Branched polyphosphonates
First Claim
Patent Images
1. A method of making branched polyphosphonates comprising:
- combining a phosphonium catalyst, phosphonic acid diaryl ester and bisphenol in a ratio to form a polyphosphonate to form a reaction mixture; and
heating said reaction mixture at a reduced pressure to form the polyphosphonate.
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Abstract
Disclosed are branched polyphosphonates produced using a polycondensation process, that result in polyphosphonates having a Tg of at least 100° C., and which can be further processed to have improved hydrolytic stability compared to other polyphosphonates. The method and polyphosphonate compositions may be made from readily available starting materials providing lower cost fire retardant materials. Also disclosed are polymer compositions that comprise these branched polyphosphonates and at least one other polymer, wherein the resulting polymer compositions exhibit flame retardant properties.
86 Citations
44 Claims
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1. A method of making branched polyphosphonates comprising:
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combining a phosphonium catalyst, phosphonic acid diaryl ester and bisphenol in a ratio to form a polyphosphonate to form a reaction mixture; and heating said reaction mixture at a reduced pressure to form the polyphosphonate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 41, 42, 43, 44)
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14. A composition comprising:
a polyphosphonate 2,2-bis(4-hydroxyphenyl) propane comprising monomer derived units and having a Tg of at least 100°
C., a relative viscosity of greater than 1.1 when measured on a 0.5 percent solution in methylene chloride, an MW of at least 10,000 g/mol, and a polydispersity of 2.3 or greater.
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15. A composition comprising:
a polyphosphonate having a Tg of at least 100°
C. made by heating phosphonic acid diaryl ester and 2,2-bis(4-hydroxyphenyl) propane with a removable phosphonium catalyst at a reduced pressure.- View Dependent Claims (16, 17)
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18. A composition comprising:
a polyphosphonate 2,2-bis(4-hydroxyphenyl) propane having derived repeat units, wherein said polyphosphonate has a Tg of at least 100°
C., a relative viscosity of greater than 1.15 when measured on a 0.5 percent solution in methylene chloride, an MW of at least 15,000 g/mol, a polydispersity of 2.3 or greater, and which is hydrolytically stable.
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19. A composition comprising:
a hydrolytically stable polyphosphonate having a Tg of at least 100°
C. made by heating at reduced pressure a polyphosphonate and a removable phosphonium catalyst.- View Dependent Claims (20, 21, 22, 23)
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24. A method for producing branched polyphosphonates, comprising:
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combining one or more phosphonic acid diaryl ester, 2,2-bis(4-hydroxyphenyl) propane or a mixture of 2,2-bis(4-hydroxyphenyl) propane and other bisphenols, and a phosphonium catalyst to form a reaction mixture wherein said one or more phosphonic acid diaryl ester is in a stiochiometric equivalent amount or excess amount of said 2,2-bis(4-hydroxyphenyl) propane or 2,2-bis(4-hydroxyphenyl) propane and other bisphenols; heating said mixture; and removing phenol generated by the heating to form a polyphosphonate. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A method of making polyphosphonates comprising:
heating a polyphosphonate and a phosphonium catalyst in a vessel to form a hydrolytically stable polyphosphonate.
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35. A polyphosphonate prepared by a method comprising:
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combining one or more phosphonic acid diaryl ester, 2,2-bis(4-hydroxyphenyl) propane or 2,2-bis(4-hydroxyphenyl) propane and other bisphenols, and a phosphonium catalyst wherein said phosphonic acid diaryl ester is in a stiochiometric equivalent amount or excess amount of said bisphenol to form a reaction mixture; heating the reaction mixture at reduced pressure to form a polyphosphonate; and removing material generated by the heating; wherein the polyphosphonate exhibits a Tg of at least 100°
C. - View Dependent Claims (36, 37, 38)
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39. A composition comprising:
a polyphosphonate and a tetraphenylphosphonium catalyst in a reaction vessel heated at reduced pressure whereby a hydrolytically stable polyphosphonate is formed. - View Dependent Claims (40)
Specification