Reactive hot melt adhesive
First Claim
1. A hot melt adhesive composition comprising:
- (a) an isocyanate compound;
(b) a polyester-polyol;
(c) a reactive tackifying resin comprising a non-polar polyol having a hydroxyl number of about 50 or less; and
(d) a thermoplastic polymer.
6 Assignments
0 Petitions
Accused Products
Abstract
A hot melt curing urethane adhesives with heat stability, green bond strength and fully cured bond strength that are surprisingly compatible in production and use. The reactive hot melt adhesive composition includes a composition including an isocyanate compound; a polyester-polyol compound; a reactive tackifying resin including non-polar polyols; and a thermoplastic polymer. The components of the adhesive composition cooperate in at least some embodiments to form a hot melt compatible adhesive composition that has substantial initial green strength, substantial cured bond strength, chemical and heat resistance when cured, extended pot life, long open times, high heat resistance, (i.e., high PAFT), and good adhesion to plastics.
31 Citations
37 Claims
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1. A hot melt adhesive composition comprising:
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(a) an isocyanate compound;
(b) a polyester-polyol;
(c) a reactive tackifying resin comprising a non-polar polyol having a hydroxyl number of about 50 or less; and
(d) a thermoplastic polymer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
(a) from about 7 to about 18 wt-% of the isocyanate compound;
(b) from about 23 to about 52 wt-% of the polyester-polyol, or a mixture of polyester-polyol and a polyether-polyol;
(c) from about 5 to about 25 wt-% of the reactive tackifying resin;
(d) from about 15 to about 35 wt-% of the thermoplastic polymer; and
(e) from 0 to about 20 wt-% of a non-reactive tackifying resin.
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18. The composition of claim 1, wherein the weight ratio of the combined weight of the polyester-polyol and isocyanate components in relation to the reactive tackifying resin is about 2:
- 1 to about 3;
1.
- 1 to about 3;
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19. The composition of claim 2, wherein the weight ratio of the combined weight of the polyester-polyol, the polyether-polyol and the isocyanate components in relation to the reactive tackifying resin is about 2:
- 1 to about 3;
1.
- 1 to about 3;
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20. A method of bonding at least two surfaces which comprises applying to at least one surface an effective bonding amount of the adhesive of claim 1 and curing the adhesive.
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21. The hot melt adhesive composition of claim 1 wherein said hot melt adhesive has increased temperature resistance.
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22. The hot melt adhesive composition of claim 1 wherein said hot melt adhesive has increased open time.
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23. The hot melt adhesive of claim 1 wherein said reactive tackifying resin is selected from the group consisting of a terpen-phenolic copolymer resin, a rosin acid/diepoxy, a hydroxy modified rosin ester and mixtures.
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24. The hot melt adhesive of claim 1 wherein said reactive tackifying resin is present in at least 30% by weight.
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25. A hot melt adhesive composition comprising:
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(a) an isocyanate compound;
(b) a polyester-polyol;
(c) a reactive tackifying resin comprising a non-polar polyol, wherein the reactive tacking resin is selected from the group consisting of a terpene-phenolic copolymer resin, a rosin acid/diepoxy, a hydroxy modified rosin ester and mixtures thereof, and (d) a thermoplastic polymer. - View Dependent Claims (26, 27, 28)
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- 29. A method of increasing temperature resistance and open time in a hot melt adhesive composition, the method comprising incorporating into said adhesive an isocyanate compound, a polyester-polyol, and a reactive tackifying resin comprising a non-polar polyol having a hydroxyl number about 50 or less.
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34. A process for making a hot melt adhesive composition, the process comprising:
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(a) providing a polyester-polyol component;
(b) adding to the polyesterpolyol component a reactive tackifying resin comprising a non-polar polyol having a hydroxyl number of about 50 or less and a thermoplastic polymer to form a first mixture; and
thereafter(c) adding an isocyanate compound to the first mixture. - View Dependent Claims (35, 36, 37)
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Specification