Claims
- 1. A curable article comprising a fibrous substrate impregnated with a curable composition containing chemically combined bromine in an amount effective to impart flame retardancy, said composition comprising:
- (I) about 25-50% of a resinous composition containing 15-20% chemically combined bromine and comprising the reaction product obtained by heating at a temperature in the range of about 125.degree.-225.degree. C., in the presence of a catalytic amount of at least one basic reagent, a mixture comprising:
- (A) at least one halogen-free bisphenol polyglycidyl ether having an average of at most one aliphatic hydroxy group per molecule;
- (B) about 15-25% of at least one halogen-free epoxidized novolak; and
- (C) 25-35% of at least one bisphenol containing bromine as aryl substituents;
- the percentages of components B and C being based on total reagents A, B and C;
- (II) about 35-55% of at least one polyphenylene ether;
- (III) about 4-15% of at least one halogen-free novolak, substantially all oxygen therein being in e form phenolic hydroxy groups;
- (IV) an amount of at least one of imidazoles and arylene polyamides to provide a total of at least 2 milliequivalents of basic nitrogen per 100 parts of said curable composition;
- (V) about 0.1-1.0% of zinc in the form of a zinc salt which is soluble or stably dispersible in said curable composition; and
- (VI) about 1-4% of antimony pentoxide stably dispersed in said curable composition;
- said percentages being by weight and based on the total of components I-VI and any other resinous materials and brominated materials present.
- 2. An article according to claim 1 wherein reagent A has the formula ##STR7## wherein n has an average value up to 1; reagent B is a novolak prepared from formaldehyde, phenol and epichlorohydrin and reagent C is 2,2-bis(3,5-dibromo-4-hydroxyphenyl)propane; said composition also containing (VII) an amount up to about 10% of at least one polyepoxy compound selected from halogen-free bisphenol polyglycidyl ethers having an average of at most one aliphatic hydroxy group per molecule other than polyglycidyl ether (A) and halogen-free epoxidized novolaks other than epoxidized novolak (B).
- 3. An article according to claim 2, wherein n is 0, component II is a poly(2,6-dimethyl-1,4-phenylene ether) having a number average molecular weight within the range of about 12,000-40,000 and component VII is an epoxidized novolak and is present in the amount of about 4-8%.
- 4. An article according to claim 3 wherein the substrate is glass fiber.
- 5. An article according to claim 3 wherein component VII is a halogen-free epoxidized novolak prepared from phenol, formaldehyde and epichlorohydrin.
- 6. An article according to claim 3 wherein component IV is at least one imidazole and provides a total of at least 4.5 milliequivalents of basic nitrogen per 100 parts of said curable composition.
- 7. An article according to claim 3 wherein component IV is a mixture of at least one imidazole with at least one arylene polyamine and provides a total of at least 4.5 milliequivalents of basic nitrogen per 100 parts of said curable composition.
- 8. An article according to claim 3 wherein component V is zinc acetylacetonate or zinc stearate.
- 9. An article according to claim 8 wherein the proportions are:
- ______________________________________Bromine 6-9%;Component I about 30-40%;Component II about 40-50%;Component III about 4-8%;Component IV about 5-10 milliequivalents of basic nitrogen;Component V about 0.1-0.6% of zinc;Component VI about 1-3% of antimony pentoxide;Component VII about 4.2-4.8%.______________________________________
- 10. An article according to claim 9 wherein the polyphenylene ether comprises molecules having end groups of the formula ##STR8## wherein each Q.sup.1 is independently halogen, primary or secondary lower alkyl, phenyl, haloalkyl, aminoalkyl, hydrocarbonoxy, or halohydrocarbonoxy wherein at least two carbon atoms separate the halogen and oxygen atoms; each Q.sup.2 is independently hydrogen, halogen, primary or secondary lower alkyl, phenyl, haloalkyl, hydrocarbonoxy or halohydrocarbonoxy as defined for Q.sup.1 ; and each R.sup.2 is independently hydrogen or a C.sub.1-6 primary alkyl radical.
- 11. An article according to claim 10 wherein each R.sup.2 is n-butyl.
- 12. An article according to claim 3 wherein said curable composition also contains at least one aliphatic tris(dialkylphosphato)titanate of the formula ##STR9## wherein R.sup.3 is C.sub.2-6 primary or secondary alkyl or alkenyl, R.sup.4 is C.sub.1-3 alkylene, R.sup.5 is C.sub.1-5 primary or secondary alkyl, R.sup.6 is C.sub.5-12 primary or secondary alkyl and x is from 0 to about 3, in the amount of about 0.1-1.0 part by weight per 1-parts of the resinous composition.
- 13. An article according to claim 12 wherein R.sup.3 is alkyl, R.sup.4 is methylene, R.sup.5 is ethyl, R.sup.6 is octyl and x is 0 or 1.
- 14. A cured article prepared by the application of heat and pressure to the article of claim 1.
- 15. A cured article prepred by the application of heat and pressure to the article of claim 2.
- 16. A cured article prepred by the application of heat and pressure to the article of claim 9.
- 17. A cured article prepred by the application of heat and pressure to the article of claim 12.
Parent Case Info
This application is a continuation-in-part of copending application Ser. No. 07/332,070, now U.S. Pat. No. 4,975,319, which is a division of application Ser. No. 07/219,106, now U.S. Pat. No. 4,853,423.
US Referenced Citations (10)
Foreign Referenced Citations (2)
Number |
Date |
Country |
58-69052 |
Apr 1983 |
JPX |
62-72714 |
Apr 1987 |
JPX |
Divisions (1)
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Number |
Date |
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Parent |
219106 |
Jul 1988 |
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Continuation in Parts (1)
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Number |
Date |
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Parent |
332070 |
Apr 1989 |
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