초록 ▼

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

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.

대표청구항 ▼

We claim: 1. A mine opening lined with a liner comprising the product of reaction of: (a) a hydrophilic prepolymer bearing isocyanate groups that are capable of reacting with water to form a gelled mass; and (b) a water-borne polymer dispersion, said polymer bearing groups that are reactive to said

We claim: 1. A mine opening lined with a liner comprising the product of reaction of: (a) a hydrophilic prepolymer bearing isocyanate groups that are capable of reacting with water to form a gelled mass; and (b) a water-borne polymer dispersion, said polymer bearing groups that are reactive to said isocyanate groups. 2. A mine opening lined with a liner comprising the product of reaction of: (a) a hydrophilic prepolymer bearing isocyanate groups that are capable of reacting with water to form a gelled mass; 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. 3. A mine opening lined with 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. 4. A mine opening lined with a liner comprising the product of reaction of: (a) a hydrophilic prepolymer bearing isocyanate groups that are capable of reacting with water to form a gelled mass; 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. 5. A kit for producing a liner, said kit comprising (a) a hydrophilic prepolymer bearing isocyanate groups that are capable of reacting with water to form a gelled mass; 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. 6. A kit according to claim 5, wherein said polymer used in component (b) has a molecular weight in the range of at least about 50,000. 7. A kit according to claim 5, wherein said polymer of component (b) is in the form of particles of a size from about 10 to about 10,000 nm. 8. A kit according to claim 5, wherein said dispersion has a solids content of at least about 30 percent by weight, based upon the total weight of said dispersion. 9. A kit according to claim 5, 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. 10. A kit according to claim 5, wherein a film prepared from said polymer used in component (b) has a value of Tg or Tm greater than about 30째 C. 11. A kit according to claim 5, wherein said dispersion contains no co-solvent. 12. A kit according to claim 5, wherein said liner exhibits a 4-hour Tensile Strength of at least about 1 MPa. 13. A kit according to claim 5, 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. 14. A kit according to claim 5, wherein said polymer dispersion is selected from the group consisting of polyurethane dispersions and poly(styrene-acrylic) dispersions. 15. A kit according to claim 14, wherein said polymer dispersion is a polyurethane dispersion. 16. A kit according to claim 15, wherein said polyurethane dispersion is a polyurethane-polyacrylic dispersion. 17. A kit according to claim 5, wherein said polymer dispersion is in admixture with a dispersion of an acrylic polymer, a styrene-butadiene copolymer, or a vinyl acetate polymer. 18. A kit according to claim 5, wherein the weight ratio of component (a) to component (b) is in the range of about 1:3 to about 1:10. 19. The kit of claim 5, wherein said liner has a thickness in the range of from about 0.5 mm to about 6 mm. 20. The kit of claim 5, wherein said prepolymer is derived from at least one polyether polyol. 21. The kit of claim 20, wherein said polyether polyol is trifunctional. 22. The kit of claim 5, wherein said groups that are reactive to said isocyanate groups are amino groups. 23. 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. 24. A kit according to claim 23, wherein said kit further comprises expandable graphite. 25. A kit according to claim 23, wherein said prepolymer is derived from at least one polyether polyol and said isocyanate groups are derived from at least one aromatic polyisocyanate. 26. A kit according to claim 23, wherein said dispersion is a polyurethane-polyacrylic dispersion. 27. A kit for producing a liner, said kit comprising (a) a hydrophilic prepolymer bearing isocyanate groups that are capable of reacting with water to form a gelled mass; 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. 28. A kit for producing a liner, said kit comprising (a) a hydrophilic prepolymer bearing isocyanate groups that are capable of reacting with water to form a gelled mass; 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.