| 摘要 |
<p>1484879 Powder coating EASTMAN KODAK CO 21 Nov 1974 [21 Nov 1973] 50489/74 Heading B2E [Also in Division C3] Metals may be coated by applying thereto and fusing powders of particle size less than 20 mesh (US Standard) and comprising a high molecular weight crystalline carboxylated poly-α-olefin having a saponification number of 2-12 and which is a carboxylated polyethylene of melt index 5-75 or a carboxylated C 3-12α-olefin homo- or copolymer of melt flow 15-175 and being a reaction product of such polyolefin with an unsaturated polycarboxylic acid, anhydride or ester at below 300‹C in the presence of a free radical source. Examples describe the coating of steel, aluminium, copper and bronze plates with cryoscopically ground reaction products of maleic anhydride with polyethylene and polypropylene.</p> |
