JPS5874737A - Ethylene copolymer resin composition - Google Patents

Abstract

PURPOSE:To provide a resin compsn. having a greatly improved workability, by adding a combination of minute amts. of dibenzylidenesorbitols and a specific phenol compd. to a straight-chain low-density polyethylene resin. CONSTITUTION:To 100pts.wt. straight-chain low-density polyethylene resin are added (A) 0.001-3pts.wt. stearyl 3, 5-ditert-butyl-4-hydroxyphenylpropionate or pentaerithritol tetra-(3,5-di-tert-butyl-4-hydroxyphenylpropionate), and (B) 0.001-3pts.wt. sorbitol deriv. of the formula (wherein R is H, alkyl, hydroxy, alkoxy, halogen) [e.g., dibenzylidenesorbitol, bis-(p-tert-butylbenzylidene)sorbitol], yielding a polyethylene resin compsn. The combination of compds. A and B permits the workability to be improved greatly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to ethylene copolymer resin compositions. Specifically, the present invention relates to a linear low-density polyethylene resin composition with improved processability.

Linear low-4 degree polyethylene has, for example, a lower elongation rate during tensile strength, lower impact resistance, less environmental stress cracking, and a heat resistance of 10 to 100% compared to ordinary low-density polyethylene produced by the pressure method. 20℃ higher, high rigidity, less warping, film strength (10~20℃ thinner), excellent heat seal strength, oil resistance, cold resistance, acid resistance, alkali resistance, etc. It has the following characteristics.

However, linear low-density polyethylene has the disadvantage of a low extrusion rate due to its high melt viscosity and melt fracture, which poses problems in its processability.

It is known that dibenzylidene sorbitol is added to improve the mechanical strength of polyethylene.

However, as mentioned above, linear low-density polyethylene has greater strength than ordinary high-pressure low-density polyethylene, for example, it has 5 to 4 times the tear strength, so The need to improve strength is small;
There is a strong desire to improve processability, which is the biggest problem. In addition, even if dibenzylidene sorbitol is added to linear low-density polyethylene alone or in combination with a phenol compound such as 2,6-di-tert-butyl-P-cresol, there is no improvement in processability. small,
The arrangement is not satisfactory.

The inventor of the present invention has conducted extensive studies to improve the processability of linear low-density polyethylene, and as a result, has decided to add dibenzylidene sorbitol and a specific phenol compound in combination.
It was discovered that the processability of the product was significantly improved, and the present invention K
11. That is, the present invention provides linear low-density polyethylene resin 1◎O parts by weight, (IL) stearyl-B, 5-di-5th phthyl-4-hydroxyphenylpropionate or pentaerythritol tetra(S, 5- 4-Hydroxyphenylpropione) ) o,
Provided is a linear low-density polyethylene resin composition having good processability, consisting of 0.001 to 5 parts by weight and (1) 0.001 to 1 part by weight of four sorbitol trout represented by the following general formula (RI): It is something to do.

naoom OH, On (wherein, R is a hydrogen atom 1. an alkyl group, a hydroxy group,
Indicates an alkoxy group or a halogen atom. ) The composition of the present invention having the above characteristics will be described in detail below.

The linear low-density polyethylene used in the present invention is a low-density polyethylene produced using a medium-low pressure process, and has virtually no long chain branching, but the degree of short chain branching generated from the comonomer is Although it is tall and linear, it has a large amount of branching. It is a copolymer with one or more α-olefins of 03 to 0-. These a-olefins are propylene, 1-butene, 1-pentene, 1,4-methylpentene-1, heptene-1, and 1-octene. Also, it has an In value of 0.10 to 0.94, and contains stearyl 5.5-di-butyl-4- and diphenylpropionate or pentaerythritol tetate in the liquid. The amount of (B, 5-5-di-5-butyl-4- and doro-imacyphaelglobionate) added is 0.001 to 5 parts by weight, preferably 0.01 to 5 parts by weight, per 100 parts by weight of the resin.
It is 1 part by weight.

In the sorbitol derivative represented by general formula (1)!
Examples of the alkyl group represented by include groups such as methyl, ethyl, propyl, butyl, hexyl, and octyl.

Further, examples of the alkoxy group include groups such as methoxy, ethoxy, and butoxy.

Examples of the halogen atom include chlorine, iodine, and bromine atoms.

Therefore, the general formula [! ] Examples of specific compounds include dibenzylidene sorbitol, bis(o-, m-[
9 is p-methylbenzylidene) sorbitol, bis(p
-5th butylbenzylidene) sorbitol, bis(0
-, In-1& is p-chlorobenzylidene) sorbitol, bis(o-, t]9 is p-brombenzylidene) sorbitol, bis(0-, m- or p-hydroxybenzylidene) sorbitol, bis(0-, ] Tah p-
Examples include methoxybenzylidene) sorbitol. The amount of the sorbitol derivative added is 0.001 to B parts by weight, preferably 0.0 parts by weight, per 100 parts by weight of the resin.
1~! ! Parts by weight.

Examples will be shown next, but the present invention is not limited to these K.

Example 1 Using the following formulation, 1
The average amount of extrusion per minute (the average torque (′
Measure I4. First, observe the presence or absence of a lute fracture. A composition with a large value of um/B and no melt fracture has good processability.

The results are shown in Table 1 below.0 Compounded dibenzylidene sorbitol 0. s Phenol Compound 0.1 Example 2 A test similar to Example 1 was conducted using the following formulation.

The results are shown in Table-2.

Blended Dibenzylidene Sorbitol 0.5 Phenoxynol Compound 0.2 Example 3 The same test as in Example 1 was conducted using the following formulation.

The results are shown in Table-3.

combination

Claims (1)

[Claims] Straight chain low! 100 parts by weight of 1 degree polyethylene resin, (IL
) stearyl-s, s-di-5-butyl-4-hydroxy-7-erglobionate or pentaerythritol.
Tetra(S,S-di-tert-butyl-4-hydro-diphenylprobionate) 0.001 to S parts by weight and (→ 0.0G1 of sorbyl derivative represented by the following general formula
A polyethylene resin composition O01111011 with good processability consisting of parts by weight of S (wherein, R represents a hydrogen atom, an alkyl group, a hydroxy group, an alkoxy group, or a halogen atom).