Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1996-08-16
1999-09-14
Seidleck, James J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
452448, 452405, 452445, 452451, 430425, 430423, 430449, 430502, C08J 510, C08K 310, C08L 3106
Patent
active
059524162
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a thermosetting resin composition for a sliding member.
BACKGROUND ART
In recent years, plastics materials as a substitute for metal materials have been actively researched and developed. These materials require various properties depending on their applications. For example, in the case of molded components having a sliding portion such as magnet switches, switch parts or the like among the components of electrical machinery and apparatus, importance is attached to the abrasion resistance and sliding characteristics of the molded components.
On the other hand, moldings of glass fiber reinforced unsaturated polyester resin produced by integrally molding and curing an unsaturated polyester resin, i.e. a typical thermosetting resin, and glass fibers are excellent in impact resistance, tensile strength, bending strength, etc. but have a drawback of poor slidability. Of thermosetting resins, resins such as melamine resins have high surface hardness and great abrasion resistance. However, once a single layer of hard surface has worn off, these resins become unsatisfactory in abrasion resistance like unsaturated polyester resins. Further, said resins are insufficient in lubricity.
The addition of a specific resin has been known as means for improving the abrasion resistance and slidability of thermosetting resins. For example, there have been proposed the addition of polytetrafluoroethylene resin (Teflon) powder (Japanese Unexamined Patent Publication Sho 51-81,852), and the addition of polyethylene (Japanese Unexamined Patent Publications Sho 51-89,546, Sho 51-111,284, Sho 56-74,147 and Sho 58-63,752) and so on.
The addition of asbestos, potassium titanate, wollastonite or the like has been proposed to incorporate fine reinforced fibers as part of a filler. The addition of potassium titanate fibers is known to effectively improve the sliding characteristics and the abrasion resistance (Japanese Unexamined Patent Publications Sho 58-76,413, Sho 59-176,313 and Sho 62-43,454, etc.).
However, these conventional methods failed to give resin compositions which are satisfactory in the excellent sliding characteristics and great abrasion resistance as required when the resin is used as the material for a sliding member.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a thermosetting resin composition which can impart high slidability and great abrasion resistance while maintaining the excellent properties of thermosetting resins such as outstanding heat resistance, high-precision moldability, long-term durability, great mechanical strength, etc.
The inventors of the present invention conducted extensive research to achieve the above-mentioned object and found that a resin composition with the undermentioned specific formulation has the desired properties. The present invention has been completed based on this novel finding.
According to the present invention, there is provided a thermosetting resin composition for a sliding member, the composition comprising 100 parts by weight of a thermosetting resin, 50 to 600 parts by weight of an inorganic filler and 2 to 20 parts by weight of polyolefin powder having a particle size of up to 200 .mu.m, the inorganic filler containing potassium titanate fibers in an amount of 2 to 35 parts by weight per 100 parts by weight of the thermosetting resin.
According to the present invention, there is also provided a thermosetting resin composition which can improve the sliding characteristics and abrasion resistance while maintaining the outstanding properties of thermosetting resins such as excellent heat resistance, high-precision moldability, long-term durability, great mechanical strength, etc.
Examples of thermosetting resins which can be used in the invention include a wide variety of conventional thermosetting resins such as unsaturated polyester resins, vinyl ester resins, phenolic resins, epoxy resins, melamine resins, diallyl phthalate resins, etc.
Useful unsaturated polyester
REFERENCES:
patent: 4303762 (1981-12-01), Nakayama et al.
Matsubara Akira
Tani Kiyozumi
Otsuka Kagaku Kabushiki Kaisha
Rajguru U. K.
Seidleck James J.
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