Production process of non-flying plastic mircoballoons
AssigneeDainichiseika Color & Chemicals Mfg. Co., Ltd.
InventorsYoshihiro Shigemori, Osamu Saito, Yoshihiro Usui
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Abstract
Non-flying plastic microballoons are produced by bringing unexpanded, expandable plastic microballoons, which have been heated to a temperature lower than an expansion starting temperature thereof, and a mixture of a wetting agent and gas, the mixture having been heated to a temperature at least equal to the expansion starting temperature of the expandable plastic microballoons, into contact with each other to cause expansion of the expandable plastic balloons, and then cooling the resulting expanded plastic balloons.
Claims5
A process for the production of non-flying plastic microballoons, which comprises bringing unexpanded, expandable plastic microballoons, which have been heated to a temperature lower than an expansion starting temperature thereof, and a mixture of a wetting agent and gas, said mixture having been heated to a temperature at least equal to said expansion starting temperature of said expandable plastic microballoons, into contact with each other to cause expansion of said expandable plastic balloons, and then cooling the resulting expanded plastic balloons,
- wherein said wetting agent is an organic liquid having a boiling point higher than the temperature to which said mixture of said wetting agent and said gas is heated.
Dependencies are inferred from the claim text.