Starch acrylamides and the method for preparing the same

The starch acrylamide according to claim 2 wherein the starch chain is characterized as containing an average of at least one appendant acrylamide group for each 1000 D-glucose units of said starch chain.

The starch acrylamide according to claim 7 wherein D is an oxy group, Q is an alkylene moiety linking the starch D group with the nitrogen atom of said acrylamide group and "a" represents a D.S. of at least 0.0005.

A method for preparing a starch acrylamide characterized as containing terminal ##STR11## moieties, said method comprising reacting a starch which contains reactive hydrogen atoms with an N-methylol reactant wherein the N-methylol reactant is characterized as containing a ##STR12## grouping, with the reaction being conducted in the presence of an acid catalyst in an amount sufficient to catalyze the condensation reaction between the starch and the N-methylol reactant.

In a method for polymerizing an ethylenically unsaturated starch derivative in the presence of a polymerization initiator, the improvement which comprises interpolymerizing a starch acrylamide wherein the starch acrylamide is characterized as comprising a starch chain and appendant acrylamide groups contiguously attached to said chain with the appendant groups being characterized as containing terminal ##STR14## moieties.

A polymerized starch acrylamide composition comprising recurring and interpolymerized starch acrylamide units represented by the sturcture:

• ##STR16## wherein starch represents a starch chain, R.sup.1 is a member selected from the group consisting of hydrogen and a monoorgano group, R represents a member selected from the group consisting of hydrogen and a monoorgano group, Q represents an organo group which divalently links the D group with the nitrogen atom;
• D is a member selected from the group consisting of sulfur and oxygen, and "a" represents the number of interpolymerized acrylamide substituents per anhydroglucose unit of said starch chain.