Sprayable mining liner
Assignee3M Innovative Properties Company
InventorsAshok Sengupta, Jiangdong Tong
Life of this patent
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Abstract
A liner is the product of reaction of (a) a hydrophilic prepolymer bearing isocyanate groups; and (b) a water-borne polymer dispersion, the polymer bearing groups that are reactive to isocyanate groups; wherein the dispersion has a sufficiently high solids content, and the polymer has a sufficiently high modulus and glass transition or crystalline melting temperature, that the product of reaction exhibits a 24-hour Tensile Strength of at least about 2.5 MPa.
Claims63
A liner comprising the product of reaction of:
- (a) a hydrophilic prepolymer bearing isocyanate groups;
- and
- (b) a water-borne polymer dispersion, said polymer bearing groups that are reactive to said isocyanate groups;
- wherein said dispersion has a sufficiently high solids content, and said polymer has a sufficiently high modulus and glass transition or crystalline melting temperature, that said product of reaction exhibits a 24-hour Tensile Strength of at least about 2.5 MPa.
A liner according to claim 1 or claim 20, wherein said polymer used in component (b) has a molecular weight in the range of at least about 50,000.
A liner according to claim 1 or claim 20, wherein said polymer of component (b) is in the form of particles of a size from about 10 to about 10,000 nm.
A liner according to claim 1 or claim 20, wherein said dispersion has a solids content of at least about 30 percent by weight, based upon the total weight of said dispersion.
A liner according to claim 1 or claim 20, wherein a film prepared from said polymer used in component (b) has a tensile modulus of at least about 6.89 MPa at 100% elongation.
A liner according to claim 1 or claim 20, wherein a film prepared from said polymer used in component (b) has a value of Tg or Tm greater than about 30° C.
A liner according to claim 1 or claim 20, wherein said dispersion contains no co-solvent.
A liner according to claim 1 or claim 20, wherein said prepolymer is formed by reacting a polymer bearing hydroxyl groups with a monomeric polyisocyanate to form a urethane-containing polymer bearing isocyanate groups, which is purified by removing unreacted monomeric polyisocyanate or by quenching unreacted monomeric polyisocyanate with a compound that is reactive to isocyanate groups.
A liner according to claim 1 or claim 20, wherein said polymer dispersion is selected from the group consisting of polyurethane dispersions and poly(styrene-acrylic) dispersions.
A liner according to claim 1 or claim 20, wherein said polymer dispersion is in admixture with a dispersion of an acrylic polymer, a styrene-butadiene copolymer, or a vinyl acetate polymer.
A liner according to claim 1 or claim 20, wherein the weight ratio of component (a) to component (b) is in the range of about 1:3 to about 1:10.
A liner comprising the product of reaction of:
- (a) a hydrophilic prepolymer bearing isocyanate groups;
- and
- (b) a water-borne polyurethane-polyacrylic or poly(styrene-acrylic) dispersion, said polyurethane-polyacrylic or poly(styrene-acrylic) bearing groups that are reactive to said isocyanate groups.
A liner comprising the product of reaction of:
- (a) a hydrophilic prepolymer bearing isocyanate groups;
- and
- (b) a water-borne polymer dispersion, said polymer bearing groups that are reactive to said isocyanate groups;
- wherein said dispersion has a water content no greater than about 80 percent by weight, based upon the total weight of said dispersion.
A liner comprising the product of reaction of:
- (a) a hydrophilic prepolymer bearing isocyanate groups;
- and
- (b) a water-borne polymer dispersion, said polymer bearing groups that are reactive to said isocyanate groups;
- wherein said dispersion has a sufficiently high solids content, and said polymer has a sufficiently high modulus and glass transition or crystalline melting temperature, that said product of reaction exhibits a 4-hour Tensile Strength of at least about 1 MPa.
A method for providing a surface with a liner, said method comprising
- (a) applying to said surface
- (1) a hydrophilic prepolymer bearing isocyanate groups, and
- (2) a water-borne polymer dispersion, said polymer bearing groups that are reactive to said isocyanate groups;
- and
- (b) allowing said components (1) and (2) to react to form said liner;
- wherein said dispersion has a sufficiently high solids content, and said polymer has a sufficiently high modulus and glass transition or crystalline melting temperature, that said liner exhibits a 24-hour Tensile Strength of at least about 2.5 MPa.
A method according to claim 21 or claim 43, wherein said polymer used in component (2) has a molecular weight in the range of at least about 50,000.
A method according to claim 21 or claim 43, wherein said polymer of component (2) is in the form of particles of a size from about 10 to about 10,000 nm.
A method according to claim 21 or claim 43, wherein said dispersion has a solids content of at least about 30 percent by weight, based upon the total weight of the dispersion.
A method according to claim 21 or claim 43, wherein a film prepared from said polymer of component (2) has a tensile modulus of at least about 6.89 MPa at 100% elongation.
A method according to claim 21 or claim 43, wherein a film prepared from said polymer of component (2) has a value of Tg or Tm greater than about 30° C.
A method according to claim 21 or claim 43, wherein said dispersion contains no co-solvent.
A method according to claim 21 or claim 43, wherein said prepolymer (a) is formed by reacting a polymer bearing hydroxyl groups with a monomeric polyisocyanate to form a urethane-containing polymer bearing isocyanate groups, which is purified by removing unreacted monomeric polyisocyanate or by quenching unreacted monomeric polyisocyanate with a compound that is reactive to isocyanate groups.
