Basf Aktiengesellschaft

Basf Se Corporation

Grasim Industries Limited

Eric Uerdingen

Michael Lutz

Frank Hermanutz

Michael Siemer

Frank Gaehr

Thomas Wisniewski

Klemens Massonne

Matthias Maase

Veit Stegmann

Bir Kapoor

Aditya Shrivastava

Uwe Vagt

Preeti Lodha

Parag Patil

Kishore Shouche

Massonne Klemens

The present invention provides a process for producing low fibrillating cellulose fibers by a dry-jet-wet spinning process wherein cellulose is treated with a solvent containing imidazolium ionic salt in a spinneret maintained at a temperature of 100-120&#xb0; C. and the spun fibers drawn to the coagulation bath containing ionic salt with the draw ratio less than 5, to produce fibers with fibrillating index less than or equal to 3.

Process for manufacturing low-fibrillating cellulosic fiber

The invention relates to a method for producing regenerated biopolymers in the form of carbohydrates, using a solvent system that contains the biopolymers dissolved therein. The solvent system is based on a melted ionic liquid and optionally a protic solvent or a mixture thereof. The biopolymers dissolved in the solvent system are precipitated in a coagulation medium, said medium comprising a protic coagulant or a mixture of protic coagulants. The method according to the invention is characterized in that the surface tension &#x3c3; of the coagulant or the mixture of coagulants is 99% to 30% of the surface tension &#x3c3; of water, the surface tension being measured according to ASTM D 1590-60 at a temperature of 50&#xb0; C. The method according to the invention is economical and flexible and leads to advantageous products, especially in the form of staple fibers which are especially not fibrillated and have an advantageous wet to dry strength ratio.

Method for producing regenerated biopolymers and regenerated products obtained by said method

A solution system for biopolymers in the form of carbohydrates based on a molten ionic liquid, additives optionally being contained in the solution system, is described. This solution system contains a protic solvent or a mixture of several protic solvents, and in the case where the protic solvent is solely water, this is present in the solution system in an amount of more than about 5 wt. %. Carbohydrates can be incorporated into the solution system, in particular in the form of starch, cellulose and derivatives thereof, and it can then be used for regeneration of the carbohydrates contained therein. A particularly advantageous process for the preparation of the solution system containing the carbohydrates and for the preparation of regenerated carbohydrates, in particular in the form of regenerated cellulose fibers, is moreover described. The invention accordingly also provides such spun fibers as are distinguished in that they are non-fibrillating. The invention offers in particular economic advantages over the systems of the prior art.

Method of forming regenerated carbohydrates with solvent systems based on molten ionic liquids

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Speyer, Germany

Eric Uerdingen