摘要:
A method of preparing a shaped article having a photochromic coating thereon, and curable photochromic powder coating compositions are described. The method includes: applying at least one curable powder coating composition to at least a portion of the interior of a mold, e.g., a lens mold, wherein at least one of the applied powder coating compositions includes a photochromic amount of photochromic material; curing at least partially the applied photochromic powder coating; charging a polymerizable organic casting composition into the mold; polymerizing the casting composition; and removing a shaped article having a photochromic coating on at least a portion of its surface from the mold.
摘要:
A coating composition contains a blend of(a) from about 5 percent by weight to about 35 percent by weight of a hydroxyl functional vinyl polymer having at least 2 percent by weight of hydroxyl groups based on the total weight of the vinyl polymer; and(b) from about 65 percent by weight to about 95 percent by weight of an organopolysiloxane containing hydrolyzable groups prepared by the partial hydrolysis of a compound or mixture of compounds represented by the structural formula R.sub.a SiX.sub.(4-a) wherein:R is hydrogen, alkyl, aryl, alkylaryl, arylalkyl, aryloxyalkyl or haloalkyl;X is halogen, OR.sup.1, ##STR1## or the monohydroxy or cyclic C.sub.2 to C.sub.3 residue of a 1,2- or 1,3-glycol, wherein:R.sup.1 is C.sub.1 -C.sub.3 alkyl,R.sup.2 is hydrogen or C.sub.1 -C.sub.4 alkyl,R.sup.3 and R.sup.4 independently are hydrogen, C.sub.1 -C.sub.4 alkyl or C.sub.6 -C.sub.8 aryl,R.sup.5 is C.sub.4 -C.sub.7 alkylene, anda is an integer ranging from 1 to 2, the percentage of (a) and (b) being based on the total weight of (a) and (b).
摘要:
A coating composition containing fluoropolymer adapted for roll coating is provided with a solvent system that is free of isophorone. The solvent system comprises an ester of an aromatic acid, a high molecular weight ketone, a high molecular weight alcohol, a glycol ether ester, and a hydrocarbon solvent having a high evaporation rate.