| http://www.w3.org/ns/prov#value | - d of a retarding layer which delays neutralization, the neutralizing layer consisting mainly of a copolymer essentially containing polymerized units of acid-group-containing copolymerizable monomers and, optionally, up to 10% by weight of polymerized units of copolymerizable monomers free from acid groups, and in which according to the invention the copolymer contains from 5 to 50% by weight of po
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