Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1995-12-20
1998-06-16
Short, Patricia A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525151, C08L 2712, C08L 6703, C08L 6704
Patent
active
057671982
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELDS
The present invention relates to a thermoplastic resin composition which comprises a blended composition prepared by mixing a perfluoro type polymer and a liquid crystal polyester and has improved dispersibility and interfacial adhesivity to each other. More specifically the present invention relates to a thermoplastic resin composition which comprises a blended composition prepared by mixing a perfluoro type polymer having methylol groups at the ends of the molecular chain thereof and a liquid crystal polyester.
BACKGROUND ART
Perfluoro type fluorine-containing resins (e.g., PTFE, FEP, PFA and the like) can be used in a wide temperature range and are excellent in chemical resistance, alkali resistance, acid resistance, water resisting property, weather resistance, corrosion resistance, wear resistance, dielectric property and the like, and therefore are used for various uses such as lining materials for pipes, valves, pumps or the like, flexible tubes, films, wafer baskets, pump impellers, machine parts and chemical experimental instruments.
However there are many cases where those resins are inferior in mechanical properties, physical thermal resistance shown by a deflection temperature under load, dimensional stability shown by a coefficient of by linear expansion, moldability and the like.
Particularly since the coefficient of linear expansion is large, there is a case where a thermal deformation occurs when using under the condition of a significant variation of temperature or in a high temperature range. Therefore it is difficult to use molded articles comprising the above-mentioned fluorine-containing resin for parts requiring high accuracy in the field of electronics and for pipes and lining materials which are used on chemical equipments.
Irrespective of attempts made to add inorganic fillers such as carbon fibers and glass fibers to the fluorine-containing resins in order to improve mechanical strength, deflection temperature under load and dimensional stability of molded articles, enough effect is not attained since their affinity such as dispersibility and interfacial adhesivity with the fluorine-containing resin are inferior. On the contrary, moldability and excellent surface properties (non-stickiness, excellent friction property and the like) of fluorine-containing resins are lowered, and at the time of recycling, the fillers are easy to be cut, thereby causing decrease in strength by the repeated recycling.
Also various attempts have been made to improve these drawbacks of the fluorine-containing resin by composing with non-fluorine type heat resisting thermoplastic resin. Among them, a composition with an aromatic polyester forming an anisotropic melt, i.e., a liquid crystal aromatic polyester (hereinafter referred to as "liquid crystal polyester") is reported.
For example, in JP-A-165647/1989 and JP-A-110156/1990, attempts to add, for example, the above-mentioned liquid crystal polyester and the like have been made to lower a coefficient of linear expansion without impairing weather resistance, chemical resistance, wear resistance and antisoil property of the fluorine-containing polymer such as polyvinylidene fluoride (PVDF) and further for the purpose to improve mechanical properties and moldability. A blend of liquid crystal polymer and polytetrafluoridethylene (PTFE) is described, for example, in JP-B-5693/1992, JP-A-230756/1988, etc.
However since surface energy of the fluorine-containing polymer is low, generally there is a problem that its affinity with other materials is inferior. As a result, when the fluorine-containing resin and the liquid crystal polyester are melt-blended, phase separation occurs, i.e. its interfacial adhesivity being substantially nothing and thus interfacial adhesion failure is easy to occur. Also at the time of blending, the liquid crystal polyester is difficult to disperse into the fluorine-containing resin and aggregation occurs, and thus it is difficult to sufficiently exhibit the effect of adding the liquid crystal polyester.
In ord
Araki Takayuki
Shimizu Tetsuo
Yamamoto Yoshihisa
Yamato Takafumi
Daikin Industries Ltd.
Short Patricia A.
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