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US 2006/0183852 A1Published application
Solvent free aqueous polyurethane dispersions and adhesive films therefrom for stretch fabrics
AssigneeINVISTA North America S.a r.I.
InventorsHong Liu, Carmen Covelli, Douglas Farmer
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Abstract
Novel aqueous polyurethane dispersions and adhesive films formed therefrom are provided. The aqueous polyurethane dispersions are provided in solvent-free systems of a prepolymer comprising at least one polyether or polyester polyol, a mixture of MDI isomers, and a diol. The adhesive films from such dispersions can be heat-activated for bonding, lamination, and adhesion of textile fabrics, including stretch fabrics.
Claims45
A prepolymer for use in an aqueous polyurethane dispersion comprising:
- a) at least one polyether or polyester polyol, wherein said polyether or polyester polyol has a number average molecular weight of about 600 to about 3,500;
- b) a mixture of 4,4′- and 2,4′-methylene bis(phenyl isocyanate) (MDI) isomers, wherein the ratio of 4,4′-MDI to 2,4′-MDI isomers ranges from about 65:35 to about 35:65;
- and
- c) at least one diol compound comprising:
- (i) hydroxy groups capable of reacting with the mixture of MDI isomers of component b), and (ii) at least one carboxylic acid group capable of forming a salt upon neutralization, wherein said at least one carboxylic acid group is incapable of reacting with the mixture of MDI isomers of component b);
- wherein the prepolymer is substantially solvent-free.
3 more elements
The prepolymer of claim 11, wherein the ratio of 4,4′-MDI to 2,4′-MDI isomers ranges from about 55:45 to about 45:55.
A process for making a prepolymer for use in an aqueous polyurethane dispersion, wherein the prepolymer comprises:
- a) at least one polyether or polyester polyol, wherein said polyether or polyester polyol has a number average molecular weight of about 600 to about 3,500;
- b) a mixture of 4,4′- and 2,4′-methylene bis(phenyl isocyanate) (MDI) isomers, wherein the ratio of 4,4′MDI to 2,4′-MDI isomers ranges from about 65:35 to about 35:65;
- and
- c) at least one diol compound comprising:
- (i) hydroxy groups capable of reacting with the mixture of MDI isomers of component b), and (ii) at least one carboxylic acid group capable of forming a salt upon neutralization, wherein said at least one carboxylic acid group is incapable of reacting with the mixture of MDI isomers of component b);
- and the process comprises combining components a), b), and c) in a substantially solvent-free system.
3 more elements
An aqueous polyurethane dispersion, comprising:
- a prepolymer, which comprises:
- a) at least one polyether or polyester polyol, wherein said polyether or polyester polyol has a number average molecular weight of about 600 to about 3,500;
- b) a mixture of 4,4′- and 2,4′-methylene bis(phenyl isocyanate) (MDI) isomers, wherein the ratio of 4,4′-MDI to 2,4′-MDI isomers ranges from about 65:35 to about 35:65;
- and
- c) at least one diol compound comprising:
- (i) hydroxy groups capable of reacting with the mixture of MDI isomers of component b) and (ii) at least one carboxylic acid group capable of forming a salt upon neutralization, wherein said at least one carboxylic acid group is incapable of reacting with the mixture of MDI isomers of component b);
- wherein the aqueous polyurethane dispersion is a substantially solvent-free system that further comprises:
- d) at least one neutralizing agent to form an ionic salt with the at least one diol compound;
- and
- e) at least one monofunctional dialkyl amine compound as a blocking agent for isocyanate groups.
7 more elements
A process for making an aqueous polyurethane dispersion, wherein the aqueous polyurethane dispersion comprises:
- a prepolymer, which comprises:
- a) at least one polyether or polyester polyol, wherein said polyether or polyester polyol has a number average molecular weight of about 600 to about 3,500;
- b) a mixture of 4,4′- and 2,4′-methylene bis(phenyl isocyanate) (MDI) isomers, wherein the ratio of 4,4′-MDI to 2,4′-MDI isomers ranges from about 65:35 to about 35:65;
- and
- c) at least one diol compound comprising:
- (i) hydroxy groups capable of reacting with the mixture of MDI isomers of component b) and (ii) at least one carboxylic acid group capable of forming a salt upon neutralization, wherein said at least one carboxylic acid group is incapable of reacting with the mixture of MDI isomers of component b);
- wherein the aqueous polyurethane dispersion is a substantially solvent-free system that further comprises:
- d) at least one neutralizing agent to form an ionic salt with the at least one diol compound;
- and
- e) at least one monofunctional dialkyl amine compound as a blocking agent for isocyanate groups;
- and where the process comprises dispersing the prepolymer in an aqueous medium, wherein the at least one neutralizing agent is added to either the prepolymer or aqueous medium prior to dispersing the prepolymer in the aqueous medium and the at least one blocking agent is added to the aqueous medium either during or after dispersing the prepolymer in the aqueous medium.
8 more elements
An adhesive film or tape, comprising:
- a substantially solvent-free aqueous polyurethane dispersion of:
- (1) a prepolymer, which comprises:
- a) at least one polyether or polyester polyol, wherein said polyether or polyester polyol has a number average molecular weight of about 600 to about 3,500;
- b) a mixture of 4,4′- and 2,4′-methylene bis(phenyl isocyanate) (MDI) isomers, wherein the ratio of 4,4″-MDI to 2,4′-MDI isomers ranges from about 65:35 to about 35:65;
- and
- c) at least one diol compound comprising:
- (i) hydroxy groups capable of reacting with the mixture of MDI isomers of component b) and (ii) at least one carboxylic acid group capable of forming a salt upon neutralization, wherein said at least one carboxylic acid group is incapable of reacting with the mixture of MDI isomers of component b);
- (2) at least one neutralizing agent to form an ionic salt with the at least one diol compound;
- and
- (3) at least one monofunctional dialkyl amine compound as a blocking agent for isocyanate groups.
7 more elements
A stretch article comprising:
- at least one adhesive film or tape of:
- a substantially solvent-free aqueous polyurethane dispersion of:
- (1) a prepolymer, which comprises:
- a) at least one polyether or polyester polyol, wherein said polyether or polyester polyol has a number average molecular weight of about 600 to about 3,500;
- b) a mixture of 4,4′- and 2,4′-methylene bis(phenyl isocyanate) (MDI) isomers, wherein the ratio of 4,4′-MDI to 2,4′-MDI isomers ranges from about 65:35 to about 35:65;
- and
- c). at least one diol compound comprising:
- hydroxy groups capable of reacting with the mixture of MDI isomers of component b) and at least one carboxylic acid group capable of forming a salt upon neutralization, wherein said at least one carboxylic acid group is incapable of reacting with the mixture of MDI isomers of component b);
- (2) at least one neutralizing agent to form an ionic salt with the at least one diol compound;
- and
- (3) at least one monofunctional dialkyl amine compound as a blocking agent for isocyanate groups;
- and a substrate to which said adhesive film or tape is applied.
9 more elements
The stretch article according to wherein the garment is selected from the group consisting of undergarments, brassieres, panties, lingerie, swimwear, shpares, camisoles, hosiery, sleepwear, aprons, wetsuits, ties, scrubs, space suits, uniforms, hats, garters, sweatbands, belts, activewear, outerwear, rainwear, cold-weather jackets, pants, shirtings, dresses, blouses, mens and womens tops, and sweaters.
Dependencies are inferred from the claim text.