Abstract: Color concentrates comprising a colorant such as a pigment and a polymeric binder, and polymeric binders therefor, said polymeric binders comprising:(a) 70-90 percent of methyl methacrylate, by weight of the polymer;(b) 10-20 percent of methyl acrylate; and(c) from 0 to 10 percent of at least one free radically polymerizable monomer of the formula ##STR1## wherein R.sub.1 is hydrogen or methyl and R.sub.2 is a moiety carrying a functional group.

Abstract: Color concentrates comprising a colorant such as a pigment and a polymeric binder and polymeric binders therefor, said polymeric binders comprising:(a) 70-90 percent of methyl methacrylate, by weight of the polymer;(b) 10-20 percent of methyl acrylate; and(c) from 0 to 10 percent of at least one free radically polymerizable monomer of the formula ##STR1## wherein R.sub.1 is hydrogen or methyl and R.sub.2 is a moiety carrying a functonal group.

Abstract: Color concentrates comprising a colorant such as a pigment and a polymeric binder, and polymeric binders therefor, said polymeric binders comprising:(a) 70-90 percent of methyl methacrylate, by weight of the polymer;(b) 10-20 percent of methyl acrylate; and(c) from 0 to 10 percent of at least one free radically polymerizable monomer of the formula ##STR1## wherein R.sub.1 is hydrogen or methyl and R.sub.2 is a moiety carrying a functional group.

Abstract: What is disclosed are a method for the polymerization of methyl methacrylate or a monomer mixture predominantly comprising methyl methacrylate, which comprises polymerizing in the presence of a free radical-forming initiator and in the presence of a sterically hindered amine containing at least one group having the formula ##STR1## wherein R is the same or different alkyl, R' is hydrogen or alkyl, and A is a 2- or 3-membered alkylene chain which may be bound to a further organic group, polymer sheets prepared by such a method, and the use of such sheets in solaria.

Abstract: A method for making a methyl methacrylate polymer having high resistance to ultraviolet radiation and thermal damage by polymerizing methyl methacrylate or a monomer mixture predominantly comprising methyl methacrylate in the presence of a highly sterically hindered amine such as 2,2,6,6-tetramethyl piperidine.

Abstract: Disclosed is a method for covering a source emitting ultraviolet radiation which method comprises covering said source with an acrylic glass colored with a coloring agent which absorbs in the visible region of the spectrum between 400 nanometers and 550 nanometers and exhibits an absorption of at least 2 percent for any wavelength within this region, and which agent concurrently has an average degree of transmission in the A- and B-region of the ultraviolet spectrum which is not below 55 percent and is not less than 10 percent at any wavelength in this region, said agent being present at a concentration equivalent to 0.0005 to 0.3 percent by weight in a layer, one millimeter thick, of a radiation absorbing matrix. Also disclosed are colored acrylic glass covers for use in such a method.

Abstract: Polymethylmethacrylate sheet comprising light-reflecting particles arranged parallel to the surfaces of the sheet, said particles having a thickness d and an index of refraction n, at a wavelength of infrared light from 800 to 1500 nm, such that d = (0.2 to 0.4) (1/n) microns, said sheet being adaptable for use as a glazing material for buildings or vehicles.