US4363907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cohalogenation process for polyesters
Assignee: Dow Chemical Co
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Filing: 1981-07-14
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Granted: 1982-12-14
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Expires: 2001-07-14
Abstract
Abstract Cohalogenation of unsaturated polyesters containing pendant unsaturation and a dicyclopentadienyl ester of an alpha , beta -unsaturated carboxylic acid is carried out at room temperature or lower to simultaneously and selectively halogenate the non alpha , beta -unsaturation. These materials have utility in plastics, such as fire-retardant castings.
Inventors
- 👤 Robert E. Hefner, Jr.
- 👤 Hans R. Friedli
- 👤 Mark J. Hazelrigg, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:34
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/682; C08G63/91; C08G63/914; C08G63/918
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
114 words
A process for preparing halogenated compositions of (1) and α,β-unsaturated polyester containing pendant unsaturated groups, (2) a dicyclpentadienyl ester of an α,β-unsaturated carboxylic acid and (3) a reactive diluent, said process comprising the reaction of (a) a blend of (1) and (2) in proportions that the total unsaturation of pendant and dicyclopentadienyl unsaturation equals, when halogenated, the amount of halogen desired in said halogenated composition, with (b) about a stoichiometric amount, based on said total non α,β-unsaturation, of halogen, said reaction conducted at a temperature of less than about 25° C. until halogenation is substantially complete, after which a polymerization inhibitor-stabilizer is added, any solvent removed, followed by the addition of said reactive diluent.
Claim 2
Dependent Claim
114 words
A process for preparing halogenated compositions of (1) and α,β-unsaturated polyester containing pendant unsaturated groups, (2) a dicyclpentadienyl ester of an α,β-unsaturated carboxylic acid and (3) a reactive diluent, said process comprising the reaction of (a) a blend of (1) and (2) in proportions that the total unsaturation of pendant and dicyclopentadienyl unsaturation equals, when halogenated, the amount of halogen desired in said halogenated composition, with (b) about a stoichiometric amount, based on said total non α,β-unsaturation, of halogen, said reaction conducted at a temperature of less than about 25° C. until halogenation is substantially complete, after which a polymerization inhibitor-stabilizer is added, any solvent removed, followed by the addition of said reactive diluent.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein said halogen is chlorine or bromine or bromine chloride.
Claim 4
Dependent Claim
26 words
The process of claim 1 wherein said unsaturated polyester is prepared from dicarboxylic acids, anhydrides or mixtures thereof and a diol or a mixture of polyols.
Claim 5
Dependent Claim
28 words
The process of claim 3 wherein said dicarboxylic acid is a mixture of tetrahydrophthalic acid, anhydride or a mixture thereof and maleic acid, anhydride or a mixture thereof.
Claim 6
Dependent Claim
24 words
The process of claim 1 wherein said unsaturated polyester is prepared from dicarboxylic acids, anhydrides, or mixtures thereof, a diol or diols and dicyclopentadiene
Claim 7
Dependent Claim
14 words
The process of claim 1 wherein said unsaturated polyester is terminated by alkoxyalkyl phosphonate.
Claim 8
Dependent Claim
13 words
The process of claim 6 wherein said phosphonate end group is methoxymethyl phosphonate.
Claim 9
Dependent Claim
12 words
The process of claim 1 wherein said dicyclopentadienyl ester is dicyclopentadienyl acrylate.
Claim 10
Dependent Claim
12 words
The process of claim 1 wherein said dicyclopentadienyl ester is dicyclopentadienyl methacrylate.
Claim 11
Dependent Claim
13 words
The process of claim 1 wherein said dicyclopentadienyl ester is dicyclopentadienyl alkyleneoxyalkyl acrylate.
Claim 12
Dependent Claim
11 words
The process of claim 1 wherein said dicyclopentadienyl ester is bis(dicyclopentadienyl)fumarate.
Claim 13
Dependent Claim
11 words
The process of claim 1 wherein said reactive diluent is styrene.
Claim 14
Dependent Claim
12 words
The process of claim 1 wherein inhibitor is t-butyl catechol plus styrene.
Claim 15
Dependent Claim
14 words
The process of claim 1 wherein the reaction temperature is less than 0° C.
Claim 16
Dependent Claim
14 words
The process of claim 1 wherein the halogenation reaction is conducted in methylene chloride.
Claim 17
Dependent Claim
16 words
The process of claim 1 wherein after halogenation, a small amount of an epoxide is added.
Claim 18
Dependent Claim
12 words
The process of claim 16 wherein said epoxide is an epoxy resin.
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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) | 1985-12-13 | 1986-06-14 | 1986-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-13 | 1990-06-14 | 1990-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-13 | 1994-06-14 | 1994-12-14 | $7700.00 | Window Closed / Lapsed |