Patent US72496A successfully refreshed from Google Patents.
Patent US4963402A successfully refreshed from Google Patents.
US4963402A
Expired / Lapsed
US
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Films containing liquid crystalline polymers
Assignee: 3M Co
•
Filing: 1987-08-21
•
Granted: 1990-10-16
•
Expires: 2007-08-21
Abstract
Abstract A film comprising a combination of a thermotropic liquid crystalline polymer and a host polymer. The surface of the film comprises a plurality of discrete protrusions or peaks whose height can be tailored to provide a desired surface roughness.
Inventors
- 👤 Chiu P. Wong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:01
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: 44
Claim 1
Independent Claim
38 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 from about 0.01 to about 1 weight percent of said thermotropic liquid crystalline polymer.
Claim 2
Dependent Claim
38 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 from about 0.01 to about 1 weight percent of said thermotropic liquid crystalline polymer.
Claim 3
Dependent Claim
55 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 from about 0.01 to about 1 weight percent of said thermotropic liquid crystalline polymer and wherein said protrusions have a root means square average peak height of at least one nanometer.
Claim 4
Dependent Claim
55 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 from about 0.01 to about 1 weight percent of said thermotropic liquid crystalline polymer and wherein said protrusions have a root means square average peak height of at least one nanometer.
Claim 5
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 6
Dependent Claim
22 words
A film according to claim 3 wherein said protrusions have a root means square average peak height of greater than 8 nanometers.
Claim 7
Dependent Claim
23 words
A film according to claim 3 wherein said protrusions have a root mean square average peak height of from 5 to 80 nanometers.
Claim 8
Dependent Claim
23 words
A film according to claim 5 wherein said protrusions have a root mean square average peak height of from 5 to 30 nanometers.
Claim 9
Dependent Claim
23 words
A film according to claim 1 comprising from about 0.04 weight per cent to about 1 weight percent of said liquid crystalline polymer.
Claim 10
Dependent Claim
15 words
A film according to claim 7 having a coefficient of friction of 0.8 or less.
Claim 11
Dependent Claim
15 words
A film according to claim 8 having a coefficient of friction of 0.5 or less.
Claim 12
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 13
Dependent Claim
17 words
A film according to claim 7 comprising about 1 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 decompositions 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 14 wherein substantially all of said globular regions are between 0.2 and 20 microns in size.
Claim 18
Dependent Claim
20 words
A film according to claim 15 wherein substantially all of said globular regions are beneath the surface of said film.
Claim 19
Dependent Claim
27 words
A film according to claim 1 wherein said thermotropic liquid crystalline polymer is selectee from the group consisting of an aromatic polyester and an aromatic polyester amide.
Claim 20
Dependent Claim
53 words
A film according to claim 17 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
28 words
A film according to claim 1 wherein said thermotropic liquid crystalline polymer is selected from the groups consisting of a wholly aromatic polyester and a wholly aromatic polyesteramide.
Claim 22
Dependent Claim
29 words
A film according to claim 19 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
17 words
A composite structure comprising a support bearing on its first surface a film according to claim 1.
Claim 29
Dependent Claim
24 words
A film according to claim 26 wherein said support bears a layer of magnetic recording media on the surface opposed to said first surface.
Claim 30
Dependent Claim
21 words
A film according to claim 1 containing from about 0.04 to about 0.5 weight percent of said thermotropic liquid crystalline polymer.
Claim 31
Dependent Claim
28 words
A film according to claim 1 wherein substantially all of said protrusions comprise a layer of said host polymer over said regions of said thermotropic liquid crystalline polymer.
Claim 32
Dependent Claim
22 words
A film according to claim 1 wherein said thermotropic liquid crystalline polymer is at most only partially reacted with said host polymer.
Claim 33
Dependent Claim
20 words
A film according to claim 1 wherein said thermotropic liquid crystalline polymer is substantially non reacted with said host polymer.
Claim 34
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 35
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 36
Independent Claim
73 words
A method of tailoring the surface roughness of a film comprising the steps of mixing and heating from about 0.01 to about 1 weight percent of a thermotropic liquid crystalline polymer with from about 99.99 to about 99 weight percent of 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 37
Independent Claim
73 words
A method of tailoring the surface roughness of a film comprising the steps of mixing and heating from about 0.01 to about 1 weight percent of a thermotropic liquid crystalline polymer with from about 99.99 to about 99 weight percent of 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 38
Dependent Claim
26 words
A method according to claim 33 wherein said mixture is coextruded as a top layer onto a carrier layer free from said thermotropic liquid crystalline polymer.
Claim 39
Dependent Claim
57 words
A film of a host polymer and from about 0.01 percent by weight to about 1 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 40
Dependent Claim
57 words
A film of a host polymer and from about 0.01 percent by weight to about 1 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 41
Dependent Claim
71 words
A film having a surface layer which has a series of protrusions therefrom resulting from the presence of discrete globular regions of a thermotropic liquid crystalline polymer in a host polymer, wherein (a) said thermotropic liquid crystalline polymer comprises from about 0.01 to about 1 weight percent of said surface layer, and (b) said globular regions have a low aspect ratio and are between 0.2 and 20 microns in major axis.
Claim 42
Dependent Claim
71 words
A film having a surface layer which has a series of protrusions therefrom resulting from the presence of discrete globular regions of a thermotropic liquid crystalline polymer in a host polymer, wherein (a) said thermotropic liquid crystalline polymer comprises from about 0.01 to about 1 weight percent of said surface layer, and (b) said globular regions have a low aspect ratio and are between 0.2 and 20 microns in major axis.
Claim 43
Dependent Claim
81 words
A polyester film having at lest one surface having an irregular surface resulting from a plurality of protrusions each having a root mean square average peak height of at least one nanometer, said protrusions resulting from the presence of from about 0.01 to about 1 percent by weight of said film of a thermotropic liquid crystalline polymer (LCP), and wherein said LCP is present as discrete globular regions in said film, substantially all of said regions being encapsulated by said polyester.
Claim 44
Dependent Claim
81 words
A polyester film having at lest one surface having an irregular surface resulting from a plurality of protrusions each having a root mean square average peak height of at least one nanometer, said protrusions resulting from the presence of from about 0.01 to about 1 percent by weight of said film of a thermotropic liquid crystalline polymer (LCP), and wherein said LCP is present as discrete globular regions in said film, substantially all of said regions being encapsulated by said polyester.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-15 | 1994-04-16 | 1994-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-15 | 1998-04-16 | 1998-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-15 | 2002-04-16 | 2002-10-16 | $7700.00 | Window Closed / Lapsed |