Stretched polypropylene film

Details Stretched polypropylene film Stretched polypropylene film

1995-07-07

1996-09-17

Teskin, Fred

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525106, 525164, 525227, 525240, 524430, 524451, 524570, 524584, 526127, 526160, 526308, 5263481, 428516, 428523, 428910, C08L 4500, C08L 2310

Patent

active

055569200

ABSTRACT:
An at least monoaxially stretched polypropylene film made of a composition comprising a crystalline polypropylene and a monocyclic olefin polymer (e.g. a polycyclobutene or a polycyclopentene), wherein the content of the monocyclic olefin polymer is 0.1-1,000 ppm by weight.
The polypropylene film is superior not only in transparency but also in image clarity by which an image is clearly seen through the film.
The polypropylene film, when further comprising talc having an average particle diameter of 0.1-10 .mu.m in an amount of 50-4,000 ppm by weight, can prevent the surface roughening or edge roughening of sheet during the sheet formation conducted before stretched film production.
The polypropylene film, when further comprising an anti-blocking agent and a polyethylene together, can prevent the generation of voids caused by the anti-blocking agent.

REFERENCES:
patent: 4603174 (1986-07-01), Okada et al.
patent: 5141994 (1992-08-01), Kakugo et al.
patent: 5362782 (1994-11-01), McCullough, Jr. et al.
"Influence of Nucleating Agents on Crystallization of Polypropylene", J. Thermal Analy., 28, 161 (1983).
"DTA Study of Heterogeneous Nucleation of Crystallization in Polypropylene", J. Appl, Polym. Sci., 9, 2131 (1965).
"Correlation between .sup.13 C NMR ChemicalShifts and Conformation Polymers 3. Hexad Sequence Assignments of Methylene Spectra of Polproplyene", Zambelli et al. in Macromolecules, 13, 267 (1980).
"The Microstructure of Poly(cyclopentene) Produced by Polymerization of Cyclopentene with Homogeneous Ziegler-Natta Catalysts", S. Collins and W. Mark Kelly, Macromolecules, 25, 233 (1992).
"Crystal Structure of Isotactic Polypropylene", Journal of Macromolecular Science, Physics B6, 101 (1972).
Patent Abstracts of Japan, unexamined applications, C field, vol. 18, No. 32, Jan. 18, 1994, The Patent Office Japanese Government, p. 152 C 1154.

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