Process for the manufacture of nonwoven surfaces
AssigneeRhodia Operations
InventorsRoland Durand, Bertrand Bordes, Matthieu Helft, Caroll Vergelati
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Abstract
The present invention relates to a novel process for the manufacture of nonwoven surfaces. It relates more particularly to a process for the manufacture of nonwoven surfaces by the process of direct melt spinning of continuous filaments arranged in the form of a sheet. This process employs a composition based on a thermoplastic polymer exhibiting an electrical conductivity sufficient to prevent the formation of electrostatic charges or to allow their removal during the spinning process.
Claims15
A process for the manufacture of nonwoven surfaces by direct melt spinning of filaments of a composition based on thermoplastic polymers comprising the steps of:
- a) feeding the composition to a plurality of spinnerets each comprising several spinning orifices,
- b) feeding the filaments to a pneumatic attenuation device and a stage in which the filaments obtained are formed into a sheet,
- wherein the composition based on thermoplastic polymers comprises a polymeric matrix and/or a modifying polymeric additive comprising repeat units corresponding to the following general formulae:
- in which:
- R1, R2, R3 and R4, which are identical or different, represent aliphatic, cycloaliphatic or aromatic hydrocarbon chains comprising from 2 to 18 carbon atoms,
- R5 represents a polyether radical with a molecular weight of between 400 and 200 000,
- A and B represent the CO, NH or O groups;
- when A represents CO, B represents NH or O and vice versa,
- with the proviso that
- (a) when the additive is absent, the polymeric matrix comprises at least one of the repeat units I or II and at least one of the repeat units III or IV;
- (b) when the additive is present, the polymeric matrix comprises at least one of the repeat units I or II.
Dependencies are inferred from the claim text.