Polymerization of polyol (allyl carbonate) using polymerization initiators of short and long half lives

Claim 2

A liquid composition comprising a polyol-(allyl carbonate), a photochromic agent, and a first peroxide polymerization initiator characterised in that a second peroxide polymerization initiator is present, the second initiator having a half life at least five times greater than the first, measured at the same temperature, in polyol(allyl carbonate).

Claim 3

A composition according to claim 1 characterised in that the first peroxide polymerization initiator is isobutyryl peroxide; di(2-ethylhexyl) peroxydicarbonate; acetyl cyclohexane sulfonyl peroxide; di(sec-butyl) peroxydicarbonate; diisopropyl peroxydicarbonate; 2,4-dichlorobenzoyl peroxide; and t-butyl peroxypivalate; and in that the second peroxide polymerization initiator is 2,5-dimethyl-2,5-bis(2-ehtyl hexanoylproxy) hexane; acetyl peroxide; succinic acid peroxide; t-butyl peroxyoctoate; benzoyl-peroxide; p-chlorobenzoyl peroxide; t-butyl peroxyisobutyrate; t-butyl peroxymaleic acid; bis(1-hydroxycyclohexyl) perdxide; 1-hydroxy-1'-hydroperoxy dicyclohexyl peroxide; t-butyl peroxyisopropyl carbonate; 2,5-dimethyl-2,5-bis-(benzoylperoxy) hexane; t-butyl peroxyacetate; methyl ethyl ketone peroxides; di-t-butyl diperoxyphthalate; t-butyl peroxybenzoate; n-butyl 4,4-bis(t-butylperoxy) valerate; 2,5-dimethyl-2,5-bis(t-butylperoxy) hexane; t-butyl hydroperoxide; 3,5-dimethyl-3,5-dihydroxy 1,2-peroxycyclopentane; di't-butyl peroxide; 2,5-dimethyl-2,5-bis(t-butylperoxy) hexyne-3; or 1,1,3,3-tetramethylbutyl hydroperoxide.

Claim 4

A composition according to claim 1 or 2 characterised in that the photochromic agent is an organo metallic.

Claim 5

A composition according to claim 3 characterised in that the photochromic agent is a transition metal carbonyl.

Claim 6

A composition according to claim 4 characterised in that the transition metal carbonyl is tungsten hexacarbonyl.

Claim 7

A composition according to any of claims 1 to 5 characterised in that the polyol(allyl carbonate) is a diol bis(allyl carbonate).

Claim 8

A composition according to any of claims 1 to 6 characterised in that a third peroxide polymerization initiator is present, the third initiator having a half life at least five times greater than the record, measured at the same temperature, a polyol (allyl carbonate).

Claim 11

A method according to claim 8 characterised in that a third peroxide polymerization initiator is added to the polyol(allyl carbonate), the third initiator having a half life at least five times greater than the second, measured at the same temperature, in polyol(allyl carbonate).