Polyurethaneurea composition
AssigneeMinnesota Mining and Manufacturing Company
InventorsThomas S. Reid, Charles D. Wright
Life of this patent
Estimating the term…
Abstract
A substantially solvent-free two-part polyurethaneurea composition having excellent adhesion to elastomeric substrates, comprising the reaction product of a macrodiol endcapped with an oligomeric aromatic amine and a polyisocyanate or prepolymer. With selected compositions, curing can be effected in moist conditions, or even under water. The composition provides an excellent sealant or repair for elastomeric/rubberized articles such as waders, etc.
Claims25
A flexible, elastomeric substrate adherent, polyurethaneurea formed from the reaction of
- (a) a macrodiol derived or macro-diamine derived amine, contained in a room temperature liquid first component, and
- (b) a polyisocyanate prepolymer alone, or in combination with, a polyisocyanate contained in a room temperature liquid second component;
- wherein at least one urethane linkage is present in said first or second component, the equivalents of isocyanate per equivalent of amine is between about 0.9 and about 2.6, said amine of said first component and said prepolymer or prepolymer/polyisocyanate of said second component providing a reaction mixture capable of curing at room temperature.
A flexible, elastomeric substrate adherent polyurethaneurea formed from the reaction of
- (a) a oligomeric aromatic polyamine;
- and
- (b) a polyisocyanate terminated urethane prepolymer alone, or in combination with, a polyisocyanate,
- wherein at least one of said polyamine and said prepolymer or prepolymer/polyisocyanate contain at least one urethane linkage and are present in ratios to provide upon reacting (a) and (b) a cured polyurethaneurea.
A method for sealing an aperture in a polymeric elastomeric material comprising:
- (a) applying a room temperature curable composition over said aperture and onto adjacent surface of said polymeric elastomeric material, said composition comprising:
- (1) an oligomeric aromatic polyamine, and
- (2) a polyisocyanate terminated urethane prepolymer alone or in combination with a polyisocyanate
- wherein at least one of said polyamine, polyisocyanate, or prepolymer contain at least one urethane linkage and are present in ratios to provide upon reaction of (1) and (2) a cured polyurethaneurea polymer capable of sealing said polymeric elastomeric material, and
- (b) curing said composition to seal said aperture.
A method for sealing an aperture in a polymeric elastomeric material comprising:
- (a) applying a room temperature curable composition to locations on said patch and said polymeric elastomeric material to bond said patch to said elastomeric material in sealing relationship to said aperture, said curable composition comprising:
- (1) an oligomeric aromatic polyamine, and
- (2) a polyisocyanate terminated urethane prepolymer alone or in combination with a polyisocyanate,
- wherein at least one of said polyamine, polyisocyanate, or prepolymer contain at least one urethane linkage and are present in ratios to provide upon reaction of (1) and (2) a cured polyurethaneurea polymer capable of bonding said patch to said polymeric elastomeric material, and
- (b) curing said composition to provide a patched seal over said aperture.
An article comprising a polymeric elastomeric surface bearing a sealant composition, said sealant composition comprising a cured polyurethaneurea polymer formed from a reaction of (1) an oligomeric aromatic polyamine and (2) a polyisocyanate terminated urethane prepolymer alone or in combination with a polyisocyanate wherein at least one of said reactants contains at least one urethane linkage.
A method for making an article having at least a portion of its surface composed of a polymeric elastomeric material having a sealed aperture therein comprising:
- (a) applying a curable composition over said aperture onto adjoining polymeric, elastomeric material, said composition comprising:
- (1) an oligomeric aromatic polyamine, and
- (2) a polyisocyanate terminated urethane prepolymer alone or in combination with a polyisocyanate,
- wherein at least one of said polyamine, polyisocyanate or prepolymer contain at least one urethane linkage and are present in ratios to provide upon reaction of (1) and (2) a cured polyurethaneurea polymer capable of sealing said aperture, and
- (b) curing said composition to seal said aperture.
A kit comprising first and second parts in unreactable combination, said first part comprising
- (a) a oligomeric aromatic polyamine;
- and said second part comprising:
- (b) a polyisocyanate terminated urethane prepolymer alone or in combination with a polyisocyanate;
- wherein at least one of said polyamine, polyisocyanate, or prepolymer contain at least one urethane linkage and are present in ratios to provide upon mixing and reacting said first and second parts a cured polyurethaneurea polymer sealant for polymeric elastomeric materials.
Dependencies are inferred from the claim text.