Sealing propylene copolymer

Patent metadata

Field	Value
Publication number	US-9243137-B2
Application number	US-201213984245-A
Country	US
Kind code	B2
Filing date	Feb 7, 2012
Priority date	Feb 14, 2011
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

Propylene copolymer composition comprising a propylene copolymer (A) having a comonomer content in the range of equal or more than 0.5 to equal or below 2.0 wt.-%, the comonomers are C5 to C12 α-olefins, and a propylene copolymer (B) having a comonomer content in the range of equal or more than 4.0 to equal or below 10.0 wt.-%, the comonomers are C5 to C12 α-olefins, wherein further the propylene copolymer composition has a comonomer content in the range of equal or more than 3.5 to equal or below 7.0 wt.-%, the comonomers are C5 to C12 α-olefins, and the weight ratio of the propylene copolymer (A) to the propylene copolymer (B) is in the range of 20/80 to below 55/45.

First claim

The invention claimed is:

1. Propylene copolymer composition (P) comprising:
(a) a propylene copolymer (A) having a comonomer content in the range of equal or more than 0.5 to equal or below 2.0 wt. %, the comonomers are C 5 to C 12 α-olefins and a MFR 2 (230° C.) measured according to ISO 1133 in the range of 1.0 to 5.0 g/10 min, and
(b) a propylene copolymer (B) having a comonomer content in the range of equal or more than 4.0 to equal or below 10.0 wt. %, the comonomers are C 5 to C 12 α-olefins and a melt flow rate MFR 2 (230° C.) measured according to ISO 1133 in the range of 5.5 to 50.0 g/10 min,
wherein further
(i) the propylene copolymer composition (P) has a comonomer content in the range of equal or more than 3.5 to equal or below 7.0 wt. %, the comonomers are C 5 to C 12 α-olefins,
(ii) the polypropylene copolymer composition (P) has a melt flow rate MFR 2 (230° C.) measured according to ISO 1133 in the range of 3.0 to 20.0 g/10 min, and
(iii) the weight ratio of the propylene copolymer (A) to the propylene copolymer (B) is in the range of 20/80 to below 50/50.

2. Propylene copolymer composition (P) according to claim 1 , wherein the propylene copolymer composition (P) fulfills the equation (I):
Tm −SIT≧25° C.  (I)

wherein
Tm is the melting temperature given in centigrade [° C.] of the propylene copolymer composition (P); and
SIT is the heat sealing initiation temperature (SIT) given in centigrade [° C.] of the propylene copolymer composition (P).

3. Propylene copolymer composition (P) according to claim 1 , wherein the propylene copolymer composition (P) has a heat sealing initiation temperature (SIT) of equal or below 115° C.

4. Propylene copolymer composition (P) according to claim 1 , wherein the propylene copolymer composition (P) has a melting temperature Tm of at least 130° C.

5. Propylene copolymer composition (P) according to claim 1 , wherein the propylene copolymer composition (P) has a xylene soluble content (XCS) determined at 25° C. according to ISO 16152 of below 20.0 wt. %.

6. Propylene copolymer composition (P) according to claim 1 , wherein the comonomers are selected from the group of C 5 α-olefin, C 6 α-olefin, C 7 α-olefin, C 8 α-olefin, C 9 α-olefin, C 10 α-olefin, C 11 α-olefin and C 12 α-olefin.

7. Propylene copolymer composition (P) according to claim 1 , wherein the propylene copolymer (A) and/or propylene copolymer (B) comprise(s) 1-hexene as comonomer.

8. Propylene copolymer composition (P) according to claim 1 being provided as a film.

9. Propylene copolymer composition (P) according to claim 1 being provided as a coating on an extrusion coated substrate.

10. Process for the preparation of a propylene copolymer composition (P), wherein the process is a sequential polymerization process comprising at least two reactors connected in series, wherein said process comprises the steps of:
(A) polymerizing in a first reactor (R-1) being a slurry reactor (SR), propylene and at least one C 5 to C 12 α-olefin to obtain a propylene copolymer (A) as defined in claim 1 ,
(B) transferring said propylene copolymer (A) and unreacted comonomers of the first reactor in a second reactor (R-2) being a gas phase reactor (GPR-1),
(C) feeding to said second reactor (R-2) propylene and at least one of C 5 to C 12 α-olefin,
(D) polymerizing in said second reactor (R-2) and in the presence of said first propylene copolymer (A) propylene and at least one C 5 to C 12 α-olefin to obtain a propylene copolymer (B) as defined in claim 1 , said propylene copolymer (A) and said propylene copolymer (B) forming the propylene copolymer composition (P), wherein further
in the first reactor (R-1) and second reactor (R-2) the polymerization takes place in the presence of a solid catalyst system (SCS), said solid catalyst system (SCS) comprises
(i) a transition metal compound of formula (I)
R n ( Cp ′) 2 MX 2   (I)

wherein
“M” is zirconium (Zr) or hafnium (Hf),
each “X” is independently a monovalent anionic σ-ligand,
each “Cp′” is a cyclopentadienyl-type organic ligand independently selected from the group consisting of substituted cyclopentadienyl, substituted indenyl, substituted tetrahydroindenyl, and substituted fluorenyl, said organic ligands coordinate to the transition metal (M),
“R” is a bivalent bridging group linking said organic ligands (Cp′),
“n” is 1 or 2 and
(ii) optionally a cocatalyst (Co) comprising an element (E) of group 13 of the periodic table (IUPAC).

