Fibers and yarns from a fluorinated polyester blend
View Patent ↗Yarns comprising fibers comprising a fluorinated polyester blend are prepared by melt blending a fluorovinyl ether functionalized polyester with a non-fluorinated polyester. The fluoroether functionalized polyester can be a homopolymer or a copolymer. The yarns and fibers, and the textile and carpet goods produced therefrom, exhibit durable soil, oil, and water repellency.
1. A fiber or yarn comprising a blend composition comprising a first aromatic polyester selected from the group consisting of poly(trimethylene terephthalate) (PTT), poly(ethylene naphthalate) (PEN), poly(ethylene isophthalate), poly(trimethylene isophthalate), poly(butylene isophthalate), mixtures thereof, and copolymers thereof, and a second aromatic polyester in contact therewith, wherein the second aromatic polyester is present in the blend composition at a concentration; and, wherein the second aromatic polyester comprises a molar concentration of fluorovinylether functionalized repeat units represented by structure I
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 (II)
with the proviso that only one R can be OH or the radical represented by the structure II;
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 or Cl;
a=0 or 1;
and,
Q represents the structure (Ia)
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 fiber or yarn of claim 1 wherein in the blend composition the first aromatic polyester is poly(trimethylene terephthalate).
3. The fiber or yarn of claim 1 wherein in the blend composition the second aromatic polyester is present at a concentration of 0.1 to 10% by weight.
4. The fiber or yarn of claim 1 wherein in the blend composition the second aromatic polyester the fluorovinylether functionalized repeat unit represented by Structure I is dimethyl 5-(1,1,2-trifluoro-2-(1,1,2,3,3,3-hexafluoro-2-(perfluoropropoxy)propoxy)ethoxy) isophthalate.
5. The fiber or yarn of claim 4 wherein the dimethyl 5-(1,1,2-trifluoro-2-(1,1,2,3,3,3-hexafluoro-2-(perfluoropropoxy)propoxy)ethoxy) isophthalate is present at a molar concentration in the range of 40 to 60 mol-%.
6. The fiber or yarn of claim 1 wherein the second aromatic polyester the fluorovinylether functionalized repeat unit represented by Structure I is dimethyl 5-(1,1,2-trifluoro-2-(perfluoropropoxy)ethoxy) isophthalate.
7. The fiber or yarn of claim 6 wherein the dimethyl 5-(1,1,2-trifluoro-2-(perfluoropropoxy)ethoxy) isophthalate is present at a molar concentration in the range of 40 to 60 mol-%.
8. The fiber or yarn of claim 1 wherein in the blend composition the first aromatic polyester is poly(trimethylene terephthalate), the second aromatic polyester is present at a concentration in the range of 1-3% by weight, wherein the second aromatic polyester the fluorovinylether functionalized repeat unit represented by Structure I is dimethyl 5-(1,1,2-trifluoro-2-(1,1,2,3,3,3-hexafluoro-2-(perfluoropropoxy)propoxy)ethoxy)isophthalate present at a molar concentration of 40-60 mol-%.
9. The fiber or yarn of claim 1 further comprising individual filaments having a denier per filament in the range of 15 to 25.
10. The fiber or yarn of claim 1 further comprising individual filaments having a denier per filament in the range of 1 to 3.
11. The fiber or yarn of claim 9 having a cross-sectional shape in the form of a modified delta.