A method according to claim 21 or claim 43, wherein said polymer dispersion is selected from the group consisting of polyurethane dispersions and poly(styrene-acrylic) dispersions.
A method according to claim 21 or claim 43, wherein said polymer dispersion (2) is in admixture with a dispersion of an acrylic polymer, a styrene-butadiene copolymer, or a vinyl acetate polymer.
A method according to claim 21 or claim 43, wherein the weight ratio of component (1) to component (2) is in the range of from about 1:3 to about 1:10.
A method according to claim 21 or claim 43, wherein the thickness of said liner is in the range of from about 0.5 mm to about 6 mm.
A method according to claim 21 or claim 43, wherein said surface is in a mine opening.
A method for providing a surface with a liner, said method comprising
- (a) applying to said surface
- (1) a hydrophilic prepolymer bearing isocyanate groups;
- and
- (2) a water-borne polyurethane-polyacrylic or poly(styrene-acrylic) dispersion, said polyurethane-polyacrylic or poly(styrene-acrylic) bearing groups that are reactive to said isocyanate groups;
- and
- (b) allowing said components (1) and (2) to react to form said liner.
A method for providing a surface with a liner, said method comprising
- (a) applying to said surface
- (1) a hydrophilic prepolymer bearing isocyanate groups;
- and
- (2) a water-borne polymer dispersion, said polymer bearing groups that are reactive to said isocyanate groups;
- and
- (b) allowing said components (1) and (2) to react to form said liner;
- wherein said dispersion has a water content no greater than about 80 percent by weight, based upon the total weight of said dispersion.
A method for providing a surface with a liner, said method comprising
- (a) applying to said surface
- (1) a hydrophilic prepolymer bearing isocyanate groups, and
- (2) a water-borne polymer dispersion, said polymer bearing groups that are reactive to said isocyanate groups;
- and
- (b) allowing said components (1) and (2) to react to form said liner;
- wherein said dispersion has a sufficiently high solids content, and said polymer has a sufficiently high modulus and glass transition or crystalline melting temperature, that said liner exhibits a 4-hour Tensile Strength of at least about 1 MPa.
A kit for producing a liner, said kit comprising
- (a) a hydrophilic prepolymer bearing isocyanate groups;
- and
- (b) a water-borne polymer dispersion which when combined with said component (a) reacts to form a liner, said polymer bearing groups that are reactive to said isocyanate groups;
- wherein said dispersion has a sufficiently high solids content, and said polymer has a sufficiently high modulus and glass transition or crystalline melting temperature, that said liner exhibits a 24-hour Tensile Strength of at least about 2.5 MPa.
A kit according to claim 44 or claim 63, wherein said polymer used in component (b) has a molecular weight in the range of at least about 50,000.
A kit according to claim 44 or claim 63, wherein said polymer of component (b) is in the form of particles of a size from about 10 to about 10,000 nm.
A kit according to claim 44 or claim 63, wherein said dispersion has a solids content of at least about 30 percent by weight, based upon the total weight of said dispersion.
A kit according to claim 44 or claim 63, wherein a film prepared from said polymer used in component (b) has a tensile modulus of at least about 6.89 MPa at 100% elongation.
A kit according to claim 44 or claim 63, wherein a film prepared from said polymer used in component (b) has a value of Tg or Tm greater than about 30° C.
A kit according to claim 44 or claim 63, wherein said dispersion contains no co-solvent.
A kit according to claim 44 or claim 63, wherein said prepolymer is formed by reacting a polymer bearing hydroxyl groups with a monomeric polyisocyanate to form a urethane-containing polymer bearing isocyanate groups, which is purified by removing unreacted monomeric polyisocyanate or by quenching unreacted monomeric polyisocyanate with a compound that is reactive to isocyanate groups.
A kit according to claim 44 or claim 63, wherein said polymer dispersion is selected from the group consisting of polyurethane dispersions and poly(styrene-acrylic) dispersions.
A kit according to claim 44 or claim 63, wherein said polymer dispersion is in admixture with a dispersion of an acrylic polymer, a styrene-butadiene copolymer, or a vinyl acetate polymer.
A kit according to claim 44 or claim 63, wherein the weight ratio of component (a) to component (b) is in the range of about 1:3 to about 1:
- 10.
A kit for producing a liner, said kit comprising
- (a) a hydrophilic prepolymer bearing isocyanate groups;
- and
- (b) a water-borne polyurethane-polyacrylic or poly(styrene-acrylic) dispersion
- which when combined with said component (a) reacts to form a liner, said polyurethane-polyacrylic or poly(styrene-acrylic) bearing groups that are reactive to said isocyanate groups.
A kit for producing a liner, said kit comprising
- (a) a hydrophilic prepolymer bearing isocyanate groups;
- and
- (b) a water-borne polymer dispersion which when combined with said component (a) reacts to form a liner, said polymer bearing groups that are reactive to said isocyanate groups;
- wherein said dispersion has a water content no greater than about 80 percent by weight, based upon the total weight of said dispersion.
A kit for producing a liner, said kit comprising
- (a) a hydrophilic prepolymer bearing isocyanate groups;
- and
- (b) a water-borne polymer dispersion which when combined with said component (a) reacts to form a liner, said polymer bearing groups that are reactive to said isocyanate groups;
- wherein said dispersion has a sufficiently high solids content, and said polymer has a sufficiently high modulus and glass transition or crystalline melting temperature, that said liner exhibits a 4-hour Tensile Strength of at least about 1 MPa.
Dependencies are inferred from the claim text.