Condensation polymers of aldehydes or ketones with monomers covered by at least two of the groups [CPC: C09J161/04], [CPC: C09J161/18] and [CPC: C09J161/20]
Condensation polymers of aldehydes or ketones with monomers covered by at least two of the groups [CPC: C09J161/04], [CPC: C09J161/18] and [CPC: C09J161/20]