Claims
- 1. A polypropylene composite film comprising:(I) a crystalline polypropylene layer, and (II) a propylene/1-butene random copolymer layer laminated on at least one surface of the crystalline polypropylene layer (I): said propylene/1-butene random copolymer (II) having the following properties: (1) the copolymer contains 60 to 85% by mol of constituent units derived from propylene and 40 to 15% by mol of constituent units derived from 1-butene, (2) the intrinsic viscosity, as measured in decahydronaphthalene at 135° C., is in the range of 1 to 5 dl/g, (3) the molecular weight distribution, Mw/Mn, as determined by gel permeation chromatography, is not more than 3, and (4) a parameter B value, which indicates the randomness of the copolymer, is in the range of 1.0 to 1.5, wherein B=P12/(2P1·P2) whereP1 is a first monomer content fraction, P2 is a second monomer content fraction, and P12 is a proportion of the first monomer—second monomer sequences to the total diad sequences.
- 2. The polypropylene composite film as claimed in claim 1, wherein the crystalline polypropylene layer (I) is an unstretched, monoaxially stretched or biaxially oriented crystalline polypropylene layer.
- 3. The polypropylene composite film as claimed in claim 1 or claim 2, wherein the parameter B value, which indicates the randomness of the copolymer, of the propylene/1-butene random copolymer (II) is in the range of 1.0 to 1.3, and the copolymer (II) further has the following properties:(5) the melting point Tm, as measured by differential scanning calorimeter, is in the range of 60 to 140° C., and the melting point Tm and the content M of constituent units derived from 1-butene measured in % by mol satisfy the following relation: —2.6M+130≦Tm≦−2.3M+155 and(6) the crystallinity C, as measured by X-ray diffractometry, and the content M of constituent units derived from 1-butene measured in % by mol satisfy the following relation: C≦−1.5M+75.
- 4. The polypropylene composite film as claimed in claim 1 or claim 2, wherein the propylene/1-butene random copolymer (II) is prepared by copolymerizing propylene and 1-butene in the presence of an olefin polymerization catalyst comprising:(a) a transition metal compound represented by the following formula (I): wherein M is a transition metal of Group IVb, Vb or VIb of the periodic table,R1 and R2 are each a hydrogen atom, a halogen atom, a hydrocarbon group of 1 to 20 carbon atoms, a halogenated hydrocarbon group of 1 to 20 carbon atoms, a silicon-containing group, an oxygen-containing group, a sulfur-containing group, a nitrogen-containing group or a phosphorus-containing group, R3 is a secondary or tertiary alkyl group of 3 to 20 carbon atoms or an aromatic group, R4 is hydrogen or an alkyl group of 1 to 20 carbon atoms, X1 and X2 are each a hydrogen atom, a halogen atom, a hydrocarbon group of 1 to 20 carbon atoms, a halogenated hydrocarbon group of 1 to 20 carbon atoms, an oxygen-containing group or a sulfur-containing group, and Y is a divalent hydrocarbon group of 1 to 20 carbon atoms, a divalent halogenated hydrocarbon group of 1 to 20 carbon atoms, a divalent silicon-containing group, a divalent germanium-containing group, a divalent tin-containing group, —O—, —CO—, —S—, —SO—, —SO2—, —NR5—, —P(R5)—, —P(O)(R5)—, —BR5— or —AlR5— (R5 is hydrogen, a halogen atom, a hydrocarbon group of 1 to 20 carbon atoms or a halogenated hydrocarbon group of 1 to 20 carbon atoms); (b) (b-1) an organoaluminum oxy-compound and/or (b-2) a compound which reacts with the transition metal compound (a) to form an ion pair; and, optionally, (c) an organoaluminum compound.
- 5. The propylene composite film as claimed in claim 4, wherein R1 in the formula (I) representing the transition metal compound (a) is methyl.
- 6. A polypropylene composite film comprising:(I) a crystalline polypropylene layer, and (II) a propylene/1-butene random copolymer layer laminated on at least one surface of the crystalline propylene layer (I); said propylene/1-butene random copolymer layer (II) consisting of a propylene/1-butene random copolymer, and optionally, one or more additives selected from the group consisting of heat stabilizers, ultraviolet light absorbers, anti-blocking agents, slip agents and antistatic agents; said propylene/1-butene random copolymer having the following properties: (1) the copolymer contains 60 to 85% by mol of constituent units derived from propylene and 40 to 15% by mol of constituent units derived from 1-butene, (2) the intrinsic viscosity, as measured in decahydronaphthalene at 135° C., is in the range of 1 to 5 dl/g, (3) the molecular weight distribution, Mw/Mn, as determined by gel permeation chromatography, is not more than 3, and (4) a parameter B value, which indicates the randomness of the copolymer, is in the range of 1.0 to 1.5, wherein B=P12/(2P1·P2) whereP1 is a first monomer content fraction, P2 is a second monomer content fraction, and P12 is a proportion of the first monomer—second monomer sequences to the total diad sequences.
Priority Claims (2)
Number |
Date |
Country |
Kind |
7-43284 |
Mar 1995 |
JP |
|
7-43285 |
Mar 1995 |
JP |
|
CROSS REFERENCE TO RELATED APPLICATION
This application is a Serial No. 08/609,997, filed Feb. 29, 1996 now abandoned, which in turn claims priority from Japanese Patent Application 43284/1995, filed Mar. 2 1995, and Japanese Patent Application 43285/1995, filed Mar. 2, 1995.
US Referenced Citations (19)
Foreign Referenced Citations (11)
Number |
Date |
Country |
0146968 |
Jul 1985 |
EP |
0320762 |
Jun 1989 |
EP |
0426638 |
May 1991 |
EP |
0427697 |
May 1991 |
EP |
0659552 |
Jun 1995 |
EP |
0668157 |
Aug 1995 |
EP |
49-14343 |
Apr 1974 |
JP |
53-114887 |
Oct 1978 |
JP |
61-25546 |
Jun 1986 |
JP |
WO 88-05792 |
Aug 1988 |
WO |
WO 88-05793 |
Aug 1988 |
WO |
Non-Patent Literature Citations (4)
Entry |
Coleman, et al., “General Theory of Stationary Random Sequences . . . ”, J. Poly. Sci.: Part A, Vol, 1, pp. 3183-3197 (1963). |
Carman, et al., “Monomer Sequence Distribution In Ethylene Propylene . . . ”, Rubber Chemistry and Technology, pp. 781-804. |
Wild, et al., “ansa-Metallocene Derivatives VII. Synthesis and Crystal . . . ”, J. Organometallic Chem. , pp. 63-67 (1985). |
Tsutsui, et al., “Propylene homo—and copolymerization with ethylene . . . ”, Polymer, vol. 30, pp. 1350-1356 (Jul. 1989). |
Continuations (1)
|
Number |
Date |
Country |
Parent |
08/609997 |
Feb 1996 |
US |
Child |
10/147088 |
|
US |