Patent ID: 11905397
Assignee: DOW GLOBAL TECHNOLOGIES LLC
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 3:
4. A film comprising at least five layers a/b/c/d/e, wherein
the layer a is formed from an ethylene/α-olefin copolymer,
the layers d and e are formed from a composition comprising of the following components:
A) ≥80 wt %, based on the weight of the composition of an ethylene/α-olefin copolymer with a density from 0.87 g/cc to 0.885 g/cc and a Tm from 80° C. to 95° C.;
B) from 9 to 12 wt %, based on the sum weight of the components A and B, of a cycloolefin copolymer comprising, in polymerized form, ethylene and a bridged cyclic olefin consisting of:, , Structure a, wherein R1 and R2 are each, independently, selected from the group consisting of hydrogen and an alkyl;

C) from 5 wt % to 10 wt % of a slip agent, an anti-block additive or a combination thereof;

wherein the cycloolefin copolymer of the component B has a Tg from 60° C. to 90° C. and the weight ratio of the component A to the component B is from 4.0 to 10.0 based on the weight of the composition, and
wherein the composition has a fraction of enthalpy of crystallization above 60° C. relative to the total enthalpy of crystallization measured by DSC (Ec) value of 0.40,
a rheology ratio (RR) value of 10.0-16.0, a fraction of the enthalpy of melting below 85° C. relative to the total enthalpy of melting measured by DSC (E1) value from 0.84 to 0.92 and a fraction of the enthalpy of melting between Tm and 95° C. relative to the enthalpy of melting above Tm measured by DSC (E2) value from 0.92 to 0.98;
and
the layers b and c are formed from a composition comprising the following components:
D) more than 91 wt %, based on the weight of the composition, of an ethylene/α-olefin copolymer that has a density ≤0.885 g/cc and a Tm from 80° C. to 95° C.;
E) less than 9 wt %, based on the sum weight of the components A and B, of a cycloolefin copolymer comprising, in polymerized form, an ethylene and a bridged cyclic olefin consisting of, , Structure a, wherein R1 and R2 are each, independently, selected from the group consisting of hydrogen and an alkyl.