Abstract: A method is provided for the preparation of homogeneous copolymers having a redetermined equilibrium water content (EWC) value formed by the addition polymerization of a mixture of ethylenically unsaturated monomer A and ethylenically unsaturated monomer B, for example, 2-hydroxyethyl methacrylate and hydroxypropyl methacrylate. The method requires determining the EWC values of the hydrogel homopolymer of hydrophilic monomer A (homopolymer A) and the hydrogel homopolymer of hydrophilic monomer B (homopolymer B); determining the relationship of the EWC values of the homogeneous copolymers AB versus the chemical composition of said copolymers AB; selecting the targeted EWC value and determining the chemical composition of copolymer AB having the targeted EWC value; forming a polymerizable mixture of monomer A and monomer B in amounts sufficient to yield copolymer AB having the targeted EWC value; and effect the polymerization reaction to yield copolymer AB characterized by the targeted EWC value.

Abstract: A water compatible terpolymer for sealing and coating building materials which protects surfaces from environmental staining agents. The terpolymer is created by polymerizing a HEMA:SMA co-polymer with another monomer which contains either free acid or base groups. The resultant terpolymer is water solution after neutralization. Water is then added to bring the solvent level to 40% maximum and the solids level to 8%.

Abstract: A disposable tint pack assembly is provided for use in a contact lens tinting apparatus. This disposable assembly includes a plurality of disposable packages, each for containing a supply of a given fluid material for use in a contact lens tinting process carried out by the apparatus. A fluid dispensing apparatus is coupled with each of these packages and is selectively operable for dispensing the fluid contained therein, preferably in premeasured, incremental quantities. A tray-like carrier member is provided for supporting and locating all of the packages in predetermined relative positions for use in a given order in the lens tinting process carried out by the tinting apparatus. A retaining structure is provided for releasably holding each of the packages in the desired position in the carrier tray. The invention also extends to individual portions or sub-assemblies of the foregoing tint pack assembly.

Abstract: An apparatus for tinting a soft contact lens which is received in a fixture including an inlet and an outlet for directing predetermined fluids therethrough for engagement with predetermined surfaces of the contact lens. The apparatus comprises a carrier for carrying the fixture in a predetermined orientation; a guide arrangement for defining a predetermined path of travel; a motive assembly for propelling the carrier along the predetermined path; and a plurality of fluid application stations arranged along the path, each fluid application station including a fluid release member. The guide track and the motive assembly cooperate for aligning the inlet of the fixture with each fluid release member sequentially as the carrier travels along the predetermined path, for delivering a quantity of fluid to the fixture and the contact lens therein.

Abstract: A photosensitive composition is prepared comprising a diazonium compound and a polymer containing at least 50% by weight of the recurring unit represented by the following general formula (I): ##STR1## wherein R.sub.1 represents hydrogen atom or methyl group, R.sub.2 represents hydrogen atom or a methyl, ethyl or chloromethyl group and n is an integer of 1 to 10.

Abstract: A solar collector comprised of a frame and a plurality of tubular collector elements. Each collector element is comprised of an outer transparent tube, a metallic absorber tube, and an intermediate transparent tube which encloses the absorber tube. The absorber tube is coated with an absorptive coating and the outer tube is coated over a significant portion of its circumference with a reflective coating to reflect solar radiation onto the absorber tube. The intermediate tube serves to reduce convective and conductive heat losses, provides a structural support for the absorber tube, and chemically isolates the coated absorber tube from the reflective coating on the outer tube.