Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Ethylenically unsaturated reactant admixed with either...
Patent
1990-11-23
1992-11-17
Short, Patricia A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Ethylenically unsaturated reactant admixed with either...
525 10, 525 42, 525425, C08L 6702, C08L 7700, C08L 7706
Patent
active
051644452
DESCRIPTION:
BRIEF SUMMARY
DETAILED DESCRIPTION OF THE INVENTION
1. Application Fields in Industries
The present invention relates to a polyamide resin composition having excellent characteristics in flexibility, chemical resistance, oil resistance, impact resistance and moldability, providing wide applications of the resin in making automobile parts and machine parts etc.
2. Background of the Art
Polyamide resins formerly aroused large demands because the resins had excellent characteristics in moldability, oil resistance, chemical resistance and heat resistance. Their uses are, however, currently restricted since the resins are still poor in impact resistance and flexibility characteristics.
Many attempts have been proposed to improve impact resistance and flexibility characteristics of the resin, including, for example, well known polyamide resin compositions in which large amounts of plasticizer is mixed in order to provide flexibility. Special polyamide resins including nylon 12, copolymers of various kinds of nylons and polyamide elastomers are known to be improved in impact resistance and flexibility characteristics, as well as compound materials in which polyamide resins are blended with polyolefins or styrene/olefin copolymers modified by unsaturated carboxylic acids.
However, these compound materials involve many problems. In the above-described compound polyamide resins containing large amounts of plasticizer, they involve the deficiency that the agents flow out during long period of use or usage at high temperature, whereby plasticity and softness of the compound resins are lost. Nylon 12, copolymers of various kinds of nylons and polyamide elastomers are more expensive than other kinds of engineering plastics and hence their applications are restricted. In a series of polyamide resins with which modified polyolefins or modified styrene/olefin copolymers are blended, as the amount of blending, increases excellent inherent characteristics of the polyamide resins are lost, entailing poor moldability and degradation in oil, chemical and heat resistances.
The present invention was carried out to solve the aforementioned problems and aims to provide a polyamide resin composition having excellent impact resistance and flexibility while maintaining the inherent excellent characteristics of oil, chemical and heat resistance. Among the polyamide resins, polyamides containing xylilene groups represented by polyxylilene adipamide possess gas-barrier characteristic, especially against chloro fluoro carbon gas thereinafter referred to as CFC gas. Since this characteristic is also maintained in the polyamide resins of the present invention, they are best suited for use as hoses for refrigerant.
DISCLOSURE OF THE INVENTION
The polyamide resin composition of the present invention comprises a polyamide resin (A) and a modified polyester elastomer (B) prepared by the reaction of a polyester elastomer with a monomer selected from among unsaturated carboxylic acids and derivatives thereof, thereby achieving the afore-described objective.
The polyamide resin compositions of the present invention are manufactured by mixing (A) polyamide resins and (B) modified polyester elastomer in the weight ratio of (A)/(B) in the range of 95/5 to 5/95 while heating.
The composition of the present invention comprises polyamide resins (A) including for instance nylon 6, nylon 6,6, nylon 6,9, nylon 6,10, nylon 6,12, nylon 6/6,6, nylon 4,6, polyxylilene adipamide, polyhexamethylene terephthalamide, polyphenylene phthalamide, polyxylene adipamide/hexamethylene adipamide, polyesteramide elastomer, polyetheramide elastomer and polyamide-dimeric acid copolymers. These materials can be used separately or in the form of their mixtures, or alternatively, copolymers manufactured from the monomers which are the constituents of above-described resins are also used. The melting point of the polyamide resins should preferably be 170.degree. C. or more in order to make the materials heat resistant. Usually, the relative viscosity of the polyamide resins should prefera
Kobayashi Shigeo
Nishida Takashi
Short Patricia A.
Toyo Boseki Kabushiki Kaisha
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