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US 6,716,523 B2Granted
Spandex and it's preparation with dispersant slurry
AssigneeE. I. Du Pont de Nemours and Company
InventorsThomas Edward Carney, Oliver Gutsche, Kai-Volker Schubert
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Abstract
A dispersant slurry for making spandex, based on phosphated block poly(alkylsiloxane)-poly(alkyleneether) alcohol or aromatic- or alkylaromatic-terminated phosphated poly(alkyleneether) alcohol dispersants, is provided.
Claims6
Spandex prepared with a dispersant slurry consisting essentially of:
- (A) 10-78 wt%, based on the total weight of the dispersant slurry, of an inorganic particulate;
- (B) 2-50 wt%, based on the inorganic particulate, of a dispersant soluble in the liquid of component (C) selected from the group consisting of
- (i) phosphated block poly(alkylsiloxane)-poly(alkyleneether) alcohols;
- and
- (ii) aromatic- or alkylaromatic-terminated phosphated poly(alkyleneether) alcohols;
- and
- (C) a liquid selected from the group consisting of dimethylsulfoxide, tetramethylurea, and amides.
4 more elements
A process for preparing spandex comprising the steps of:
- (A) providing a dispersant slurry consisting essentially of
- (a) 10-78 wt %, based on the total weight of the dispersant slurry, of an inorganic particulate;
- (b) 2-50 wt %, based on the inorganic particulate, of a dispersant soluble in the liquid of component (c) selected from the group consisting of
- (i) phosphated block poly(alkylsiloxane)-poly(alkyleneether) alcohols;
- and
- (ii) aromatic- or alkylaromatic-terminated phosphated poly(alkyleneether) alcohols;
- and
- (c) a liquid selected from the group consisting of dimethylsulfoxide, tetramethylurea and amides;
- (B) milling the slurry until the particulate has a median particle size, based on volume distribution, of ≦5 microns;
- (C) adding the slurry to a solution of polyurethane in a spinning solvent to form a spinning solvent;
- and
- (D) spinning the spinning solution obtained in step (c) to form spandex.
9 more elements
Dependencies are inferred from the claim text.