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US 7,842,627 B2Granted
Olefin block compositions for stretch fabrics with wrinkle resistance
AssigneeDow Global Technologies LLC
InventorsTong Gao, Hongyu Chen, Alberto Lora Lamia, Yuen-Yuen D. Chiu, Jerry Chien Ting Wang, Shih-Yaw Lai
Life of this patent
Estimating the term…
Abstract
Compositions having good wrinkle resistance and other properties when made into garments an be made from an ethylene multi-block copolymers. The resulting fabrics and garments often have good chemical resistance, heat-resistances, and are dimensionally stable.
Claims25
A stretch fabric comprising:
- (A) an ethylene/α-olefin block interpolymer, wherein the ethylene/α-olefin interpolymer before crosslinking is characterized by one or more of the following characteristics:
- (1) an average block index greater than zero and up to about 1.0 and a molecular weight distribution, Mw/Mn, greater than about 1.3;
- or
- (2) at least one molecular fraction which elutes between 40° C. and 130° C. when fractionated using TREF, characterized in that the fraction has a block index of at least 0.5 and up to about 1;
- or
- (3) an Mw/Mn from about 1.7 to about 3.5, at least one melting point, Tm, in degrees Celsius, and a density, d, in grams/cubic centimeter, wherein the numerical values of Tm and d correspond to the relationship:
- Tm>−2002.9+4538.5(d)−2422.2(d)2;
- or
- (4) an Mw/Mn from about 1.7 to about 3.5, and a heat of fusion, ΔH in J/g, and a delta quantity ΔT, in degrees Celsius defined as the temperature difference between the tallest DSC peak and the tallest CRYSTAF peak, wherein the numerical values of ΔT and ΔH have the following relationships:
- ΔT>−0.1299(ΔH)+62.81 for ΔH greater than zero and up to 130 J/g,
- ΔT≧48° C. for ΔH greater than 130 J/g,
- wherein the CRYSTAF peak is determined using at least 5 percent of the cumulative polymer, and if less than 5 percent of the polymer has an identifiable CRYSTAF peak, then the CRYSTAF temperature is 30° C.;
- or
- (5) an elastic recovery, Re, in percent at 300 percent strain and 1 cycle measured with a compression-molded film of the ethylene/α-olefin interpolymer, and has a density, d, in grams/cubic centimeter, wherein the numerical values of Re and d satisfy the following relationship when ethylene/α-olefin interpolymer is substantially free of a cross-linked phase:
- Re>1481−1629(d);
- or
- (6) a molecular fraction which elutes between 40° C. and 130° C. when fractionated using TREF, characterized in that the fraction has a molar comonomer content of at least 5 percent higher than that of a comparable random ethylene interpolymer fraction eluting between the same temperatures, wherein said comparable random ethylene interpolymer has the same comonomer(s) and has a melt index density, and molar comonomer content (based on the whole polymer) within 10 percent of that of the ethylene/α-olefin interpolymer;
- or
- (2) a storage modulus at 25° C., G′(25° C.), and a storage modulus at 100° C., G′(100° C.), wherein the ratio of G(25° C.) to G′(100° C.) is in the range of about 1:1 to about 9:1;
- and
- (B) a crosslinked cellulosic material;
- wherein the fabric has a stretch of at least 8 percent measured according to ASTM D3107, and wherein the fabric has a durable press rating of at least 3.0 after 5 times washing using AATCC-124 or Marks and Spencer P134.
19 more elements
A stretch fabric comprising:
- (A) an ethylene/α-olefin block interpolymer, wherein the ethylene/α-olefin interpolymer before crosslinking is characterized by one or more of the following characteristics:
- (1) an average block index greater than zero and up to about 1.0 and a molecular weight distribution, Mw/Mn, greater than about 1.3;
- or
- (2) at least one molecular fraction which elutes between 40° C. and 130° C. when fractionated using TREF, characterized in that the fraction has a block index of at least 0.5 and up to about 1;
- or
- (3) an Mw/Mn from about 1.7 to about 3.5, at least one melting point, Tm, in degrees Celsius, and a density, d, in grams/cubic centimeter, wherein the numerical values of Tm and d correspond to the relationship:
- Tm>−2002.9+4538.5(d)−2422.2(d)2;
- or
- (4) an Mw/Mn from about 1.7 to about 3.5, and a heat of fusion, ΔH in J/g, and a delta quantity ΔT, in degrees Celsius defined as the temperature difference between the tallest DSC peak and the tallest CRYSTAF peak, wherein the numerical values of AT and AH have the following relationships:
- ΔT>−0.1299(ΔH)+62.81 for ΔH greater than zero and up to 130 J/g,
- ΔT≧48° C. for ΔH greater than 130 J/g,
- wherein the CRYSTAF peak is determined using at least 5 percent of the cumulative polymer, and if less than 5 percent of the polymer has an identifiable CRYSTAF peak, then the CRYSTAF temperature is 30° C.;
- or
- (5) an elastic recovery, Re, in percent at 300 percent strain and 1 cycle measured with a compression-molded film of the ethylene/α-olefin interpolymer, and has a density, d, in grams/cubic centimeter, wherein the numerical values of Re and d satisfy the following relationship when ethylene/α-olefin interpolymer is substantially free of a cross-linked phase:
- Re>1481-1629(d);
- or
- (6) a molecular fraction which elutes between 40° C. and 130° C. when fractionated using TREF, characterized in that the fraction has a molar comonomer content of at least 5 percent higher than that of a comparable random ethylene interpolymer fraction eluting between the same temperatures, wherein said comparable random ethylene interpolymer has the same comonomer(s) and has a melt index density, and molar comonomer content (based on the whole polymer) within 10 percent of that of the ethylene/α-olefin interpolymer;
- or
- (2) a storage modulus at 25° C., G′(25° C.), and a storage modulus at 100° C., G′(100° C.), wherein the ratio of G(25° C.) to G′(100° C.) is in the range of about 1:1 to about 9:1;
- and
- (B) a crosslinked animal fiber;
- wherein the fabric has a stretch of at least 8 percent measured according to ASTM D3107, and wherein the fabric has a durable press rating of at least 3.0 after 5 times washing using AATCC-124 or Marks and Spencer P134.
19 more elements
Dependencies are inferred from the claim text.