US4388440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester resin blend
Assignee: Mobil Oil AS
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Filing: 1980-08-05
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Granted: 1983-06-14
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Expires: 2000-08-05
Abstract
Abstract A blend, useful as a molding composition, of an unsaturated polyester with a mixture of isomeric methyl ethenyl benzenes containing a high proportion of the para-isomer.
Inventors
- 👤 James G. Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:18
CPC Classifications
C; C08; C08F; C08F299/00; C08F299/02; C08F299/04; C08F299/0478
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
89 words
A resin composition which comprises an unsaturated polyester and a polymerizable mixture of isomers of methyl ethenyl benzene consisting essentially of 1-methyl-2-ethenyl benzene, 1-methyl-3-ethenyl benzene, and 1-methyl-4-ethenyl benzene, in the following proportions by weight: 1-methyl-2-ethenyl benzene 0 to 0.1% 1-methyl-3-ethenyl benzene 1 to 10% 1-methyl-4-ethenyl benzene at least 90%; said composition having a lower viscosity and a lower exotherm upon curing than the corresponding compositions in which said isomers comprise methyl ethenyl benzene containing 60% or more of the meta isomer and 40% or less of the para isomer.
Claim 2
Dependent Claim
89 words
A resin composition which comprises an unsaturated polyester and a polymerizable mixture of isomers of methyl ethenyl benzene consisting essentially of 1-methyl-2-ethenyl benzene, 1-methyl-3-ethenyl benzene, and 1-methyl-4-ethenyl benzene, in the following proportions by weight: 1-methyl-2-ethenyl benzene 0 to 0.1% 1-methyl-3-ethenyl benzene 1 to 10% 1-methyl-4-ethenyl benzene at least 90%; said composition having a lower viscosity and a lower exotherm upon curing than the corresponding compositions in which said isomers comprise methyl ethenyl benzene containing 60% or more of the meta isomer and 40% or less of the para isomer.
Claim 3
Dependent Claim
35 words
The composition of claim 1 in which the isomers are present in the mixture in the following proportions by weight: 1-methyl-2-ethenyl benzene 0 to 0.05% 1-methyl-3-ethenyl benzene 1 to 5% 1-methyl-4-ethenyl benzene at least 95%.
Claim 4
Dependent Claim
35 words
The composition of claim 1 in which the isomers are present in the mixture in the following proportions by weight: 1-methyl-2-ethenyl benzene 0 to 0.05% 1-methyl-3-ethenyl benzene 1 to 3%. 1-methyl-4-ethenyl benzene at least 97%.
Claim 5
Dependent Claim
25 words
A composition according to claim 1 in which the polyester is derived from a dihydric alcohol and a unsaturated dibasic carboxylic acid or its anhydride.
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) | 1986-06-13 | 1986-12-13 | 1987-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-13 | 1990-12-13 | 1991-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-13 | 1994-12-13 | 1995-06-14 | $7700.00 | Window Closed / Lapsed |