JPS58129036A - Propylene polymer composition - Google Patents

Abstract

PURPOSE:To prepare the titled composition having remarkably improved transparency, by adding a specific disubstituted benzylidene sorbitol in combination with a I-group metal salt of an aliphatic organic acid to a propylene polymer. CONSTITUTION:The objective composition is prepared by compounding (A) 100pts.wt. of a propylene polymer having a melt flow rate of 0.1-100g/10min with (B) 0.01-0.5pt.wt. of the compound of formula (R is 1-8C alkyl, 1-8C alkoxy or halogen, m and n are 0-3 and m+n>=1), e.g. 1,3,2,4-di(p-methylbenzylidene)sorbitol and (C) 0.001-0.3pt.wt. of a I-group metal salt of a 8-30C aliphatic organic acid. The effect is remarkable in crystalline propylene copolymers.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to highly transparent improved propene polymer compositions.

Since it is crystalline, transparency may be poor and the commercial value may be impaired.

In order to improve this drawback, conventional methods of adding various nucleating agents to papermaking have been attempted. Known examples of nucleating agents include aluminum salts of aromatic carboxylic acids, aromatic carboxylic acids, aromatic metal phosphates, and condensates of polyhydric alcohols and aldehydes.

In particular, 1,3,2,4-dibenzylidene sorbitol is relatively effective, but has not yet reached a level that satisfies recent advanced demands.

Besides, 1,3,2,4-dibenzylidene sorbitol and di-substituted benzylidene sorbitol are nucleating agents that have a large effect on improving transparency (% Kosho 55-1246).
0, JP-A-56-30449, JP-A-56-30450. (Refer to Publications No. 56-45934), this product is expensive, and if used in large quantities, it will cause problems with bleeding.
Establishment of a technology that improves transparency with as little addition as possible is a necessary issue.The present invention aims to provide a solution to this issue. This method was developed based on the discovery that by blending benzylidene sorbitol with a specific fatty acid metal salt, a composition with significantly improved transparency than the original method could be obtained.

That is, the present invention is a propylene polymer composition characterized by blending the following components (1) to (5).

(4) Melt flow rate is 0.1 to 100f710
100 parts by weight of propylene polymer (6) 0.01 to 0.5 parts by weight of a compound represented by the following formula (
(Left space below) (In the formula, R is either alkyl having 1 to 8 carbon atoms, alkoxy or /.rogen, even if they are different in the same compound. m and n are independent integers of VC0 to 3. and m+n≧1.) 0 0.001 to 0.3 parts by weight of a metal salt of Group 1 of the Periodic Table of an aliphatic organic acid having 8 to 30 carbon atoms The composition of the present invention has highly improved transparency. The propylene polymer which is the above-mentioned prison component used in the present invention is
Melt flow rate (MFR) is 0.1 to 100f/1
The effect of the present invention is significantly exhibited in crystalline materials. Specifically, for example, in addition to a homopolymer of propylene, a majority (preferably 700 parts by weight or more) of propylene and other a-olefins (e.g., ethylene, butene-1,4-methylpentene-1, hexene-1 etc.) are suitable. If the MFR is other than the above, it will result in poor molding and is not preferred.

Moreover, the di-substituted benzylidene sorbitol, which is the above-mentioned component used in the present invention, is a compound represented by the following formula.

(In the formula, R is either alkyl having 1 to 8 carbon atoms, alkoxy or halogen, and may be different in the same compound. m and n are each independently an integer of KO to 3, and m 10n≧1) Specifically, R is methyl, ethyl, n-propyl, t-propyl, t-7
Suitable are alkyl such as ``chile'' or alkoxy such as methoxy, ethoxy, n-propoxy, or I-groups such as chlorine and bromine.Furthermore, the fatty acid metal salt as the Ω component used in the present invention has a carbon number It is a metal salt of group 1 of the periodic table of aliphatic organic acids having numbers 8 to 30.

