摘要:
Organic resin compositions of from about 30 to 90 weight percent of a polyol(allyl carbonate), e.g., diethylene glycol bis(allyl carbonate), and from about 10 to 70, e.g., 10 to 30, weight percent of a mixture of aliphatic urethanes, the terminal portions of which contain allyl or acrylyl functional groups. Polymerizable compositions prepared from such compositions produce castings which have low yellowness (b*) values and which do not pre-release from the molds in which they are formed. Polymerizates prepared from such compositions may be used to prepare photochromic articles, e.g., lenses, by incorporating a photochromic substance, e.g., by thermal transfer, into the polymerizate.
摘要:
Le procédé suivant l'invention est du genre suivant lequel on fait diffuser, de manière contrôlée, au sein d'une matière de base (10), qui, formée d'au moins un monomère partiellement polymérisé et susceptible de conduire à un homopolymère d'indice de réfraction N1, se présente à l'état de gel, une matière d'addition (11), qui est elle-même formée d'au moins un monomère susceptible de conduire à un homopolymère d'indice de réfraction N2 différent de N1. Suivant l'invention, on choisit pour matière d'addition (11) un mélange d'au moins deux monomères (A, B), et on fait varier dans le temps la composition de ce mélange. Application à l'obtention d'éléments en matière synthétique de qualité optique convenant notamment à la réalisation de lentilles ophtalmiques.
摘要:
Organic glasses and surface coatings are prepared, with short hardening cycles, by submitting to the action of U.V. light a liquid polymerizable composition containing at least one di-(allyl carbonate) or poly-(allyl carbonate) of a diol or polyol, a photoinitiator and a vinyl ester monomer and/or an organic peroxide. The composition can additionally contain small amounts of an organic compound selected from among those compounds which are used in the art in order to stabilize the organic polymers to the degrading action of U.V. light. The composition is preferably heated before being treated with U.V. iight.
摘要:
The yellowness of polymerizates formed from polymerizable compositions containing bisphenol bis(allylic carbonate)-functional material is reduced by inclusion of one or more cyclohexenic compounds in the polymerizable compositions.
摘要:
A solid polymeric composition comprising a polymerizate of a polyol (allyl carbonate), fragments of aromatic peroxide initiator, and an effective amount of a 2-hydroxy-4-alkoxy benzophenone. A method of polymerizing a polyol (allyl carbonate) monomer comprising:
a) forming a composition comprising polyol (allyl carbonate) monomer and aromatic peroxide initiator; and b) initiating polymerization; characterized in that the composition initially contains up to 0.01 mole of original aromatic peroxide initiator per equivalent of polyol (allyl carbonate) monomer and an effective amount of a 2-hydroxy-4-alkoxy benzophenone.
A method of reducing ultraviolet induced yellowing of aromatic peroxide initiated poly [polyol (allyl carbonate)] comprising:
a) maintaining the level of original aromatic peroxide initiator up to about 0.01 mole per equivalent of polyol (allyl carbonate) monomer; and b) providing an effective amount of a 2-hydroxy-4-alkoxy benzophenone in the polyol (allyl carbonate) monomer.
A method of reducing yellowing of aromatic peroxide initiated poly [polyol (allyl carbonate) comprising:
a) maintaining the level of original aromatic peroxide initiator up to 0.01 mole per equivalent of polyol (allyl carbonate) monomer and providing an effective amount of a 2-hydroxy-4-alkoxy benzophenone; b) polymerizing the polyol (allyl carbonate) to form a solid polymerizate; and c) continuing the polymerization above 100 degrees Centigrade and low enough to avoid thermal degradation induced yellowness.
摘要:
Describes a polymerizable composition of (a) a first allyl functional monomer, which is selected such that a substantially completely cured polymerizate of the first allyl functional monomer has a 15 second Barcol 934 hardness of at least 40, and (b) a second allyl functional monomer selected from polyether diol bis(allyl carbonate), polylactone diol bis(allyl carbonate) and mixtures thereof. The second allyl functional monomer is present in the composition in an amount to provide a substantially completely cured polymerizate having: (i) improved organic photochromic substance incorporation relative to a substantially completely cured polymerizate of the composition free of monomer (b); and (ii) heat distortion temperature of at least 40 DEG C.
摘要:
Describes a polymerizable composition of (a) a first allyl functional monomer, which is selected such that a substantially completely cured polymerizate of the first allyl functional monomer has a 15 second Barcol 934 hardness of at least 40, and (b) a second allyl functional monomer selected from polyether diol bis(allyl carbonate), polylactone diol bis(allyl carbonate) and mixtures thereof. The second allyl functional monomer is present in the composition in an amount to provide a substantially completely cured polymerizate having: (i) improved organic photochromic substance incorporation relative to a substantially completely cured polymerizate of the composition free of monomer (b); and (ii) heat distortion temperature of at least 40 °C.