Liquid de-inking compositions based on polyalkoxylated terpenic compounds and their use for de-inking

A process for de-inking old ink-bearing papers in the presence of a liquid composition comprising a compound of polyalkoxylated terpenic origin of formula:

• Z—X—W—[CH(R5)—CH(R6)—O]q—A (I)
• in which:
• the symbol Z represents a bicyclo[a,b,c]heptenyl or bicyclo[a,b,c]heptyl radical, optionally substituted with at least one C1-C6 alkyl radical,
• a, b and c being such that:
• a+b+c=5,
• a=2, 3 or 4,
• b=1 or 2,
• c=0 or 1,
• the symbol X represents a group
• —CH2—C(R1)(R2)—O— in which the symbols R1 and R2, which may be identical or different, represent a linear or branched C1-C6 (cyclo)alkyl or (cyclo)alkenyl group,
• or —O—CH(R′1)—CH(R′2)—O— in which the symbols R′1 and R′2, which may be identical or different, represent a linear or branched C1-C22 (cyclo)alkyl or (cyclo)alkenyl group, in particular methyl,
• the symbols R5 and R6, which are different, represent for one a hydrogen atom and for the other a linear or branched C1-C22 (cyclo)alkyl or (cyclo)alkenyl group,
• q is an average value between 1 and 30,
• W represents a polyblock group comprising different blocks —[B]n— and —[C]p—,
• B representing a group —CH(R3)—CH(R4)—O—, in which R3 and R4, which may be identical or different, represent a hydrogen atom or a linear or branched C1-C22 (cyclo)alkyl or (cyclo)alkenyl group, R3 and R4 being different when one of them represents hydrogen,
• C representing an oxyethylenated group —CH2—CH2—O—(EO),
• n being an average value between 1 and 10,
• p being an average value between 1 and 100,
• said polyblock group W being linked to the unit X via one of its blocks —[B]n—,
• A represents a hydrogen atom, a C1-C6 alkyl radical, an aryl or alkylaryl radical, a halogen atom, a group —CH2—CH(OH)R7, in which the symbol R7 represents a linear or branched or cyclic C1-C22 alkyl or aryl radical, or a group chosen from —SO3M, —OPO3(M)2, —(CH 2)a—COOM, —(CH2)b—SO3M, with a and b ranging from 1 to 6, M representing H, Na, K, Li, N(RR′R″R′″)+ in which the symbols R, R′, R″ and R′″ are identical or different and represent a hydrogen atom or a linear or branched or cyclic, optionally hydroxylated, C1-C22 alkyl radical wherein the process for de-inking old ink-bearing papers comprises two steps:
• the first step comprising a pulping step in which the old ink-bearing papers are placed in contact with said liquid composition and water in a pulper in order to convert the papers into pulp,
• the second step comprising at least one flotation step in which the pulp is diluted in water at unmodified pH in the medium or at a pH modified to basic of between about 8.5 and 9.