Patent US4332931A successfully refreshed from Google Patents.
US4332931A
Expired / Lapsed
US
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Process for producing unsaturated polyester
Assignee: Takeda Pharmaceutical Co Ltd
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Filing: 1981-04-09
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Granted: 1982-06-01
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Expires: 2001-04-09
Abstract
Abstract Unsaturated polyester is produced by reacting dicarboxylic acid anhydride with alkylene oxide in the presence of a reaction product of dicarboxylic acid and dicyclopendadiene. The unsaturated polyester thus obtained gives a cured polyester resin having well balanced properties of mechanical strength and boiling-water resistance.
Inventors
- 👤 Takashi Hasegawa
- 👤 Minoru Miki
- 👤 Yutaka Taniguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:51
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/56; C08G63/58
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
28 words
A process for producing an unsaturated polyester, which comprises reacting dicarboxylic acid anhydride with alkylene oxide in the presence of a reaction product of dicarboxylic acid and dicyclopentadiene.
Claim 2
Dependent Claim
28 words
A process for producing an unsaturated polyester, which comprises reacting dicarboxylic acid anhydride with alkylene oxide in the presence of a reaction product of dicarboxylic acid and dicyclopentadiene.
Claim 3
Dependent Claim
31 words
A process as claimed in claim 1, wherein the dicarboxylic acid anhydride is a mixture of α,β-unsaturated dicarboxylic acid anhydride and dicarboxylic acid anhydride other than the α,β-unsaturated dicarboxylic acid anhydride.
Claim 4
Dependent Claim
20 words
A process as claimed in claim 2, wherein the mixture is the one consisting of maleic anhydride and phthalic anhydride.
Claim 5
Dependent Claim
20 words
A process as claimed in claim 1, wherein the alkylene oxide is propylene oxide, ethylene oxide or a mixture thereof.
Claim 6
Dependent Claim
14 words
A process as claimed in claim 4, wherein the alkylene oxide is propylene oxide.
Claim 7
Dependent Claim
22 words
A process as claimed in claim 1, wherein the carboxylic acid is maleic acid, phthalic acid, isophthalic acid or a mixture thereof.
Claim 8
Dependent Claim
14 words
A process as claimed in claim 1, wherein the carboxylic acid is maleic acid.
Claim 9
Dependent Claim
23 words
A process as claimed in claim 1, wherein the carboxylic acid is maleic acid or a mixture of maleic acid and phthalic acid.
Claim 10
Dependent Claim
37 words
A process as claimed in claim 1, wherein the ratio of carboxylic acid to dicyclopentadiene is in the range from the equipmolar proportion to double the equimolar proportion of either one of these components to the other.
Claim 11
Dependent Claim
41 words
A process as claimed in claim 1, wherein the reaction product of dicarboxylic acid and dicyclopentadiene is employed in the proportion of 2 parts to 200 parts against 100 parts of the total weight of dicarboxylic acid anhydride and alkylene oxide.
Claim 12
Dependent Claim
26 words
A process as claimed in claim 1, wherein the unsaturated polyester is the one having an acid value of 5 mg KOH/g to 70 mg KOH/g.
References Cited (Backward Citations)
US4029848A
Cited
US4233432A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-31 | 1985-11-30 | 1986-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-31 | 1989-11-30 | 1990-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-31 | 1993-11-30 | 1994-06-01 | $7700.00 | Window Closed / Lapsed |