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US 5,886,067 AGranted
Liquid inks using a controlled crystallinity organosol
AssigneeMinnesota Mining and Manufacturing Company
InventorsWu-Shyong Li, James A. Baker, Jai Venkatesan, Gay L. Herman
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Abstract
A liquid ink composition containing organosols having side-chain or main-chain crystallizable polymeric moieties is described. The incorporation of organosols having crystallizable polymeric moieties into the ink compositions provide improved blocking resistance and improved erasure resistance when used in ink transfer, ionographic, electrographic and electrophotographic color printing or proofing processes.
Claims13
A liquid ink comprising:
- (a) a carrier liquid having a Kauri-butanol number less than 30;
- and
- (b) an organosol comprising
- (i) a graft (co)polymeric steric stabilizer having a weight-average molecular weight greater than or equal to 5,000 Daltons and a polydispersity less than 15, said steric stabilizer being covalently bonded to a thermoplastic (co)polymeric core that is insoluble in said carrier liquid,
- wherein the weight ratio of said (co)polymeric steric stabilizer to said thermoplastic (co)polymeric core is between 1/1 and 1/15, and said (co)polymeric steric stabilizer comprises a side-chain or main-chain crystallizing polymeric moiety that independently and reversibly crystallizes at or above 22.degree. C.
2 more elements
A liquid ink comprising:
- (a) a carrier liquid having a Kauri-butanol number less than 30;
- and
- (b) an organosol comprising
- (i) a (co)polymeric graft stabilizer having a plurality of hydroxyl groups, a weight-average molecular weight greater than or equal to 5,000 Daltons and a polydispersity less than 15, said steric stabilizer being covalently bonded by means of a grafting site to a thermoplastic (co)polymeric core that is insoluble in said carrier liquid,
- wherein said grafting site is formed by reacting at least one of said plurality of hydroxyl groups of said steric stabilizer with an ethylenically unsaturated aliphatic isocyanate to form a polyurethane linkage, the weight ratio of said (co)polymeric steric stabilizer to said thermoplastic (co)polymeric core is between 1/1 and 1/15 and said (co)polymeric steric stabilizer comprises a side-chain or main-chain crystallizing polymeric moiety that independently and reversibly crystallizes at or above 22.degree. C.
2 more elements
Dependencies are inferred from the claim text.