Internal release agent, composition including internal release agent, and process for producing a plastic lens using same composition

#The present invention relates to an internal release agent used as an additive in cast polymerization, a composition including the internal release agent, and a process for producing a plastic lens using the composition.

#In the related art, many plastic lenses are produced by a cast polymerization method comprising: injecting a composition including a polymerization reactive compound into a cavity in a mold comprised of a glass mold and a tape or a resin gasket, and performing polymerizing and curing by heating or emitting radiation. Typically, since a cured resin adheres to the glass mold and does not release easily, in consideration of productivity, an internal release agent is added to a composition including a polymerization reactive compound, and many proposals on the internal release agent have been made.

#As a process for producing a plastic lens using an internal release agent, specifically, a process in which alkoxypolyethylene glycol phosphate is used as an internal release agent is representative (Patent Documents 1, 2, 3, and 4). Furthermore, as a cast polymerization method for obtaining a specific structure whose surface is not smooth, a method of producing a prism lens sheet, a Fresnel lens sheet, or a lenticular lens sheet by adding alkoxypolyethylene glycol phosphate or alkoxypolypropylene glycol phosphate to a monomer having a specific structure has also been proposed (Patent Document 5).

#The above-described objects, other objects, features, and advantages will be made clearer from the preferred embodiments described below, and the following accompanying drawings.

#FIG. 1 is a 1H-NMR spectrum chart of phosphoric ester (110A) including phosphodiester (110) obtained in Production Example 1.

#FIG. 2 is an IR spectrum chart of phosphoric ester (110A) including the phosphodiester (110) obtained in Production Example 1.

#An internal release agent according to the present invention, a composition including the internal release agent, and a process for producing a plastic lens using the composition will be described.

#<Internal Release Agent>

#The internal release agent of the present invention includes at least one phosphodiester compound A represented by the following general formula (1). In the case of including two or more phosphodiester compounds A, the groups (R1, R2, R3, and M) in the following general formula (1) may be the same or different for each phosphodiester compound A. The phosphodiester compound A may be a mixture of structural isomers.