| 摘要 |
1511053 Thermochromic coatings RAYCHEM CORP 9 April 1975 [11 April 1974] 14522/75 Heading B2E [Also in Division C3] Articles of polymeric material subject to oxidative degradation are coated with compositions comprising (1) a thermochromic pigment, (2) a sulphide, nitride or optionally hydrated sulphate or oxide, or a salt, free acid or organic compound capable of reacting to form such a heating, of zinc or an element of Groups IIIB, IVB or VB, and optionally (3) a binder. The article may be a heat-shrinkable polyolefin sleeve for pipe or cable joints, to indicate when a sufficient temperature has been reached, e.g. to melt adhesive on an interior surface. Examples describe the coating of heat-shrinkable polyethylene sleeves with paints comprising (3) ethylene/ethyl acrylate copolymer, (1) hydrated ferric oxide or hydrated copper carbonate and (2) additives selected from sodium borate, ammonium polyphosphate, zinc borate, tricresyl phosphate, antimony trioxide, boron oxide, barium metaborate, γ-alumina, boric acid, bismuth oxide, sodium phosphate dodecahydrate, boron phosphate, boron nitride, aluminium sulphate octahydrate, arsenic oxide, barium oxide, stannic oxide, yellow lead monoxide, zinc oxide, zinc sulphide, sodium arsenate and calcium metaborate hydrate. |
