US4933479A
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Crosslinked polyphosphazenes as piezoelectric materials
Assignee: Idemitsu Petrochemical Co Ltd
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Filing: 1989-10-26
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Granted: 1990-06-12
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Expires: 2009-10-26
Abstract
Abstract Piezoelectric materials characterized by consisting essentially of crosslinked polyphosphazenes obtained by bringing polyphosphazenes which have repeating structural units represented by the general formula [I] --NP(X).sub.a (Y).sub.b -- [I] (all the symbols are as defined in the appended claims) into oriented state in an electric field provided by applying high voltage on them and then crosslinking them under such conditions. Piezoelectric materials thus obtained display an excellent piezoelectric effect and, in addition, rubber elasticity.
Inventors
- 👤 Tadao Kotaka
- 👤 Keiichiro Adachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:06
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/857; Y; Y10; Y10S; Y10S310/00; Y10S310/80
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
99 words
A piezoelectric element comprising polyphosphazenes crosslinked in the oriented state in an electric field and having piezoelectric characteristics; said polyphosphazenes having repeating structural units represented by the following formula (I) --NP(X).sub.a (Y).sub.b -- (I) wherein a and b are real numbers and 1≦a≦2, 0≦b≦1 and a+b=2, X is a phenoxy group and Y is a halogenoalkoxy group having carbon numbers of 1 to 20 or an amino group, and a polymerization degree of at least 3; and said oriented state having been obtained by an applied high voltage to provide an electric field of from 0.1 to 20 kV/mm.
Claim 2
Dependent Claim
99 words
A piezoelectric element comprising polyphosphazenes crosslinked in the oriented state in an electric field and having piezoelectric characteristics; said polyphosphazenes having repeating structural units represented by the following formula (I) --NP(X).sub.a (Y).sub.b -- (I) wherein a and b are real numbers and 1≦a≦2, 0≦b≦1 and a+b=2, X is a phenoxy group and Y is a halogenoalkoxy group having carbon numbers of 1 to 20 or an amino group, and a polymerization degree of at least 3; and said oriented state having been obtained by an applied high voltage to provide an electric field of from 0.1 to 20 kV/mm.
Claim 3
Dependent Claim
17 words
The piezoelectric element of claim 1 wherein the polymerization degree of said polyphosphazenes is greater than 15.
Claim 4
Dependent Claim
24 words
The piezoelectric element as claimed in claim 1 wherein X is phenoxy group, Y is 2,2,2-trifluoroethoxy group, a is 1.8 and b is 0.2.
Claim 5
Dependent Claim
24 words
The piezoelectric element as claimed in claim 1 wherein X is phenoxy group, Y is 2,2,2-trifluoroethoxy group, a is 1 and b is 1.
Claim 6
Dependent Claim
19 words
The piezoelectric element as claimed in claim 1 wherein X is phenoxy, a is 2 and b is 0.
Claim 7
Dependent Claim
18 words
The piezoelectric element of claim 1 wherein the polymerization degree of said polyphosphazenes is from 50 to 10,000.
Claim 8
Dependent Claim
18 words
The piezoelectric element of claim 3 wherein the polymerization degree of said polyphosphazenes is from 50 to 10,000.
Claim 9
Dependent Claim
18 words
The piezoelectric element of claim 4 wherein the polymerization degree of said polyphosphazenes is from 50 to 10,000.
Claim 10
Dependent Claim
18 words
The piezoelectric element of claim 5 wherein the polymerization degree of said polyphosphazenes is from 50 to 10,000.
Claim 11
Dependent Claim
124 words
A process for producing a piezoelectric element consisting essentially of crosslinking polyphosphazenes having repeating structural units represented by the following formula (I) --NP(X).sub.a (Y).sub.b -- (I) wherein a and b are real numbers satisfying 1≦a≦2, 0≦b≦1 and a+b=2, X is phenoxy group and Y is a halogenoalkoxy group having carbon numbers of 1 to 20 or an amino group, and a polymerization degree of at least 3; comprising positioning said polyphosphazenes having repeated structural units represented by said formula (I) in an electric field of from 0.1 to 20 kV/mm provided by an applied high voltage to orient said polyphosphazenes and then crosslinking said polyphosphazenes at a temperature of 60° to 120° C. by use of a crosslinking agent while in said electric field.
Claim 12
Dependent Claim
124 words
A process for producing a piezoelectric element consisting essentially of crosslinking polyphosphazenes having repeating structural units represented by the following formula (I) --NP(X).sub.a (Y).sub.b -- (I) wherein a and b are real numbers satisfying 1≦a≦2, 0≦b≦1 and a+b=2, X is phenoxy group and Y is a halogenoalkoxy group having carbon numbers of 1 to 20 or an amino group, and a polymerization degree of at least 3; comprising positioning said polyphosphazenes having repeated structural units represented by said formula (I) in an electric field of from 0.1 to 20 kV/mm provided by an applied high voltage to orient said polyphosphazenes and then crosslinking said polyphosphazenes at a temperature of 60° to 120° C. by use of a crosslinking agent while in said electric field.
Claim 13
Dependent Claim
18 words
The process as claimed in claim 10 wherein the polymerization degree of said polyphosphazenes is greater than 15.
Claim 14
Dependent Claim
19 words
The process as claimed in claim 10 wherein the polymerization degree of said polyphosphazenes is from 50 to 10,000.
Claim 15
Dependent Claim
17 words
The process as claimed in claim 10 wherein said electric field is from 0.5 to 10 kV/mm.
Claim 16
Dependent Claim
16 words
The process as claimed in claim 10 wherein benzoyl peroxide is used as the crosslinking agent.
Claim 17
Dependent Claim
16 words
The process as claimed in claim 13 wherein benzoyl peroxide is used as the crosslinking agent.
Claim 18
Dependent Claim
19 words
The process as claimed in claim 13 wherein the polymerization degree of said polyphosphazenes is from 50 to 10,000.
Claim 19
Dependent Claim
19 words
The process as claimed in claim 14 wherein the polymerization degree of said polyphosphazenes is from 50 to 10,000.
Claim 20
Dependent Claim
19 words
The process as claimed in claim 15 wherein the polymerization degree of said polyphosphazenes is from 50 to 10,000.
References Cited (Backward Citations)
US4303733A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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