发明的三元：（一）一乙烯基酰胺，如聚乙烯吡咯烷酮或乙烯基己内酰胺；

The terpolymers of the invention: (a) a vinyl lactam, such as vinyl pyrrolidone or vinyl caprolactam;

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发明的三元：（一）一乙烯基酰胺，如聚乙烯吡咯烷酮或乙烯基己内酰胺；

The terpolymers of the invention: (a) a vinyl lactam, such as vinyl pyrrolidone or vinyl caprolactam;

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