The present invention relates to a film comprising at least one sealing layer wherein at least one layer A of the sealing layer(s) comprises a polyethylene comprising moieties derived from ethylene and moieties derived from an -olefin comprising 4 to 10 carbon atoms, the polyethylene having a density of 870 and 920 kg/m3 as determined in accordance with ASTM D792 (2013), wherein the polyethylene has: x a fraction of material that is eluted in analytical temperature rising elution fractionation (a-TREF) at a temperature 30.0 C. of 5.0 wt %, preferably 10.0 wt %, with regard to the total weight of the polyethylene; x a shear storage modulus G determined at a shear loss modulus G=5000 Pa of >700 Pa, G and G being determined in accordance with ISO 6721-10 (2015) at 190 C.; x a melt mass-flow rate, determined at 190 C. under a load of 2.16 kg in accordance with ASTM D1238 (2013) of 2.60 and 4.90 g/10 min; and x a chemical composition distribution broadness (CCDB) of 15.0, preferably 20.0. Such film allows for sealing of the film at a reduced temperature, whilst still providing a desirable seal strength, and a desirable hot-tack strength.

Provided are bimodal medium density polyethylene compositions, and microirrigation drip tapes including the same. The bimodal medium density polyethylene compositions can be extruded at high lines speed while maintaining other desirable properties. The bimodal medium density polyethylene compositions include a high molecular weight (HMW) polyethylene component and a low molecular weight (LMW) polyethylene component. The bimodal medium density polyethylene composition has a density of from 0.937 to 0.946 g/cm.sup.3; a high load melt index (I21) from 7 to 20 g/10 min; a crossover G=G of from 30 to 50 kPa; a notched constant tensile load failure time at 30% yield stress, as measured according to ASTMD5397, of greater than 700 hours; and a strain hardening modulus of greater than 65 MPa.

Provided are bimodal medium density polyethylene compositions, and microirrigation drip tapes including the same. The bimodal medium density polyethylene compositions can be extruded at high lines speed while maintaining other desirable properties. The bimodal medium density polyethylene compositions include a high molecular weight (HMW) polyethylene component and a low molecular weight (LMW) polyethylene component. The bimodal medium density polyethylene composition has a density of from 0.937 to 0.946 g/cm.sup.3; a high load melt index (I21) from 7 to 20 g/10 min; a crossover G=G of from 30 to 50 kPa; a notched constant tensile load failure time at 30% yield stress, as measured according to ASTMD5397, of greater than 700 hours; and a strain hardening modulus of greater than 65 MPa.

Ethylene-based polymers having a melt index from 0.15 to 0.5 g/10 min, a high load melt index from 15 to 50 g/10 min, a density from 0.94 to 0.96 g/cm.sup.3, and a higher molecular weight component and a lower molecular weight component are disclosed. The higher molecular weight component has a HMW HL275 from 3 to 8 g/10 min and a HMW density from 0.92 to 0.94 g/cm.sup.3. These polymers can have one or more of an environmental stress crack resistance (ESCR) of at least 1,000 hr, a yield strength of 3,000 to 5,000 psi, a viscosity at 100 sec.sup.1 of 1,000 to 1,800 Pa-sec, and/or a notched constant ligament stress (NCLS) of 80 to 1,000 hr.

Ethylene-based polymers having a melt index from 0.15 to 0.5 g/10 min, a high load melt index from 15 to 50 g/10 min, a density from 0.94 to 0.96 g/cm.sup.3, and a higher molecular weight component and a lower molecular weight component are disclosed. The higher molecular weight component has a HMW HL275 from 3 to 8 g/10 min and a HMW density from 0.92 to 0.94 g/cm.sup.3. These polymers can have one or more of an environmental stress crack resistance (ESCR) of at least 1,000 hr, a yield strength of 3,000 to 5,000 psi, a viscosity at 100 sec.sup.1 of 1,000 to 1,800 Pa-sec, and/or a notched constant ligament stress (NCLS) of 80 to 1,000 hr.

