Shaped articles comprising fluorinated block copolyesters
View Patent ↗Disclosed are shaped articles fabricated from polymer blends comprising a fluorinated block copolyester and 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 that can be made from the copolyesters include films, fibers, and molded parts.
1. A shaped article comprising 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 units represented by Structure I
wherein each R is independently H or C1-C10 alkyl, and R 3 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, C1-C10 alkyl, C5-C15 aryl, C6-C20 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 C2-C4 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 ;
R f 1 is (CF 2 ) n , wherein n is 0-10;
and,
R f 2 is (CF 2 ) p , wherein p is 0-10, with the proviso that when p is 0, Y is CF 2 .
2. The shaped article of claim 1 wherein the block copolymer R 1 is an ethylene radical, a trimethylene radical, or a tetramethylene radical.
3. The shaped article of claim 1 wherein the block copolymer each R is H.
4. The shaped article of claim 1 wherein the block copolymer Ar is a benzene radical, a=1, each R is H, Z is H, R 1 is trimethylene, X is O, Y is O, R f 1 is CF 2 , and R f 2 is (CF 2 ) 3 , and q=1.
5. The shaped article of claim 1 wherein the block copolymer R 3 is trimethylene.
6. The shaped article of claim 1 wherein the block copolymer the non-fluorinated repeat unit represented by Structure I is a trimethylene terephthalate diradical.
7. The shaped article of claim 1 wherein the block copolymer is a multi-block copolymer.
8. The shaped article 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.
9. The shaped article of claim 1 further comprising a poly(alkylene arylate) blended with the block copolymer at a concentration therein.
10. The shaped article of claim 9 wherein the poly(alkylene arylate) is poly(trimethylene terephthalate).
11. The shaped article of claim 9 wherein concentration of the block copolymer in the blend is in the range of 0.5 to 10% by weight with respect to the total weight of the blend.
12. The shaped article of claim 1 wherein the block copolymer the fluoroether functionalized alkylene arylate repeat unit is represented by the Structure (IVb)
13. The shaped article of claim 12 wherein a=1, Z is H, R 1 is trimethylene, X is O, Y is O, R f 1 is CF 2 , and R f 2 is, (CF 2 ) 3 and q=1.
14. The shaped article of claim 12 wherein the block copolymer R 3 is trimethylene.
15. The shaped article of claim 1 in the form of a film.
16. The shaped article of claim 1 in the form of a fiber.