Phosphorylated polymers

Abstract

A process is described for the production of phosphorus-containing organic polymers through reaction of dialkyl phosphites with organic polymers comprising carbon-carbon double bonds in the presence of organic compounds that form free radicals under the reaction conditions, with covalent linkage of the phosphorus atom of the dialkyl phosphite to a carbon atom of the organic polymer.

1 . A phosphorus-containing organic polymer obtained by the process comprising:
 reacting at least one dialkyl phosphite with at least one organic polymer comprising at least one carbon-carbon double bond in the presence of at least one organic compound that forms free radicals during the reacting, with a covalent linkage of the phosphorus atom of the dialkyl phosphite to a carbon atom of the organic polymer,   wherein:   the organic polymer has from 0.01 to 50 mol %, based on monomer units of the organic polymer, of ionic groups; and   the organic polymer has a number-average molecular weight (M n ) of from 2000 to 300000.   
     
     
         2 . The phosphorus-containing organic polymer of  claim 1 , wherein the ionic groups are independently selected from the group consisting of a carboxy late group, a sulfinate group, a sulfonate group, and a sulfate group. 
     
     
         3 . The phosphorus-containing organic polymer of  claim 2 , wherein the organic polymer is a sulfonated organic polymer. 
     
     
         4 . The phosphorus-containing organic polymer of  claim 1 , wherein the organic polymer is a random copolymer or a di- or multiblock copolymer. 
     
     
         5 . The phosphorus-containing organic polymer of  claim 1 , wherein the carbon-carbon double bond is present in a main polymer chain within the organic polymer. 
     
     
         6 . The phosphorus-containing organic polymer of  claim 5 , wherein the organic polymer has polymerized units of vinylaromatic monomers and diene monomers. 
     
     
         7 . The phosphorus-containing organic polymer of  claim 6 , wherein the organic polymer has, in each case based on the organic polymer, from 10 to 70% by weight of copolymerized units of vinylaromatic monomers and from 30 to 90% by weight of copolymerized units of diene monomers, and wherein from 0.5 to 5% of the aromatic units have been sulfonated. 
     
     
         8 . The process according to  claim 7 , wherein the organic polymer has, in each case based on the organic polymer, from 20 to 60% by weight of copolymerized units of vinylaromatic monomers and from 40 to 80% by weight of copolymerized units of diene monomers, and wherein from 1 to 4% of the aromatic units have been sulfonated. 
     
     
         9 . The phosphorus-containing organic polymer of  claim 1 , wherein the phosphorus-containing organic polymer is hydrolyzed to form phosphonic acid groups. 
     
     
         10 . A thermoplastic molding composition, comprising components:
 a) from 30 to 95% by weight of at least one thermoplastic polymer which comprises no phosphorus,   b) from 1 to 30% by weight of at least one phosphorus-containing organic polymer of  claim 1 ,   c) from 0 to 15% by weight of at least one other flame-retardant auxiliary,   d) from 0 to 20% by weight of at least one impact-modifying polymer,   e) from 0 to 50% by weight of glass fibers,   f) from 0 to 30% by weight of at least one other additive,   wherein the total amount of the components a) to f) is 100% by weight.