N-hydroxyalkyltrimellitimide esters and bis-(trimellitimide) esters and method of making
View Patent ↗The present invention relates to trimellitic anhydride imide ester, a method of making it, and polyesters or polyamides that can be modified with trimellitic anhydride (TMA) to provide better heat resistance and mechanical properties. With the present invention, there are two processes for making TMA-ester. The first process is by charging into a reactor equimolar amounts of trimellitic anhydride and primary hydroxyalkylamine, primary carboxylalkylamine or primary carboxylarylamine, with an excess of alcohol or diol. The second process for producing the imide ester is to react two moles of TMA with one mole of a diamine of the formula H 2 N—X—NH 2 with an excess of alcohol or diol; where X is an aliphatic, alicyclic, or aromatic group. Generally the reactor contains water as a dispersant for the reactants. The reaction time is from about 1-8 hours. The reaction temperature is from about 160° C. to about 220° C. After the cessation of water/alcohol production, the reaction is finished and the contents of the reactor can be cooled to cause the desired solid product to precipitate our. The solid is then separated by filtration or centrifugation.
1. A one step reaction process for the production of bis-trimellitimide ester monomers, comprising:
reacting a 2:1 molar ratio of trimellitic anhydride and at least one diamine, and an excess of alcohol, or diol, or both,
wherein said diamine is of the formula H 2 N—X—NH 2 , and X is selected from the group consisting of aliphatic, alicyclic, and aromatic, or a mixture of these.
2. The process of claim 1 , wherein said reaction temperature is between about 160° C. to about 220° C.
3. The process of claim 1 , wherein said excess of alcohol or diol is between 1.1-20 moles alcohol or diol to one mole of trimellitic anhydride or 0.5 mole diamine.
4. The process of claim 1 , wherein water is added to said reaction creating an aqueous solution to aid in dispersing the reactants.
5. The process of claim 1 , wherein said reaction time is about 1-8 hours.
6. The process of claim 4 , wherein said aqueous solution is cooled, and said bis trimeilitie imide ester is precipitated as a solid.
7. The process of claim 6 , wherein said solid is filtered or centrifuged.
8. The process of claim 1 , wherein said diamine contains 2 to 16 carbon atoms.
9. The process of claim 8 , wherein said diamine is selected from the group consisting of ethylenediainine; trimerhylenediamine, tetramethylenediamine: pentamethylenediamine; hexamethylenediamine; heptamethylenediamine; ocraniethylenediamine; 1,4-diaminocyclohexanti; 1,4-bis(aminomethyl)cyclohexane; bis-(4-aminocyclohexyl)methane; isophoronediamine; meta-xylylenediamine; para-xylylenediamine; 4,4′-diaminodiphenylinethane; 4,4′-diazninobiphenylpropane; 4,4′-diaminodiphenylsulfone; m-phenylenediamine; p-phenylenediarnine; 2,6-diaminonaphthalene; and 1,5-diaminonaphthalene.
10. The process of claim 1 , wherein said dianiine is selected from the group consisting of ethylenedianiine; isophoronediamine; meta-xylylenediamine; and 4,4′-diarninodiphenylmethane and said excess of alcohol, diol, or both is ethylene glycol.
11. A copolymer of the product of claim 1 and polyamide.
12. The copolymer of claim 11 wherein said polyamide is at least one of nylon 6, nylon 6/6, nylon 6/10, nylon 11, nylon 12, nylon 6/12, nylon 10/12, nylon 4/6, nylon 6/9, or aramides selected from the group consisting of poly(m-phenylene iso-phthalamide), poly(p-phenylene ter-plithalamide), and poly(phthalamide), and copolymers based on these.
13. A copolymer of the product of claim 1 and at least one of polyethylene terephthalatc (PET), polybutylene terephthalate (PBT), poly(trimethylene) terephthalate (PTT), polyethylene isophthalate (PEI), and polyethylene naphthalate (PEN), or copolymers of these.