JPH0195042A - Laminate molding - Google Patents

Abstract

PURPOSE:To produce a molding, especially a cosmetic container having a soft and warm feel and excellent shock-proofness by providing an elastomer wherein point measured by JIS K-6301A is at most 90 as the surface layer and a resin wherein R-scale measured by JIS K-7202 is at least 75 as the inside layer. CONSTITUTION:A surface layer 8 is prepared of an elastomer wherein its point measured by JIS K6301A is at most 90, preferably 60, more preferably 40-20, on inside layer 4 is prepared of a resin wherein R-scale measured by JIS K7202 is at least 75, preferably 80-90, more preferably 80-85. The thickness of the surface layer is normally 6mm-0.5mm, preferably 3-1mm, although it becomes more effective, even thin, as the valve of the elastomer measured by JIS K6301A becomes smaller. As the resin for forming the inside layer, polypropylene, polyethylene, polyester etc. are optionally used.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a laminate molded product having an elastomer layer on its surface, particularly a laminate container.

[Prior art]

BACKGROUND ART Conventionally, containers for cosmetics have been required to be soft, give a warm feel, and have impact resistance.

Recently, the points measured by JIS-6301A are 20~
Although extremely soft and elastic elastomers such as No. 40 have been developed, even if they were molded from raw materials, they could not meet the requirements originally required for containers.

〔the purpose〕

The present invention uses an elastomer with a specific softness as a surface layer and a synthetic resin with a specific hardness as an inner layer.
The object of the present invention is to provide a molded article, particularly a container for cosmetics, which has the soft and warm feel that has been desired in the past and has excellent impact resistance.

[Structure of the invention]

The present invention provides (1) a surface layer made of an elastomer with points measured according to JIS K6301A of 90 or less, preferably 60 or less, particularly preferably 40 to 20;
The inner layer is made of a resin having an R-scale of 75 or more, preferably 80 to 95, particularly preferably 80 to 85, as measured by SK7202.

The elastomer for the surface layer is not particularly limited as long as it has the above-mentioned specific softness. Specifically, styrene elastomer, polyamide nystomer, polyester elastomer, etc. can be used.

A styrene elastomer is a didistomer composed of a polystyrene domain and a rubber matrix, and includes block copolymers composed of styrene blocks and elastomer blocks, particularly styrene-ethylene/butylene-styrene block copolymers.

Polyamide-based elastomers include polyether amide type and polyester amide type, and ether or ester blocks constitute the soft segment.

A polyester elastomer is a block copolymer consisting of an ester block and an earth-chill block, and the ether block constitutes a soft segment.

As for the thickness of the surface layer, the smaller the JIS K6301A value of the elastomer, the more effective it will be, but it is usually 6 to 0.
．． 5 ma+, preferably 3+ nm to 1 m gives good results. In particular, when the JIS K6301A value is 20 to 40, a thickness of about 1 m to 2 m is sufficient.

As the resin forming the inner layer, any resin such as polypropylene, polyethylene, polyester, etc. can be used.

The molded product of the present invention is usually made by injection molding a resin using a first injection molding machine, and then injection molding an elastomer thereon using a second injection molding machine to form a laminate molded product.

Usually, an elastomer paint is further applied on the molded body to create an aesthetic appearance.

(Example) Example 1 Polypropylene resin, Chisso Corporation K 4028 (JISK-7
Injection molded R-scale 95) of 202, thickness 2II
Core molded product 3 of I11 was obtained. Next, the core molded product is transferred to a second injection mold, and styrene-ethylene/
Butylene-styrene block copolymer [Aron Kasei Co., Ltd. Elastomer AR#730X (JIS K-6301
A(7) Point 30)] was injection molded to form an elastomer layer 8 on the surface of the core molded product 3 to a thickness of 2 mm.

The compact top cover formed in this way was coated with a primer for AR elastomer (FR-74) manufactured by Itaben Kagaku Kogyo Co., Ltd.
After painting 00), apply a hardening agent.
0.4 parts by weight thinner
3 parts by weight white pigment
0.6 parts by weight Pearl pigment 0
．． 3 parts by weight of top coat paint was applied and baked at 80°C for 30 minutes.

Example 2 A cream container having a threaded fitting part with a cap was made of the same polypropylene as in Example 1, and the first container shown in FIG.
The obtained core molded product 4 with a thickness of 3 mm was inserted into a second injection mold, and the same elastomer as in Example 1 was injection molded to form a surface layer of 3 mm.
A container for cream having an elastomer layer of A final coating was applied to this using the same paint as in Example 1.

Example 3 Mitsubishi Kasei Corporation polypropylene resin, Diapolymer #
6200E (JIS 7202/R-scale 80)
was injection molded to form a parison 4' with a thickness of 2.5 m.

Next, the parison 4 is transferred to a second injection molding machine, and the same elastomer as in Example 1 is injection molded to form a surface layer 8 having a thickness of 3n11. The laminated parison thus obtained was blow-molded using a blow-molding machine with a mold in which the inner surface of the cavity 9 was textured with leather scraps to form a lotion bottle with an inner layer of 1.8 nn and an outer layer of 2.1 m. I got it.

The molding machine used is SIB150/75 Nestal manufactured by Juumin Heavy Industries, Ltd.

The surface of this bottle was coated with the same primer as in Example 1, and then the same finishing coat was applied using the same paint except that the pigment in Example 1 was replaced with 0.6 parts by weight of black pigment.

〔effect〕

The surface of the molded product obtained in this way is soft and elastic and will dent when pressed with a fingernail, but will recover over time.
It has a warm feel, makes a soft sound when placed on a table, and has excellent impact resistance. or,
When the surface m is molded with a mold having a textured surface, it is possible to obtain a feeling as if the surface is covered with leather because of its softness.

[Brief explanation of the drawing]

FIG. 1A shows the first injection mold of Example 1, and FIG. 1B shows the second injection mold.
3 shows cross-sectional views of the injection molds. Figure 2A shows the first injection mold of Example 2, Figure 2B shows the second injection mold.
A cross-sectional view of each injection mold is shown. FIG. 3A shows the first injection mold of Example 3, and FIG. 3B shows the second injection mold.
These are respective cross-sectional views of the injection molds. This indicates that the injection molding of the parison has been completed. Figure 3C shows the parison being rotated and filled into the blow molding mold, and the third diagram shows the completed blow molding. 1... Cavity of the first injection mold 2... Core 3 of the first injection mold... Gate portion 4 of the first injection mold... Inner layer 5 of the molded product... Cavity 6 of the second injection mold...Core 7 of the second injection mold...Gate portion 8 of the second injection mold...Surface layer 9 of the molded product...Mold for blow molding Cavity 10... Core 11 of the blow molding mold... Air suction port 4'... Inner layer of the parison 8'... Outer layer of the parison Fig. 1 Fig. 3

Claims (1)

[Claims] 1. Points measured by JIS K-6301A are 90
The following elastomer is used as the surface layer, and JIS K-720
1. A laminate molded product comprising an inner layer of a resin having an R-scale of 75 or more as measured in No. 2.