Hydrophilic polyurethanes and their application as soil-release, anti-soil redeposition, and anti-static agents for textile substrates
AssigneeRhone-Poulenc Industries
InventorsRobert Violland, Alain Lagasse
Life of this patent
Estimating the term…
Abstract
Novel linear hydrophilic polyurethane polymers are presented. The polymers provide outstanding soil-release, anti-soil redeposition and anti-static properties when applied to natural and synthetic textile substrates, especially textile substrates containing polyester fibers. These polyurethanes are particularly useful in detergent compositions.
Claims90
A linear, hydrophilic polyurethane having a relative viscosity of at least about 2, said polyurethane comprising the reaction product of:
- (a) from 10 to 70 weight percent of a polyester having a hydroxyl number of less than 120 mg KOH/g and an acid number of not more than 3 mg KOH/g, said polyester being the condensation product of an aromatic dicarboxylic acid or ester-forming derivative thereof with a diol having a molecular weight not in excess of about 300;
- and
- (b) from 30 to 90 weight percent of an isocyanato prepolymer having NCO terminal groups, said prepolymer being the reaction product of a nonionic hydrophilic macrodiol having a molecular weight of from about 300 to about 6,000 with a diisocyanate;
- and
- (c) wherein the overall ratio of NCO/OH groups ranges from between about 0.8 and 1.
A linear, hydrophilic polyurethane having a relative viscosity of at least about 2, said polyurethane comprising the reaction product of:
- (a) from 10 to 70 weight percent of a polyester having a hydroxyl number of less than 120 mg KOH/g and an acid number of not more than 3 mg KOH/g, said polyester being the condensation product of a dicarboxylic acid or ester-forming derivative thereof with a diol having a molecular weight not in excess of about 300;
- and
- (b) from 30 to 90 weight percent of an isocyanato prepolymer having NCO terminal groups, said prepolymer being the reaction product of a nonionic hydrophilic polyethylene glycol having a molecular weight of from about 300 to about 6,000 with a diisocyanate;
- and
- (c) wherein the overall ratio of NCO/OH groups ranges from between about 0.8 and 1.
A detergent composition comprising (i) a surfactant and (ii) from about 0.1 to 5 weight percent of a linear, hydrophilic polyurethane having a relative viscosity of at least about 2, said polyurethane comprising the reaction product of:
- (a) from 10 to 20 weight percent of a polyester having a hydroxyl number of less than 120 mg KOH/g and an acid number of not more than 3 mg KOH/g, said polyester being the condensation product of a dicarboxylic acid or ester-forming derivative thereof with a diol;
- (b) from 30 to 90 weight percent of an isocyanato prepolymer having NCO terminal groups, said prepolymer being the reaction product of a nonionic hydrophilic macrodiol with a diisocyanate;
- and
- (c) wherein the overall ratio of NCO/OH groups ranges from between about 0.8 and 1.
A dilute, aqueous dispersion of (i) water and (ii) from 0.001 to 20 weight percent of a linear, hydrophilic polyurethane having a relative viscosity of at least about 2, said polyurethane comprising the reaction product of:
- (a) from 10 to 70 weight percent of a polyester having a hydroxyl number of less than 120 mg KOH/g and an acid number of not more than 3 mg KOH/g, said polyester being the condensation product of a dicarboxylic acid or ester-forming derivative thereof with a diol;
- (b) from 30 to 90 weight percent of an isocyanato prepolymer having NCO terminal groups, said prepolymer being the reaction product of a nonionic hydrophilic macrodiol with a diisocyanate;
- and
- (c) wherein the overall ratio of NCO/OH groups ranges from between about 0.8 and 1.
A fibrous textile substrate comprising a plurality of individual fibers, each of said fibers having sorbed thereon a soil-releasing amount of a linear, hydrophilic polyurethane having a relative viscosity of at least about 2, said polyurethane comprising the reaction product of:
- (a) from 10 to 70 weight percent of a polyester having a hydroxyl number of less than 120 mg KOH/g and an acid number of not more than 3 mg KOH/g, said polyester being the condensation product of a dicarboxylic acid or ester-forming derivative thereof with a diol;
- (b) from 30 to 90 weight percent of an isocyanato prepolymer having NCO terminal groups, said prepolymer being the reaction product of a nonionic hydrophilic macrodiol with a diisocyanate;
- and
- (c) wherein the overall ratio of NCO/OH groups ranges from between about 0.8 and 1.
A method of treating fiber-containing materials to impart soil-resistance, anti-soil redeposition and anti-static characteristics thereto, which comprises washing said materials with water, in the presence of an amount sufficient to impart said characteristics of a linear, hydrophilic polyurethane having a relative viscosity of at least about 2, said polyurethane comprising the reaction product of:
- (a) from 10 to 70 weight percent of a polyester having a hydroxyl number of less than 120 mg KOH/g and an acid number of not more than 3 mg KOH/g, said polyester being the condensation product of a dicarboxylic acid or ester-forming derivative thereof with a diol;
- (b) from 30 to 90 weight percent of an isocyanato prepolymer having NCO terminal groups, said prepolymer being the reaction product of a nonionic hydrophilic macrodiol with a diisocyanate;
- and
- (c) wherein the overall ratio of NCO/OH groups ranges from between about 0.8 and 1.
A composition of matter which comprises a powder, said powder comprising from 10 to 90 weight percent of a mineral filler, and 90 to 10 weight percent of a linear, hydrophilic polyurethane having a relative viscosity of at least about 2, said polyurethane comprising the reaction product of:
- (a) from 10 to 70 weight percent of a polyester having a hydroxyl number of less than 120 mg KOH/g and an acid number of not more than 3 mg KOH/g, said polyester being the condensation product of a dicarboxylic acid or ester-forming derivative thereof with a diol;
- (b) from 30 to 90 weight percent of an isocyanato prepolymer having NCO terminal groups, said prepolymer being the reaction product of a nonionic hydrophilic macrodiol with a diisocyanate;
- and
- (c) wherein the overall ratio of NCO/OH groups ranges from between about 0.8 and 1.
Dependencies are inferred from the claim text.