METHOD FOR PRODUCING BRANCHED POLYPHOSPHONATES WITH NARROW MOLECULAR WEIGHT DISTRIBUTIONS
Disclosed are new compositions consisting of branched polyphosphonates and specific additive compositions that exhibit superior resistance to degradation due to exposure to air, high temperature, moisture or combinations thereof. Also disclosed are polymer mixtures or blends comprising these branched polyphosphonates/additive compositions and commodity and engineering plastics and articles produced therefrom. Further disclosed are articles of manufacture produced from these materials, such as fibers, films, coated substrates, moldings, foams, fiber-reinforced articles, or any combination thereof.
1 . A method to fractionate branched polyphosphonates wherein the polymer is placed in a polar aprotic solvent, allowed to stand and the solvent is decanted from the solid polymer.
2 . The method of claim 1 , wherein the solvent is a nitrile-based solvent of the following general formula; R−CN. Wherein R represents an aromatic or aliphatic radical.
3 . The method of claim 2 , wherein R is CH 3 .
4 . Fractionated branched polyphosphonates produced by the method of claim 1 .
5 . A polymer blend or mixture, comprising:
a) at least one fractionated branched polyphosphonate prepared according to of claim 1 ; and
b) at least one other polymer.
6 . A polymer mixture or blend according to claim 5 , wherein said other polymer is a polycarbonate, polyacrylate, polyacrylonitrile, polyester, polyamide, polystyrene, polyurethane, polyurea, polyepoxy, poly(acrylonitrile butadiene styrene), polyimide, polyarylate, poly(arylene ether), polyethylene, polypropylene, polyphenylene sulfide, poly(vinyl ester), polyvinyl chloride, bismaleimide polymer, polyanhydride, liquid crystalline polymer, polyether, polyphenylene oxide, cellulose polymer, or any combination thereof.
7 . A polymer mixture or blend according to claim 6 , wherein said other polymer consists essentially of polycarbonate.
8 . An article of manufacture produced from the fractionated branched polyphosphonate of claim 1 .
9 . An article of manufacture produced from the polymer mixture or blend of claim 5 .
10 . An article of manufacture according to claim 8 , wherein the article is a fiber, a film, a coating, a molding, a foam, a fiber reinforced article, or any combination thereof.
11 . An article of manufacture according to claim 9 , wherein the article is a fiber, a film, a coating, a molding, a foam, a fiber reinforced article, or any combination thereof.