US4442269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Staged copolymerization of polyesters
Assignee: EIDP Inc
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Filing: 1982-12-15
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Granted: 1984-04-10
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Expires: 2002-12-15
Abstract
Abstract Polyester copolymers prepared by a non-equilibrium, two-stage process conducted without external catalysts have relatively high polydispersity and low viscosity, permitting the preparation of high solids paints.
Inventors
- 👤 Eugene G. Sommerfeld
- 👤 Andrew P. Stamegna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:38
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/02; C08G63/12; C09; C09D; C09D167/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
137 words
A non-equilibrium, two-stage polymerization process conducted without external catalysts for producing polyester copolymers having a linear segment with terminal hydroxyl groups and a number average molecular weight (Mn) of at least about 500 and a branched segment with lateral hydroxyl groups wherein in the first stage of the process one half of the carboxyl groups of a diacid or a diacid anhydride are reacted in approximately stoichiometric proportions with one of (A) one half of the hydroxyl groups of the linear segment and (B) 10-80% of the hydroxyl groups of the branched segment to form a first reaction product, and then in the second stage of the process the other half of the carboxyl groups of the first reaction product are reacted in approximately stoichiometric proportions with the hydroxyl group of the other of (A) and (B).
Claim 2
Dependent Claim
137 words
A non-equilibrium, two-stage polymerization process conducted without external catalysts for producing polyester copolymers having a linear segment with terminal hydroxyl groups and a number average molecular weight (Mn) of at least about 500 and a branched segment with lateral hydroxyl groups wherein in the first stage of the process one half of the carboxyl groups of a diacid or a diacid anhydride are reacted in approximately stoichiometric proportions with one of (A) one half of the hydroxyl groups of the linear segment and (B) 10-80% of the hydroxyl groups of the branched segment to form a first reaction product, and then in the second stage of the process the other half of the carboxyl groups of the first reaction product are reacted in approximately stoichiometric proportions with the hydroxyl group of the other of (A) and (B).
Claim 3
Dependent Claim
39 words
The process of claim 1 wherein the reaction of the first stage is conducted at temperatures of at least about 100° C. and the reaction of the second stage is conducted at temperatures of at least about 200° C.
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein in the first stage said carboxyl groups are reacted with the hydroxyl groups of the branched segment.
Claim 5
Dependent Claim
23 words
The process of claim 1 wherein in the first stage said carboxyl groups are reacted with the hydroxyl groups of the linear segment.
Claim 6
Dependent Claim
10 words
A polyester copolymer produced by the process of claim 1.
Claim 7
Dependent Claim
10 words
A polyester copolymer produced by the process of claim 2.
Claim 8
Dependent Claim
10 words
A polyester copolymer produced by the process of claim 3.
Claim 9
Dependent Claim
10 words
A polyester copolymer produced by the process of claim 4.
Claim 10
Dependent Claim
77 words
A polyester copolymer of claim 6 wherein after the first stage and before the second stage of polymerization the branched segment has a number average molecular weight of 750-1000, a hydroxyl number of 175-300, an acid number of 20-60, and a number average functionality of 2.5-11; and the linear segment has a number average molecular weight of 500-3000, a hydroxyl number of 15-300, an acid number of less than 5 and a number average functionality of 1.1-2.
Claim 11
Dependent Claim
77 words
A polyester copolymer of claim 7 wherein after the first stage and before the second stage of polymerization the branched segment has a number average molecular weight of 750-1000, a hydroxyl number of 175-300, an acid number of less than 5, and a number average functionality of 2.5-11; and the linear segment has a number average molecular weight of 500-3000, a hydroxyl number of 15-300, an acid number of 20-60 and a number average functionality of 1.1-2.
Claim 12
Dependent Claim
36 words
A coating composition comprising A. a polyester copolymer of claim 9, and B. 10-50% by weight based on A plus B of a crosslinker selected from melamine/formaldehyde resins, di- and poly-isocyanate resins, and urea formaldehyde resins.
Claim 13
Dependent Claim
36 words
A coating composition comprising A. a polyester copolymer of claim 10, and B. 10-50% by weight based on A plus B of a crosslinker selected from melamine/formaldehyde resins, di- and poly-isocyanate resins, and urea formaldehyde resin.
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) | 1987-04-10 | 1987-10-10 | 1988-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-10 | 1991-10-10 | 1992-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-10 | 1995-10-10 | 1996-04-10 | $7700.00 | Window Closed / Lapsed |