Polymer-based film with balanced properties
A film includes 20.0 weight percent to 69.5 weight percent of a linear low density polyethylene (LLDPE) based polymer. The LLDPE having a high density fraction (HDF) from 3.0% to 8.0%, an I 10 /I 2 ratio from 5.5 to 6.9, and a short chain branching distribution (SCBD) of less than or equal to 8.0° C. The film also includes 0.0 weight percent to 10.0 weight percent low density polyethylene (LDPE) based polymer, and 30.0 weight percent to 70.0 weight percent pore former.
1. A film comprising:
20.0 weight percent to 69.5 weight percent linear low density polyethylene (LLDPE) based polymer, wherein the LLDPE based polymer comprises
a high density fraction (HDF) from 3.0% to 8.0%, wherein the high density fraction is measured by crystallization elution fractionation (CEF) integration at temperatures from 93° C. to 119° C.,
an I 10 /I 2 ratio from 5.5 to 6.9, wherein I 2 is the melt index when measured according to ASTM D 1238 at a load of 2.16 kg and temperature of 190° C. and I10 is the melt index when measured according to ASTM D 1238 at a load of 10 kg and temperature of 190° C., and
a short chain branching distribution (SCBD) of less than or equal to 7.0° C., wherein the short chain branching distribution is measured by CEF full width at half height;
0.0 weight percent to 10.0 weight percent low density polyethylene (LDPE) based polymer; and
30.0 weight percent to 70.0 weight percent pore former.
2. A film according to claim 1 , wherein the film comprises from 40.0 weight percent to 60.0 weight percent LLDPE based polymer.
3. A film according to claim 1 , wherein the LLDPE based polymer has a zero shear viscosity ratio from 1.1 to 3.0.
4. A film according to claim 1 , wherein the LLDPE based polymer has a I 10 /I 2 ratio from 5.5 to 6.5.
5. A film according to claim 1 , wherein:
the LLDPE based polymer has a density of 0.910 to 0.925 g/cm 3 ; and
the density is measured according to ASTM D792, Method B.
6. A film according to claim 1 , wherein:
the LLDPE based polymer has an I 2 from 1.0 to 6.0 g/10 mins; and
the I 2 is measured according to ASTM D 1238 at a load of 2.16 kg.
7. A film according to claim 1 , wherein the LLDPE based polymer has an I 2 from 3.0 to 4.0 g/10 mins.
8. A film according to claim 1 , wherein the film is a machine-direction oriented film.
9. A film according to claim 8 , wherein:
the film has a machine-direction orientation ratio from 2.5× to 6.0×; and
the machine-direction orientation ratio is calculated as ratio of the velocity of the film exiting the MDO unit to the velocity of the film entering the MDO unit.
10. A film according to claim 1 , wherein:
the film has an average machine-direction tear greater than or equal to 5.0 gf; and
the average machine-direction tear is measured according to Elmendorf Tear ASTM D 1922 measured at 14 gsm.
11. A film according to claim 1 , wherein:
the film has an average machine-direction force at 10% elongation of greater than or equal to 16.0 Newtons; and
the average machine-direction force at 10% elongation is measured according to ASTM D 638 at a tensile speed of 20 inch/minute and measured at 14 gsm.
12. A film according to claim 1 , wherein:
the film has an average water vapor transmission rate of greater than or equal to 15,000 g/m 2 /day; and
the average water vapor transmission rate is measured according to ASTM D6701 measured at 14 gsm, 100% RH, and 38° C.
13. A film according to claim 1 , wherein:
the film has a hydrostatic pressure of greater than or equal to 120 cm water; and
the hydrostatic pressure is measured according to ISO 1420 measured at 14 gsm.
14. A film according to claim 1 , wherein
the film has a loudness of less than 5.9 sones, wherein the loudness is measured at 18 gsm and a machine direction orientation ratio of less than or equal to 5.2×, or
the film has a loudness of less than 6.3 sones, wherein the loudness is measured at 18 gsm and a machine direction orientation ratio greater than 5.2× and less than or equal to 5.8×.
15. A hygiene absorbent product comprising the film according to claim 1 .
16. A film according to claim 1 , wherein the film has:
an average water vapor transmission rate (WVTR) of greater than or equal to 15,000 g/m 2 /day, measured according to ASTM D6701 measured at 14 gsm, 100% RH, and 38° C.;
a hydrostatic pressure of greater than or equal to 120 cm water, measured according to ISO 1420 measured at 14 gsm;
an average machine-direction tear (MD tear) of greater than or equal to 5.0 gf, measured according to Elmendorf Tear ASTM D 1922 measured at 14 gsm; and
an average machine-direction force at 10% elongation of greater than or equal to 16.0 Newtons, measured according to ASTM D 638 at a tensile speed of 20 inch/minute and measured at 14 gsm.
17. A film according to claim 1 , wherein:
the LLDPE polymer comprises a SCBD of less than 7.0° C. to 5.0° C.; and
the film has:
an average water vapor transmission rate (WVTR) of greater than or equal to 15,000 g/m 2 /day to 17,000 g/m 2 /day, measured according to ASTM D6701 measured at 14 gsm, 100% RH, and 38° C.,
a hydrostatic pressure of greater than or equal to 120 cm water to 129 cm water, measured according to ISO 1420 measured at 14 gsm,
an average machine-direction tear (MD tear) of greater than or equal to 5.0 gf to 7.0 gf, measured according to Elmendorf Tear ASTM D 1922 measured at 14 gsm, and
an average machine-direction force at 10% elongation of greater than or equal to 16.0 Newtons to 18.0 Newtons, measured according to ASTM D 638 at a tensile speed of 20 inch/minute and measured at 14 gsm.
18. A film according to claim 1 , wherein:
the LLDPE polymer comprises a SCBD of less than 7.0° C. to 6.5° C.; and
the film has:
an average water vapor transmission rate (WVTR) of greater than or equal to 16,000 g/m 2 /day to 16,750 g/m 2 /day, measured according to ASTM D6701 measured at 14 gsm, 100% RH, and 38° C.,
a hydrostatic pressure of greater than or equal to 123 cm water to 127 cm water, measured according to ISO 1420 measured at 14 gsm,
an average machine-direction tear (MD tear) of greater than or equal to 5.0 gf to 5.6 gf, measured according to Elmendorf Tear ASTM D 1922 measured at 14 gsm, and
an average machine-direction force at 10% elongation of greater than or equal to 16.0 Newtons to 16.4 Newtons, measured according to ASTM D 638 at a tensile speed of 20 inch/minute and measured at 14 gsm.