Method of treatment of an aqueous dispension of microcapsules

Details Method of treatment of an aqueous dispension of microcapsules Method of treatment of an aqueous dispension of microcapsules

1980-08-27

1982-06-22

Marquis, Melvyn I.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

528230, 528488, 528487, 521 64, 521187, C08L 6120

Patent

active

043361706

ABSTRACT:
The residual formaldehyde existing in the aqueous dispersion of microcapsules each having a capsule wall of an aldehyde polycondensation resin formed by polycondensation of formaldehyde with an amine in the presence of an acid catalyst is removed by adjusting the aqueous dispersion to an alkaline state, adding to the aqueous dispersion at least one reaction catalyst which is a member selected from the group consisting of metal hydroxides, phosphates, calcium salts and magnesium salts, and then heating and agitating the aqueous dispersion to cause a reaction to remove residual formaldehyde therefrom.

REFERENCES:
patent: 3516941 (1970-06-01), Matson

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