| 摘要 |
Compositions which may be extruded to form embossable or printable films comprise polybutene- 1 which is over 80% isotactic as measured by diethyl ether extraction and has a melt index of 0.1 to 20, together with 15 to 50 parts by weight of an inorganic filler an optionally 1 part by weight of a colourant per hundred parts of resin. Specified fillers are silica, calcium carbonate, talc, aluminium silicate, asbestos, mica, calcium silicate, magnesium silicate, barium sulphate, litharge, barium carbonate, aluminium carbonate, magnesium carbonate and alumina. Examples describe films comprising polybutene-1 and (1 and 5) mica, (2) aluminium silicate, (3) silica and (4) talc, the films of Examples 1 to 4 also containing colourants.ALSO:Films printable by embossing and made of compositions comprising polybutene-1 which is at least 80 per cent isotactic and has a melt index of 0.1 to 20 and 15 to 50 parts of inorganic filler per 100 parts by weight of polymer, are coated with a pressure sensitive adhesive. The film may be cut into strips to form adhesive labels. In Example 3 a film made of polybutene, carbon black and silica is coated with an adhesive composition comprising an ethylene/vinyl acetate copolymer, chlorinated polyphenyls and xylene. |
