The present invention is directed to a polymerizable composition comprising (A) a reaction product of: (a) diethyleneglycol bischloroformate, ethyleneglycol bischloroformate, or combinations thereof; (b) allyl alcohol; (c) optionally, a cyclic polyol selected from the group consisting of a cycloaliphatic polyol having at least one secondary hydroxyl group, a heterocyclic polyol having primary and/or secondary hydroxyl groups, and mixtures thereof; and (d) optionally, at least one linear or branched aliphatic polyol having two to six hydroxyl groups; and (B) an organic peroxide comprising at least three peroxide groups. A polymerizate and/or an optical article comprising the polymerizable compositions of the invention are also provided.

In an embodiment, a polycarbonate polymerization process comprises interfacially polymerizing a carbonate compound and dihydroxy compound in the presence of an interfacial catalyst to form a polycarbonate and adding a viscosity reducing agent and a transesterification catalyst to polycarbonate upstream of a first filter to form an adjusted polycarbonate. The first filter can be replaced with a replacement filter and the adjusted polycarbonate can be introduced to the replacement filter. The flow can be diverted to a replacement filter. The process further comprises reducing the addition rate of the viscosity reducing agent and the transesterification catalyst until the addition rate is 0 mol/hr.

Provided is a polycarbonate-modified acrylic resin which is a reaction product of a polycarbonate diol (A) obtained by using 1,5-pentanediol and 1,6-hexanediol as raw materials, and an unsaturated monomer mixture (B) containing methyl methacrylate, an unsaturated monomer (b1) having a hydroxyl group, an unsaturated monomer (b2) having a carboxyl group, and an unsaturated monomer (b3) having an alkyl group having 2 to 8 carbon atoms as essential components, wherein the mass proportion of the unsaturated monomer (b2) in the unsaturated monomer mixture (B) is in the range of 2 to 10% by mass. The polycarbonate-modified acrylic resin is advantageous in that a coating film having high adhesion to a plastic substrate and having excellent water-resistant adhesive property and excellent fragrance resistance can be obtained from the resin, and therefore can be advantageously used in a coating composition.

The present invention is directed to a polymerizable composition comprising (A) a reaction product of: (a) diethyleneglycol bischloroformate, ethyleneglycol bischloroformate, or combinations thereof; (b) allyl alcohol; (c) optionally, a cyclic polyol selected from the group consisting of a cycloaliphatic polyol having at least one secondary hydroxyl group, a heterocyclic polyol having primary and/or secondary hydroxyl groups, and mixtures thereof; and (d) optionally, at least one linear or branched aliphatic polyol having two to six hydroxyl groups; and (B) an organic peroxide comprising at least three peroxide groups. A polymerizate and/or an optical article comprising the polymerizable compositions of the invention are also provided.

An object of the present invention is to provide a phase difference film that can exhibit sufficient reciprocal wavelength dispersibility. The present invention includes a copolymer containing at least one selected from a unit represented by Formula (1) and a unit represented by Formula (2), and a unit represented by Formula (3), in which 20 nm<Re (548)<300 nm, 0.5<Re (446)/Re (548)<1.0, and 1.0<Re (629)/Re (548)<2.0. Here, Re (446), Re (548), and Re (629) represent in-plane retardations at wavelengths of 446 nm, 548 nm, and 629 nm, respectively.

Provided is a polycarbonate-modified acrylic resin which is a reaction product of a polycarbonate diol (A) obtained by using 1,5-pentanediol and 1,6-hexanediol as raw materials, and an unsaturated monomer mixture (B) containing methyl methacrylate, an unsaturated monomer (b1) having a hydroxyl group, an unsaturated monomer (b2) having a carboxyl group, and an unsaturated monomer (b3) having an alkyl group having 2 to 8 carbon atoms as essential components, wherein the mass proportion of the unsaturated monomer (b2) in the unsaturated monomer mixture (B) is in the range of 2 to 10% by mass. The polycarbonate-modified acrylic resin is advantageous in that a coating film having high adhesion to a plastic substrate and having excellent water-resistant adhesive property and excellent fragrance resistance can be obtained from the resin, and therefore can be advantageously used in a coating composition.

In an embodiment, a polycarbonate polymerization process comprises interfacially polymerizing a carbonate compound and dihydroxy compound in the presence of an interfacial catalyst to form a polycarbonate and adding a viscosity reducing agent and a transesterification catalyst to polycarbonate upstream of a first filter to form an adjusted polycarbonate. The first filter can be replaced with a replacement filter and the adjusted polycarbonate can be introduced to the replacement filter. The flow can be diverted to a replacement filter. The process further comprises reducing the addition rate of the viscosity reducing agent and the transesterification catalyst until the addition rate is 0 mol/hr.