Low energy surface bonding system containing a primer with long open time
First Claim
1. A composition comprisinga) one or more prepolymers having on average three or more aliphatic isocyanate groups and further containing alkoxysilane groups;
- b) one or more aromatic polyisocyanates;
c) one or more compounds having at least one heterocyclic ring which hydrolyzes when exposed to moisture to form at least one isocyanate reactive group;
d) one or more solvents;
e) one or more amine or organometallic polyurethane catalysts;
wherein the ratio of aromatic isocyanate groups to aliphatic isocyanate groups is from about 0.5;
1.0 to about 1.5;
1.0 and the equivalent ratio of isocyanate groups to isocyanate reactive groups derivable from the one or more compounds having at least one hydrolyzable heterocylic ring is from about 0.8;
1.0 to about 5.3;
1.0.
3 Assignments
0 Petitions
Accused Products
Abstract
The invention is a composition comprising
a) one or more prepolymers having on average three or more aliphatic isocyanate groups and further containing alkoxysilane groups; b) one or more aromatic polyisocyanates; c) one or more compounds having at least one heterocyclic ring which hydrolyzes when exposed to moisture to form at least one isocyanate reactive group; d) one or more solvents; and e) one or more amine and/or organometallic polyurethane catalysts; wherein the ratio of aromatic isocyanate groups to aliphatic isocyanate groups in the composition is from about 0.5:1.0 to about 1.5:1.0, preferably about 0.9:1.0 to about 1.5:1.0, and the equivalent ratio of isocyanate groups to isocyanate reactive groups derivable from the one or more compounds having at least one hydrolyzable heterocylic ring is from about 0.8:1.0 to about 5.3:1.0, and most preferably about 1.5:1.0 to about 1.7:1.0.
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Citations
20 Claims
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1. A composition comprising
a) one or more prepolymers having on average three or more aliphatic isocyanate groups and further containing alkoxysilane groups; -
b) one or more aromatic polyisocyanates; c) one or more compounds having at least one heterocyclic ring which hydrolyzes when exposed to moisture to form at least one isocyanate reactive group; d) one or more solvents; e) one or more amine or organometallic polyurethane catalysts; wherein the ratio of aromatic isocyanate groups to aliphatic isocyanate groups is from about 0.5;
1.0 to about 1.5;
1.0 and the equivalent ratio of isocyanate groups to isocyanate reactive groups derivable from the one or more compounds having at least one hydrolyzable heterocylic ring is from about 0.8;
1.0 to about 5.3;
1.0.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
b) from about 1 to about 30 percent by weight of one or more aromatic polyisocyanates; c) from about 1 to about 10 percent by weight of one or more compounds having at least one heterocyclic ring which hydrolyzes when exposed to moisture to form at least one isocyanate reactive group; d) from about 35 to about 85 percent by weight of one or more solvents; e) from about 1 to about 5 percent by weight of one or more amine or organometallic polyurethane catalysts; f) from about 0 to about 8 percent by weight of one or more film forming resins; g) from about 0 to about 20 percent by weight of one or more pigments; wherein the percentages are based on the total weight of the composition.
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13. A composition according to claim 12 wherein component b) comprises i) from about 3 to about 15 percent by weight of i) one or more comprises one or more of polyisocyanates or polymeric polyisocyanates and from about 1 to about 7 percent by weight of ii) one or more adducts of polyisocyanates with compounds having two or more isocyanate reactive groups which further contain alkoxysilane groups.
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14. A system for bonding two substrates together which comprises a composition according to claim 1 and an adhesive having one or more functional groups selected from acrylic, methacrylic, isocyanate, siloxy or mixtures thereof.
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15. A method of priming a surface to enhance the bond of a polyisocyanate functional adhesive to the surface which comprises contacting a composition according to claim 1 with the surface and allowing the solvent to evaporate.
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16. A method of bonding two substrates together which comprises
a) applying a composition according to claim 1 to the surface of one or more of the substrates and allowing the solvent to evaporate away; -
b) applying an isocyanate functional adhesive to the surfaces of the two or more substrates to which the composition was applied according to step a); c) contacting the two or more substrates together with the adhesive disposed between the substrates; and d) allowing the adhesive to cure so as to bond the two or more substrates together.
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17. A method according to claim 16 wherein the time between the application of the primer and application of the adhesive is from about 20 second to about 1 year.
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18. A method according to claim 17 wherein after step a) one or more of the substrates are moved to another location for performance of step b).
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19. An article comprising a substrate having deposited thereon the composition of claim 1.
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20. An article comprising a substrate having deposited thereon the composition of claim 1 without the solvent.
Specification