Process for producing a polyvinyl acetacetal resin for use in a

Details Process for producing a polyvinyl acetacetal resin for use in a Process for producing a polyvinyl acetacetal resin for use in a

1989-10-30

1991-11-26

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525 56, C08F 800

Patent

active

050682822

ABSTRACT:
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.degree. to 17.degree. C. for 30 minutes or longer, and then maintaining said reaction at a temperature of 25.degree. to 40.degree. C.

REFERENCES:
patent: 4533697 (1985-08-01), Degeilh
patent: 4541830 (1985-09-01), Hotta et al.
patent: 4614521 (1986-09-01), Niwa et al.

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