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
1981-01-07
1982-11-09
Schain, Howard E.
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...
26433112, 26433119, 528125, 528128, 528172, 528173, 528226, 528185, 528188, 528189, 528229, 528335, 528337, 528348, 528350, 528352, C08G 7314
Patent
active
043585612
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The field of the invention relates to the preparation of random linear injection moldable amide-imide copolymers which process comprises reacting fully or partially acylated aromatic diamines with aromatic tricarboxylic acid anhydrides, aromatic dicarboxylic acids or mixtures of aromatic tricarboxylic acid anhydrides and aromatic dicarboxylic acids and to novel polytrimellitic amide-imide copolymers and copolyamides and to molded objects and fibers prepared from these copolymers and copolyamides.
2. Background
Amide-imide and polyamide polymers and copolymers are a relatively new class of organic compounds known for their solubility in nitrogen containing solvents when in the polyamic acid form. The major application of these amide-imides has been as wire enamels and film formers. This is illustrated in U.S. Pat. Nos. 3,852,106 (1974), 3,817,942 (1974), 3,661,832 (1972), 3,454,890 (1970) and 3,347,942 (1967). British Specification No. 570,858 (1945) discloses the general state of the art.
Polyimide and polyamide-imide polymers have also been found useful for molding applications as shown in U.S. Pat. Nos. 4,016,140 (1977), 3,654,227 (1972) and 3,573,260 (1971).
The general object of this invention is to provide injection moldable amorphous linear amide-imide copolymers and polyamides. A more specific object of this invention is to provide a novel process for the manufacture of injection moldable amide-imide and amide copolymers and copolyamides by reacting fully or partially acylated aromatic diamines with aromatic tricarboxylic acid anhydrides, aromatic dicarboxylic acids, or mixtures of aromatic dicarboxylic acids and aromatic tricarboxylic acid anhydrides. Another object is to provide novel polyamide-imide or polyamide polymers or copolymers suitable for use as an engineering plastic particularly for and in injection molding. Other objects appear hereinafter.
We have discovered a novel melt condensation process in which fully or partially acylated aromatic diamines are reacted with aromatic tricarboxylic anhydrides, aromatic dicarboxylic acids or mixtures of aromatic tricarboxylic acid anhydrides with aromatic dicarboxylic acids to yield engineering plastics suitable for injection molding which feature very high tensile strength and heat distortion temperatures. Our novel process for the preparation of random linear injection moldable amide-imide and amide copolymers and copolyamides comprises reacting fully or partially acylated aromatic diamines with aromatic tricarboxylic acid anhydrides, aromatic dicarboxylic acids or mixtures of aromatic tricarboxylic acid anhydrides with aromatic dicarboxylic acids in a molar ratio of about 9:1 to about 1:9 at a temperature of about 150.degree. to 750.degree. F.
In the prior art, melt reaction of aromatic tricarboxylic acid anhydride compounds with aromatic diamines have produced products which are not suitable for injection molding application. The reason for this is not known, but it is specified that various side reactions occur. It has now been discovered that when fully or partially acylated aromatic diamines are reacted, injection molding grade polyamide-imide copolymers are produced. In our process we usually acylate more than half of the diamines utilized in the reaction. The preferred acylation is about 70 to 100 percent of the total amine functionality.
Evidence for linearity for our novel copolymer is demonstrated by the solubility of the polymer. Polymers produced from aromatic tricarboxylic acid anhydride compounds such as trimellitic acid anhydride and aromatic diamines via various melt polymerization methods generally show little or no solubility for products having inherent viscosity in excess of 0.5. The copolymer produced according to the novel process utilizing partially or fully acylated diamines is essentially soluble after curing with inherent viscosities in the range of 0.6 to 3.0. For the purpose of this invention, inherent viscosity is measured at 25.degree. C. and 0.5% w/v in 100% sul
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Keske Robert G.
Stephens James R.
Blumberg Gunar J.
Magidson William H.
McClain William T.
Schain Howard E.
Standard Oil Company (Indiana)
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