Copolymers and films thereof

Patent metadata

Field	Value
Publication number	US-2018201705-A1
Application number	US-201615742552-A
Country	US
Kind code	A1
Filing date	Jul 7, 2016
Priority date	Jul 9, 2015
Publication date	Jul 19, 2018
Grant date	—

Abstract

Novel copolymers having a density (D) in the range 0.895-0.910 g/cm 3 , a melt index MI 2 (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.×cm 3 /g and B is 650° C., wherein the SIT (° C.) is determined on a 70 μm film at 0.5N/15 mm and D Is in units of g/cm 3 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.

First claim

1 .- 18 . (canceled)

19 . A copolymer of ethylene and an alpha-olefin, said copolymer having
(a) a density (D) in the range 0.895-0.910 g/cm3, (b) a melt index MI2 (2.16 kg, 190° C.) in the range of 0.01-6 g/10 min, (c) a Compositional Distribution Branch Index (CDBI) in the range 55-85%, and (d) 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., and
wherein the SIT (° C.) is determined on a 70 μm film at 0.5N/15 mm and D is in units of g/cm 3 .

20 . A copolymer according to claim 19 having a Compositional Distribution Branch Index (CDBI) in the range 65-85%.

21 . A copolymer according to claim 19 having a sealing initiation temperature (SIT) and density (D) satisfying the relationship
SIT≤( A×D )− B

wherein A is 1200° C.×cm 3 /g and B is 1014° C. and preferably wherein A is 1700° C.×cm 3 /g and B is 1469° C.

22 . A copolymer according to claim 19 having a Compositional Distribution Branch Index (CDBI) in the range 65-85%,
and a sealing initiation temperature (SIT) and density (D) satisfying the relationship
SIT≤( A×D )− B

wherein A is 1200° C.×cm 3 /g and B is 1014° C. and preferably wherein A is 1700° C.×cm 3 /g and B is 1469° C.

23 . A copolymer according to claim 19 having a density in the range 0.901-0.907 g/cm 3 .

24 . A copolymer according to claim 19 having a melt index MI 2 (2.16 kg, 190° C.) in the range of 0.05-5 g/10 min.

25 . A copolymer according to claim 19 having a sealing initiation temperature (SIT) <72° C. and preferably <65° C.

26 . A copolymer according to claim 19 having a Crystallizable Species Fraction below 55° C. (CSF55) ≥12% and preferably ≥15%.

27 . A copolymer according to claim 19 having a molecular weight distribution (Mw/Mn) greater than 3.4 and less than 4.5.

28 . A copolymer according to claim 19 wherein the alpha-olefin is 1-hexene.

29 . A copolymer according to claim 19 prepared by use of a metallocene catalyst system.

30 . A copolymer according to claim 29 wherein the metallocene catalyst system comprises a monocyclopentadienyl metallocene complex.

31 . A method for the preparation of copolymers of ethylene and alpha-olefins having
(a) a density (D) in the range 0.895-0.910 g/cm 3 , (b) a melt index MI 2 (2.16 kg, 190° C.) in the range of 0.01-6 g/10 min, (c) a Compositional Distribution Branch Index (CDBI) in the range 55-85%, and (d) a sealing initiation temperature (SIT) and density (D) satisfying the relationship
SIT≤( A×D )− B wherein A is 800° C.×cm 3 /g and B is 650° C.

wherein the SIT (° C.) is determined on a 70 μm film at 0.5N/15 mm and D is in units of g/cm 3 , said method comprising copolymerising ethylene and said alpha olefins in the presence of a catalyst system comprising a monocyclopentadienyl metallocene complex.

32 . A method according to claim 31 performed in the gas phase.

33 . A film comprising a copolymer of ethylene and an alpha-olefin having
(a) a density (D) in the range 0.895-0.910 g/cm 3 , (b) a melt index MI 2 (2.16 kg, 190° C.) in the range of 0.01-6 g/10 min, (c) a Compositional Distribution Branch Index (CDBI) in the range 55-85%, and (d) a sealing initiation temperature (SIT) and density (D) satisfying the relationship
SIT≤( A×D )− B wherein A is 800° C.×cm 3 /g and B is 650° C.

wherein the SIT (° C.) is determined on a 70 μm film at 0.5N/15 mm and D is in units of g/cm 3 .

34 . A film according to claim 33 exhibiting a hot tack strength equal to 3 N at a sealing temperature of ≤95° C. and most preferably ≤90° C.

35 . A multilayer film wherein at least one layer comprises a copolymer according to claim 19 .

36 . A copolymer according to claim 19 exhibiting a powder compressability (C) as follows:
% C <(− A×D )+ B

wherein D is the density in kg/m 3 and A=1 and B=928.

37 . A copolymer according to claim 36 wherein A=0.5 and B=468.

Assignees

• Ineos Europe Ag

Inventors

• Desportes Serge
• Ghouila Imen
• Lalanne-Magne Claudine
• Osmont Eric

Classifications

• C08F210/16 Primary

  Copolymers of ethene with alpha-alkenes, e.g. EP rubbers · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• C08J2323/08

  Copolymers of ethene (C08J2323/16 takes precedence) · CPC title

• C08F2420/02

  Cp or analog bridged to a non-Cp X anionic donor · CPC title

• C08F2410/01

  Additive used together with the catalyst, excluding compounds containing Al or B · CPC title