Abstract: Novel copolymers having a density (D) in the range 0.895-0.910 g/cm3, a melt index MI2 (2.16 kg, 190° C.) in the range of 0.01-6 g/10 min, a Compositional Distribution Branch Index (CDBI) in the range 55-85%, and a sealing initiation temperature (SIT) and density (D) satisfying the relationship SIT?(A×D)?B wherein A is 800° C.×cm3/g and B is 650° C., wherein the SIT (° C.) is determined on a 70 ?m film at 0.5N/15 mm and D Is in units of g/cm3 are disclosed. The copolymers may be suitably prepared by use of metallocene catalyst systems and may be used in film applications, in particular as sealing layers for packaging applications.

Abstract: Novel copolymers having a density (D) in the range 0.895-0.910 g/cm3, a melt index MI2 (2.16 kg, 190° C.) in the range of 0.01-6 g/10 min, a Compositional Distribution Branch Index (CDBI) in the range 55-85%, and a sealing initiation temperature (SIT) and density (D) satisfying the relationship SIT?(A×D)?B wherein A is 800° C.×cm3/g and B is 650° C., wherein the SIT (° C.) is determined on a 70 ?m film at 0.5N/15 mm and D Is in units of g/cm3 are disclosed. The copolymers may be suitably prepared by use of metallocene catalyst systems and may be used in film applications, in particular as sealing layers for packaging applications.

Abstract: Method for controlling a process for the production of a polymer by polymerization of a monomer and a comonomer. The process includes maintaining a substantially constant effective flow ratio (EFR), the effective flow ratio being defined as EFR=(Qcomo?Lcomo)/(Qmono?Lmono), Qcomo and Qmono being, respectively, flow rates of comonomer and monomer to the reactor, Lcomo and Lmono being, respectively, losses of comonomer and monomer.

Abstract: The present invention relates to methods for controlling a process for the production of a polymer by polymerisation of a monomer which process comprises at least one of: maintaining a substantially constant effective flow ratio (EFR), said effective flow ratio being defined as: EFR=(Qcomo?Lcomo)/(Qmono—Lmono) Qcomo and Qmono being, respectively, flow rates of comonomer and monomer to the reactor, Lcomo and Lmono being, respectively losses of comonomer and monomer, and: maintaining a substantially constant effective flow ratio (EFR), said effective flow ratio being defined as: EFR?(Qhyd—Lhyd)/(Qmono—Lmono) Qhyd and Qmono being, respectively, flow rates of hydrogen and monomer reactor, Lhyd and Lmono being, respectively, losses of hydrogen and monomer.