Patent US3901953A successfully refreshed from Google Patents.
US3901953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing unsaturated polyester resins
Assignee: DIRECTOR GENERAL MR KEISHIN MA
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Filing: 1973-08-30
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Granted: 1975-08-26
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Expires: 1993-08-30
Abstract
Abstract In a process for manufacturing unsaturated polyester resins which comprises (A) a stage of reacting a dialkyl terephthalate with a polyhydric alcohol in the presence of an interesterification catalyst, (B) a stage of reacting the reaction product obtained at the stage (A) with an unsaturated dicarboxylic acid, one or more polyhydric alcohols and optionally a saturated dicarboxylic acid to produce an unsaturated alkyd resin and (C) a stage of dissolving the unsaturated alkyd resin obtained at the stage (B) in a vinyl monomer, the reaction at the stage (A) or (B) is carried out in the coexistence of a hydroquinone and a phosphite.
Inventors
- 👤 Takeyoshi Watanabe
- 👤 Morimasa Sato
- 👤 Wataru Koga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:27
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/54; C08K5/49; C08K5/51; C08K5/52; C08K5/524
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
101 words
A PROCESS FOR MANUFACTURING UNSATURATED POLYESTER RESINS WHICH COMPRISES (A) REACTING IN A FIRST STAGE A DIALKYL TEREPHTHALATE WITH A POLYHYDRIC ALCOHOL IN THE PRESENCE OF AN INTERESTERIFICATION REACTION CATALYST, (B) REACTING IN A SECOND STAGE THE REACTION PRODUCT OF STAGE (A) WITH AN UNSATURATED DICARBOXYLIC ACID AND AT LEAST ONE POLYHYDRIC ALCOHOL TO PRODUCE AN UNSATURATED ALKYL RESIN AND (C) FINALLY DISSOLVING THE UNSATURATED ALKYL RESIN OBTAINED FROM STAGE (B) IN A VINYL MONOMER, CHARACTERIZED IN THAT THE REACTION OF STAGE (A) OR (B) IS CARRIED OUT IN THE CONCURRENT PRESENCE OF A HYDROQUINONE AND AN ALKYL OR ARYL PHOSPHITE.
Claim 2
Dependent Claim
101 words
A PROCESS FOR MANUFACTURING UNSATURATED POLYESTER RESINS WHICH COMPRISES (A) REACTING IN A FIRST STAGE A DIALKYL TEREPHTHALATE WITH A POLYHYDRIC ALCOHOL IN THE PRESENCE OF AN INTERESTERIFICATION REACTION CATALYST, (B) REACTING IN A SECOND STAGE THE REACTION PRODUCT OF STAGE (A) WITH AN UNSATURATED DICARBOXYLIC ACID AND AT LEAST ONE POLYHYDRIC ALCOHOL TO PRODUCE AN UNSATURATED ALKYL RESIN AND (C) FINALLY DISSOLVING THE UNSATURATED ALKYL RESIN OBTAINED FROM STAGE (B) IN A VINYL MONOMER, CHARACTERIZED IN THAT THE REACTION OF STAGE (A) OR (B) IS CARRIED OUT IN THE CONCURRENT PRESENCE OF A HYDROQUINONE AND AN ALKYL OR ARYL PHOSPHITE.
Claim 3
Dependent Claim
20 words
A process according to claim 1 wherein a hydroquinone and a phosphite are present at the beginning of stage (A).
Claim 4
Dependent Claim
17 words
A process according to claim 1 wherein a hydroquinone and a phosphite are present at stage (B).
Claim 5
Dependent Claim
21 words
A process according to claim 2 wherein stage (A) is carried out in the presence of hydroquinone and triphenyl phosphite. carried
Claim 6
Dependent Claim
20 words
A process according to claim 3 wherein stage (B) is carried out in the presence of hydroquinone and triphenyl phosphite.
Claim 7
Dependent Claim
14 words
A process according to claim 1 wherein the unsaturated dicarboxylic acid is maleic anhydride.
Claim 8
Dependent Claim
33 words
A process according to claim 1 wherein said stage (A) reaction product is reacted in stage (B) with a saturated dicarboxylic acid in addition to said unsaturated dicarboxylic acid and said polyhydric alcohol.
Claim 9
Dependent Claim
44 words
A process according to claim 1 wherein said hydroquinone is present in the amount of about 0.005 - 0.04% and said phosphite is present in the amount of about 0.005 - 0.5%, both by weight of the dicarboxylic acid and polyhydric alcohol being reacted.
Claim 10
Dependent Claim
34 words
A process according to claim 1 where said stage (A) reaction is carried out at a temperature of about 200*-250*C and said stage (B) reaction is carried out at a temperature of about 180*-230*C.
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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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |