Prepolymerization of monomer compositions containing diethylene

Details Prepolymerization of monomer compositions containing diethylene Prepolymerization of monomer compositions containing diethylene

1985-03-01

1986-11-18

Michl, Paul R.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

351159, C08F11800

Patent

active

046237089

ABSTRACT:
A prepolymerization step prior to casting reduces shrinkage during polymerization of a composition containing diethylene glycol bis(allyl carbonate) with up to 40% of a vinyl ester, preferably vinyl acetate, and one or more free radical type initiators. The prepolymerization step includes adding a small amount of free radical type initiator, which may be the same or different than that used just prior to casting, and heating to a temperature higher than one hour half-lifetime temperature of the initiator. In this manner, most of the added initiator is consumed and the prepolymerization produces the highest possible conversion while preventing overpolymerization. High yield of lenses of ophthalmic quality is obtained.

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Encyclopedia of Polymer Science and Technology, vol. 1, pp. 799-803, Interscience Publishers, New York, 1964.

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