Branched polyphosphonates that exhibit an advantageous combination of properties, and methods related thereto
First Claim
1. A method for producing branched polyphosphonates, comprising:
- placing a molar excess of a phosphonic acid diaryl ester, one or more bisphenols including 2,2-bis(4-hydroxyphenyl)propane, a branching agent, and a phosphonium catalyst into a reaction vessel;
heating the mixture in the vessel under vacuum to a temperature where phenol beings to distill from the vessel; and
heating the reaction mixture until the evolution of phenol has stopped.
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Accused Products
Abstract
Disclosed are branched polyphosphonates produced via a superior transesterification process, and methods related thereto. These branched polyphosphonates exhibit a unique and advantageous combination of properties, such as outstanding fire resistance, improved heat stability, improved toughness, and superior processing characteristics. 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. Further disclosed are articles of manufacture produced from these polymers, such as fibers, films, coated substrates, moldings, foams, fiber-reinforced articles, or any combination thereof; these articles may be coated with a moisture barrier to enhance their moisture resistance properties.
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Citations
27 Claims
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1. A method for producing branched polyphosphonates, comprising:
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placing a molar excess of a phosphonic acid diaryl ester, one or more bisphenols including 2,2-bis(4-hydroxyphenyl)propane, a branching agent, and a phosphonium catalyst into a reaction vessel;
heating the mixture in the vessel under vacuum to a temperature where phenol beings to distill from the vessel; and
heating the reaction mixture until the evolution of phenol has stopped. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A composition comprising:
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a molar excess of phosphonic acid diaryl ester relative to the amount of 2,2-bis(4-hydroxyphenyl) propane, a branching agent, and a phosphonium catalyst having a substituted or unsubstituted phenolate anion combined in a reaction vessel and heated under reduced pressure to a temperature where phenol distills from a melt in the vessel; and
heating the melt until the viscosity of the melt increases. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A composition comprising:
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a molar excess of phosphonic acid diaryl ester relative to the amount of 2,2-bis(4-hydroxyphenyl) propane and another bisphenol, a branching agent, and a phosphonium catalyst having a substituted or unsubstituted phenolate anion combined in a reaction vessel and heated under reduced pressure to a temperature where phenol distills from a melt in the vessel; and
heating the melt until the viscosity of the melt increases. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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Specification