Manufacture of photochromic articles

Details Manufacture of photochromic articles Manufacture of photochromic articles

C - Chemistry, Metallurgy

08

L

31/105, 117/23

C08L 75/04 (2006.01) B32B 27/40 (2006.01) C08K 5/00 (2006.01) G02B 5/23 (2006.01) G03C 1/685 (2006.01) G03C 1/73 (2006.01)

Patent

CA 1339838

A process for producing a polyurethane plastics having photochromic properties, characterised in that the process comprises in a first step incorporating a reversible cleavage photochromic compound into at least one di-isocyanate compound or at least one polyol or a mixture of a di-isocyanate and one or more polyols or into any other component of a mixture which, when polymerised, will yield a polyurethane, combining the mixture from the first step with any other necessary components to enable polymerisation to occur; and polymerising the resultant mixture to form a polyurethane incorporating the said photochromic compound. The photochromic polyurethane plastics of the invention are useful as intermediate layers in glass or plastics laminates for architectural applications or for use in vehicle windows or roof-lights.

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