US4052358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pigmentable low-shrinkage unsaturated polyester resin composition
Assignee: Toshiba Chemical Products Co Ltd
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Filing: 1976-02-19
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Granted: 1977-10-04
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Expires: 1996-02-19
Abstract
Abstract An unsaturated polyester resin composition comprises a mixture of a particular unsaturated polyester, an unsaturated monomer copolymerizable with the unsaturated polyester and polystyrene having a certain particle size in specific amounts. The unsaturated polyester is a reaction product of a dicarboxylic acid component containing α,β-unsaturated dicarboxylic acid with a glycol component containing certain amounts of neopentyl glycol and 2,2-bis(4-hydroxycyclohexyl) propane. The resin composition exhibits favorable properties such as low shrinkage upon curing, good colorability and good storage stability, and is useful particularly in formulating premixed molding compounds.
Inventors
- 👤 Moriyasu Wada
- 👤 Katuya Kumagai
- 👤 Takashi Kamo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:45
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
102 words
A pigmentable low-shrinkage unsaturated polyester resin composition comprising a mixture of: 25 to 70% by weight of unsaturated polyester based on a reaction product of a dicarboxylic acid component comprising α,β-unsaturated dicarboxylic acid with a glycol component comprising, on the basis of the total amount of the glycol component, 15 to 70 mol% of neopentyl glycol and 10 to 30 mol% of 2,2-bis(4-hydroxycyclohexyl) propane; 60 to 18% by weight of unsaturated monomer copolymerizable with the unsaturated polyester; and 45 to 4% by weight of polystyrene or a butadiene modified polystyrene having such a particle size as to pass through a 50-mesh screen.
Claim 2
Dependent Claim
102 words
A pigmentable low-shrinkage unsaturated polyester resin composition comprising a mixture of: 25 to 70% by weight of unsaturated polyester based on a reaction product of a dicarboxylic acid component comprising α,β-unsaturated dicarboxylic acid with a glycol component comprising, on the basis of the total amount of the glycol component, 15 to 70 mol% of neopentyl glycol and 10 to 30 mol% of 2,2-bis(4-hydroxycyclohexyl) propane; 60 to 18% by weight of unsaturated monomer copolymerizable with the unsaturated polyester; and 45 to 4% by weight of polystyrene or a butadiene modified polystyrene having such a particle size as to pass through a 50-mesh screen.
Claim 3
Dependent Claim
20 words
The composition of claim 1, wherein the dicarboxylic acid component contains an additional saturated dicarboxylic acid up to 15 mol%.
Claim 4
Dependent Claim
32 words
The composition of claim 1, wherein the unsaturated monomer is present in the range of 35 to 54% by weight of the total amount of the unsaturated polyester and the unsaturated monomer.
Claim 5
Dependent Claim
49 words
The composition of claim 1, wherein the polystyrene is present in the range of 40 to 8% by weight of the mixture, and the unsaturated monomer is present in the range of 35 to 58% by weight of the total amount of the unsaturated polyester and the unsaturated monomer.
Claim 6
Dependent Claim
41 words
The composition of claim 3, wherein the glycol component further comprises 1 to 15 mol% of supplemental polyhydric alcohol selected from the group consisting of propylene glycol, 3-methyl-1,5-pentanediol, 2-metyl-1,4-butanediol, isopentyl glycol, 1,5-pentanediol, diethylene glycol, dipropylene glycol, pentaerithlitol, glycerine and mixtures thereof.
Claim 7
Dependent Claim
13 words
The composition of claim 5, wherein the supplemental polyhydric alcohol is propylene glycol.
Claim 8
Dependent Claim
29 words
The composition of claim 6, wherein the dicarboxylic acid component is α,β-unsaturated dicarboxylic acid selected from the group consisting of maleic anhydride, fumaric acid, itaconic acid and mixtures thereof.
Claim 9
Dependent Claim
24 words
A bulk molding compound comprising 18 to 35% by weight of composition of claim 7 and 5 to 30% by weight of glass fibers.
Claim 10
Dependent Claim
24 words
A sheet molding compound comprising 25 to 40% by weight of composition of claim 7 and 20 to 40% by weight of glass fibers.
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) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |