Extruded capacitor films with high temperature performance, methods of manufacture, and articles containing the same

Patent metadata

Field	Value
Publication number	US-2022010129-A1
Application number	US-201917293574-A
Country	US
Kind code	A1
Filing date	Nov 14, 2019
Priority date	Nov 14, 2018
Publication date	Jan 13, 2022
Grant date	—

Abstract

A composition includes 65.0-99.85 wt % of a high heat copolycarbonate, the high heat copolycarbonate further having a number ratio of carbon atoms to a total of hydrogen, oxygen, and fluorine atoms of less than 1.12, preferably from 0.83 to less than 1.12; 0.05-0.5 wt % of a first roughening agent; and 0.1-15.0 wt % of an organic slip agent, wherein the organic slip agent comprises pentaerythritol tetrastearate, dipentaerythritol hexastearate, glycerol tristearate, high density poly(ethylene), polymethylpentene, a poly(carbonate-siloxane), or a combination thereof; wherein each amount is based on the total weight of the composition and totals 100 wt %.

First claim

1 . A composition, comprising:
65.0-99.85 wt % of a high heat copolycarbonate comprising
low heat bisphenol groups derived from a low heat monomer where the corresponding homopolycarbonate of the monomer has a Tg of lower than 155° C., determined according to ASTM E1640-13 with a 1° C./min heating rate and
high heat bisphenol groups derived from a high heat bisphenol monomer where the corresponding homopolycarbonate of the monomer has a Tg of 155° C. or higher, determined according to ASTM E1640-13 with a 1° C./min heating rate,
the high heat copolycarbonate further having a number ratio of carbon atoms to a total of hydrogen, oxygen, and fluorine atoms of less than 1.12;
0.1-15.0 wt % of an organic slip agent, wherein the organic slip agent comprises pentaerythritol tetrastearate, dipentaerythritol hexastearate, glycerol tristearate, high density poly(ethylene), polymethylpentene, a poly(carbonate-siloxane), or a combination thereof; and 0.05-0.5 wt % of a roughening agent comprising a particulate, crosslinked silicone;
wherein each amount is based on the total weight of the composition and totals 100 wt %.

2 . The composition of claim 1 , wherein the roughening agent comprises a polymethylsilsesquioxane having a mean particle diameter of 0.5-2.5 μm as determined by scanning electron microscopy.

3 . The composition of claim 1 , wherein the high heat copolycarbonate has a glass transition temperature of 170-250° C. determined according to ASTM E1640-13 with a 1° C./min heating rate.

4 . The composition of claim 1 , wherein the high heat copolycarbonate is an N-phenylphenolphthaleinylbisphenol-bisphenol A copolycarbonate, a 3,3,5-trimethylcyclohexanone bisphenol-bisphenol A copolycarbonate, or a combination thereof.

5 . The composition of claim 1 , wherein the organic slip agent comprises
0.1-1 wt % of the pentaerythritol tetrastearate, and 3.0-10 wt. % of the poly(carbonate-siloxane).

6 . The composition of claim 1 , comprising
65.0-99.85 wt % of a high heat copolycarbonate comprising an N-phenylphenolphthaleinylbisphenol-bisphenol A copolycarbonate, a 3,3,5-trimethylcyclohexanone bisphenol-bisphenol A copolycarbonate, or a combination thereof, 0.1-1 wt % of the pentaerythritol tetrastearate, 3.0-10 wt. % of the poly(carbonate-siloxane), and 0.05-0.5 wt % of a particulate polymethylsilsesquioxane roughening agent having a mean particle diameter of 0.5-2.5 μm as determined by scanning electron microscopy;
wherein each amount is based on the total weight of the composition and totals 100 wt %.

7 . The composition of claim 1 , further comprising a second roughening agent in an amount of 2.0-10.0 wt %, based on the total weight of the composition, wherein the second roughening agent comprises a cyclic olefin copolymer.

8 . The composition of claim 1 , further comprising a bisphenol A homopolymer in an amount of 1.0-50.0 wt %, based on the total weight of the composition.

9 . The composition of claim 1 , further comprising an antioxidant in an amount of 0.02-0.06 wt %, based on the total weight of the composition.

10 . An extruded film comprising the composition of claim 1 .

11 . The extruded film of claim 10 , having a thickness of 1-10 μm.

12 . The extruded film of claim 10 , having a breakdown strength of greater than 700 V per μm as determined in accordance with ASTM D149 using a ball electrode.

13 . The extruded film of claim 10 , wherein the film has at least one of the following properties:
a glass transition temperature of 170-250° C. determined in accordance with ASTM E1640-13; a Bosch Test clearing count of 0-10 at 300 V/μm; a dielectric constant of greater than 2.5; and a dissipation factor of less than 1.0%.

14 . A capacitor, comprising
the extruded film of claim 10 ; and an electrically conductive metal layer in contact with the film.

15 . An electronic device comprising the capacitor of claim 14 .

Assignees

• Shpp Global Tech Bv

Inventors

• Mahood James Alan
• Niemeyer Matthew Frank

Classifications

• H01G4/33

  Thin- or thick-film capacitors {(thin- or thick-film circuits; capacitors without a potential-jump or surface barrier specially adapted for integrated circuits, details thereof, multistep manufacturing processes therefor)} · CPC title

• C08L83/04

  Polysiloxanes · CPC title

• C08L2201/08

  Stabilised against heat, light or radiation or oxydation · CPC title

• C08J2369/00

  Characterised by the use of polycarbonates; Derivatives of polycarbonates · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title