KR20040084065A - Resin composition with ultraviolet filtering function for extrusion coating and lamination - Google Patents

Abstract

PURPOSE: Provided is a resin composition for extrusion coating and lamination which has substantially excellent ultraviolet blocking effect. CONSTITUTION: The resin composition for extrusion coating and lamination comprises 99.9 wt% to 80 wt% of ethylene vinyl acetate resin or low density polyethylene resin and 0.1 wt% to 20 wt% of an ultraviolet block agent having azo group and benzene group. Particularly, the ethylene vinyl acetate resin has a vinyl acetate content of 2-50 wt% and a melt index of 0.1-100g/10min and the low density polyethylene resin has a melt index of 0.1-100g/10min.

Description

Resin composition with ultraviolet filtering function for extrusion coating and lamination}

TECHNICAL FIELD The present invention relates to a resin composition for extrusion coating and extrusion lamination having UV protection, and more particularly, to azo groups in ethylene vinyl acetate (hereinafter referred to as EVA) resin or low density polyethylene (hereinafter referred to as LDPE) resin. A resin composition including a sunscreen agent comprising a benzene group, wherein the EVA resin is a vinyl acetate content of 2 to 50% by weight, a melt index of 0.1 to 100g / 10 minutes, the LDPE resin is a melt index of 0.1 to 100g / 10 minutes It relates to a sunscreen extrusion coating and a resin composition for extrusion lamination, characterized in that.

In general, the EVA resin or LDPE resin is added with an ultraviolet stabilizer to prevent degradation by ultraviolet rays, which trap the radicals generated by the ultraviolet rays to prevent the progress of the degradation reaction to improve the stability of the resin to the ultraviolet rays, These UV stabilizers do not fundamentally block UV rays.

Therefore, there is a need in the art for the development of EVA or LDPE resin composition to solve the above UV protection problem.

The present inventors have diligently researched to solve the above problems, and when extruded EVA resin or LDPE resin, the inventors confirmed that a very good and fundamental sunscreen effect can be obtained by directly mixing the sunscreen agent having azo and benzene groups in the melt. The present invention has been reached.

That is, an object of the present invention is to provide an EVA and / or LDPE resin composition having an excellent ultraviolet blocking effect.

One aspect of the present invention for the above object is that azo groups in an LD resin resin mixture having a vinyl acetate content of 2 to 50% by weight, a melt index of 0.1 to 100 g / 10 minutes or a melt index of 0.1 to 100 g / 10 minutes. It relates to a resin composition for extrusion coating or lamination having a sunscreen prepared by mixing a sunscreen having a benzene group.

Hereinafter, the present invention will be described in more detail.

The UV-blocking extrusion coating and the lamination resin of the present invention include an EVA resin having a content of 2 to 50% by weight of vinyl acetate, a melt index of 0.1 to 100 g / 10 minutes, and an LDPE resin having a melt index of 0.1 to 100 g / 10 minutes. It is characterized by mixing the sunscreen having azo and benzene groups in the mixture.

At this time, the composition ratio between the components is 99.9 to 70% by weight of the EVA resin or LDPE resin and 0.1 to 30% by weight of the sunscreen based on the weight of the final resin composition.

The sunscreens usable in the present invention include all known sunscreens, and more preferably include sunscreens having azo and benzene groups.

Resin prepared as described above shows a very excellent UV blocking effect, compared to EVA resin or LDPE resin.

EXAMPLE

Hereinafter, the structure and effect of the present invention will be described in more detail with specific examples and comparative examples, but these examples are only intended to more clearly understand the present invention, and are not intended to limit the scope of the present invention.

Examples 1-12

The EVA resin or LDPE resin and the sunscreen were mixed in the composition of Table 1 below and then melt mixed using a single extruder. The resin composition was put back into the extrusion coating machine and the UV protection effect was compared by molding the coating film after JIS A 5759. The results are shown in Table 1 below.

Comparative Example 1

Except for using only ethylene vinyl acetate resin having a melt index of 10 and a vinyl acetate content of 15%, after forming a coating film in the same manner as in Example 1, the volume resistivity was compared. The results are shown in Table 1.

Comparative Example 2

The volume resistivity was compared after forming a coating film in the same manner as in Example 1 except that only a low density polyethylene resin having a melt index of 10 was used. The results are shown in Table 1.

The properties of the resin compositions of Comparative Examples and Examples are also shown in Table 1.

As can be seen from Table 1, the UV protection of the resin composition for extrusion coating and lamination produced by mixing the sunscreen is superior to the EVA or LDPE single resin.

As described above in detail, the extrusion coating resin and the lamination resin of the present invention exhibit much better UV protection than the EVA resin alone or the LDPE resin alone.

Claims (2)

A vinyl acetate content of 2 to 50% by weight, an EVA resin having a melt index of 0.1 to 100 g / 10 minutes, or an LDPE resin having a melt index of 0.1 to 100 g / 10 minutes, and a sunscreen including azo and benzene groups. Extrusion coating or lamination resin composition. The resin composition according to claim 1, wherein the composition of the resin composition is 99.9 to 80% by weight of EVA resin or LDPE resin, and 0.1 to 20% by weight of sunscreen.