11. Process according to claim 10 , wherein the transition metal compound of formula (I) is an organo-zirconium compound of formula (II):

wherein
M is zirconium (Zr),
X are ligands with a σ-bond to the metal “M”,
R 1 are equal to or different from each other, and are selected from the group consisting of linear saturated C 1 to C 20 alkyl, linear unsaturated C 1 to C 20 alkyl, branched saturated C 1 to C 20 alkyl, branched unsaturated C 1 to C 20 alkyl, C 3 to C 20 cycloalkyl, C 6 to C 20 aryl, C 7 to C 20 alkylaryl, and C 7 to C 20 arylalkyl, optionally containing one or more heteroatoms of groups 14 to 16 of the Periodic Table (IUPAC),
R 2 to R 6 are equal to or different from each other and are selected from the group consisting of hydrogen, linear saturated C 1 -C 20 alkyl, linear unsaturated C 1 to C 20 alkyl, branched saturated C 1 to C 20 alkyl, branched unsaturated C 1 to C 20 alkyl, C 3 to C 20 cycloalkyl, C 6 to C 20 aryl, C 7 to C 20 alkylaryl, and C 7 to C 20 arylalkyl, optionally containing one or more heteroatoms of groups 14 to 16 of the Periodic Table (IUPAC),
R 7 and R 8 are equal to or different from each other and selected from the group consisting of hydrogen, linear saturated C 1 to C 20 alkyl, linear unsaturated C 1 to C 20 alkyl, branched saturated C 1 to C 20 alkyl, branched unsaturated C 1 to C 20 alkyl, C 3 to C 20 cycloalkyl, C 6 to C 20 aryl, C 7 to C 20 alkylaryl, C 7 to C 20 arylalkyl, optionally containing one or more heteroatoms of groups 14 to 16 of the Periodic Table (IUPAC), SiR 10 3 , GeR 10 3 , OR 10 , SR 10 and NR 10 2 , wherein
R 10 is selected from the group consisting of linear saturated C 1 to C 20 alkyl, linear unsaturated C 1 to C 20 alkyl, branched saturated C 1 to C 20 alkyl, branched unsaturated C 1 to C 20 alkyl, C 3 to C 20 cycloalkyl, C 6 to C 20 aryl, C 7 to C 20 alkylaryl, and C 7 to C 20 arylalkyl, optionally containing one or more heteroatoms of groups 14 to 16 of the Periodic Table (IUPAC), and/or
R 7 and R 8 being optionally part of a C 4 to C 20 carbon ring system together with the indenyl carbons to which they are attached, optionally one carbon atom can be substituted by a nitrogen, sulfur or oxygen atom,
R 9 are equal to or different from each other and are selected from the group consisting of hydrogen, linear saturated C 1 to C 20 alkyl, linear unsaturated C 1 to C 20 alkyl, branched saturated C 1 to C 20 alkyl, branched unsaturated C 1 to C 20 alkyl, C 3 to C 20 cycloalkyl, C 6 to C 20 aryl, C 7 to C 20 alkylaryl, C 7 to C 20 arylalkyl, OR 10 , and SR 10 ,
wherein
R 10 is defined as before,
L is a bivalent group bridging the two indenyl ligands, wherein,
R 11 is selected from the group consisting of H, linear saturated C 1 to C 20 alkyl, linear unsaturated C 1 to C 20 alkyl, branched saturated C 1 to C 20 alkyl, branched unsaturated C 1 to C 20 alkyl, C 3 to C 20 cycloalkyl,

Assignees

• Reichelt Kristin
• Resconi Luigi
• Paavilainen Juha
• Borealis Ag

Inventors

• Reichelt Kristin
• Resconi Luigi
• Paavilainen Juha

Classifications

• C08L23/14 Primary

  Copolymers of propene (C08L23/16 takes precedence) · CPC title

• C08L2203/162

  sealable films · CPC title

• C09D123/14

  Copolymers of propene (C09D123/16 takes precedence) · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• C08L2666/06

  Homopolymers or copolymers of unsaturated hydrocarbons; Derivatives thereof · CPC title