Low viscosity polythiol and method therefor

摘要

A method and composition for decreasing the viscosity of mercaptan terminated polymers. The method involves adding thiol terminated trithio-orthoformate polycondensates to the mercaptan terminated polymer to achieve desired decreases in viscosities without adversely affecting other physical properties. The polycondensates have the formula (HS-R-S-)2CH-S-R'-S[-CH(-S-R''-S)2-]n(H)x wherein R, R', and R'' are alkylene, arylene, alkylene thioether, or alkylene ether, either the same or different; n is 0-10; and x is n+1.