Polypropylene composition and stretched film thereof
AssigneeSumitomo Chemical Company, Limited
InventorsJunichi Kimura, Minoru Takane, Yoichi Obata, Hiroyuki Tanimura
Life of this patent
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Abstract
A polypropylene composition which contains a polypropylene and one or more ingredients selected from an antistatic agent and a surface-treated or untreated fine powdery silica gives a propylene stretched film having a well-balanced transparency, slip property and blocking resistance.
Claims20
A polypropylene composition which comprises:
- (a) 100 parts by weight of a polypropylene, and
- (b) a modifier selected from the group consisting of:
- (ii) 0.2 to 2 parts by weight of an antistatic agent and 0.05 to 1 part by weight of a fine powdery silica having a weight average particle diameter of 1.0 to 2.0 .mu.m as determined by the Coulter counter method, a BET specific surface area of 200 to 400 m.sup.2 /g and a pore volume of 0.5. ml/g or less, and
- (iii) 0.2 to 2 parts by weight of an antistatic agent and 0.05 to 1 part by weight of a surface-treated fine powdery silica obtained by surface-treating a fine powdery silica having a weight average particle diameter of 1.0 to 2.0 .mu.m as determined by the Coulter counter method, a BET specific surface area of 200 to 400 m.sup.2 /g and a pore volume of 0.5 ml/g or less, with a surface treating agent.
A polypropylene stretched film which comprises:
- (a) 100 parts by weight of a polypropylene, and
- (b) a modifier selected from the group consisting of:
- (ii) 0.2 to 2 parts by weight of an antistatic agent and 0.05 to 1 part by weight of a fine powdery silica having a weight average particle diameter of 1.0 to 2.0 .mu.m as determined by the Coulter counter method, a BET specific surface area of 200 to 400 m.sup.2 /g and a pore volume of 0.5 ml/g or less, and
- (iii) 0.2 to 2 parts by weight of an antistatic agent and 0.05 to 1 part by weight of a surface-treated fine powdery silica obtained by surface-treating a fine powdery silica having a weight average particle diameter of 1.0 to 2.0 .mu.m as determined by the Coulter counter method, a BET specific surface area of 200 to 400 m.sup.2 /g and a pore volume of 0.5 ml/g or less, with a surface treating agent.
A method for imparting a well-balanced combination of transparency, slip property and blocking resistance to a polypropylene stretched film which comprises incorporating a modifier selected from the group consisting of:
- (ii) 0.2 to 2 parts by weight of an antistatic agent and 0.05 to 1 part by weight of a fine powdery silica having a weight average particle diameter of 1.0 to 2.0 .mu.m as determined by the Coulter counter method, a BET specific surface area of 200 to 400 m.sup.2/ g and a pore volume of 0.5 ml/g or less, and
- (iii) 0.2 to 2 parts by weight of an antistatic agent and 0.05 to 1 part by weight of a surface-treated fine powdery silica obtained by surface-treating a fine powdery silica having a weight average particle diameter of 1.0 to 2.0 .mu.m as determined by the Coulter counter method, a BET specific surface area of 200 to 400 m.sup.2 /g and a pore volume of 0.5 ml/g or less, with a surface treating agent, into 100 parts by weight of a polypropylene.
Dependencies are inferred from the claim text.