Specifically, the combination of the above three ingredients includes fatty acids such as lauric acid, myristic acid, (lumitic acid, stearic acid, behenic acid, oleic acid, and acontanoic acid) and metal salts such as lithium, sodium, and potassium. The ratio is 5% of the propylene polymer as the prisoner component.
oo7jr, Okibe, component (6) G-purchased penzylidene rubitol is 0. 1 to 0.5 parts by weight of O, preferably 0.05 to 0.3 parts by weight, and 0.001 to 0.3 parts by weight of fatty acid metal salt of component 0, preferably o, o
o s ~ 0.2 parts by weight.

(2) Ingredients are expensive, and the larger the amount, the greater the possibility of bleed becoming a problem, so it should be used in small amounts as mentioned above.

However, if the amount is less than the above, the effect will be unsatisfactory.

Moreover, if the amount of the mouth component exceeds the above amount, it may cause coloring, and if the amount is less than the above amount, the effect will be too low.

Other components of the composition of the present invention include commonly used antioxidants, metal salts other than the above ingredients, ultraviolet absorbers, lubricants, antistatic agents, dispersants, pigments, clarifying agents, and gelling agents. ,
Molecular weight regulators and the like can be added within a range that does not significantly impair the effects of the present invention.

The composition of the present invention can be manufactured by a conventional cross-wire method.

That is, for example, the proprene polymer powder of component (2) is blended with component (2), component (2), and other additives such as antioxidants if necessary, mixed with a mixer, etc., and then melt-kneaded with an extruder. Make pellets. The pellets are molded into films, blow containers, or molded products by molding methods such as injection and extrusion. Of course, the powder mixed with the above mixer etc. may be directly molded.

It is also possible to use a method in which only the above @ or 0 component is blended with component (2) to form a pellet, and the or (or) component is attached or added to the composition and subjected to molding.

Examples Propylene-ethylene random copolymer (MFRl 4
f710 minutes, ethylene content 2.5% by weight), di-substituted benzylidene sorbitol and fatty acid metal salts were blended with an antioxidant as shown in Table 1, mixed in a super mixer, and then extruded with a diameter of 30 mm. Machine (23
pelleted at 0°C). This pellet is put into an injection molding machine (
The sheet was molded into a 100×100×1 sheet at 280° C.), and the transparency (haze) of this sheet was evaluated in accordance with JIs-6714. Results 1st and 21st! Shown below.

The compounds with the names in the table are as follows: 9 ◎Gelol MD: 1,3.2.4-di(p-methylbenzylidene)sorbitol 13u-D B S manufactured by Shin Nihon Rika Co., Ltd.
: Prototype, 1.3,2.4-di(p-n-butylbenzylidene) sorbitol α-DBS : Prototype, 1,3,2.4-di(p-chlorobenzylidene) sorbitol ECI: EC Chemical Co., Ltd. 1.3,2.4-di(benzylidene)sorbitol TPNC: manufactured by ICI, 1.1.3-tris(2-methyl-4-hydroxy-5-t-butyl-7enyl)butane RA 1010 : Manufactured by Ciba Geigy, Tetrakis (methylene-3-(3,5-di-t-butyl-4-hydroxyphenyl)globionate) methane DMTP : Manufactured by Yoshitomi Pharmaceutical Co., Ltd., Similystylthiodipropionate BHT : Manufactured by the same company, 2 .6-di-t-butyl-p-cresol W8618: manufactured by BorgWarner, distearyl pentaerythritol-diphosphite MK329: MARK329, manufactured by Adeka Argus, tris-(mono-nonylphenyl) phosphite and tris-( Mixture with di-nonylphenyl) phosphite

Claims (1)

[Scope of Claims] A propylene polymer composition characterized by containing the following (A-0 component). (4) A melt flow rate of 0.1 to 100 f71
100 parts by weight of propylene polymer with 0 min.
In the formula, R is either alkyl having 1 to 8 carbon atoms, alkoxy or halogen, and may be different in the same compound. m and n are each independently an integer of 0 to 3, and m+n≧1. ) 0 0.001 to 0.3 parts by weight of metal salts of group Ⅰ of the periodic table of aliphatic organic acids having 8 to 30 carbon atoms