| 摘要 |
1,190,069. Metal - resin laminates. DEUTSCHE AKADEMIE DER WISSENSCHAFTEN ZU BERLIN. 29 Sept., 1967, No. 44384/67. Heading B5N. [Also in Division C3] Polyolefins and their copolymers are bonded to metals with the use of peroxides of general formula wherein R 1 and R 2 are hydrogen, alkyl radical or C 1 -C 20 aralkyl radicals, R 3 is hydrogen or an alkyl or aralkyl radical, and X is either R 4 (an alkyl or aralkyl radical) or one of the substituents -C(OOR 3 )R 1 R 2 , -C#CR 4 , -C#C-C(OOR 3 )R 1 R 2 , -(CH 2 ) n -C#CR 4 or -(CH 2 ) n -C#C-C(OOR 3 )R 1 R 2 , n being 1, 2, 3 or 4, by either (i) mixing the polyolefin and peroxide at an elevated temperature before application to the metal, or (ii) applying a peroxide solution or dispersion to one or both of the surfaces to be bonded; in both cases the bond is thereafter formed by pressing at elevated temperature. Peroxides can be combined with polyolefins by mixing therewith at up to 200‹ C. in amount 0À1-10% by weight and thereafter extruding to form a film. If peroxide is applied as a solution or dispersion to preformed surfaces a polyolefin of molecular weight 5000-30,000 can be present. Pressing may take place at 160-220‹ C. Other specified additives may be present. The peroxide causes cross-linking of the polyolefin. Specified polyolefins are polyethylene, polypropylene and butadiene polymers. The metal may be copper, iron or aluminium. Peroxides mentioned in examples are 2,5-dimethyl-2,5- di - (tert - butylperoxy) - hex - 3 - yne and 2,7- dimethyl - 2,7 - di - (tert - butylperoxy) - octa- 3,5-diyne. |
