Polymer blend comprising fluorinated block copolyester
View Patent ↗Disclosed are polymer blends prepared by melt blending a fluorinated block copolyester with a non-fluorinated polyester wherein the fluorinated block copolyester comprises blocks of fluoroether modified aromatic polyester and blocks of unmodified polyester. Suitable block copolyesters have a blockiness index, B, in the range of 0.25 to 1.0. Shaped articles prepared from the blends exhibit oil and soil resistance with high fluorine efficiency.
1. A polymer blend comprising a poly(alkylene arylate) and 0.1 to 10 weight percent based upon the total weight of the blend of a block copolymer having a blockiness index, B, in the range of 0.56 to 0.8, comprising a first block comprising a plurality of non-fluorinated alkylene arylate repeat units adjacent to one another; and a second block comprising a plurality of fluoroether functionalized alkylene arylate repeat units adjacent to one another; said non-fluorinated alkylene arylate repeat unit represented by Structure I
wherein each R is independently H or C1-C10 alkyl, and R3 is C2-C4 alkylene which can be branched or unbranched;
and, said fluoroether functionalized repeat units are represented by Structure II,
wherein, Ar represents a benzene or naphthalene radical; each R is independently H, C 1 -C 10 alkyl, C 5 -C 15 aryl, C 6 -C 20 arylalkyl; OH, or a radical represented by the Structure (III)
with the proviso that only one R can be OH or the radical represented by the Structure (III);
R 1 is a C 2 -C 4 alkylene radical which can be branched or unbranched,
X is O or CF 2 ;
Z is H, Cl, or Br;
a=0 or 1;
and,
Q represents the Structure (IIa)
wherein q=0-10;
Y is O or CF 2 ;
Rf 1 is (CF 2 ) n , wherein n is 0-10;
and,
Rf 2 is (CF 2 ) p , wherein p is 0-10, with the proviso that when p is 0, Y is CF 2 .
2. The polymer blend of claim 1 wherein the poly(alkylene arylate) is poly(trimethylene terephthalate).
3. The polymer blend of claim 1 wherein the block copolymer R 1 is an ethylene radical.
4. The polymer blend of claim 1 wherein the block copolymer R 1 is a trimethylene radical, which can be branched.
5. The polymer blend of claim 1 wherein the block copolymer R 1 is a tetramethylene radical, which can be branched.
6. The polymer blend of claim 1 wherein the block copolymer each R is H.
7. The polymer blend of claim 1 wherein the block copolymer the fluoroether functionalized alkylene arylate repeat unit, Ar is a benzene radical, a=1, each R is H, Z is H, R1 is trimethylene, X is O, Y is O, Rf 1 is CF 2 , and Rf 2 is (CF 2 ) 3 , and q=1.
8. The polymer blend of claim 1 wherein the block copolymer the fluoroether functionalized alkylene arylate repeat unit is represented by the Structure (IVb)
9. The polymer blend of claim 8 wherein a=1, Z is H, R 1 is trimethylene, X is O, Y is O, Rf 1 is CF 2 , and Rf 2 is (CF 2 ) 3 , and q=1.
10. The polymer blend of claim 1 wherein the block copolymer R 3 is trimethylene.
11. The polymer blend of claim 1 wherein the block copolymer the non-fluorinated repeat unit represented by Structure I is a trimethylene terephthalate diradical.
12. The polymer blend of claim 1 wherein the block copolymer is a multi-block copolymer.
13. The polymer blend of claim 1 wherein the block copolymer the non-fluorinated alkylene arylate repeat units and the fluoroether functionalized alkylene arylate repeat units are each present at a molar concentration, and wherein further, the mole ratio of non-fluorinated repeat units to fluoroether functionalized repeat units is in the range of 1.5 to 0.67.