Dry-to-the-touch-moisture-curable compositions and products made therefrom
View Patent ↗A dry-to-the-touch moisture curing composition useful as a sealant and adhesive which includes a reactive modified methylene diisocyanate polymer component having isocyanate functionality of about 8% to about 18% by weight of the polymer.
1. A method of curing mated threaded parts comprising:
(a) providing a composition comprising:
(i) a moisture curable modified methylene diisocyanate (MDI) polymer having a residual NCO content of about 8% to 18% by weight of the polymer;
(ii) a moisture curable catalyst; and
(iii) a reinforcement filler;
(b) applying the composition to a threaded part;
(c) mating the threaded part with another threaded part; and
(d) permitting the composition to moisture cure.
2. The method of claim 1 , wherein the moisture curable polymer has an NCO content of about 16% to about 18% by weight.
3. The method of claim 1 , wherein the moisture curable polymer is a polyester modified MDI.
4. The method of claim 1 , wherein the moisture curable polymer is a polyether modified MDI.
5. The method of claim 1 , wherein the moisture curable polymer is present in amounts of about 30% to about 95% by weight of the total composition.
6. The method of claim 1 , wherein the break/prevail values after 48 hour room temperature cure are at least 90/10 in-lb.
7. The method of claim 1 , wherein the composition is dry-to-the-touch at an area of the mated thread parts exposed to air.
8. The method of claim 1 , wherein the composition has a viscosity of about 1000 to about 4000 cps at room temperature.
9. A moisture curable threadlocking composition comprising:
(a) a polyester or polyether polymer having a residual NCO content of about 16% to about 18% by weight of the polymer;
(b) a moisture cure catalyst; and
(c) a reinforcement filler;
wherein the composition provides a break/prevail strength of 100/10 in-lb after 4 to 8 hours of cure at 120° C.
10. The composition of claim 9 , wherein the break/prevail strength of at least 100/10 is obtained after 24room temperature cure.
11. The composition of claim 9 , wherein the polymer is present in amounts of about 30% to about 95% by weight of the total polymer.
12. The composition of claim 9 , wherein the polymer has a viscosity in the range of about 1000 to about 3000 cps at room temperature.
13. A threaded assembly comprising:
(a) a male threaded part matingly assembly with a female threaded part;
(b) a threadlocking composition comprising:
(i) a moisture curable modified methylene diisocyanate prepolymer having a residual NCO content of about 8% to about 18% by weight of the polymer;
(ii) a moisture curable catalyst; and
(iii) a reinforcement filler.