Dsm N.v.

Bartholomeus J M Plum

Jacobus Antonius Loontjens

Rudolfus A T M Van Benthem

Petrus M M Nossin

Patrick H M Hendriks

Johan E G A Jansen

High-molecular polyamide

The invention relates to a compound comprising a reaction product of (A) an isocyanate functional compound of which at least 40 wt. %, relative to the total amount of (A), has a molecular weight of at least about 500, and (B) a nitrogen-containing compound capable of reacting with said isocyanate functional compound (A). The reaction product has a molecular weight of less then about 20,000 and comprises an effective amount of groups that are able to form reversible intermolecular physical interactions such that a resulting compound shows polymeric mechanical properties at a temperature below a transition temperature. The nitrogen-containing compound is, for instance, melamine, urea, acetoguanamine, benzoguanamine, cyanamide, dicyanamide, thiourea, isocytosine, pyrimidone or aminopyridine. The supramolecular compound comprising a suitable amount of the reaction products exhibits a relatively high elongation at break.

Supramolecular compound

The invention relates to a process for the preparation of an aromatic bisoxazoline in which, in a first step, an aromatic carboxylic acid or an ester hereof reacts with an alkanolamine, after which the hydroxyalkylamide obtained is in a second step converted into an aromatic bisoxazoline in the presence of a catalyst. The catalyst is phosphinic acid, a (C -C ) alkyl phosphinic acid, a (C -C )aryl phosphinic acid or an ester or an anhydride derived from one of these acids.

Preparation of an aromatic bisoxazoline

Process for the preparation of an N-alkyl or N-aryl carbamoyl derivative

A high molecular weight polyester-amide block copolymer is produced by reacting a mixture of lower molecular weight polyester and polyamide in the melt with a carbonyl bislactam, especially carbonyl biscaprolactam. The higher molecular weight block copolymer may be obtained in as short a time as 2 minutes, whereas, at least about 10 minutes is required in a conventional process, under comparable conditions, using a bislactam.

The invention relates to a process for preparing a high-molecular polyamide or polyester by melt-mixing polyamide or polyester having a lower molecular weight with a carbonyl bislactam having formula 1, in which n&equals;an integer of between 3 and 15. With the process according to the invention a permanent increase in the molecular weight of a polyamide is obtained within 2 minutes, whereas this takes at least 10 minutes under comparable conditions using a bislactam according to the state of the art.

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Meerssen, Netherlands

Bartholomeus J M Plum