US4233413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resin composition with low shrinkage
Assignee: Resonac Corp
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Filing: 1978-11-28
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Granted: 1980-11-11
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Expires: 1998-11-28
Abstract
Abstract A resin composition comprising (A) 25 to 45 parts by weight of an unsaturated polyester having special structure, (B) 40 to 60 parts by weight of polymerizable monomer such as styrene, and (C) 4.5 to 15 parts by weight of a polystyrene, has low shrink properties and excellent electrical properties when molded, particularly by casting.
Inventors
- 👤 Noboru Monma
- 👤 Iwao Maekawa
- 👤 Tutomu Sarudate
- 👤 Hidetaka Sato
- 👤 Isao Uchigasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:51
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; H01B3/421; H01B3/425; C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/54; C08G63/553; C08G63/66; C08G63/668; C08G63/676; C08L; C08L67/00; C08L67/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
128 words
A resin composition having low shrink properties which comprises (A) 25 to 45 parts by weight of an unsaturated polyester containing tricyclo(5,2,1,0 2 ,6)dec-4-el-8 or 9-yl groups, alpha, betaunsaturated dibasic acid residues, and glycol residues as structural units, said unsaturated polyester being obtained by reacting, in equimolar amounts, dicyclopentadiene with an alpha, beta-unsaturated dibasic acid or by reacting, in equimolar amounts, dicyclopentadiene with an alpha, beta-unsaturated dibasic acid anhydride and water at 150° C. or lower to yield a partially esterified dicyclopentadienecarboxylic acid, which is further reacted with at least one polyhydric alcohol. (B) to 40 to 60 parts by weight of one or more polymerizable monomoers having one or more polymerizable double bonds in the molecule, and (C) 4.5 to 15 parts by weight of a polystyrene.
Claim 2
Dependent Claim
128 words
A resin composition having low shrink properties which comprises (A) 25 to 45 parts by weight of an unsaturated polyester containing tricyclo(5,2,1,0 2 ,6)dec-4-el-8 or 9-yl groups, alpha, betaunsaturated dibasic acid residues, and glycol residues as structural units, said unsaturated polyester being obtained by reacting, in equimolar amounts, dicyclopentadiene with an alpha, beta-unsaturated dibasic acid or by reacting, in equimolar amounts, dicyclopentadiene with an alpha, beta-unsaturated dibasic acid anhydride and water at 150° C. or lower to yield a partially esterified dicyclopentadienecarboxylic acid, which is further reacted with at least one polyhydric alcohol. (B) to 40 to 60 parts by weight of one or more polymerizable monomoers having one or more polymerizable double bonds in the molecule, and (C) 4.5 to 15 parts by weight of a polystyrene.
Claim 3
Dependent Claim
34 words
A resin composition according to claim 1, wherein the alpha, beta-unsaturated dibasic acid or anhydride thereof is selected from the group consisting of maleic anhydride, maleic acid, fumaric acid, itaconic acid, and citraconic acid.
Claim 4
Dependent Claim
44 words
A resin composition according to claim 2, wherein the polyhydric alcohol is selected from the group consisting of ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, and 1,3-butylene glycol, 1,3- or 1,4-butanediol, 1,6-hexanediol, neopentyl glycol and ethylene oxide or propylene oxide adduct of bisphenol.
Claim 5
Dependent Claim
29 words
A resin composition according to claim 3, wherein the polymerizable monomer is selected from the group consisting of styrene, vinyltoluene, divinylbenzene, diallyl phthalate, chlorostyrene, methyl acrylate, and methyl methacrylate.
Claim 6
Dependent Claim
14 words
A resin composition according to claim 1, wherein the polyhydric alcohol is propylene glycol.
Claim 7
Dependent Claim
17 words
A resin composition according to claim 1, wherein the alpha, beta-unsaturated dibasic acid anhydride is maleic anhydride.
Claim 8
Dependent Claim
18 words
A resin composition according to claim 1, wherein the polystyrene has a molecular weight of 50,000 to 300,000.
Claim 9
Dependent Claim
13 words
A resin composition according to claim 1 wherein the polymerizable monomer is styrene.
Claim 10
Dependent Claim
19 words
A composition according to claim 1, wherein said resin composition consists of component (A), component (B) and component (C).
Claim 11
Dependent Claim
39 words
A composition according to claim 1, wherein said composition contains a curable resin component, and at least one of a filler, a colorant, a curing catalyst, and a reinforcing material, said resin component consisting of (A), (B) and (C)..
Claim 12
Dependent Claim
23 words
A cured resin composition consisting essentially of the cured product of the resin composition of claim 1 and an organic peroxide-containing curing catalyst.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |