| 摘要 |
<p>1487028 Anti-adhesive coatings ALLIED CHEMICAL CORP 20 Oct 1975 [21 Oct 1974] 42997/75 Heading B2E [Also in Division C3] Metals may be coated, preferably by powder coating and electrostatic spray techniques. with compositions comprising (1) 25 to 99 weight per cent of a 3, 3, 3-trifluoro-2-trifluoromethyl propene/vinylidene fluoride copolymer and (2) 75 to 1 weight per cent of a low molecular weight particulate polytetrafluoroethylene resin having a maximum particle size of 15 microns and a melt index of 0.5 to 20. The metal may be primed with a coating of copolymer only. The copolymer and/or composition may comprise a divalent metal oxide or salt, e.g. calcium oxide, as thermal stabiliser. Compositions containing 1 to 60 per cent PTFE have improved non- wetting characteristics, particularly for silicone fluids, and those containing 5 to 75 per cent PTFE have improved flexibility. Examples describe the coating of (1) aluminium panels which have been primed with a coating of the copolymer and (2) steel automotive brake wire.</p> |
