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US4921928A Expired / Lapsed US ⏱️ 0.0 years remaining

Piezoelectric polymer materials from epoxy resins and polytetramethyleneoxide-di-p-aminobenzoate

Assignee: TOYOKAKO KK
•
Filing: 1988-06-17
•
Granted: 1990-05-01
•
Expires: 2008-06-17
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Abstract

Abstract A piezoelectric polymer material comprising a cured product of a composition comprised of an epoxy resin having at least two epoxy groups in the molecules, a compound having a molecular weight not less than 1200 and containing defined numbers of amino groups, benzene rings, carbonyl groups and methylene groups, and a crosslinking agent. The cured product has dipolarly oriented micro crystals therein. A method for making such a piezoelectric polymer material is also described, in which the resin composition is thermally cured and contacted with an electric field at a high temperature to cause dipolar orientation in the product. The dipoles are frozen by cooling the product while applying the electric field.

Inventors

  • 👤 Katsumi Tanino
  • 👤 Morihito Kakada

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-06 12:15
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/504; C08G59/5046; C08G59/5053; C08L; C08L63/00; H; H10; H10N; H10N30/00; H10N30/01; H10N30/09; H10N30/098; H10N30/80; H10N30/85; H10N30/857

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 72 words
A piezoelectric polymer material which comprises: a cured product made from (1) an epoxy resin having at least two epoxy groups; (2) a compound having, at least two amino groups, at least two benzene rings, at least two carbonyl groups and at least 52 methylene groups and having a molecular weight not less than 1200; and (3) a crosslinking agent for the epoxy resin, said cured product having dipolarly oriented microcrystals therein.
Claim 2
Dependent Claim 72 words
A piezoelectric polymer material which comprises: a cured product made from (1) an epoxy resin having at least two epoxy groups; (2) a compound having, at least two amino groups, at least two benzene rings, at least two carbonyl groups and at least 52 methylene groups and having a molecular weight not less than 1200; and (3) a crosslinking agent for the epoxy resin, said cured product having dipolarly oriented microcrystals therein.
Claim 3
Dependent Claim 40 words
A piezoelectric polymer material according to claim 1, wherein the at least two amino groups, the at least two benzene rings, the at least two carbonyl groups and the at least 52 methylene groups of compound (2) are arranged linearly.
Claim 4
Dependent Claim 14 words
A piezoelectric polymer material according to claim 1, wherein compound (2) i s polytetramethyleneoxide-di-p-aminobenzoate.
Claim 5
Dependent Claim 23 words
A piezoelectric polymer material according to claim 1, wherein said crosslinking agent is a mixture of an imidazole derivative and a pyridine derivative.
Claim 6
Dependent Claim 45 words
A piezoelectric polymer material according to claim 1, wherein said cured product is made of 100 parts by weight of said epoxy resin, from (70) to (85) parts by weight of said compound, and from (10) to (30) parts by weight of said crosslinking agent.

References Cited (Backward Citations)

US3486925A Cited
US3577386A Cited
US3580887A Cited
US4826616A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1993-04-30 1993-10-30 1994-05-01 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1997-04-30 1997-10-30 1998-05-01 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2001-04-30 2001-10-30 2002-05-01 $7700.00 Window Closed / Lapsed

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