Patent US4983669A successfully refreshed from Google Patents.
US4983669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermosetting composition from maleimide, olefinic monomer and unsaturated polyester
Assignee: Sunoco Inc R&M
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Filing: 1989-03-01
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Granted: 1991-01-08
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Expires: 2009-03-01
Abstract
Abstract Thermosetting compositions comprise, (a) about 10% to about 60% of a polymerizable olefinic monomer such as styrene or vinyl toluene (b) from about 1 to about 40% of a maleimide of the formula: ##STR1## where R 1 and R 2 are independently selected from hydrogen or C 1-3 alkyl groups, and in which the phenyl group may be substituted with aliphatic, alicyclic, and aromatic groups and up to three halogen or hydroxyl groups, and (c) about 5% to about 89% unsaturated polyester. The compositions are useful for their electrical and heat resistant properties as molding compositions, for the impregnation of electrical coils and for encasing electrical components.
Inventors
- 👤 Virginia Piermattie
- 👤 George L. Brownell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:26
CPC Classifications
C; C08; C08F; C08F299/00; C08F299/02; C08F299/04; C08F299/0478
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
130 words
A thermosetting composition comprising (a) about 10 to about 60 percent by weight of a polymerizable ethylenically unsaturated monomer selected from vinyl substituted mononuclear aromatic hydrocarbons and halo and alkyl derivatives thereof, alkyl esters of alpha, beta-ethylenically unsaturated monocarboxylic acids and halo derivatives thereof, and allyl esters and ethers, (b) about 1 to about 40 percent by weight of ##STR3## where R 1 and R 2 are independently selected from hydrogen or C 1-3 alkyl groups, and in which the phenyl group may be substituted with aliphatic, alicyclic, and aromatic groups and up to three halogen or hydroxyl groups, and (c) about 5% to about 89% by weight unsaturated polyester prepared by polycondensation of polycarboxylic acid derivatives, one of which must be an alpha, beta-ethylenically unsaturated polycarboxylic acid, and polyols.
Claim 2
Dependent Claim
130 words
A thermosetting composition comprising (a) about 10 to about 60 percent by weight of a polymerizable ethylenically unsaturated monomer selected from vinyl substituted mononuclear aromatic hydrocarbons and halo and alkyl derivatives thereof, alkyl esters of alpha, beta-ethylenically unsaturated monocarboxylic acids and halo derivatives thereof, and allyl esters and ethers, (b) about 1 to about 40 percent by weight of ##STR3## where R 1 and R 2 are independently selected from hydrogen or C 1-3 alkyl groups, and in which the phenyl group may be substituted with aliphatic, alicyclic, and aromatic groups and up to three halogen or hydroxyl groups, and (c) about 5% to about 89% by weight unsaturated polyester prepared by polycondensation of polycarboxylic acid derivatives, one of which must be an alpha, beta-ethylenically unsaturated polycarboxylic acid, and polyols.
Claim 3
Dependent Claim
13 words
A composition of claim 1 wherein the polymerizable olefinic monomer comprises vinyl toluene.
Claim 4
Dependent Claim
12 words
A composition of claim 1 wherein the polymerizable olefinic monomer comprises styrene.
Claim 5
Dependent Claim
9 words
A composition of claim 1 wherein (b) is N-phenylmaleimide.
Claim 6
Dependent Claim
33 words
A thermosetting composition comprising, by weight, (a) about 10% to about 40% vinyl toluene, (b) about 1% to about 20% N-phenyl-maleimide, and (c) about 40% to about 89% of an unsaturated polyester resin.
Claim 7
Dependent Claim
33 words
A thermosetting composition comprising, by weight, (a) about 10% to about 40% vinyl toluene, (b) about 1% to about 20% N-phenyl-maleimide, and (c) about 40% to about 89% of an unsaturated polyester resin.
Claim 8
Dependent Claim
23 words
A cured composition of claim 5 having an improved heat distortion temperature under load as compared to a similar composition not containing N-phenylmaleimide.
Claim 9
Dependent Claim
31 words
A thermosetting composition comprising, by weight, (a) about 10% to about 40% styrene (b) about 1% to about 20% N-phenylmaleimide (c) about 40% to about 89% of an unsaturated polyester resin.
Claim 10
Dependent Claim
31 words
A thermosetting composition comprising, by weight, (a) about 10% to about 40% styrene (b) about 1% to about 20% N-phenylmaleimide (c) about 40% to about 89% of an unsaturated polyester resin.
Claim 11
Dependent Claim
21 words
A cured composition of claim 7 having an improved heat distortion temperature under load compared to a similar composition without N-phenylmaleimide.
Claim 12
Dependent Claim
18 words
A cured composition of claim 7 having improved dielectric strength stability compared to a similar composition without N-phenylmaleimide.
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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) | 1994-01-07 | 1994-07-09 | 1995-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-07 | 1998-07-09 | 1999-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-07 | 2002-07-09 | 2003-01-08 | $7700.00 | Window Closed / Lapsed |