Toner manufacture using chain transfer polyesters
First Claim
1. A method of making polymeric toner particles comprising the steps of:
- heating a diacid and a diol under conditions effective to form a chain transfer polyester, wherein either said diacid or said diol contain a disulfide moiety;
reacting one or more vinyl monomers with said chain transfer polyester in the presence of an initiator under conditions effective to produce a block copolymer having polyester blocks and polyvinyl blocks, wherein said polyester blocks and said polyvinyl blocks are linked together by a sulfide group previously constituting the disulfide moiety; and
reducing said block copolymer to a particulate form to a size suitable for use as an electrographic toner.
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Abstract
Polymeric electrophotographic toner and developer compositions are produced by methods including conventional as well as limited coalescence manufacturing techniques. The compositions are prepared by heating a diacid and a diol under conditions effective to form a chain transfer polyester, wherein either the diacid or the diol contain a disulfide moiety. The polyester is reacted with one or more vinyl monomers to form a block copolymer having polyester blocks linked to polyvinyl blocks by sulfide groups previously constituting the disulfide moiety. The block copolymer is reduced to a particulate form to a size suitable for use as an electrophotographic toner by conventional methods, evaporation limited coalescence, and suspension limited coalescence.
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Citations
38 Claims
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1. A method of making polymeric toner particles comprising the steps of:
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heating a diacid and a diol under conditions effective to form a chain transfer polyester, wherein either said diacid or said diol contain a disulfide moiety; reacting one or more vinyl monomers with said chain transfer polyester in the presence of an initiator under conditions effective to produce a block copolymer having polyester blocks and polyvinyl blocks, wherein said polyester blocks and said polyvinyl blocks are linked together by a sulfide group previously constituting the disulfide moiety; and reducing said block copolymer to a particulate form to a size suitable for use as an electrographic toner. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. An electrographic toner composition comprising:
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a particulate block copolymer having polyester blocks and polyvinyl blocks, wherein said polyester blocks and said polyvinyl blocks are linked together by a sulfide group and addenda selected from the group consisiting of charge control agents and colorants.
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37. An electrographic toner composition comprising:
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a particulate block copolymer which is the polymerization product of a vinyl monomer and a chain transfer polyester, said chain transfer polyester containing a disulfide linkage and addenda selected from the group consisting of charge control agents and colorants. - View Dependent Claims (38)
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Specification