Crystalline polyphosphonates and methods related thereto
View Patent ↗Disclosed are crystalline polyphosphonates and a method to induce crystallization. These crystalline polyphosphonates exhibit a unique and advantageous combination of properties, allowing for solid state post polymerization reactions and solid state dry mixing with other polymers. Also disclosed are polymer compositions that comprise these 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 crystalline polyphosphonates and polymer compositions, such as fibers, films, coated substrates, moldings, foams, fiber-reinforced articles, or any combination thereof.
1. Crystalline linear or branched polyphosphonate homopolymers or copolymers having units of the following chemical structure;
wherein R 1 , R 2 and R 3 are independently O or S; at least one of R 1 ,R 2 and R 3 is O; R 4 is a linear or branched C1-C4 alkyl or haloalkyl, phenyl, halophenyl, tolyl, benzyl, biphenyl or cycloalkyl; and R 5 is diradical derived from a bisphenol;
wherein said crystalline liner or branched polyphosphonate homopolymers or copolymers are prepared by a method comprising:
placing a liner or branched polyphosphonate homopolymer or copolymer in the presence of at least one solvent or solvent vapor;
saturating the liner or branched polyphosphonate homopolymer or copolymer with said solvent or solvent vapor; and
removing the solvent or solvent vapor.
2. Crystalline polyphosphonate compositions according to claim 1 wherein R 1 , R 2 and R 3 are all O, R 4 is a alkyl group and R 5 is;
3. An article of manufacture produced from a crystalline polyphosphonate of claim 1 .
4. An article of manufacture according to claim 3 , wherein the article is a fiber, a film, a coating, a molding, a foam, a fiber reinforced article, or any combination thereof.