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| I claim: 1. A polymer blend comprising a linear low density copolymer of ethylene with an olefin ... |
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| Impact copolymer compositions |
| What is claimed is: 1. A polypropylene impact copolymer composition consisting essentially of a ... |
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| Molding composition |
| OF THE INVENTION The molding composition of the present invention employs mixtures of several ... |
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| Asbestos-free friction material |
| What we claim is: 1. An asbestos-free friction material comprising 5 to 25% by weight of a ... |
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| Composition comprising a metal salt and metal powder therefrom by the calcining thereof |
| OF THE INVENTION Disclosed herein is a composition that is non-fluid substance of an essentially ... |
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| Process for the production of modified polyolefin |
| OF THE INVENTION A feature of the present invention is that the organosilane compound added to ... |
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| Reinforced cement sheet product containing fibers other than asbestos, clay and thickener |
| What is claimed is: 1. A fiber-cement product comprising by weight Portland cement in an amount of ... |
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| Reinforcing element and method of making the same |
| 1. A reinforcing element comprising a bundle of from about 15 to about 100 strands of reinforcing ... |
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| 5-Aralkyl substituted 2h-benzotriazoles in stabilized compositions |
| What is claimed is: 1. A stabilized composition which comprises (a) an organic polymer substrate ... |
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Process for the production of a biaxially highly oriented polypropylene film
| Details |
Inventors: Peiffer, Herbert; Murschall, Ursula; Busch, Detlef; Lohmann, Harald;
Assignee: Hoechst AG (DE)
Primary Examiner: Thurlow; Jeffery R.
Assistant Examiner:
Attorney, Agent or Firm: Connolly & Hutz
A process for the production of a biaxially oriented propylene polymer film contains, in its single ply (or, if it is a multi-ply film, in its base ply) a low molecular weight resin, and the film has improved stretchability and other desirable physical properties, even though the propylene polymer of the sole or base ply is preferably a homopolymer. The n-heptane-insoluble fraction of the film has a chain isotacticity index, measured by means of .sup.13 C-NMR spectroscopy, of at least 85 to 94%. The sole or base ply contains less than 10% by weight of resin. The film is stretched in such a way that the product of tensile strength in the longitudinal and transverse direction is greater than 50,000 (N/mm.sup.2).sup.2. The film is made by, among other steps, carrying out the orientation in the longitudinal and transverse directions such that the product of the longitudinal stretching ratio and the transverse stretching ratio is.gtoreq.60. |
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DETAILED DESCRIPTION The propylene polymer of the base ply (or single ply, if there are no top plies) is preferably essentially a homopolymer; that is, there are preferably essentially no other repeating units, since minor amounts of ethylene units (e.
g.
0.
1 or 0.
15 to 2 mol-%) or the like are not required in this base or single ply.
The film having the homopolymeric ply still has good stretchability and excellent physical properties.
Properties of the aforementioned propylene homopolymer include a melting point of 140.
degree.
to 165.
degree.
C.
, preferably 155.
degree.
to 162.
degree.
C.
, and a melt flow index (measured according to DIN 53 735 under a load of 21.
6N and at 230.
degree.
C.
) of 1.
0 to 10 g/10 min, preferably 1.
5 to 6 g/10 min.
The n-heptane-soluble fraction of the propylene polymer is in general 1 to 10% by weight, based on the starting polymer.
The n-heptane-insoluble fraction of the propylene homopolymer is isotactic.
The chain isotacticity index of the n-heptane-insoluble fraction of the homopolymer, determined by means of .
sup.
13 C-NMR spectroscopy, is 85 to 94%, preferably 90 to 93%.
The molecular weight distribution of the propylene homopolymer can vary within wide limits, depending on the field of use.
The ratio of the weight average molecular weight M.
sub.
w to the number average molecular weight M.
sub.
n, is in general between 2 and 15.
In a preferred embodiment of the film according to the invention, the ratio of the weight average molecular weight M.
sub.
w to the number average molecular weight M.
sub.
n is 2 to 6, very particularly preferably 3.
5 to 5.
Such a narrow molecular weight distribution of the propylene polymer of the base ply is achieved, for example, by peroxidic degradation thereof.
A measure of the degree of degradation of the polymer is the so-called degradation factor A, which indicates the relative change in the melt flow index according to DIN 53 735 of the polypropylene, relative to the starting polymer.
##EQU1## MFI.
sub.
1 =Melt flow index of the propylene polymer before the addition of the organic peroxide MFI
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