Abstract: In an aspect, a composition comprises an alkali-swellable copolymer that is derived from a mixture comprising 15 to 50 wt % of an ethylenically unsaturated carboxylic acid; 30 to 70 wt % of an ethylenically unsaturated C1-2 alkyl carboxylate ester; and 15 to 40 wt of a nonionic ethylenically unsaturated surfactant monomer of the Formula (A); and less than or equal to 0.15 wt of a multifunctional monomer contains greater than 1 vinyl group. The composition has a pH of greater than or equal to 6. The composition can optionally comprise a surfactant.

Abstract: Electric signals are recorded on a recording medium having a light sensitivity extending to wavelengths shorter than 475 nm, with an array of electrically switched lanthanum modified lead zirconate titanate (PLZT) light gates located between a light polarizer and a complementary light analyzer. The light gates are illuminated through the polarizer with light whose wavelength essentially is longer than 475 nm. Such light is selectively gated through electrically switched light gates through the analyzer and to the recording medium having a light sensitivity extending to wavelengths shorter than 475 nm. Information recordings may be made in this manner over extended periods of time without the typical performance degradation through photoinduced birefringence observed with conventionalPLZT electrooptic shutters.