JPS58177741A - Interior component for vehicle - Google Patents

Abstract

PURPOSE:To improve the rigidity of interior components for vehicles such as an arm rest by forming them into a hollow shape using a laminated body whose outer layer is made of the synthetic resin with surface hardness below 50 and the inner layer is made of the synthetic resin with stiffness exceeding 7,000kg/cm<2>. CONSTITUTION:The surface hardness below 50 in the outer layer of interior components for vehicles is below said value by the ASTM, D-2240 shore D and provides a soft touch. Besides, the stiffness exceeding 7,000kg/cm<2> in their inner layer exceeds said value by the ASTM, D-747 and provides the strength of the stem without deformation. As a result, this laminated body can be used in the interior components for vehicles such as an arm rest, door trim, and door lining. Since the outer layer of the interior components for vehicles is flexible and holds rigidity as a whole and is formed into a hollow shape, the total weight is small and heat insulation property is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lightweight vehicle interior component that has a flexible outer layer and maintains overall rigidity.

Traditionally, vehicle interior parts such as armrests, door trims, door linings, and console box lids have often been made by laminating synthetic leather or fabric to a metal or plastic core material, and the flexibility of the outer layer and overall quality have been Although it has rigidity, it has the problem of being heavy, and an improvement has been desired in light of the recent trend toward weight reduction in vehicles.

The present invention was arrived at as a result of various studies in view of the above circumstances, and its gist is an interior part for a vehicle characterized by having an outer layer formed in a hollow shape with a surface hardness of 50.

Examples of the hard surface synthetic resin or elastomer for the outer layer of the vehicle interior parts of the present invention include low density polyethylene, ethylene vinyl acetate copolymer, ethylene methyl methacrylate copolymer, ethylene ethyl acrylate copolymer,
Examples include ethylene acrylic acid copolymer, ethylene methyl acrylate copolymer, ionomer, chlorinated polyethylene, ethylene propylene rubber, etc. Among them, ethylene vinyl acetate copolymer, ethylene methyl methacrylate copolymer, which has less uneven thickness during blow molding, etc. Acrylate copolymers are preferred.

Synthetic resins that provide stiffness without deformation include high-density polyethylene and polypropylene. Among them, high-density polyethylene is preferred because it has excellent impact resistance and is easy to remove dust during blow molding.

Although the vehicle interior part of the present invention is formed in a hollow shape,
This shape is suitable if multilayer hollow molding is adopted, and because it is hollow, it is lightweight, and it also has heat insulation properties of the inner and outer layers as well as heat insulation properties because it is hollow. If the adhesion between the inner and outer layers is insufficient, a modified polyolefin resin grafted with an unsaturated carboxylic acid or a derivative thereof as an adhesive resin may be coextruded as an intermediate layer.

The vehicle interior parts of the present invention can be used for armrests, door trims, door linings, etc. The outer layer is flexible and maintains rigidity as a whole, and because it is hollow, it is lightweight and has heat insulation properties. .

The present invention will be explained in more detail with reference to Examples below.

The exception layer is ethylene vinyl acetate copolymer with a surface hardness of 35 (vinyl acetate content 15% by weight, melt flow index 1.029710 mm), and the inner layer is high-density polyethylene with a stiffness of 8000 kg/Crn2 (density 0.955). g/an, melt flow index 1..0.3 g/1 omi),
The outer layer has a thickness of 2I011, the inner layer has a thickness of 2, and
A hollow armrest with overall dimensions of approximately 5 crn (vertical) x 20 crn (horizontal) x 3 crn (thickness) was molded.

The outer layer of the resulting armrest had a flexible feel and did not deform even when the experimenter squeezed it as hard as he could.

Example 2 Ethylene propylene rubber (with a surface hardness of 15) was used as the outer layer.
Melt flow index 230. 0.31! /1o
mJ, stiffness 10000 kg/crn as inner layer
2 polypropylene (density 0.900 f//crn
.

Melt flow index 230, OO, 89/1
A hollow console box lid having an outer layer 2 thick, an inner layer 2 tm thick, and an overall dimension of 10 crn (vertical), 20 crn (horizontal), and 3 crn (thickness) was molded using a multilayer hollow molding method.

The outer layer of the resulting door (IJ) was soft to the touch, and although the experimenter tried to deform it with his/her arms as best he could, no equivalent deformation was observed.

Patented wheat flour Showa Denko Co., Ltd. Agent: Patent attorney Sei Kikuchi

Claims (1)

[Claims] The outer layer is made of synthetic resin or elastomer with a surface hardness of 50 or less,
An interior part for a vehicle, characterized in that it is formed into a hollow laminate whose inner layer is made of synthetic resin with a stiffness of 7,000 kg and 7 cm2 or more.