Heat transfer sheet

Details Heat transfer sheet Heat transfer sheet

C - Chemistry, Metallurgy

08

F

101/43, 402/497

C08F 8/00 (2006.01) B41M 5/035 (2006.01) B41M 5/26 (2006.01) C08F 8/28 (2006.01)

Patent

CA 1316039

ABSTRACT OF THE DISCLOSURE A heat transfer sheet comprises a substrate sheet and a heat transfer layer laminated on the substrate sheet and containing a dye which can be caused to migrate by heating to be transferred onto a transferable sheet, said heat transfer sheet containing a polyvinyl acetacetal resin as a binder component, the acetal moiety of said polyvinyl acetacetal resin being 50% by weight or more based on the total amount of the resin, and 80% by weight or more of said acetal moiety comprising polyvinyl acetacetal. A process for producing a polyvinyl acetacetal resin by the reaction of a polyvinyl alcohol and acetaldehyde in an aqueous phase in the presence of 4 to 10% by weight of an acid catalyst comprises initiating precipitation of an acetalated product by maintaining the reaction system at a temperature of 8 to 17°C for 30 minutes or longer, and then maintaining said reaction at a temperature of 25 to 40°C.

554392

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