Polyurethane Microspheres

Details Polyurethane Microspheres Polyurethane Microspheres

1998-07-16

1999-01-12

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 65, 521155, C08J 916, C08J 920

Patent

active

058590757

ABSTRACT:
The invention provides a process for the preparation of polyurethane microspheres, which comprises of preparing a solution of diol or polyol having a molecular weight in the range of 200-2000, crosslinker and a catalyst selected from amino or organometallic compounds, dispersing, this solution in dilute solution of stabilizer which consists of a block are chemically and compositionally dissimilar segments and n and m segments are in between 30-115 and 10-60 units respectively, such that the sum of n and m does not exceed 175 units, in an aliphatic hydrocarbon, adding an isocyanate dropwise to this dispersion agitating the mixture at high speed of 100-1200 revolutions per minute, a temperature between 30.degree. to 55.degree. C. to permit the formation of polyurethane microspheres, separating these microspheres by filtration, washing with lower aliphatic hydrocarbon and drying the microspheres under vacuun.

REFERENCES:
patent: 3615972 (1971-10-01), Morehouse, Jr. et al.

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