Abstract
Some copolymers which contain either aldehyde or ketone carbonyl groups have been treated with phosphorus trichloride and then in sequence with acetic acid and water. On the basis of phosphorus analyses of the resulting products, α-hydroxyphosphonic acid groups have been introduced in amounts ranging from zero to 100% of the theoretical amount. These phosphorus containing polymers with 2% or more of phosphorus are somewhat flame resistant.
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