Laminating propylene/1-butene random copolymer composition and composite film using the same
a technology of propylene and random copolymer composition, which is applied in the direction of combination recording, synthesizing resin layered products, and recording information storage, etc., can solve the problems of poor heat sealing of heat seal portions and fusion welding, increase of laminating, and mold problems, and achieve blockage resistance and hot tack, excellent low-temperature sealing properties
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production example 1
[0177] Production of propylene / 1-butene random copolymer (PBR-1)
[0178] 900 ml of hexane and 60 g of 1-butene were charged into a 2-lit. autoclave satisfactorily purged with nitrogen. 1 mmol of triisobutylaluminum was added thereto and heated to 70.degree. C. Subsequently, propylene was fed to a total pressure of 7 kg / cm.sup.2-G, and 0.30 mmol of methylaluminooxane and 0.001 mmol, in terms of Zr atom, of rac-dimethylsilylene-bis[1-(2-methyl-4-phenylindenyl)]zirconium dichloride were added. Polymerization was carried out for 30 min while continuously supplying propylene and while maintaining the total pressure at 7 kg / cm.sup.2-G. After the polymerization, deaeration was conducted and a polymer was recovered in a large volume of methanol. The polymer was dried in vacuum at 110.degree. C. for 12 hr.
[0179] The yield of the thus obtained polymer (propylene / 1-butene random copolymer (PBR-1)) was 39.7 g, so that the polymerization activity was 79 kg-polymer / mmolZr-hr.
[0180] This polymer was...
production example 2
[0181] Production of propylene / 1-butene random copolymer (PBR-2)
[0182] 830 ml of hexane and 100 g of 1-butene were charged into a 2-lit. autoclave satisfactorily purged with nitrogen. 1 mmol of triisobutylaluminum was added thereto and heated to 70.degree. C. Subsequently, propylene was fed to a total pressure of 7 kg / cm.sup.2-G, and 1 mmol of triethylaluminum and 0.005 mmol, in terms of Ti atom, of titanium catalyst supported on magnesium chloride were added. Polymerization was carried out for 30 min while continuously supplying propylene and while maintaining the total pressure at 7 kg / cm.sup.2-G. After the polymerization, deaeration was conducted and a polymer was recovered in a large volume of methanol. The polymer was dried in vacuum at 110.degree. C. for 12 hr.
[0183] The yield of the thus obtained polymer (propylene / 1-butene random copolymer (PBR-2)) was 33.7 g, so that the polymerization activity was 14 kg-polymer / mmolZr-hr.
[0184] This polymer was analyzed and it was found th...
example 1
[0185] Preparation of propylene / 1-butene random copolymer composition
[0186] 90 parts by weight of propylene / 1-butene random copolymer (PBR-1) obtained in Production Example 1 and 10 parts by weight of low-density polyethylene (density: 0.917 g / cm.sup.3, MFR: 7 g / 10 min, crystallinity: 4%, content of structural units derived from ethylene: 80 mol % and content of structural units derived from propylene: 20 mol %) were mixed together in molten state at 280.degree. C., thereby obtaining a propylene / 1-butene random copolymer composition.
[0187] An extrusion coating (laminate molding) of this composition was performed on a biaxially oriented polypropylene film layer having a thickness of 20 .mu.m under the following conditions, thereby forming a composite film.
[0188] Molding conditions
[0189] Film layer construction and thickness of each layer: thickness of biaxially oriented polypropylene film layer (substrate film layer) / thickness of composition layer=20 .mu.m / 20 .mu.m,
[0190] Molding mac...
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