Non-aqueous solvent-free process for making UV curable adhesives and sealants from epoxidized monohydroxylated diene polymers

本发明是制备UV可固化粘合剂，密封剂，涂料，油墨，柔性印版，层压粘合剂，纤维，垫圈，和相关组合物，薄膜，和薄零件的方法，其中环氧化单羟基化聚二烯聚合物用作组合物的粘结剂，该聚合物包括至少两种不同二烯单体，其中至少一种是提供适于环氧化的不饱和度的二烯单体。优选的环氧化单羟基化聚合物是异戊二烯和丁二烯的嵌段共聚物，其中羟基连接于聚合物分子的一端。这些聚合物可以是氢化或非氢化的。该方法涉及将以上聚合物或该聚合物与一种或多种其它配制成分的结合与不溶性光引发剂一起混合，该光引发剂优先选自三芳基锍盐。混合物然后在高速混合机，优选高速圆盘分散机中在大约200到2000cm/sec的桨尖速度和在25℃-130℃，优选40℃-100℃下经受混合条件。该方法高度适于制备能够加到粘合剂、涂料、密封剂等配制料中以进行快速UV固化的稳定阳离子光引发剂浓缩物。 This invention is a process for making UV curable adhesives, sealants, coatings, ink, flexible printing plates, laminating adhesives, fibers, gaskets, and related compositions, films, and thin parts, wherein an epoxidized monohydroxylated polydiene polymer comprised of at least two different diene monomers wherein at least one is a diene monomer which yields unsaturation suitable for epoxidation is used as the binder for the composition. The preferred epoxidized monohydroxylated polymers are block copolymers of isoprene and butadiene wherein a hydroxyl group is attached at one end of the polymer molecule. These polymers may be hydrogenated or unhydrogenated. The process involves mixing the above polymer or the polymer with one or more other formulating ingredients together with and insoluble photoinitiator which is preferably selected from the group consisting of triaryl sulfonium salts. The mixture is then subjected to mixing conditions in a high speed mixer, preferably a high speed disk disperser, at a blade tip speed of from 200 to 2000 cm/sec at a temperature from 25 to 130° C., preferably from 40 to 100° C. This process is highly suited for making stable cationic photoinitiator concentrations that can be added to adhesive, coating, or sealant formulations to effect rapid UV cure.