Patent GB-975604-A (GB)
Title: Roof for a building
IPC: E04D5/10
Filed: 1962-12-18
Abstract: The Specification gives a resume of prior room temperature vulcanising rubber-forming compositions.  Two-package systems described are:  (A) U.S.A. Specification 2,833,740 in which the system consists of (1) a liquid acid-free diorganopolysiloxane, (2) from 0.1 to 50% (by wt. of the siloxane) of a non-volatile alkylpolysilicate (alkyl radicals of less than 6 C atoms) and (3) from 0.01 to 10% of a condensation product of an aliphatic aldehyde and an aliphatic primary amine, both of which contain less than 8 C atoms; (B) in a modification, as described in U.S.A.  Specification 2,927,907, ingredient (2) is a hydrocarbon silicate in which the hydrocarbon radicals contain less than 8 C atoms and catalyst (3) is a carboxylate (of less than 16 C atoms) of a metal ranging from Pb to Mn in the electromotive series of metals; (C) an improvement of (B) is shown in Specification 844,128 in which the siloxane (1) contains terminal Si-OH groups, the cross-linking agent (2) is either a silicate of the formula R14-m-Si(OCH2.CH2OR11)m, in which R1 is a monovalent hydrocarbon or halohydrocarbon radical of less than 7 C atoms, or a partial hydrolysate thereof, and (3) is a carboxylate of a metal above H in the electromotive series of metals; (D) U.S.A. Specification 2,843,555, in which siloxane (1) is a liquid linear siloxane containing terminal Si-OH groups, (2) is an alkyl silicate and (3) is a carboxylate of Pb, Sn, Zr, Sb, Fe, Cd, Ba, Ca, Ti, Bi or Mn; (E) Specification 804,199 in which the system comprises (1) 95 to 99.9% of a hydroxylated siloxane, (2) 0.01 to 5% of an organohydrogensiloxane and (3) as curing catalyst a metal carboxylate or an organometallic compound, such as tetra-lauryl tin or tetraphenyl lead; (F) Specification 841,825, in which siloxane (1) has terminal Si-bonded-OH or alkoxy radicals, (2) is a polyfunctional silane, siloxane, silicate, surface-modified silica filler or a titanium ester, and (3) a catalyst, numerous examples of which are given.  One-package systems described are: (G) Specifications 862,576, 884,687 and 894,758, and these are based on acyloxysiloxanes which are vulcanised by exposure to moisture; (H) Specification 975,603 in which the siloxane consists essentially of units of the formula <FORM:0975604/C3/1> wherein X is R2C= or <FORM:0975604/C3/2> in which R11 is a divalent hydrocarbon or halohydrocarbon radical, R is a monovalent hydrocarbon radical, R1 is R, H or cyanoalkyl, b= 0 to 2, d=1 to 3 and c=0 to 3, and is cured by exposure to moisture in the presence or absence of a curing catalyst; (I) Specification 933,417 in which the system comprises a siloxane containing Si-bonded alkoxyethoxy radicals and a condensation catalyst which is active at room temperature to form a liquid system which is stable in the absence of moisture but cures to a solid at room temperature in the presence of moisture; (J) Specification 962,061, in which the system comprises (1) a siloxane containing terminal Si-OH groups, (2) a silane of the formula R1xSi(OR11)4-x, wherein R1 is a monovalent hydrocarbon, halohydrocarbon or cyanoalkyl radical of 1 to 18 C atoms, R11 is an aliphatic or halo-aliphatic hydrocarbon radical of less than 5 C atoms and x has an average value of 0 to 1, and (3) at least 0.1% of an organotitanium compound, and is cured on exposure to moisture; and (K) Specification 957,554, in which the system is based upon certain silcarbane-siloxanes containing Si-bonded alkoxy radicals and which cure on exposure to moisture in the presence of suitable catalysts.  All the above compositions may contain the customary fillers and additives.ALSO:A permanently waterproofed roof comprises a load-bearing thin shell member, preferably of reinforced concrete, and a thin membrane of a silicone rubber.  The waterproofing is effected by applying, preferably by spraying, to the external surface of the roof a room temperature vulcanizing silicone rubber-forming composition.  Numerous examples of known silicone rubber-forming compositions are given (see Division C3).