EP0423402A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Thermoplastic polymeric film
Assignee: Teijin Ltd
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Filing: 1989-10-17
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Granted: —
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Expires: 2009-10-17
Abstract
Abstract A thermoplastic polymeric film having a thickness of 0.1 to 4 micrometers prepared from an intimate mixture comprising (A) 100 parts by weight of a thermoplastic polymer, (B) 0.01 to 3 parts by weight of inert secondary agglomerated inorganic particles having an average particle diameter of 0.05 to 5 micrometers and a void ratio of 50 to 95 % which are aggregates of primary fine particles having an average particle diameter of 30 to 500 angstrom, and (C) 0.005 to 1 part by weight of spherical primary particles selected from silica particles, silicone resin particles, crosslinked polystyrene resin particles and crosslinked acrylic resin particles, and having an average particle diameter of 0.05 to 4 micrometers and an aspect ratio of from 1.0 to 1.2.
Inventors
- 👤 Kotaro Katoh
- 👤 Hiroshi Tomita
- 👤 Kazuyoshi Saitoh
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 13:22
CPC Classifications
B; B41; B41N; B41N1/00; B41N1/24; B41N1/245; C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/34; C08K3/36; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; C08K2201/00; C08K2201/016
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
123 words
A thermoplastic polymeric film 0.1 to 4 micrometers thick of an intimate mixture comprising (A) 100 parts by weight of a thermoplastic polymer, (B) 0.01 to 3 parts by weight of inert secondary agglomerated inorganic particles having an average particle diameter of 0.05 to 5 micrometers and a void ratio of 50 to 95% which are aggregates of primary fine particles having an average particle diameter of 3 to 50 nm (30 to 500 Angstrom), and (C) 0.005 to 1 part by weight of spherical primary particles selected from silica particles, silicone resin particles, crosslinked polystyrene resin particles and crosslinked acrylic resin particles, and having an average particle diameter of 0.05 to 4 micrometers and an aspect ratio of from 1.0 to 1.2.
Claim 2
Dependent Claim
123 words
A thermoplastic polymeric film 0.1 to 4 micrometers thick of an intimate mixture comprising (A) 100 parts by weight of a thermoplastic polymer, (B) 0.01 to 3 parts by weight of inert secondary agglomerated inorganic particles having an average particle diameter of 0.05 to 5 micrometers and a void ratio of 50 to 95% which are aggregates of primary fine particles having an average particle diameter of 3 to 50 nm (30 to 500 Angstrom), and (C) 0.005 to 1 part by weight of spherical primary particles selected from silica particles, silicone resin particles, crosslinked polystyrene resin particles and crosslinked acrylic resin particles, and having an average particle diameter of 0.05 to 4 micrometers and an aspect ratio of from 1.0 to 1.2.
Claim 3
Dependent Claim
16 words
A film according to claim 1 in which the thermoplastic polymer (A) is an aromatic polyester.
Claim 4
Dependent Claim
18 words
A film according to claim 2 in which the aromatic polyester is polyethylene-2,6-naphthalene diacarbox- ylate or polyethylene terephthalate.
Claim 5
Dependent Claim
25 words
A film according to claim 1, 2 or 3 in which the secondary agglomerated inorganic particles (B) are of alumina, silica, silica-alumina, titania or zirconia.
Claim 6
Dependent Claim
28 words
A film according to any one of the preceding claims in which the secondary agglomerated inorganic particles (B) have an average particle diameter of 0.1 to 4 micrometers.
Claim 7
Dependent Claim
26 words
A film according to any one of the preceding claims in which the secondary agglomerated inorganic particles (B) have a void percentage of 60 to 90%.
Claim 8
Dependent Claim
28 words
A film according to any one of the preceding claims in which the amount of the secondary agglomerated inorganic particles (B) is 0.05 to 2 parts by weight.
Claim 9
Dependent Claim
27 words
A film according to any one of the preceding claims in which the spherical primary particles (C) have an average particle diameter of 0.2 to 3 micrometers.
Claim 10
Dependent Claim
26 words
A film according to any one of the preceding claims in which the spherical primary particles (C) have an aspect ratio of from 1.0 to 1.15.
Claim 11
Dependent Claim
27 words
A film according to any one of the preceding claims in which the amount of the spherical primary particles (C) is 0.01 to 0.8 part by weight.
Claim 12
Dependent Claim
110 words
A film according to any one of the preceding claims in which the spherical primary particles (C) have a relative standard deviation (8) of particle size, defined by the following equation wherein D ; is the diameter (µm) of the equivalent circular area of each of the particles, D is an average value (µm) of the diameter of the equivalent circular area defined by the following equation and n is the number of the particles, with the proviso that the diameter of the equivalent circular area denotes the diameter of each particle calculated when it is assumed that each particle is of a true spherical shape, of up to 0.5.
Claim 13
Dependent Claim
17 words
A film according to any one of the preceding claims which is 0.2 to 3 micrometers thick.
Claim 14
Dependent Claim
39 words
Use of a film as claimed in any one of the preceding claims as a dielectric material of a film capacitor, as a master sheet for thermosensitive screen printing or as a receptor material for a thermal transfer printer.
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