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1. US20080188622 - PROPYLENE-BASED COPOLYMER MATERIAL, FILM MADE THEREFROM, AND METHOD FOR PRODUCING PROPYLENE-BASED COPOLYMER MATERIAL

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Claims

1. A propylene-based copolymer material which comprises from 1 to 10% by weight of a propylene-based copolymerized component (1) defined below and from 90 to 99% by weight of a propylene-based copolymerized component (2) defined below and which has a melting point not higher than 140° C., where the amounts are based on the total weight of the propylene-based copolymerized components (1) and (2), wherein the propylene-based copolymerized component (1) is a propylene-based copolymerized component which comprises from 89 to 97% by weight of structural units derived from propylene, from 0 to 1.5% by weight of structural units derived from ethylene and from 3 to 10% by weight of structural units derived from 1-butene and which has a melting point within the range from 145° C. to 155° C., where the amounts are based on the weight of the component (1), and
the propylene-based copolymerized component (2) is a propylene-based copolymerized component which comprises from 80 to 94% by weight of structural units derived from propylene, from 0 to 10% by weight of structural units derived from ethylene and from 0 to 20% by weight of structural units derived from 1-butene, where the amounts are based on the weight of the component (2).
2. The propylene-based copolymer material according to claim 1, wherein the content of the structural units derived from ethylene of the propylene-based copolymerized component (1) is 0% by weight.
3. A film comprising the propylene-based copolymer material according to claim 1.
4. The film according to claim 3, wherein the film is an unoriented film.
5. A method for producing the propylene-based copolymer material according to claim 1, wherein the propylene-based copolymerized component (1) is produced in a medium composed mainly of liquid propylene and the propylene-based copolymerized component (2) is produced in a medium composed mainly of gaseous propylene.
6. The method according to claim 5, wherein the content of ethylene contained in the medium composed mainly of liquid propylene used for the production of the propylene-based copolymerized component (1) is 0% by weight.