Leuco polymers as bluing agents in laundry care compositions

A leuco polymer comprising a leuco monomer and an alkene, wherein the leuco polymer has a molecular weight of at least 500 and is obtained by polymerization of the leuco monomer and one or more alkene co-monomers, wherein the leuco monomer consists of an alkene covalently bound to a leuco moiety and the leuco monomer has a maximum molar extinction coefficient at a wavelength in the range 400 to 750 nm of less than 1000 M−1 cm−1, wherein the alkene co-monomer(s) have a maximum molar extinction coefficient at a wavelength in the range 400 to 750 nm that is less than 100 M−1 cm−1;

• wherein the leuco moiety is a univalent or polyvalent moiety derived by removal of one or more hydrogen atoms from a structure of Formula (I):
• wherein the ratio of Formula (I) to its oxidized form is at least 1:3;
• wherein each individual Ro, Rm and Rp group on each of rings A, B and C is independently selected from the group consisting of hydrogen, deuterium and R5;
• wherein each R5 is independently selected from the group consisting of halogens, nitro, alkyl, substituted alkyl, aryl, substituted aryl, alkaryl, substituted alkaryl, —C(O)R1, —C(O)OR1, —C(O)O−, —C(O)NR1R2, —OC(O)R1, —OC(O)OR1, —OC(O)NR1R2, —S(O)2R1, —S(O)2OR1, —S(O)2O−, —S(O)2NR1R2, —NR1C(O)R2, —NR1C(O)OR2, —NR1C(O)SR2, —NR1C(O)NR2R3, —OR1, —NR1R2, —P(O)2R1, —P(O)(OR1)2, —P(O)(OR1)O−, and —P(O)(O−)2;
• wherein at least one of the Ro and Rm groups on at least one of the three rings A, B or C is hydrogen;
• each Rp is independently selected from hydrogen, —OR1 and —NR1R2;
• wherein G is independently selected from the group consisting of hydrogen, deuterium, C1-C16 alkoxide, phenoxide, bisphenoxide, nitrite, nitrile, alkyl amine, imidazole, arylamine, polyalkylene oxide, halides, alkylsulfide, aryl sulfide, and phosphine oxide;
• wherein R1, R2 and R3 are independently selected from the group consisting of hydrogen, alkyl, substituted alkyl, aryl, substituted aryl, alkaryl, substituted alkaryl, and R4;
• R4 is an organic group composed of one or more organic monomers with said monomer molecular weights ranging from 28 to 500;
• wherein any charge present is balanced with a suitable independently selected internal or external counterion;
• and
• wherein (i) two Ro groups on different A, B and C rings combine to form a fused ring of five or more members, (ii) an Ro and Rm on the same ring combine to form a fused aliphatic ring or fused aromatic ring, or (iii) an Rm and Rp on the same ring combine to form a fused aliphatic ring or fused aromatic ring.