Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
1999-07-21
2001-06-19
Yoon, Tae H. (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C524S519000, C524S527000
Reexamination Certificate
active
06248834
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a thermoplastic elastomer which is excellent in profile extrudability, oil resistance, bonding properties and weather resistance and which is compatible with an olefinic material.
2. Discussion of Background
A thermoplastic elastomer is excellent in rubber elasticity, coloring properties and design latitude and can be formed by various forming methods such as injection molding, extrusion, blow molding, sheet forming and vacuum forming, like usual thermoplastic materials. Accordingly, it is used in various fields, e.g. as packing materials for automobiles and building materials, interior materials for automobiles, parts for building materials and sundry goods, and its use is rapidly expanding. Especially, an olefinic thermoplastic elastomer is light in weight, can easily be recycled and has a high cost performance, and thus, it has been used frequently in recent years. However, the olefinic thermoplastic elastomer has had a problem that during the extrusion, drawing is difficult as the melt tension is low, and it is particularly difficult to form a complicated shape by profile extrusion, whereby it has been difficult to obtain an extruded product excellent in the surface smoothness. The extruded product has had a problem that as the surface tension is low, the bonding property is poor, and even if the extruded product is bonded by means of a pressure sensitive adhesive double coated tape, it may easily be peeled. Further, the olefinic thermoplastic elastomer tends to swell against an oil such as a lubricating oil, a mineral oil, an engine oil or an animal or plant oil, and thus it has had a problem that it can not be used at a site where an oil may be applied. In such an application where oil resistance is required, a polyvinyl chloride type thermoplastic elastomer is used, but such an elastomer has had a problem that it is not compatible with an olefinic material. Under these circumstances, it has been desired to develop a material which is excellent in profile extrudability, oil resistance, bonding properties and weather resistance and which is compatible with an olefinic material.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a thermoplastic elastomer composition which is excellent in profile extrudability, oil resistance, bonding properties and weather resistance and has compatibility with an olefinic material and which is capable of being recycled.
To accomplish the above object, the present invention provides a thermoplastic elastomer composition comprising 100 parts by weight of a chlorinated polyethylene, from 5 to 1,000 parts by weight of a crystalline polyolefin resin and from 20 to 1,500 parts by weight of a rubber component, wherein the rubber component is a hydrogenated styrene type rubber or an olefinic rubber which has a Mooney viscosity [ML
1+4
(100° C.)] within a range of from 50 to 350.
REFERENCES:
patent: 5446064 (1995-08-01), Hori et al.
patent: 5914195 (1999-06-01), Hori et al.
patent: 0618260 (1994-10-01), None
Mitsubishi Chemical MKV Company
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Yoon Tae H.
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