Abstract: A damper disc having an output-side plate between a pair of side plates, containing two torsion springs in series in rectangular holes made on the both plates, and disposing a float body freely movable in circumferential direction between the springs. The output-side plate is divided into inside and outside pieces. Each float body is connected by an annular connecting body in such a manner as not to be protrudable. The float body is made of plastic-based resin light in weight and small in friction coefficient.

Abstract: The present invention relates to an elastic paint composition, having a substantially uniform mixture comprising:(A) a water-based polymer emulsion; containing at least one monomer selected from the group consisting of acrylic esters and methacrylic esters having a glass transition temperature of 30.degree. to -60.degree. C., and(B) (1) a reactive compound dissolved in an organic solvent, selected from the group consisting of a compound having at least three methacryloyl radicals and a molecular weight of at least 200 that becomes hardened by the reaction of their methacryloyl radicals with ultraviolet rays, and(2) a compound having at least one double bond and a molecular weight of at least 300 that becomes hardened by the oxidation reaction at the double bond, wherein the amount of said organic solvent is in the range of 5 to 50 percent, based on the weight of water in said mixture.

Abstract: An alkali resistant glass composition comprising the following oxides in a weight percentage composition of 57 - 64% SiO.sub.2, 19 - 23.5% ZrO.sub.2, 0.5 - 2.5% Li.sub.2 O, 11 - 18% Na.sub.2 O, 0 - 6% K.sub.2 O, 0 - 0.5% RO, 0 - 0.5% Al.sub.2 O.sub.3 and 0 - 0.5% M.sub.x O.sub.y wherein R is an alkaline earth metal, M is a metal other than an alkaline earth metal, and x and y are positive integers where (valence of M) multiplied by x = 2y, and satisfying the relationships defined by following expressions (1) and (2):21 .gtoreq. Na.sub.2 O + Li.sub.2 O + K.sub.2 O.gtoreq. 15.5 (1)52 - 2zr.sub.2 O.gtoreq.4Li.sub.2 O - K.sub.2 O.gtoreq.ZrO.sub.2 - 21 (2);and alkali resistant glass fibers prepared therefrom.

Abstract: An alkali resistant glass composition and alkali resistant glass fibers composed of said glass composition which comprises______________________________________ SiO.sub.2 61 - 69 mole% , ZrO.sub.2 11.5 - 12.5 mole% , CaO 2 - 5 mole% , R.sub.2 O 16 - 20 mole% , K.sub.2 O 2 - 5 mole% , B.sub.2 O.sub.3 1 - 4 mole% , TiO.sub.2 0 - 0.3 mole% , and M.sub.x O.sub.y 0 - 1 mole ______________________________________Wherein R.sub.2 O represents the total amount of Na.sub.2 O and K.sub.2 O; M is at least one metal selected from the group consisting of V, Cr, Mn, Fe, Co, Cu, Zn, As, Y, Mo, Cd, Sn, Sb, Hf and Ce; x and y are positive integers with the proviso that the valence of M multiplied by x equals 2y; and the content of fluorides, calculated as F.sub.2, is 0 to 1 mole%, and meeting the following conditions,A. r.sub.2 o + caO .gtoreq. 19 mole%,B. zrO.sub.2 + CaO + B.sub.2 O.sub.3 .ltoreq. 18.5 mole%, andC. the molar ratio of K.sub.2 O/CaO .gtoreq. 0.5.

Abstract: An alkali resistant glass composition comprisingSiO 55 to 69 mol% ZrO.sub.2 11.5 to 14 mol% R.sub.2 O 12 to 23 mol% B.sub.2 O.sub.3 1 to 6 mol% P.sub.2 O.sub.5 1 to 5 mol%Wherein R represents an alkali metal, the content of R'O, R' being an alkaline earth metal, does not exceed 0.5 mol%, and the content of fluorides, calculated as F.sub.2, does not exceed 1 mol%. Alkali resistant fibers prepared from the glass composition, and a cementitious product reinforced with the alkali resistant fibers.