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
1993-07-09
1997-06-17
Michl, Paul R.
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...
525423, 528335, 528340, C08J 510, C08K 1100, C08L 7700, C08L 7900
Patent
active
056398190
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of /CA92/00011, Jan. 8, 1992.
The present invention relates to polyamides, and especially to mouldable reinforced polyamide compositions which have excellent heat resistance characteristics, mechanical and physical properties and moulding characteristics. The polyamides are formed, in part, from 2-methyl-pentamethylene diamine units.
A wide variety of polymers e.g. polyethylene and polypropylene, may be used in moulding processes, including compression moulding, injection moulding and extrusion moulding, to give high quality products. However, such polymers may lack the physical or other characteristics required in many applications. Other polymers, frequently referred to as engineering polymers, have improved characteristics that are useful for more demanding end-uses. Such polymers include polyesters and polyamides that have been modified e.g. by the addition of toughening agents or, in particular, the addition of reinforcing agents. For example, heat-resistance characteristics, mechanical properties and/or physical and chemical properties may be improved by incorporating fillers such as glass powder, graphite powder, glass fibres and carbon fibres or minerals of various types into the polymers.
Among the more important polymers used in moulding applications is polyhexamethylene adipamide, also known as nylon 6,6. This polymer has acceptable properties for many end-uses. When filled with toughening agents, glass fibres and/or mineral fillers, nylon 6,6 may also be used in certain engineering applications. Another polymer widely used in moulding applications, including in some engineering end-uses, is polycaprolactam, also known as nylon 6. While both nylon 6,6 and nylon 6 have repeating units of similar length, moulded products made from these two polymers tend to exhibit different characteristics.
In particular, compositions based on nylon 6 tend to exhibit superior gloss when moulded compared with corresponding compositions based on nylon 6,6.
It has now been found that polymer compositions based on a polyamide having 2-methyl-pentamethylene diamine as a comonomer, when filled with e.g. glass fibres and/or minerals, have useful moulding characteristics, including a variety of improved physical characteristics. Related polyamides have also been found.
Accordingly, the present invention provides a mouldable reinforced polyamide composition comprising: mole percent of at least one aliphatic diamine having 4-12 carbon atoms and a complementary amount of 2-methyl-pentamethylene diamine polymerized with at least one aliphatic dicarboxylic acid having 6-12 carbon atoms, the polyamide having a relative viscosity greater than about 20; and weight of said polyamide.
In preferred embodiments of the compositions of the invention, the aliphatic dicarboxylic acid is adipic acid or 1,12-dodecanedioic acid.
The present invention also provides a polyamide consisting essentially of between about 0 and about 99.5 mole percent of at least one aliphatic diamine having 4-12 carbon atoms and a complementary amount of 2-methyl-pentamethylene diamine polymerized with at least one aliphatic dicarboxylic acid having 6-12 carbon atoms, the polyamide having an RV greater than about 20; with the proviso that the polyamide is not a copolyamide consisting essentially of between about 60 and about 99.5 mole percent hexamethylene adipamide units and between about 0.5 and 40 mole percent 2-methyl-pentamethylene adipamide units with an RV greater than about 25 and a melting point of greater than about 220.degree. C.
The present invention further provides a polyamide consisting essentially of between about 0 and about 99.5 mole percent of at least one aliphatic diamine having 4-12 carbon atoms and a complementary amount of 2-methyl-pentamethylene diamine polymerized with 1,12-dodecanedioic acid, the polyamide having an RV greater than about 20 and a solubility in methanol at 65.degree. C. of less than 5% by weight.
Additionally, the present invention provides an article formed from a polyamide consisting essentia
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patent: 5194578 (1993-03-01), Anton
Farkas Nicholas
Marks David Neil
Nemser Stuart Marshall
Du Pont Canada Inc.
E. I. Du Pont de Nemours and Company
Michl Paul R.
Rajguru U. K.
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