US3983289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically insulating prepreg
Assignee: Mitsubishi Chemical Corp
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Filing: 1974-04-09
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Granted: 1976-09-28
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Expires: 1994-04-09
Abstract
Abstract An electrically insulating prepreg which comprises a resin composition of an alicyclic epoxy compound prepared by the expoxidation of an alkadiene alcohol ester of an alicyclic polybasic carboxylic acid, a latent curing agent, and a solid substrate, wherein said resin composition, once it has been applied to the substrate, is in the B-stage cured state and is thereby acetone soluble, thermoplastic and nontacky.
Inventors
- 👤 Syunichiro Nishizaki
- 👤 Hiroshi Teratani
- 👤 Osamu Fujisawa
- 👤 Jiro Fukushima
- 👤 Makoto Tokizawa
- 👤 Nobukatsu Wakabayashi
- 👤 Takashi Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:15
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; B32B38/00; B32B38/0036; C; C07; C07D; C07D303/00; C07D303/02; C07D303/12; C07D303/16; C07D303/38; C07D303/40; C07D303/44; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/24; C08J; C08J5/00; C08J5/24; C08J5/241; C08J5/244; C08J5/245; H; H01; H01B; H01B19/00; H01B3/00; H01B3/18; H01B3/30; H01B3/40; B29; B29L; B29L2031/00; B29L2031/34; B29L2031/3412; B32B2038/0052; B32B2038/0076; C08J2363/00; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/251; Y10T428/31504; Y10T428/31511; Y10T428/31525; Y10T442/00; Y10T442/20; Y10T442/2475
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
83 words
An electrically insulating prepreg, which comprises: a resin composition of an alicyclic epoxy compound prepared by the epoxidation of an alkadiene alcohol ester of an alicyclic polybasic carboxylic acid, wherein said alkadiene alcohol is 2,7-octadienol-1 or 1,7-octadienol-3, a latent curing agent of a Lewis acid amine complex, and a fibrous solid substrate or sheet like solid substrate, wherein said resin composition once it has been applied to said substrate is in the B-stage cured condition and is thereby acetone soluble, thermoplastic and non-tacky.
Claim 2
Dependent Claim
83 words
An electrically insulating prepreg, which comprises: a resin composition of an alicyclic epoxy compound prepared by the epoxidation of an alkadiene alcohol ester of an alicyclic polybasic carboxylic acid, wherein said alkadiene alcohol is 2,7-octadienol-1 or 1,7-octadienol-3, a latent curing agent of a Lewis acid amine complex, and a fibrous solid substrate or sheet like solid substrate, wherein said resin composition once it has been applied to said substrate is in the B-stage cured condition and is thereby acetone soluble, thermoplastic and non-tacky.
Claim 3
Dependent Claim
25 words
The electrically insulating prepreg of claim 1, wherein the latent curing agent is metal salt complex of imidazole or an organic acid salt or imidazole.
Claim 4
Dependent Claim
16 words
The electrically insulating prepreg of claim 1, wherein said fibrous substrate is glass cloth or paper.
Claim 5
Dependent Claim
18 words
The electrically insulating prepreg of claim 1, wherein said sheet-like substrate is a mica wrapper or mica paper.
Claim 6
Dependent Claim
31 words
The electrical insulating prepreg of claim 1, wherein 0.1 - 20 parts by weight of the latent curing agent is combined with 100 parts by weight of the alicyclic epoxy resin.
Claim 7
Dependent Claim
29 words
The electrically insulating prepreg of claim 1, wherein the alicyclic polybasic carboxylic acid is a phthalic acid compound selected from the group consisting of tetrahydrophthalic acid and hexahydrophthalic acid.
Claim 8
Dependent Claim
32 words
The electrically insulating prepreg of claim 6, wherein said alicyclic epoxy compound has an epoxy value of 0.3 - 0.9 mole equivalent and a hydroxy value of 0 - 0.2 mole equivalent.
Claim 9
Dependent Claim
43 words
The electrically insulating prepreg of claim 1, wherein the resin composition comprises the alicyclic epoxy compound prepared by the epoxidation of an alkadiene alcohol ester of an alicyclic polybasic carboxylic acid, a phenoxy resin and the latent curing agent with said solid substrate.
Claim 10
Dependent Claim
31 words
The electrically insulating prepreg of claim 1, wherein said resin composition further comprises an alicyclic epoxy compound containing at least one epoxy group situated in a 5 or 6 membered ring.
Claim 11
Dependent Claim
21 words
The electrically insulating prepreg of claim 1, wherein said resin composition further comprises an alicyclic epoxy compound containing a glycidyl group.
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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) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |