JP3599865B2 - Polymer composition - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to compositions of crosslinked chlorinated ethylene copolymer alloys. More specifically, the present invention relates to a chlorinated ethylene copolymer crosslinked alloy composition which has excellent slidability and is particularly suitable as an ascending and descending guide part of a window glass for automobiles.
[0002]
[Prior art]
A chlorinated ethylene copolymer cross-linked alloy (hereinafter may be simply referred to as a chlorinated polymer alloy) has the same appearance, feel and mechanical properties as chloroprene rubber and nitrile rubber, and also has the same properties as thermoplastic resins. Since it can be processed by extrusion molding, injection molding, hollow molding, calendar molding, and the like, it is expected to be used for applications such as automobile parts, industrial parts, and building materials. For example, ascent and descent components for automotive window glass such as glass runs and weatherstrip door moldings have sufficient properties such as flexibility, elasticity, abrasion resistance, weather resistance, chemical resistance, and sealing properties of chlorinated polymer alloys. This is an application that can be used for There are various kinds of structures for the elevating guide parts of such window glasses for automobiles. Depending on the structure, when a chlorinated polymer alloy having a large frictional resistance is used, the sliding resistance of the window glass becomes too large. was there.
[0003]
[Problems to be solved by the invention]
Therefore, the present inventors have attempted to improve the slidability without substantially impairing the excellent properties of the chlorinated polymer alloy. Addition of a lubricant can be considered as the simplest method of improving the slidability, but as a result of examining a large number of lubricants, many of the generally known lubricants cannot exhibit the effect of the addition. The inventors have found that only the alkylene oxide exerts the desired effect, and have reached the present invention.
[0004]
[Means for Solving the Problems]
The present invention relates to a polymer composition comprising 100 parts by weight of a crosslinked chlorinated ethylene copolymer alloy and 0.5 to 5 parts by weight of polyethylene glycol having a molecular weight of 200 to 600 .
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
The crosslinked chlorinated ethylene copolymer alloy is a thermoplastic rubber having a bonded chlorine and a partially crosslinked structure of an ethylene copolymer, and has a permanent elongation of 20% or less, preferably 10% or less, and a Shore A hardness of 50 to 95. Preferably, the melt flow rate measured at 55 to 90, 190 ° C. and 10 kg load has a characteristic of 1 to 100 g / 10 min, preferably 2 to 50 g / 10 min, and from Mitsui DuPont Polychemical Co., Ltd. It is sold under the trade name "Arculin".
[0006]
In the present invention, polyethylene glycol having a molecular weight of 200 to 600 , preferably 300 to 600 is used in an amount of 0.2 to 5 parts by weight, preferably 0.4 to 3 parts by weight, based on 100 parts by weight of the chlorinated polymer alloy. Mix. Even if the molecular weight of the polyethylene glycol is more than the above range, the effect of improving the slidability is hardly recognized. Further, even if a generally used lubricant such as silicone oil, polyethylene wax, fatty acid salt, fatty acid amide, etc. is blended, it has little effect on the improvement of the sliding property.
[0007]
The polymer composition of the present invention comprising a chlorinated polymer alloy and polyethylene glycol may optionally contain various additives. Examples of such additives include an antioxidant, a heat stabilizer, a weather resistance stabilizer, a colorant, and an inorganic filler.
[0008]
Various molded articles can be produced from the polymer composition of the present invention by various molding methods such as extrusion molding, injection molding, hollow molding, and calendar molding. In such molding, special molding methods such as coextrusion with different materials, multilayer molding, and insert molding can also be employed.
[0009]
Such a molded article can be used for a wide range of applications, but one of the applications that makes use of the excellent sliding property is an ascent / descent guide component for a window glass for an automobile. For example, a sash holder for a door mirror of a hard-top type automobile has conventionally been manufactured by using vulcanized rubber as a polymer, attaching the sash to the sash by press molding, and implanting hair to impart slidability. The process was complicated and the productivity was low. On the other hand, when the polymer composition of the present invention is used, it can be integrated with a sheet metal insert by insert injection molding, so that the production speed is high, and since it has excellent slidability, there is no need for flocking. In particular, it is more effective to roughen the sliding surface with glass in order to further improve the slidability.
[0010]
【The invention's effect】
The composition of the present invention contains a polyethylene glycol having a specific molecular weight, thereby providing excellent properties of the chlorinated polymer alloy, such as weather resistance, heat resistance, oil resistance, chemical resistance, cold resistance, rubber elasticity, flexibility, and processing. Since the slidability is remarkably improved while maintaining the slidability, it is particularly useful as a material for ascending and descending guide parts of window glass for automobiles, such as sash holders for automobile door mirrors.
[0011]
【Example】
[Example 1]
(Sheet creation)
A chlorinated ethylene copolymer cross-linked alloy (Mitsui-Dupont polychemical product Arcrin J2060BK) was added with a predetermined amount of polyethylene glycol (average molecular weight: 400) as a lubricant, and the mixture was kneaded with two rolls. 180 ° C.). At this time, the following two types of embossed sheets having a pressed sheet surface and an embossed sheet were prepared.
Embossed surface 1 = 80 mesh sandpaper surface transfer Embossed surface 2 = 180 mesh sandpaper surface transfer
(Sliding friction test)
Thereafter, the above sample was left at 23 ° C. and a humidity of 60% for 24 hours or more, and subjected to a sliding friction test by the following method.
Measuring device: Sliding friction test measuring device manufactured by Tester Sangyo Co., Ltd. Measuring method: Based on JIS K7125.
Measurement condition:
Fixed side: Glass (load cell side)
Moving side: The press sheet sample take-up speed: 100 mm / min. The measurement results of the coefficient of dynamic friction are shown in Table 1. In Example 1 using the composition of the present invention, high slidability in which the dynamic friction coefficient greatly exceeded the desired value of 0.4 or less was exhibited.
[0013]
[Comparative Example 1]
The same chlorinated ethylene copolymer cross-linked alloy (Alculine J2060BK, Mitsui / Dupont Polychemical Co., Ltd.) used in Example 1 was subjected to a sliding friction test in the same manner as in Example 1 without adding polyethylene glycol, and a dynamic friction test was performed. The coefficient was measured. Table 1 shows the results. In the case of a chlorinated ethylene copolymer crosslinked alloy in which no lubricant is added, the dynamic friction coefficient is larger than the desired value of 0.4.
[0014]
[Comparative Examples 2 to 7]
The chlorinated ethylene copolymer cross-linked alloy (Mitsui-Dupont Polychemical product Arcrin J2060BK) used in Example 1 was replaced with polyethylene glycol in the form of one or more lubricants shown in Table 1 in the amounts shown in Table 1. It was blended and subjected to a sliding friction test in the same manner as in Example 1 to measure the dynamic friction coefficient. Table 1 shows the results. In each case, the desired kinetic friction coefficient of 0.4 or less was not obtained.
[0015]
[Table 1]

Claims (1)

A polymer composition comprising 100 parts by weight of a crosslinked chlorinated ethylene copolymer alloy and 0.2 to 5 parts by weight of polyethylene glycol having a molecular weight of 200 to 600 .