A core-shell emulsion polymer comprising
A) a core composition comprising components (a) and (b):
(a) from about 40 to about 95% of styrene, alkyl substituted styrene, or alkyl (meth)acrylate; and
(b) from about 5 to about 60% of vinylidene chloride, vinyl chloride, or combinations thereof; and
B) a shell composition components (c) and (d):
(c) from about 50 to about 85% of
(I) R
f
1
(CH
2
)
m
Z-C(O)—C(R
1
)═CH
2
(II) R
f
2
(CH
2
CF
2
)
q
(CH
2
CH
2
)
r
Z-C(O)—C(R
1
)═CH
2
, or
(III) R
f
3
O(CF
2
CF
2
)
q
(CH
2
CH
2
)
r
Z-C(O)—C(R
1
)═CH
2
wherein
R
1
is hydrogen, Cl, F or CH
3
;
Z is —O—, —NH— or —S—;
R
f
1
and R
f
2
are each a C
4
or C
6
perfluoroalkyl; and
R
f
3
is a C
2
to C
7
perfluoroalkyl optionally interrupted by one to three ether oxygens; and
(d) from about 15 to about 50% of styrene, alkyl substituted styrene, or alkyl (meth)acrylate,
provided that i) the core composition comprises from about 20 to about 75% of the polymer; ii) when R
f
1
or R
f
2
has 4 carbons, R
1
is CH
3
; and iii) when R
f
3
has 2 or 3 carbons, R
1
is CH
3
.
一种核壳型乳液聚合物,包括:A)核心组分,包括组分(a)和组分(b):(a)约40%至约95%的
苯乙烯,烷基取代
苯乙烯或烷基(甲基)
丙烯酸酯;和(b)约5%至约60%的
乙烯基氯化物,
氯乙烯或其组合物;以及B)壳层组分,包括组分(c)和组分(d):(c)约50%至约85%的(I)Rf1(
CH2)mZ-C(O)-C(R1)= (II)Rf2(
CF2)q( )rZ-C(O)-C(R1)= 或(III)Rf3O(
CF2CF2)q( )rZ-C(O)-C(R1)= 其中R1为氢,Cl,F或
CH3;Z为-O-,-NH-或-S-;Rf1和Rf2分别为C4或C6
全氟烷基;Rf3为C2至C7的
全氟烷基,可选地由一到三个醚氧原子中断;以及(d)约15%至约50%的
苯乙烯,烷基取代
苯乙烯或烷基(甲基)
丙烯酸酯,前提是i)核心组分包含聚合物的约20%至约75%;ii)当Rf1或Rf2有4个碳时,R1为 ;以及iii)当Rf3有2或3个碳时,R1为 。