Low volatility water repellents

Details Low volatility water repellents Low volatility water repellents

1988-07-14

1989-10-17

Lieberman, Paul

Compositions: coating or plastic

Coating or plastic compositions

Coating repellent

106 12, 10628713, 10628714, 10628716, C09K 319

Patent

active

048744310

ABSTRACT:
A method of reducing the volatility and decreasing the evaporation loss of water repellent compositions containing a solution of an alkylalkoxysilane and a carrier prior to application of the composition to a porous substrate by acidifying the solution in order to cause rapid equilibriation of the alkylalkoxysilane and the carrier to a constant steady state condition, adding to the acidified hydrolyzed alkylalkoxsilane solution at least one metal salt catalyst to further increase the hydrolysis rate of the alkylalkoxysilane and to complete the hydrolysis and the condensation of the alkylalkoxysilane, adding at least one surface depositing agent to the acidified hydrolyzed alkylalkoxysilane solution in order to reduce evaporation of un-reacted alkylalkoxysilane, and maintaining the solution in a substantially anhydrous condition, so that the amount of hydrolyzed silane absorbed by the porous substrate and the percentage of water excluded from the porous substrate by the repellent composition are increased.

REFERENCES:
patent: 3388089 (1968-06-01), Brown
patent: 3766123 (1973-10-01), Burnie et al.
patent: 3832203 (1974-08-01), Saunders et al.
patent: 4209432 (1980-06-01), Roth
patent: 4436856 (1984-03-01), Huhn et al.
patent: 4478911 (1984-10-01), Price
patent: 4648904 (1987-03-01), DePasquale et al.

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