US4065438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production acid polyester resins and powder coating products prepared from said resins
Assignee: Labofina SA
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Filing: 1977-02-01
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Granted: 1977-12-27
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Expires: 1997-02-01
Abstract
Abstract Disclosed is a process for producing acid polyester resins used for the manufacture of coatings, especially powder coatings, wherein a prepolymer having a hydroxyl index of between 40 and 200 is reacted with isophthalic acid to form an acid polyester resin having an acid index between 50 and 100 which is further reacted with an epoxy resin.
Inventors
- 👤 Jozef Verborgt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:02
CPC Classifications
C; C09; C09D; C09D167/00; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/181; C08G63/20; C09D163/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
127 words
Process for producing acid polyester resins which are used to manufacture coating products by reaction with an epoxy resin, said polyester acid resins being produced from a prepolymer having a hydroxyl index comprised between 40 and 200, said prepolymer being prepared from at least one divalent aliphatic alcohol and a mixture of organic acids, this process being characterized by the fact that said mixture of organic acids comprises from 10 to 100% by weight of terephthalic acid, from 0 to 90% by weight of isophthalic acid and from 0 to 20% by weight of trimellitic acid or its anhydride, and that the acid polyester resin is prepared by reacting said prepolymer with isophthalic acid, said acid polyester resin having an acid index comprised between 50 and 100.
Claim 2
Dependent Claim
127 words
Process for producing acid polyester resins which are used to manufacture coating products by reaction with an epoxy resin, said polyester acid resins being produced from a prepolymer having a hydroxyl index comprised between 40 and 200, said prepolymer being prepared from at least one divalent aliphatic alcohol and a mixture of organic acids, this process being characterized by the fact that said mixture of organic acids comprises from 10 to 100% by weight of terephthalic acid, from 0 to 90% by weight of isophthalic acid and from 0 to 20% by weight of trimellitic acid or its anhydride, and that the acid polyester resin is prepared by reacting said prepolymer with isophthalic acid, said acid polyester resin having an acid index comprised between 50 and 100.
Claim 3
Dependent Claim
131 words
Process for producing acid polyester resins, according to claim 1, from a prepolymer having a hydroxyl index comprised between 40 and 200, catalytically prepared from at least a divalent aliphatic alcohol used in an amount corresponding to 25 to 35% by weight based on the total weight of the reaction mixture and a mixture of organic acids, this process being characterized by the fact that said mixture preferably comprises from 35 to 50% by weight of terephthalic acid, from 5 to 30% of isophthalic acid and from 8 to 15% of trimellitic acid or its anhydride, and that the acid polyester resin is prepared by reacting this prepolymer with isophthalic acid used in an amount corresponding to 20 to 30% by weight based on the total weight of the reaction mixture.
Claim 4
Dependent Claim
19 words
Process according to claim 1 wherein the functionality of the acid polyester resin is comprised between 2 and 3.
Claim 5
Dependent Claim
97 words
Process for producing powder coating products, which consists in: a. preparing a prepolymer having a hydroxyl index comprised between 40 and 200, from at least one divalent aliphatic alcohol and a mixture of organic acids consisting in 10 to 100% by weight terephthalic acid, 0 to 90% by weight of isophthalic acid and 0 to 20% by weight of trimellitic acid or its anhydride, b. by preparing an acid polyester resin having an acid index comprised between 50 and 100 by reacting said prepolymer with isophthalic acid, c. reacting said acid polyester resin with an epoxy resin.
Claim 6
Dependent Claim
97 words
Process for producing powder coating products, which consists in: a. preparing a prepolymer having a hydroxyl index comprised between 40 and 200, from at least one divalent aliphatic alcohol and a mixture of organic acids consisting in 10 to 100% by weight terephthalic acid, 0 to 90% by weight of isophthalic acid and 0 to 20% by weight of trimellitic acid or its anhydride, b. by preparing an acid polyester resin having an acid index comprised between 50 and 100 by reacting said prepolymer with isophthalic acid, c. reacting said acid polyester resin with an epoxy resin.
Claim 7
Dependent Claim
37 words
Process according to claim 4 wherein 20 to 40% by weight of the acid polyester resin are reacted with 20 to 60% by weight of an epoxy resin and 20 to 60% by weight of titanium dioxide.
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) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |