Two-part acrylic-urethane adhesive

• US 20070072992A1
• Filed: 09/28/2006
• Published: 03/29/2007
• Est. Priority Date: 09/28/2005
• Status: Active Grant

• Current Assignee: Rohm and Haas Company (Dow, Inc.)
• Original Assignee: Rohm and Haas Company (Dow, Inc.)
• Inventors: Chen, Mai, Rice, Katherine, Zack, Christine
• Granted Patent: US 7,414,091 B2
• Time in Patent Office: Days
• US Class Current: 524/589
• CPC Class Codes: C08G 18/0871 the dispersing or dispersed phase being organic
• CPC Class Codes: C08G 18/4063 Mixtures of compounds of group C08G18/62 with other macromolecular compounds
• CPC Class Codes: C08G 18/4825 Polyethers containing two hydroxy groups C08G18/4833 - C08G18/5096 take precedence
• CPC Class Codes: C08G 18/6225 Polymers of esters of acrylic or methacrylic acid
• CPC Class Codes: C08G 18/625 Polymers of alpha-beta ethylenically unsaturated carboxylic acids; hydrolyzed polymers of esters of these acids
• CPC Class Codes: C08G 18/6254 Polymers of alpha-beta ethylenically unsaturated carboxylic acids and of esters of these acids containing hydroxy groups
• CPC Class Codes: C08G 18/706 the liquid medium being water
• CPC Class Codes: C08G 2170/80 Compositions for aqueous adhesives
• CPC Class Codes: C08L 33/00 Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
• CPC Class Codes: C09J 175/04 Polyurethanes
• CPC Class Codes: C09J 175/08 from polyethers
• CPC Class Codes: C09J 175/14 Polyurethanes having carbon-to-carbon unsaturated bonds

Abstract

A two-component bonding agent composition of an aqueous component having a polyol and an acrylic-styrene polymer, and an isocyanate component having a water dispersible polyisocyanate.

Claims

1. A two-component bonding agent composition, comprising:

(a) a first component which is an aqueous mixture whose solid portion comprises;

(i) 0.1 to 10 wt % of a polyol containing at least two hydroxyl groups and being selected from the group consisting of polyether polyols, polyester polyols, polyether polyester polyols and mixtures thereof; and

(ii) 90 to 99.9% of a polymer having from 20-60% residues of at least one styrene monomer, from 40-80% residues of at least one acrylic monomer having a T_g less than 0°

C., from 1-4% residues of (meth)acrylic acid and less than 0.5% residues of hydroxyl-containing monomers; and

(b) a second component comprising a water dispersible polyisocyanate,

wherein said second component is present relative to said first component at a molar ratio of NCO/NCO-reactive groups of 1;

1 to 8;

1.

2. The composition of claim 1 wherein said polyol is polypropylene glycol.

3. The composition of claim 2 wherein said polyol has a molecular weight between about 200 and about 1,000.

4. The composition of claim 1 wherein said polymer has from 23-45% residues of styrene, from 55-75% residues of at least one C₄-C₁₂ alkyl acrylate ester monomer, from 1-3% residues of (meth)acrylic acid and less than 0.2% residues of hydroxyl-containing monomers;

and wherein said polymer has a weight average molecular weight between 5000 and 2,000,000.

5. The composition of claim 4 wherein said polymer has from 1-3% residues of acrylic acid.

6. The composition of claim 5 wherein said polyol is polypropylene glycol having a molecular weight from 200 to 1,000.

7. The composition of claim 1 wherein said water dispersible polyisocyanate is selected from polyisocyanates based on toluene diisocyanate, isophorone diiusocyanate, hexamethylene diisocyanate, diphenyl methane diisocyanate, dicyclohexyl methane diisocyanate, isomers thereof or mixtures thereof.

8. The composition of claim 1, wherein the molar ratio of NCO/NCO-reactive groups is from 3:

1 to 5;

1.

9. A process for making a laminated article wherein at least two substrate layers are bonded together by a layer of a bonding agent, comprising bonding said at least two substrate layers with the bonding agent composition of claim 1.

10. A process for producing a coating on a substrate;

said process comprising applying a layer of the bonding agent composition of claim 1.