Provided are bimodal medium density polyethylene compositions, and microirrigation drip tapes including the same. The bimodal medium density polyethylene compositions can be extruded at higher lines speed while maintaining other desirable properties. The bimodal medium density polyethylene compositions include a high molecular weight (HMW) polyethylene component and a low molecular weight (LMW) polyethylene component. In some embodiments, the bimodal medium density polyethylene composition has a density of from 0.937 to 0.949 g/cm.sup.3; a high load melt index (I21) from 12 to 30 g/10 min: a crossover G=G of from 30 to 45 kPa; and a calculated LMW density of the LWM polyethylene component of less than or equal to 0.974 g/cm.sup.3.

Provided are bimodal medium density polyethylene compositions, and microirrigation drip tapes including the same. The bimodal medium density polyethylene compositions can be extruded at higher lines speed while maintaining other desirable properties. The bimodal medium density polyethylene compositions include a high molecular weight (HMW) polyethylene component and a low molecular weight (LMW) polyethylene component. In some embodiments, the bimodal medium density polyethylene composition has a density of from 0.937 to 0.949 g/cm.sup.3; a high load melt index (I21) from 12 to 30 g/10 min: a crossover G=G of from 30 to 45 kPa; and a calculated LMW density of the LWM polyethylene component of less than or equal to 0.974 g/cm.sup.3.

The invention provides a metallocene-catalysed multimodal ethylene-1-butene random copolymer, having a density in the range of from 910 to 930 kg/m3, an MFR.sub.2 determined according to ISO 1133 at 190 C. and 2.16 kg in the range of from 0.1 to 3.0 g/10 min, a 1-butene content in the range of 1.0 to 20 wt %, an isolated 1-butene comonomer unit amount (EBE %) of greater than 97.0%, whereby the isolated 1-butene comonomer unit amount is calculated according to formula (I), wherein EBE represents amount of comonomer sequence of ethylene, 1-butene and ethylene per 1000 carbon (kCb), EBB represents amount of comonomer sequence of ethylene, 1-butene and 1-butene per 1000 carbon (kCb) and BBB represents amount of comonomer sequence of three consecutive 1-butenes per 1000 carbon (kCb) as described under Determination methods; and a ratio of the MFR.sub.21 determined according to ISO 1133 at 190 C. and 21.6 kg to MFR.sub.2 determined according to ISO 1133 at 190 C. and 2.16 kg, MFR.sub.21/MFR.sub.2, in the range of 22 to 100.

[00001]$\begin{array}{cc}\mathrm{EBE}\%=100\frac{EBE}{EBE+EBB+BBB}& \left(I\right)\end{array}$

The invention provides a metallocene-catalysed multimodal ethylene-1-butene random copolymer, having a density in the range of from 910 to 930 kg/m3, an MFR.sub.2 determined according to ISO 1133 at 190 C. and 2.16 kg in the range of from 0.1 to 3.0 g/10 min, a 1-butene content in the range of 1.0 to 20 wt %, an isolated 1-butene comonomer unit amount (EBE %) of greater than 97.0%, whereby the isolated 1-butene comonomer unit amount is calculated according to formula (I), wherein EBE represents amount of comonomer sequence of ethylene, 1-butene and ethylene per 1000 carbon (kCb), EBB represents amount of comonomer sequence of ethylene, 1-butene and 1-butene per 1000 carbon (kCb) and BBB represents amount of comonomer sequence of three consecutive 1-butenes per 1000 carbon (kCb) as described under Determination methods; and a ratio of the MFR.sub.21 determined according to ISO 1133 at 190 C. and 21.6 kg to MFR.sub.2 determined according to ISO 1133 at 190 C. and 2.16 kg, MFR.sub.21/MFR.sub.2, in the range of 22 to 100.

[00001]$\begin{array}{cc}\mathrm{EBE}\%=100\frac{EBE}{EBE+EBB+BBB}& \left(I\right)\end{array}$

Provided is an ethylene-acrylic acid copolymer which may maintain high initial adhesive properties for a long time by having a zero shear viscosity (.sub.0) and a storage modulus (G) in specific ranges.