JPS58157840A - Molded article of propylene polymer composition by injection - Google Patents

Abstract

PURPOSE:A molded article of propylene polymer by injection having highly improved transparency, obtained by blending a propylene polymer with a specific di-substituted benzylidene sorbitol and a specified compound. CONSTITUTION:(A) 100pts.wt. propylene polymer having 0.1-100g/10min melt flow rate is blended with (B) 0.01-0.5pt.wt. di-substituted benzylidene sorbitol shown by the formula I(R is 1-8C alkyl, 1-8C alkoxy, or halogen; m and n are 0-3, and m+n>=1) and (C) 0.01-1pt.wt. at least one compound selected from a metal salt of hydroxystearic acid, a metal salt of stearyllacate 8-30C alkyl alcohol, and alkylamine shown by the formula II (R1 is 8-30C alkyl; k and l are 0-10 and k+l>=1) to give a composition, which is pelletized, molded by injection molding, etc. to give the desired molded article.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to highly transparent propylene polymer composition injection molded articles.

Intact polypropylene is easily used in a wide range of fields due to its excellent practical performance, but because it is crystalline, its transparency may be poor and the commercial price #i may be completely lost.

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 phosphorus metal salts, and condensates of polyhydric alcohols and aldehydes.

4! Although 1,3,2,4-dibenzylidene sorbitol is relatively effective, it has not yet reached a level that satisfies recent advanced demands.

In addition to 1,3,2,4-dibenzylidene sorbitol, di-substituted penzylidene rubitol is a nucleating agent that has a large effect on improving transparency (Japanese Patent Publication No. 55-1246
0% Japanese Patent Publication No. 56-30449, No. 56-30450. (Refer to Publications No. 56-45934), these 4 are expensive, and if used in large quantities, the problem of bleeding will occur, so
Establishing a technology that improves transparency by adding as little amount as possible is an essential issue.

The present invention is aimed at providing a solution to this problem, and the transparency is surprisingly highly improved by combining a specific compound with a specific di-substituted benzylidene sorbitol in a propylene polymer. This invention was made based on the discovery that an injection molded product can be obtained.That is, the present invention is an injection molded product made by blending the following (2) to 00.

100 parts by weight of a propylene polymer with a melt flow rate of 0.1 to 100 F/10 minutes (g) 0.01 to 0.5 parts by weight of 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 within the same compound. m and n are each independently an integer of ◎-3, and m+n≧1. ) 0.01 to 1% by weight of at least one compound selected from hydroxy-stearic acid metal salts, stearyl lactate metal salts, alkyl alcohols having 8 to 3 carbon atoms, and alkyl amines represented by the following formula (wherein, R1 is Alkyl group having 8 to 30 carbon atoms, k and t are each independently an integer of 0 to 1O, filtered, k+t≧1
It is. ) The propylene polymer which is the component (4) used in the present invention has a melt 70-ray) (MFR) of 0.1 to 100.
f/10 minutes, and the effects of the present invention are significantly exhibited in crystalline materials. Specifically, for example, in addition to a homopolymer of propylene, a majority (preferably 70% or more) of propylene and other a-olefins (
For example, ethylene, butene-1,4-methylpentene-1
, hexene-1, etc.) are suitable. A MFR of 4 other than the above is not preferable because it results in poor molding.

Moreover, the above-mentioned (silicon component) benzylidene sorbitol used in the present invention is a compound represented by the following formula.

In the formula f, 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 independent integers from KO to 3, and m+n≧1.) Specifically, R is alkyl such as methyl, ethyl, n-propyl, i-propyl, t-butyl, or methoxy; Alkoxy such as ethoxy and n-propoxy, or halogen such as chlorine and bromine are suitable.

Furthermore, examples of the hydroxy-stearic acid metal salt which is the above component 0 used in the present invention include lithium salt, sodium salt, potassium salt, calcium salt, magnesium salt, etc. of d,12-human tetraxystearic acid. Examples of the stearyl lactate metal salt include calcium stearyl lactate. In addition, examples of alkyl alcohols having a leg prime number of 8 to 30 include stearyl alcohol and lauryl alcohol.

