Electrophoretic compositions

An electrophoretic dispersion which comprises electrophoretic pigment-containing microparticles dispersed in a dielectric solvent or solvent mixture and one or more fluorinated additives represented by the following Formulas (A-1), (A-2), (B-1), (B-2) and (B-3):

• Rf—(—X-A-B)n (A-1)
• B-(-A-X—Rf—X′-A′-B′)n (A-2)
• B″-A″-X″—(—Rf—X-A-B-A-X—)m—Rf′—X′-A′-B′ (B-1)
• Rf—X″-A″-B″-A″-X″—(—Rf—X-A-B-A-X—)m—Rf′ (B-2)
• Rf″—X″-A″-B″-A″-X″—(—Rf—X-A-B-A-X—)m—Rf′—X′-A′-B′ (B-3)
• wherein:
• n is an integer which is ≧1;
• m is 0 or an integer which is ≧1;
• Rf, Rf′ and Rf″ are independently a fluorinated moiety;
• X, X′ and X″ are independently absent or a linking group;
• A, A′ and A″ are independently —O—, —C(O)O—, —O(O)C—, —C(O)NR2—, —R2NC(O)—, —R2NC(O)NR3—, —R2NC(O)O— or —OC(O)NR2—, wherein R2 and R3 are independently hydrogen or alkyl;
• B, B′and B″ are independently hydrogen, N≡, optionally substituted alkyl, optionally substituted aryl, optionally substituted heteroalkyl or optionally substituted heteroaryl;
• or N and R2 in —C(O)NR2— or —R2NC(O)— of A form a cyclic moiety with B;
• or N and R3 in —R2NC(O)NR3— of A form a cyclic moiety with B;
• or N and R2 in —R2NC(O)O— or —OC(O)NR2—of A form a cyclic moiety with B, wherein the electrophoretic pigment-containing microparticles are prepared from microencapsulation having a continuous phase which comprises a protective colloid.

An electrophoretic display comprising display cells filled with an electrophoretic dispersion which comprises:

• a) electrophoretic pigment-containing microparticles;
• b) a dielectric solvent or solvent mixture;
• and
• c) one or more highly fluorinated additive represented by the following Formulas (A-1), (A-2), (B-1), (B-2) and (B-3):
• Rf—(—X-A-B)n (A-1)
• B-(-A-X—Rf—X′-A′-B′)n (A-2)
• B″-A″-X″—(—Rf—X-A-B-A-X—)m—Rf′—X′-A′-B′ (B-1)
• Rf″—X″-A″-B″-A″-X″—(—Rf—X-A-B-A-X—)m—Rf′ (B-2)
• Rf″—X″-A″-B″-A″-X″—(—Rf—X-A-B-A-X—)m—Rf′—X′-A′-B′ (B-3)
• wherein:
• n is an integer which is ≧1;
• m is 0 or an integer which is ≧1;
• Rf, Rf′ and Rf″ are independently a fluorinated moiety;
• X, X′ and X″ are independently absent or a linking group;
• A, A′ and A″ are independently —O—, —C(O)O—, —O(O)C—, —C(O)NR2—, —R2NC(O)—, —R2NC(O)NR3—, —R2NC(O)O— or —OC(O)NR2—, wherein R2 and R3 are independently hydrogen or alkyl;
• B, B′ and B″ are independently hydrogen, N≡, optionally substituted alkyl, optionally substituted aryl, optionally substituted heteroalkyl or optionally substituted heteroaryl;
• or N and R2 in —C(O)NR2— or —R2NC(O)— of A form a cyclic moiety with B;
• or N and R3 in —R2NC(O)NR3— of A form a cyclic moiety with B;
• or N and R2 in —R2NC(O)O— or —OC(O)NR2— of A form a cyclic moiety with B. wherein the electrophoretic pigment-containing microparticles are prepared from microencapsulation having a continuous phase which comprises a protective colloid.