Process for the manufacture of a capacitor film

Patent metadata

Field	Value
Publication number	US-10253115-B2
Application number	US-201214240696-A
Country	US
Kind code	B2
Filing date	Aug 29, 2012
Priority date	Aug 30, 2011
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

Process for producing of a capacitor film comprising the steps of (a) polymerizing propylene in the presence of a catalyst comprising a solid catalyst system obtaining a polypropylene, (b) subjecting said polypropylene to a film forming process obtaining a capacitor film, wherein during the polymerization step (a) said catalyst comprising the solid catalyst system fragments into nanosized catalyst fragments being distributed in said polypropylene, said solid catalyst system comprises a transition metal, a metal which is selected from one of the groups 1 to 3 of the periodic table (IUPAC), and an internal electron donor.

First claim

The invention claimed is:

1. Process for producing a capacitor film comprising the steps of:
(a) polymerizing propylene and optionally ethylene and/or at least one C 4 to C10 α-olefin in the presence of a catalyst comprising a solid catalyst system (SCS) to obtain a polypropylene (PP),
(b) subjecting said polypropylene (PP) to a film forming process to obtain a capacitor film, wherein said polypropylene (PP) is the only polymer in the capacitor film,
wherein during the polymerization step (a) said catalyst comprising the solid catalyst system (SCS) fragments into nanosized catalyst fragments (F) being distributed in said polypropylene (PP), said solid catalyst system (SCS) comprises:
(i) a compound of a transition metal of the periodic table (IUPAC),
(ii) a compound of a metal selected from one of the groups 1 to 3 of the periodic table (IUPAC), and
(iii) an electron donor (E), and wherein the polypropylene is not subjected to a washing step and wherein the solid catalyst system (SCS) is obtained by:
(a) preparing a solution of a complex (C) of a metal which is selected from one of the groups 1 to 3 of the periodic table (IUPAC) and an electron donor (E), said complex (C) is obtained by reacting a compound (CM) of said metal with said electron donor (E) or a precursor (EP) thereof in an organic solvent,
(b) mixing said solution of complex (C) with a liquid transition metal compound (CT),
(c) obtaining thereby an emulsion of a continuous phase and an dispersed phase, said dispersed phase is in form of droplets and comprises the complex (C) and the transition metal compound (CT), and
(d) solidifying the droplets of the dispersed phase obtaining thereby the solid catalyst system (SCS).

2. Process according to claim 1 , wherein the polypropylene (PP):
(a) has <2,1> erythro regiodefects of equal or below 0.4 mol.-% determined by 13 C-NMR spectroscopy, and/or
(b) has a breakdown voltage at 100° C. of at least 350 AC/μm measured on a biaxially oriented polypropylene (BOPP) film made from said polypropylene (PP) at a draw ratio in machine direction and in transverse direction of 4.5×9.5, and/or
(c) fulfils the equation

(

P
⁢

⁢
75

-

P
⁢

⁢
110

)

P
⁢

⁢
75

×
100

≤
6.0

;

wherein
P75 is the permittivity measured at 50 Hz and 75° C.,
P110 is the permittivity measured at 50 Hz and 110° C.; and/or
(d) fulfils the equation

(

P
⁢

⁢
75

-

P
⁢

⁢
120

)

P
⁢

⁢
75

×
100

≤
12.0

;

wherein
P75 is the permittivity measured at 50 Hz and 75° C.,
P120 is the permittivity measured at 50 Hz and 120° C.; and/or
(e) fulfils the equation

(

D
⁢

⁢
75

-

D
⁢

⁢
110

)

D
⁢

⁢
75

×
100

≥

-
10.0

,

wherein
D75 is the dissipation (tan delta) measured at 50 Hz and 75′ C,
D110 is the dissipation (tan delta) measured at 50 Hz and 110° C.; and/or
(f) fulfils the equation

(

D
⁢

⁢
75

-

D
⁢

⁢
120

)

D
⁢

⁢
75

×
100

≥
10.0

,

wherein
D75 is the dissipation (tan delta) measured at 50 Hz and 75° C.;
D120 is the dissipation (tan delta) measured at 50 Hz and 120° C.

3. Process according to claim 1 , wherein the solid catalyst system (SCS)
(a) has a specific surface area measured according to ASTM D 3663 of le

Assignees

• Denifl Peter
• Jaaskelainen Pirjo
• Leinonen Timo
• Malm Bo
• Nymark Anders E
• Vestberg Torvald
• Borealis Ag

Inventors

• Denifl Peter
• Jaaskelainen Pirjo
• Leinonen Timo
• Malm Bo
• Nymark Anders E
• Vestberg Torvald

Classifications

• C08F210/16

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

• C08F4/6555

  and magnesium or compounds thereof · CPC title

• H01G4/32

  Wound capacitors · CPC title

• C08F210/06

  Propene · CPC title

• H01G4/14

  Organic dielectrics · CPC title