Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1994-09-07
1999-06-29
Smith, Edward J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
502111, 502127, 524583, 524584, 526119, 5261253, 5261256, 526904, C08F 1006, C08F 4651, C08F 4654
Patent
active
059169907
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a propylene-based polymer with excellent physical properties such as rigidity, surface hardness, heat resistance, water vapor barrier property, etc. which is suitable for use in automobiles, consumer electric goods and packaging materials, to a method for the production thereof, to a composition containing it and to a catalyst component for its polymerization and a method for its production.
BACKGROUND ART
Propylene-based polymers are generally inexpensive, and exhibit characteristic properties including transparency, mechanical strength, heat resistance, surface gloss, chemical resistance, oil resistance, rigidity, flex clacking resistance, etc., for which they thus have a wide range of uses as industrial materials, food packaging materials, cosmetic packaging materials, drug packaging materials, and the like.
As mentioned above, propylene-based polymers exhibit characteristics such as rigidity, impact resistance, etc., and are thus widely used in various production industries including automobiles, consumer electric goods, miscellaneous goods, and the like. Recently, producers are investigating the prospect of making products thinner in order to render them more light-weight and lower their cost, while increasing the surface strength in order to prevent damage to the surface thereof. That is, demand is increasing for propylene-based polymers which have high rigidity, high surface hardness and excellent impact resistance. Also, demand has continued to increase for a higher level of physical properties and workability, and particularly desired are the maintaining of the rigidity and strength at high temperatures, durability, and the improvement of the moldability of large-size moldings.
Regarding high rigidity and improved transparency and surface gloss of propylene-based polymers, there have been conventionally known methods which employ fillers such as I.sub.a and II.sub.a group metal salts of monocarboxylic acids (for example, sodium benzoate), III-IV group metal salts of dicarboxylic acids (for example, adipic acid) and aliphatic dicarboxylic acids (for example, aluminum adipate), dibenzylidene sorbitol derivatives, talc and the like, as nucleating agents (Japanese Examined Patent Publication (KOKOKU) No. 39-1809, Japanese Unexamined Patent Publication (KOKAI) No. 60-139731, etc.), and methods which create a wide distribution of the molecular weight of propylene-based polymers (Japanese Unexamined Patent Publication (KOKAI) Nos. 56-2307, 59-172507, and 62-195007, etc.).
However, although use of these nucleating agents results in improvement in the aforementioned physical properties, it cannot be said that they are necessarily sufficient for all uses.
Consequently, it has been desired to obtain propylene-based polymers suitable as materials for automobiles, consumer electric goods and packaging materials, which have excellent mechanical strength including impact resistance, rigidity, etc. as well as surface hardness and heat resistance, at the same time lowering the density of the products to render them more thin by reducing the amount of fillers such as talc and the like.
Furthermore, efforts are continuing to improve the stereoregularity (isotacticity) of propylene-based polymers, widen their molecular weight distribution, increase their strength and durability which depend on the molecular weight distribution, and improve the moldability in extrusion molding, blow molding and the like.
Of these efforts, the development particularly of catalysts with high activity and producing high isotacticity are recently being ardently studied. All are catalyst systems comprising a solid catalyst component containing magnesium, titanium, a halogen and an electron-donating compound as essential components, with an organoaluminum and another electron-donating compound, and examples thereof are disclosed in Japanese Unexamined Patent Publication (KOKAI) Nos. 57-63310, 58-32604, 58-83006, 59-206408, 59-219311, 60-130607, 61-209207, 61-211309, 62-72702, 62-10
REFERENCES:
patent: 4442276 (1984-04-01), Kashiwa et al.
patent: 4560734 (1985-12-01), Fujishita et al.
patent: 4914069 (1990-04-01), Job et al.
patent: 4952649 (1990-08-01), Kioka et al.
patent: 5023223 (1991-06-01), Ebara et al.
patent: 5239022 (1993-08-01), Winter et al.
patent: 5244989 (1993-09-01), Hara et al.
patent: 5349032 (1994-09-01), Miyake et al.
patent: 5354820 (1994-10-01), Funabashi
patent: 5385993 (1995-01-01), Fujita
Database WPI, Section Ch, Week 8251, Derwent Publications Ltd., London, GB; Class A17, AN 82-09857J XP002010643 & JP-A-57 103 819 (Mitsubishi Petroch KK) Jun. 28, 1982 *abstract*.
Itoh Kazuharu
Iwamoto Satoshi
Takahashi Hirotoshi
Watanabe Kazuyuki
Yanagihara Hisayoshi
Showa Denko K.K.
Smith Edward J.
LandOfFree
Propylene-based polymer, method of its production, composition t does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Propylene-based polymer, method of its production, composition t, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Propylene-based polymer, method of its production, composition t will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1376143