Patent EP0304153A2 successfully refreshed from Google Patents.
EP0304153A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Films containing liquid crystalline polymers
Assignee: 3M Co
•
Filing: 1988-07-08
•
Granted: —
•
Expires: 2008-07-08
Abstract
Abstract The object of the invention is to provide a film which has a tailorable surface roughness. The film comprises a thermotropic liquid crystalline polymer and a host polymer. The surface of the film comprises a plurality of discrete protrusions or peaks caused by the thermotropic liquid crystalline polymer whose height can be tailored to provide a desired surface roughness.
Inventors
- 👤 Chiu P. C/O Minnesota Mining & Wong
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 19:05
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C08G63/605; C08J; C08J5/00; C08J5/18; C09; C09K; C09K19/00; C09K19/52; C09K19/54; C09K19/542; C09K19/544; G; G11; G11B; G11B5/00; G11B5/62; G11B5/73; G11B5/739; G11B5/73923; G11B5/73927; G11B5/73931; C09K2323/00; C09K2323/03; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
35 words
A film having a surface which comprises protrusions resulting from regions of a thermotropic liquid crystalline polymer in a host polymer, said film containing at least 0.01 weight percent of said thermotropic liquid crystalline polymer.
Claim 2
Dependent Claim
35 words
A film having a surface which comprises protrusions resulting from regions of a thermotropic liquid crystalline polymer in a host polymer, said film containing at least 0.01 weight percent of said thermotropic liquid crystalline polymer.
Claim 3
Dependent Claim
22 words
A film according to claim 1 wherein said protrusions have a root mean square average peak height of at least one nanometer.
Claim 4
Dependent Claim
22 words
A film according to claim 2 wherein said protrusions have a root mean square average peak height of at least five nanometers.
Claim 5
Dependent Claim
22 words
A film according to claim 3 wherein said protrusions have a root mean square average peak height of greater than 8 nanometers.
Claim 6
Dependent Claim
22 words
A film according to claim 3 wherein said protrusions have a root mean square average peak height of 80 nanometers or less.
Claim 7
Dependent Claim
22 words
A film according to claim 5 wherein said protrusions have a root mean square average peak height of less than 30 nanometers.
Claim 8
Dependent Claim
17 words
A film according to claim 1 comprising at least 0.04 weight percent of said liquid crystalline polymer.
Claim 9
Dependent Claim
15 words
A film according to claim 7 having a coefficient of friction of 0.8 or less.
Claim 10
Dependent Claim
15 words
A film according to claim 8 having a coefficient of friction of 0.5 or less.
Claim 11
Dependent Claim
19 words
A film according to claim 7 comprising from 0.04 to 0.5 weight percent of said thermotropic liquid crystalline polymer.
Claim 12
Dependent Claim
18 words
A film according to claim 7 comprising at least 1 weight percent of said thermotropic liquid crystalline polymer.
Claim 13
Dependent Claim
18 words
A film according to claim 11 comprising at least 3 weight percent of said thermotropic liquid crystalline polymer.
Claim 14
Dependent Claim
25 words
A film according to claim 1 wherein said thermotropic liquid crystalline polymer has a melting temperature less than the decomposition temperature of said host polymer.
Claim 15
Dependent Claim
26 words
A film according to claim 1 wherein said thermotropic liquid crystalline polymer has a melting temperature greater than or equal to that of said host polymer.
Claim 16
Dependent Claim
19 words
A film according to claim 1 wherein said thermotropic liquid crystalline polymer comprises globular regions in said host polymer.
Claim 17
Dependent Claim
21 words
A film according to claim 15 wherein substantially all of said globular regions are between 0.2 and 10 microns in size.
Claim 18
Dependent Claim
20 words
A film according to claim 16 wherein substantially all of said globular regions are beneath the surface of said film.
Claim 19
Dependent Claim
16 words
A film according to claim 1 wherein said thermotropic liquid crystalline polymer comprises an aromatic polyester.
Claim 20
Dependent Claim
52 words
A film according to claim 18 wherein said thermotropic liquid crystalline polymer is selected from the group consisting of copolyesters of 4-hydroxybenzoic acid and 6-hydroxy naphthoic acid, copolyesters of oxybenzoate and ethylene terephthalate, copolyesters of p-oxybenzoate, p,p′biphenol and terephthalate, and copolyesters of p-oxybenzoate, hydroquinone and an aliphatic dicarboxylate with 2,2-bis(4-hydroxyphenyl)propate and isophthalate.
