Increasing the molecular weight of polycondensates and stabilizi

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...

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524 99, 524102, 524125, 524492, 528492, C08K 534, C08K 553, C08K 334

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060281294

ABSTRACT:
The invention relates to a process for increasing the molecular weight of polycondensates and at the same time stabilizing them, essentially without crosslinking, which comprises heating a polyamide, a polyester, a polycarbonate or a copolymer or blend of these polymers with addition of at least one diepoxide comprising terminal epoxide groups and as a further structural element a tetramethylpiperidine radical located centrally between the epoxide groups to a temperature which is above the melting point of the polymer in the case of crystalline polycondensates or above the glass point in the case of amorphous polycondensates. The invention additionally relates to mixtures comprising the corresponding diepoxides, to their use, and to polycondensates prepared from them.

REFERENCES:
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patent: 4703072 (1987-10-01), Helwig et al.
patent: 5747606 (1998-05-01), Pfaendner et al.
patent: 5807966 (1998-09-01), Pfaendner et al.
R.-E. Grutzner et al., Kunststoffe, 82, (1992), 4, pp. 284-288.
S. Fakirov, Kunststoffe, 74, (1984), 4, pp. 218-221.
Chem Abstr. 91:124534a.
Derwent Abstr. 91-030649 for EP 410230.
Chem. Abstr. 1984:492273 for Kunststoffe 74, (1984), 4 pp. 218-221.

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