Hot melt moisture cure adhesive compositions
View Patent ↗An adhesive composition that includes: one or more polyester polyether copolymers of formula I: wherein Nu is a predominately cyclic nucleus and RI is randomly selected from either a C 2-6 alkylene or an amorphous, long-chain polyether subunit including a polyoxyalkylene group; one or more polyisocyanate prepolymers that includes the reaction product of: one or more polyols; and a polyfunctional isocyanate having a functionality of more than about 2; polymeric MDI; and a first aromatic or aromatic-aliphatic polymer tackifying resin having a softening point of equal to or greater than about 100° C.
1. An adhesive composition comprising:
(a) one or more polyester polyether copolymers of formula I:
wherein Nu is a predominately cyclic nucleus and R 1 is randomly selected from either a C 2-6 alkylene or an amorphous, long-chain polyether subunit comprising a polyoxyalkylene group;
(b) one or more polyisocyanate prepolymers comprising the reaction product of:
one or more polyols; and
a polyfunctional isocyanate having a functionality of about 2 or more;
(c) greater than or equal to 15 wt % polymeric MDI having a functionality of greater than 2.3; and
(d) a first aromatic or aromatic-aliphatic tackifying resin having a softening point greater than or equal to about 120° C.
2. The adhesive composition of claim 1 , wherein the composition additionally comprises one or more vinyl polymers.
3. The adhesive composition of claim 1 , wherein the polymeric MDI is present at about 15 to about 30 weight percent with respect to the total adhesive composition.
4. The adhesive composition of claim 1 , wherein the polymeric MDI is present at greater than or equal to 20 wt %.
5. The adhesive composition of claim 1 , wherein the composition further comprises a second tackifying resin.
6. The adhesive composition of claim 5 , wherein the first aromatic or aromatic aliphatic tackifying resin and the second tackifying resin are independently derived from monomers selected from the group consisting of C 4-6 diene monomers, styrenic monomers, indene monomers, dicyclopentadiene monomers, and mixtures thereof.
7. The adhesive composition of claim 5 , wherein the first aromatic or aromatic-aliphatic tackifying resin and the second tackifying resin are independently derived from styrene monomers, alpha-methylstyrene monomers, vinyl toluene monomers, methoxystyrene monomers, tertiary butyl styrene monomers, and combinations thereof.
8. The adhesive composition of claim 5 , wherein the first aromatic or aromatic-aliphatic tackifying resin has a softening point greater than or equal to about 130° C. and the second tackifying resin has a softening point that is from about 85° C. to about 120° C.
9. The adhesive composition of claim 5 , wherein the first aromatic or aromatic-aliphatic tackifying resin has a softening point greater than or equal to about 140° C. and the second tackifying resin has a softening point from about 100° to about 110° C.
10. The adhesive composition of claim 5 , wherein the ratio of the second tackifying resin to the first aromatic or aromatic-aliphatic tackifying resin can range from about 1:1 to about 3:1.
11. The adhesive composition of claim 1 wherein the polyester polyether copolymer has an Mw greater than or equal to about 100,000.
12. An article formed by laminating two substrates with the adhesive of claim 1 .
13. The article according to claim 12 , wherein at least one of the substrates comprises high pressure laminate (HPL), medium density fiberboard (MDF), or a high density mineral composite material.
14. The article according to claim 12 , wherein the article is a door.
15. The article according to claim 14 , wherein the article is a fire resistant door that passes UL 10C.
16. An adhesive composition comprising:
(a) from about 5 to about 55 wt % of one or more polyester polyether copolymers of formula I:
wherein Nu is a predominately cyclic nucleus and R 1 is randomly selected from either a C 2-6 alkylene or an amorphous, long-chain polyether subunit comprising a polyoxyalkylene group;
(b) from 20 to about 50 wt % of one or more polyisocyanate prepolymers comprising the reaction product of:
one or more polyols; and
a polyfunctional isocyanate having a functionality of about 2 or more;
(c) greater than or equal to 15 wt % polymeric MDI having a functionality greater than 2.3; and
(d) a first aromatic or aromatic-aliphatic tackifying resin having a softening point greater than or equal to about 120° C.
17. The adhesive composition of claim 16 wherein the total amount of tackifying resin is present at from about 20 to about 40 wt %.
18. The adhesive composition of claim 16 additionally comprising a vinyl polymer.