Claim 21
Dependent Claim
17 words
A film according to claim 19 wherein said thermotropic liquid crystalline polymer is a wholly aromatic polyester.
Claim 22
Dependent Claim
29 words
A film according to claim 20 wherein said wholly aromatic polyester is selected from polyesters of 4-hydroxybenzoic acid and 6-hydroxy naphthoic acid and copolyesters of p-oxybenzoate, p,p′biphenol and terephthalate.
Claim 23
Dependent Claim
55 words
A film according to claim 1 wherein said host polymer is selected from the group consisting of polyesters, polyamides, polycarbonates, polyolefins, acrylic polymers, vinyl chloride and vinylidene chloride based polymers, vinylidene fluoride based polymers, polystyrene, polyphenylene oxide polymers, polysulfones and polyether sulfones, polyketones and polyether ketones, polyoxymethylenes, thermoplastic cellulosic polymers and mixtures and copolymers thereof.
Claim 24
Dependent Claim
13 words
A film according to claim 1 which is free from inorganic slip agents.
Claim 25
Dependent Claim
7 words
An oriented film according to claim 1.
Claim 26
Dependent Claim
8 words
A heat set film according to claim 1.
Claim 27
Dependent Claim
16 words
A film according to claim 1 further comprising a layer of magnetic media on said surface.
Claim 28
Dependent Claim
31 words
A composite film comprising a support bearing on its first surface a layer having a plurality of protrusions resulting from regions of a thermotropic liquid crystalline polymer in a host polymer.
Claim 29
Dependent Claim
31 words
A composite film comprising a support bearing on its first surface a layer having a plurality of protrusions resulting from regions of a thermotropic liquid crystalline polymer in a host polymer.
Claim 30
Dependent Claim
24 words
A film according to claim 27 wherein said support bears a layer of magnetic recording media on the surface opposed to said first surface.
Claim 31
Dependent Claim
79 words
A film comprising (a) a substrate having at least one surface comprising a series of discrete peaks, said peaks having a root mean square average peak height of less than 30 nanometers, said peaks resulting from the presence of regions of from 0.04 to 0.5 weight percent of a wholly aromatic thermotropic liquid crystalline polymer and from 99.96 to 99.5 weight percent of a thermoplastic host polymer, and (b) a magnetic recording medium on said at least one surface.
Claim 32
Dependent Claim
79 words
A film comprising (a) a substrate having at least one surface comprising a series of discrete peaks, said peaks having a root mean square average peak height of less than 30 nanometers, said peaks resulting from the presence of regions of from 0.04 to 0.5 weight percent of a wholly aromatic thermotropic liquid crystalline polymer and from 99.96 to 99.5 weight percent of a thermoplastic host polymer, and (b) a magnetic recording medium on said at least one surface.
Claim 33
Independent Claim
55 words
A method of tailoring the surface roughness of a film comprising the steps of mixing and heating a thermotropic liquid crystalline polymer with a host polymer so as to provide identifiable regions of said thermotropic liquid crystalline polymer and said host polymer; forming a film of said mixture; and cooling said film to ambient temperature.
Claim 34
Independent Claim
55 words
A method of tailoring the surface roughness of a film comprising the steps of mixing and heating a thermotropic liquid crystalline polymer with a host polymer so as to provide identifiable regions of said thermotropic liquid crystalline polymer and said host polymer; forming a film of said mixture; and cooling said film to ambient temperature.
Claim 35
Dependent Claim
26 words
A method according to claim 30 wherein said mixture is coextruded as a top layer onto a carrier layer free from said thermotropic liquid crystalline polymer.
Claim 36
Dependent Claim
51 words
A film of a host polymer and at least 0.01 percent by weight of a thermotropic liquid crystalline polymer, said film having a surface substantially comprising said host polymer, said film further comprising a plurality of protrusions caused by the presence of discrete regions of said thermotropic liquid crystalline polymer therein.
Claim 37
Dependent Claim
51 words
A film of a host polymer and at least 0.01 percent by weight of a thermotropic liquid crystalline polymer, said film having a surface substantially comprising said host polymer, said film further comprising a plurality of protrusions caused by the presence of discrete regions of said thermotropic liquid crystalline polymer therein.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.