Reactive Hot Melt Adhesives With Improved Adhesion

Patent metadata

Field	Value
Publication number	US-2016333236-A1
Application number	US-201615202614-A
Country	US
Kind code	A1
Filing date	Jul 6, 2016
Priority date	Jan 14, 2014
Publication date	Nov 17, 2016
Grant date	—

Abstract

The present specification relates to moisture reactive hot melt adhesive compositions comprising a silane reactive plasticizer and the reaction product of (i) a semi-crystalline polyol and (ii) a polyisocyanate and (iii) an aminosilane; the production of such adhesives; and the use of such adhesives.

First claim

1 . A moisture curable composition comprising:
a reaction product of (i) a semi-crystalline polyol and (ii) a polyisocyanate and (iii) a primary aminosilane; and a silane reactive plasticizer.

2 . The moisture curable composition of claim 1 wherein the equivalent ratio of polyisocyanate (ii) to semi-crystalline polyol (i) is >1.4.

3 . The moisture curable composition of claim 1 wherein the ratio of equivalents of primary aminosilane (iii) to [equivalents of polyisocyanate (ii)−equivalents of semi-crystalline polyol (i)] is about 1 or greater.

4 . The moisture curable composition of claim 1 being free of water and solvent.

5 . The moisture curable composition of claim 1 wherein the equivalent ratio of polyisocyanate (ii) to semi-crystalline polyol (i) is >1.

6 . The moisture curable composition of claim 1 further comprising adhesion promoter.

7 . The moisture curable composition of claim 1 further comprising an aminosilane adhesion promoter.

8 . The moisture curable composition of claim 1 wherein the equivalent ratio of isocyanate to polyol is greater than 1 to 1.

9 . The moisture curable composition of claim 1 wherein the equivalent ratio of isocyanate to polyol is greater than 1.6 to 1.

10 . The moisture curable composition of claim 1 further comprising one or more of a tackifier; an acrylic polymer; and a catalyst.

11 . The moisture curable composition of claim 1 wherein weight ratio of polyester polyol to silane reactive plasticizer is greater than 1 part polyester polyol to 1 part silane reactive plasticizer.

12 . The moisture curable composition of claim 1 wherein weight ratio of polyester polyol to silane reactive plasticizer is greater than 1.2 parts polyester polyol to 1 part silane reactive plasticizer.

13 . The moisture curable composition of claim 1 wherein the silane reactive plasticizer comprises at least one silyl group with a formula of
R-[A-Si(C x H 2x+1 ) n (OH) 3−n ] z
or
R-[A-Si(C x H 2x+1 ) n (OC y H 2y+1 ) 3−n ] z

wherein
R is a polymer backbone;
A is a linkage to the polymer backbone;
x is 1 to 12;
y is 1 to 12; and
n is 0, 1 or 2.

14 . The moisture curable composition of claim 13 , wherein polymer backbone R is selected from silicone, polyether, polycarbonate, polyisobutylene, ethylene vinyl acetate and polyacrylate.

13 . (canceled)

14 . (canceled)

15 . The moisture curable composition of claim 1 being free of isocyanate monomer.

16 . The moisture curable composition of claim 1 comprising about 70 to about 90 weight percent reaction product and about 10 to about 30 weight percent silane reactive plasticizer.

17 . A method of applying a moisture curable composition comprising:
providing the moisture curable composition of claim 1 in solid form at room temperature; heating the moisture curable composition to a molten state at the point of use; applying the molten moisture curable composition to a first substrate; bringing a second substrate in contact with the molten moisture curable composition applied to the first substrate; cooling the applied molten moisture curable composition to a solid state; subjecting the cooled composition to conditions sufficient to irreversibly cure the cooled composition to form a bond between the first and second substrates.

18 . An article of manufacture comprising the moisture curable composition of claim 1 .

19 . A moisture curable hot melt adhesive comprising the moisture curable composition of claim 1 .

20 . The moisture curable composition of claim 1 in cured form.

21 . The moisture curable composition of claim 1 , wherein the silane reactive plasticizer is a liquid at room temperature and polymer backbone R is selected from polyether, polycarbonate, polyisobutylene, and polyacrylate.

22 . The moisture curable composition of claim 1 wherein the reaction product comprises a plurality of terminal silyl groups each independently having a formula of:
R-[A-Si(C x H 2x+1 ) n (OC y H 2y+1 ) 3−n ] z
wherein R is the polyester backbone;
A is a linkage that links the silane to polymer backbone R;
n=0, 1 or 2;
x and y are, independently a number from 1 to 12.

Assignees

• Henkel IP & Holding GmbH

Inventors

• Suen Wu

Classifications

• C09J201/10

  containing hydrolysable silane groups · CPC title

• C08L75/06

  from polyesters · CPC title

• C09J175/06 Primary

  from polyesters · CPC title

• C09J183/08

  containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen · CPC title

• C08G18/68

  Unsaturated polyesters · CPC title