Furthermore, as the alkylamine represented by the following formula, N,
N'-bis(2-hydroxyethyl)alkylamine (
Alkyl has 12 to 18 carbon atoms), N-(2
-hydroxyethyl)-stearylamine, etc.

(In the formula, & is an alkyl group having 8 to 30 carbon atoms, k and L
are each independently an integer of 0 to 10, and k+t≧1. ) The blending ratio of the above three components is 0.01 to 0.5 parts by weight, preferably 0.05 to 0.5 parts by weight, of component (2), di-substituted benzylidene sorbitol, per 100 parts by weight of the propylene polymer, component (4). 3 parts by weight and (0 component compound is 0.
01 to 1 part by weight, preferably 0.01 to 0.5 part by weight,
Particularly preferably, the above-mentioned hydroxy-stearate metal salt and stearyl lactate metal salt are 0.01 to 0.0.
3 parts by weight, and for the above-mentioned alkyl alcohols and alkyl amines, it is from O,OS to 0.5 parts by weight.

The @ component is expensive, and the more scenes there are, the more likely it is that bleeding will become a problem, so it should be used with fewer dragons as mentioned above.

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

In addition, if the C component exceeds the above amount, it will cause coloring or bleeding, and if it is less than the above amount, the effect will be too low. Other metal salts, ultraviolet absorbers, lubricants,
Antistatic agents, dispersants, coating materials, clarifying agents, gelling agents, molecular weight regulators, etc. can be added to the extent that they do not significantly impair the effects of the present invention.

The composition used in the present invention can be manufactured by a normal cross-mixing method. Additives such as additives are mixed in a mixer, etc., and then melted and kneaded in an extruder to form pellets. Using this pellet, a molded article is formed by injection molding. Of course, the powder mixed in the above mixer etc. may be directly subjected to molding. Also, 0 or It is better than the method of blending and molding.

Example (2) For 100 parts by weight of propylene-ethylene random copolymer (MFR 14t/1o min, ethylene content 2.5% by weight) as a component, as shown in Table 1, G-substitution as a component (to) benzylidene sorbitol and 0
The ingredients were blended together with an antioxidant, mixed in a super mixer, and pelletized in a 30-diameter extruder (230°C).

This pellet was molded into a 100×10 molding machine (280℃).
A sheet of 0XI was formed, and the transparency (haze) of this sheet was evaluated in accordance with JIS-6714.

The results are shown in Table 1.

The compounds with names in the table are as follows.

Gelol MD: 1,3,2,4-di(p-methylbenzylidene) sorbitol, manufactured by Shin Nihon Rika Co., Ltd.

LAA: ■ Calcium stearyl lactate manufactured by Musashino Chemical Research Institute.

Daiwax OHL: Lithium 12-hydroxy-stearate manufactured by Nitto Kasei ■.

C8-6: Calcium 12-hydroxystearate manufactured by Kosei #.

N, N'-screws (made by AMS310 Nilion ■)
2-hydroxyethyl)alkylamine.

However, alkyl has a carbon number of 12 to 18゜5t-OH:
Stearyl alcohol (reagent).

(Margin below)

Claims (1)

[Claims] An injection molded product of a propylene polymer composition characterized by blending the following components (A to 0) (4) Melt 70
- 100 parts by weight of a propylene polymer with a rate of 0.1 to 1°/1° (b) 0.01 to 0.5 parts by weight of 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 within the same compound. m and n are each independently an integer of θ to 3, and m≧1. ) (Q 0.01 to 1% by weight of at least one compound selected from hydroxy-stearate metal salt, stearyl lactate metal salt, alkyl alcohol having 8 to 30 carbon atoms, and alkylamine represented by the following formula (in the formula, is an alkyl group having 8 to 30 carbon atoms, k and t
are each independently an integer of θ to 10, and k+t≧1. )