Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1996-07-24
1998-05-12
Hampton-Hightower, P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528335, 528332, 528338, 528339, 528340, 528347, 528349, C08G 6908, C08G 7310
Patent
active
057506396
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to polyamide resin compositions and a type of polyamide resin molding, characterized by the fact that the molding is made of a polyamide resin composition with excellent fluidity during the molding process, and it has excellent mechanical characteristics, heat resistance, chemical resistance and dimensional stability when moisture is absorbed, so that it has a wide range of applications, including parts used in automobiles, electrical/electronic parts, and furniture.
Conventional polyamide resins, such as nylon 66, nylon 6, nylon 612, etc., are aliphatic polyamide resins with a certain level of heat resistance and excellent mechanical characteristics. Consequently, these resins are used in a wide range of applications, such as resin moldings as substitutes for metal parts and resin moldings as substitutes for the parts made of heat-setting resins. However, in some applications, when moisture is absorbed, nylon 6 and nylon 66 exhibit characteristic dimensional changes. Also, stress cracks may take place due to chemicals.
In order to improve the chemical resistance, in particular, the resistance against calcium chloride, and other inorganic salts, for these nylons, nylon 612 or a mixture of nylon 612 and nylon 66 has conventionally been used. However, for the aforementioned mixture, the heat resistance drops due to the presence of nylon 612. This is a disadvantage.
In various applications, different problems exist with current materials.
In the furniture field, glass-fiber-reinforced nylon 66 is widely used in place of conventional metal parts in manufacturing chairs and other articles of furniture used in offices and homes. However, for the aforementioned glass-fiber-reinforced nylon 66, dimensional variation and degradation in properties take place due to moisture absorption.
Additionally, nylon 6 is also used to mold furniture parts to ensure good appearance of the moldings. However, in the case of moisture absorption, dimensional variation and degradation in properties become even more significant when nylon 6 is used.
For the outer parts of electrical products, such as rice cookers, irons, and other home appliances, as well as word processors and other office automation equipment, superior mechanical characteristics such as the ability to withstand high application temperatures, high resistance against hydrolysis and high heat resistance to the high temperatures applied on the products during soldering are required. Also, the appearance of the moldings should be good for some products. However, for the moldings made of the conventional polyamide resin compositions and polyester resin compositions, it is difficult to fully meet the aforementioned requirements.
As parts of electrical/electronic products, such as sealants for connectors, coil bobbins, coils, etc., it is possible to make use of polyamide resin compositions and polyester resin compositions. For these sealants, in addition to the high solder heat resistance, the parts should have a small thickness in order to reduce the weight of the parts. As nylon 66 has good fluidity, it is able to flow through the narrow gaps in the molding dies, so that thin-wall moldings can be formed. On the contrary, the solder heat resistance is poor. This is a disadvantage.
Regarding automotive applications, polyamide resins, in particular, reinforced polyamide resins, are used in manufacturing engine covers, parts connected directly to the engine covers, such as connectors, air intake manifolds, and other engine body parts, radiator tanks, caps, and other cooling system parts, canisters, pipelines, pump parts and other fuel system parts. They are also widely used in manufacturing the general connectors, relay boxes, gears, clips, etc., at present. In particular, nylon 66 is an appropriate type of material for the aforementioned applications, as it has excellent heat resistance, moldability and toughness. However, as pointed out above, when the aforementioned materials are used, variations in dimensions and propert
REFERENCES:
patent: 4603166 (1986-07-01), Poppe et al.
patent: 4937315 (1990-06-01), Barthelemy
patent: 4937322 (1990-06-01), Barthelemy
patent: 5006601 (1991-04-01), Lutz et al.
patent: 5122570 (1992-06-01), Subramanian
patent: 5302691 (1994-04-01), Soelch
patent: 5322923 (1994-06-01), Lahary et al.
patent: 5436294 (1995-07-01), Desio et al.
patent: 5440006 (1995-08-01), Lahary et al.
E. I. Du Pont de Nemours and Company
Hampton-Hightower P.
LandOfFree
Polyamide resin composition and molding thereof does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polyamide resin composition and molding thereof, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polyamide resin composition and molding thereof will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-979942