Vinyl chloride resin aggregate particles, process for producing same, and glove obtained using same
AssigneeKaneka Corporation
InventorsTakashi Ueda, Kunihiko Matsumura, Morio Ishihara, Manabu Nagamitsu
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Abstract
The present invention provides: vinyl chloride-based resin aggregate particles that can be produced through a heat treatment while inhibiting scale formation within a vessel for the heat treatment and that provide a plastisol with non-infiltrating property and a satisfactory sagging property; a process for producing the particles; and a glove obtained using the particles. The vinyl chloride-based resin aggregated particles are obtained by flocculating a vinyl chloride-based resin through a two-stage heat treatment consisting of a primary heat treatment and a secondary heat treatment.
Claims15
A process for producing the vinyl chloride-based resin aggregate particles, comprising:
- a primary heat treatment step of heating a coagulated latex of the vinyl chloride-based resin at a temperature not lower than Tg and not higher than Tg+35° C. when Tg is a glass transition temperature of the vinyl chloride-based resin;
- and
- a secondary heat treatment step of heating after the primary heat treatment step at a temperature in a range not lower than Tg+35° C. and not higher than Tg+70° C. and higher than the heat treatment temperature for the primary heat treatment step,
- wherein the primary heat treatment is carried out by adding the coagulated latex of the vinyl chloride-based resin into the water bath in a case where the concentration of the polymer solid in the coagulated latex of the vinyl chloride-based resin is 35% by weight or more, and
- in the secondary treatment, a predetermined treatment temperature is set by use of water vapor, wherein the vinyl chloride-based resin comprises aggregate particles have a mean volume particle diameter of 10 to 60 μm, and the percentage of particles having a particle diameter of 10 to 60 μm is at least 50% by volume, a plastisol comprising 100 parts by weight of the aggregate particles and 160 parts by weight of di-2-ethylhexyl phthalate satisfies a relationship of 3≦η70≦η40≦1000 when 1140 is a viscosity at a shear rate of 1 s−1 of a plastisol retained at 40° C. for 10 minutes and η70 is a viscosity at a shear rate of 1 s−1 of a plastisol that has been warmed from 40° C. at 10° C./min. and retained at 70° C. for 3 minutes.
A process for producing the vinyl chloride-based resin aggregate particles, comprising:
- a primary heat treatment step of heating a coagulated latex of the vinyl chloride-based resin at a temperature not lower than Tg and not higher than Tg+35° C. when Tg is a glass transition temperature of the vinyl chloride-based resin;
- and
- a secondary heat treatment step of heating after the primary heat treatment step at a temperature in a range not lower that Tg+35° C. and not higher than Tg+70° C. and higher than the heat treatment temperature for the primary heat treatment step,
- wherein the primary heat treatment step is carried out by mixing the coagulated latex of vinyl chloride-based resin with at least one heating medium selected from the group consisting of water vapor and water bath in a case where the concentration of the polymer solid in the coagulated latex of the vinyl chloride-based resin is less than 35% by weight, and
- in the secondary treatment, a predetermined treatment temperature is set by use of water vapor, wherein the vinyl chloride-based resin comprises aggregate particles have a mean volume particle diameter of 10 to 60 μm, and the percentage of particles having a particle diameter of 10 to 60 μm is at least 50% by volume, a plastisol comprising 100 parts by weight of the aggregate particles and 160 parts by weight of di-2-ethylhexyl phthalate satisfies a relationship of 3≦η70≦η≦1000 when 1140 is a viscosity at a shear rate of 1 s−1 of a plastisol retained at 40° C. for 10 minutes and η70 is a viscosity at a shear rate of 1 s−1 of a plastisol that has been warmed from 40° C. at 10° C./min. and retained at 70° C. for 3 minutes.
Dependencies are inferred from the claim text.