US4617370A
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Thermotropic liquid crystalline polymers
Assignee: Dow Chemical Co
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Filing: 1986-01-30
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Granted: 1986-10-14
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Expires: 2006-01-30
Abstract
Abstract Thermotropic polymers containing ester linkages and having liquid crystalline properties in the molten state are prepared with certain aromatic diols, such as tetramethyl dihydroxy biphenyls having halogen substituents meta to the oxygen atoms.
Inventors
- 👤 Robert W. Lenz
- 👤 Dean T. Behm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:22
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/02; C08G63/60; C08G63/605
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
124 words
A thermotropic polymer capable of forming an anisotropic melt, the polymer comprising at least one recurring unit selected from each of the following groups: (a) a remnant of at least one aromatic dicarboxylic acid; (b) aromatic dioxy moieties of the formula: ##STR3## wherein each R independently is phenyl or lower alkyl or lower alkoxy of up to about four carbon atoms, and each X independently is a moiety which will electrophilically substitute into the position depicted for X in the formula, with the proviso that at least one X is not H; and (c) a remnant of at least one hydroxyaromatic carboxylic acid; the units being selected such that the polymer has a melting point of from about 250° C. to about 400° C.
Claim 2
Dependent Claim
124 words
A thermotropic polymer capable of forming an anisotropic melt, the polymer comprising at least one recurring unit selected from each of the following groups: (a) a remnant of at least one aromatic dicarboxylic acid; (b) aromatic dioxy moieties of the formula: ##STR3## wherein each R independently is phenyl or lower alkyl or lower alkoxy of up to about four carbon atoms, and each X independently is a moiety which will electrophilically substitute into the position depicted for X in the formula, with the proviso that at least one X is not H; and (c) a remnant of at least one hydroxyaromatic carboxylic acid; the units being selected such that the polymer has a melting point of from about 250° C. to about 400° C.
Claim 3
Dependent Claim
18 words
The polymer of claim 1 wherein each X independently is Cl, Br, F, alkyl, H, sulfonate, or acyl.
Claim 4
Dependent Claim
15 words
The polymer of claim 2 wherein each X independently is H, Cl, Br or F.
Claim 5
Dependent Claim
13 words
The polymer of claim 3 wherein each X independently is H or Br.
Claim 6
Dependent Claim
13 words
The polymer of claim 4 wherein at least two X moieties are Br.
Claim 7
Dependent Claim
13 words
The polymer of claim 4 wherein at least three X moieties are Br.
Claim 8
Dependent Claim
10 words
The polymer of claim 5 wherein each X is Br.
Claim 9
Dependent Claim
9 words
An anisotropic melt of the polymer of claim 4.
Claim 10
Dependent Claim
31 words
The polymer of claim 1 wherein the remnant of the hydroxyaromatic carboxylic acid is represented by the formula: ##STR4## with the proviso that the phenyl ring optionally can bear inert substituents.
Claim 11
Dependent Claim
35 words
The polymer of claim 1 wherein the remnant of the dicarboxylic acid is represented by the formula: ##STR5## with the proviso that the ring carbonyl substituents be meta or para with respect to each other.
Claim 12
Dependent Claim
9 words
An anisotropic melt of the polymer of claim 1.
Claim 13
Dependent Claim
76 words
A thermotropic polymer capable of forming an anisotropic melt, the polymer being represented generally by the formula: ##STR6## wherein the sum of n and m is one, each R independently is lower alkyl or lower alkoxy of up to about four carbon atoms, or phenyl, and each X independently is a moiety which will electrophilically substitute into the position depicted for X in the formula, with the proviso that at least one X is not H.
Claim 14
Dependent Claim
76 words
A thermotropic polymer capable of forming an anisotropic melt, the polymer being represented generally by the formula: ##STR6## wherein the sum of n and m is one, each R independently is lower alkyl or lower alkoxy of up to about four carbon atoms, or phenyl, and each X independently is a moiety which will electrophilically substitute into the position depicted for X in the formula, with the proviso that at least one X is not H.
Claim 15
Dependent Claim
12 words
The polymer of claim 12 wherein n is at least about 0.5.
Claim 16
Dependent Claim
14 words
The polymer of claim 13 wherein n is from about 0.5 to about 0.9.
Claim 17
Dependent Claim
13 words
The polymer of claim 14 wherein at least two X moieties are Br.
Claim 18
Dependent Claim
13 words
The polymer of claim 14 wherein at least three X moieties are Br.
Claim 19
Dependent Claim
10 words
The polymer of claim 14 wherein each X is Br.
Claim 20
Dependent Claim
10 words
The polymer of claim 17 wherein each R is methyl.
Claim 21
Dependent Claim
18 words
The polymer of claim 12 having a melting point of from about 250° C. to about 400° C.
Claim 22
Dependent Claim
46 words
A thermotropic polymer capable of forming an anisotropic melt, the polymer comprising ester linkages and at least one recurring unit derived from a polysubstituted, tetraalkyl biphenol having at least one non-hydrogen substituent in a meta position relative to an oxygen atom on the same aromatic ring.
Claim 23
Dependent Claim
46 words
A thermotropic polymer capable of forming an anisotropic melt, the polymer comprising ester linkages and at least one recurring unit derived from a polysubstituted, tetraalkyl biphenol having at least one non-hydrogen substituent in a meta position relative to an oxygen atom on the same aromatic ring.
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