Plastisol composition
View Patent ↗The present invention provides a plastisol composition which combines low temperature baking property and storage stability which are comparable to those of the prior polyvinyl chloride plastisols and has a low-temperature flexibility. The plastisol composition according to the present invention comprises an acrylic plastisol consisting of a plasticizer having acrylic resin particles and a filler dispersed therein and therewith formulated a blocked urethane prepolymer wherein free isocyanate groups of a terminal isocyanate containing urethane prepolymers have been blocked or a blocked polyisocyanate compound and a latent curing agent which is particulate solid at normal temperature, has a melt point of 60° C. or higher, and is insoluble in the plasticizer at 40° C. or lower.
1. A plastisol composition which comprises an acrylic plastisol consisting of a plasticizer having acrylic resin particles and a filler dispersed therein and therewith formulated a blocked urethane prepolymer wherein free isocyanate groups of a terminal isocyanate containing urethane prepolymer have been blocked or a blocked polyisocyanate compound and a latent curing agent which is particulate solid at normal temperature, has a melt point of 60° C. or higher, and is insoluble in the plasticizer at 40° C. or lower,
wherein said latent curing agent is at least one of
a reaction product of an aliphatic polyamine and a cyclic amine or aromatic polyamine having at least one NH 2 or NH group and a diisocyanate compound, and
those obtained by allowing an addition reaction product of an epoxy compound and one or more selected from the group consisting of aliphatic polyamines, cyclic amines and aromatic polyamines to react with a phenol compound and/or a polycarboxylic acid compound to mask the amino group to be inactive.
2. The plastisol composition according to claim 1 , wherein the ratio by weight of said acrylic resin particle to said blocked urethane prepolymer or blocked polyisocyanate compound is 20/1 to 1/20.
3. The plastisol composition according claim 1 , wherein said latent curing agent is present at an amount of from 1 to 50 parts by weight to 100 parts by weight of said blocked urethane prepolymer or blocked polyisocyanate compound.