Continuous preparation of polyurethanes or polyureas

A method for preparing a thickening composition, the method comprising:

• continuously preparing a hydrophilic polymer (P), having a Mw in a range of from 60,000 to 500,000 g/mol, by a reactive extrusion of precursors comprising a water-soluble polyalkylene glycol (A), in at least 69.44 wt. %, and a product (B), in a range of from 9.513 to 30.56 wt. %, relative to a total weight of the precursors;
• and
• mixing the hydrophilic polymer (P) in a medium comprising a solvent,
• wherein the water-soluble polyalkylene glycol (A) comprises a polyethylene glycol, a polyethylene glycol-polypropylene glycol copolymer comprising at most 40% by weight of polypropylene glycol, and/or a polyethylene glycol-polybutylene glycol copolymer comprising at most 20% by weight of polybutylene glycol,
• wherein the water-soluble polyalkylene glycol (A) has a weight-average molecular mass (Mw) in a range of from 1,000 to 40,000 g/mol,
• wherein the product (B) comprises an associative group and a monoisocyanate group,
• wherein the product (B) comprises:
• (b) a combination of a diisocyanate (B3) and a compound (B2) of formula (II):
• R′—(BO)n—(PO)m—(BO)p—X (II),
• R′ being a straight, branched, or cyclic, saturated, unsaturated, or aromatic hydrocarbon group comprising from 6 to 40 carbon atoms, (EO) being an ethoxylene group, (PO) being a propoxylene group, (BO) being a butoxylene group, n, m, and p independently being a real number in a range of from 0 to 150, a sum of n, m, and p being a real number in a range of from 0 to 150, and X being an amine group;
• and/or
• (c) a product resulting from a prior condensation of the diisocyanate (B3) and the compound (B2) of formula (II).

A method for preparing a thickening composition, the method comprising:

• continuously preparing a hydrophilic polymer (P), having a Mw in a range of from 60,000 to 500,000 g/mol, by a reactive extrusion of precursors comprising a water-soluble polyalkylene glycol (A), in at least 55 wt. %, and a product (B), in a range of from 9.513 to 45 wt. %, relative to a total weight of the precursors;
• and
• mixing the hydrophilic polymer (P) in a medium comprising a solvent and further comprising,
• wherein the water-soluble polyalkylene glycol (A) comprises a polyethylene glycol, a polyethylene glycol-polypropylene glycol copolymer comprising at most 40% by weight of polypropylene glycol, and/or a polyethylene glycol-polybutylene glycol copolymer comprising at most 20% by weight of polybutylene glycol,
• wherein the water-soluble polyalkylene glycol (A) comprises a polyethylene glycol,
• wherein the water-soluble polyalkylene glycol (A) has a weight-average molecular mass (Mw) in a range of from 1,000 to 40,000 g/mol,
• wherein the product (B) comprises an associative group and a monoisocyanate group,
• wherein the product (B) comprises:
• (b) a combination of a diisocyanate (B3) and a compound (B2) of formula (II):
• R″-(EO)n—(PO)m—X (II),
• R″ being a hydrocarbon group of formula C15H31-x where x is 0, 2, 4, or 6, (EO) being an ethoxylene group, (PO) being a propoxylene group, n, m, and p independently being a real number in a range of from 0 to 150, a sum of n, m, and p being a real number in a range of from 4 to 150, and X being a chemical group carrying a labile hydrogen suitable to react with an isocyanate group to form the monoisocyanate in the reactive extrusion;
• and/or
• (c) a product resulting from a prior condensation of the diisocyanate (B3) and the compound (B2) of formula (II).