250 and 1500.
在含氟单体的悬浮聚合中使用表面活性剂制备含氢氟聚合物,所述表面活性剂具有通式:
R
f
-[L-(OCHR
1
-CHR
2
)
m
-OZ)]
i
其中
i 等于 1 或 2
m 是介于 4 和 60 之间的整数;
L 可在以下两者之间选择
-(CFY-CO-O)
p
R′-
和
-(CFY-CO-NH)
p
R′-
其中 p 是等于 0 或 1 的整数;
Y=F, CF
3
;
R′-等于烷基 C
1
-C
5
尽可能为线性或支链;
R
1
, R
2
可以都是 H,或者前者是 H,后者是 CH
3
;
Z 可以是 H、烷基 C
1
-C
3
直链或支链
或 (CH
2
)
n
OH ,n 为 1 至 6 的整数;
R
f
是全氟烷基或全氟聚醚基,其平均分子量在 250 至 1500 之间。