Water soluble/dispersible and easy removable cationic adhesives and coating for paper recycling

• US 6,969,752 B1
• Filed: 07/21/2000
• Issued: 11/29/2005
• Est. Priority Date: 07/21/2000
• Status: Expired due to Fees

• Current Assignee: Georgia Tech Research Corporation (University System of Georgia)
• Original Assignee: Georgia Tech Research Corporation (University System of Georgia)
• Inventors: Yan, Zegui, Deng, Yulin
• Primary Examiner(s): Lipman, Bernard
• Application Number:
  US09/621,695
• Time in Patent Office: 1,957 Days
• Field of Search: 629/22, 526/292.2, 525/421, 525/423
• US Class Current: 526/292.2
• CPC Class Codes: C08F 220/1804 C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
• CPC Class Codes: C08F 222/102 of dialcohols, e.g. ethylene glycol di(meth)acrylate or 1,4-butanediol dimethacrylate
• CPC Class Codes: C09J 133/26 Homopolymers or copolymers of acrylamide or methacrylamide

Abstract

The present invention is an adhesive or coating composition that is dispersible or dissolvable in water, making it useful in as a coating or adhesive in paper intended for recycling. The composition of the present invention is cationically charged thereby binding with the fibers of the paper slurry and thus, resulting in reduced deposition of adhesives on equipment during the recycling process. The presence of the composition of the present invention results in stronger interfiber bonding in products produced from the recycled fibers.

Claims

1. A recyclable adhesive or adhesive coating that is substantially tacky and forms a pressure-sensitive adhesive which is capable of bonding to a surface upon contact wherein the recyclable adhesive or adhesive coating comprises a polymer which is soluble or dispersible in water and is attracted to fibers during paper recycling wherein the polymer comprises

a) at least 5 to 40 mol % of cationic repeat units;

b) a cationic monomer compound wherein the cationic monomer compound is 3-methacrylamidopropyltrimethylammonium chloride; and

,

c) a second monomer compound copolymerizable with the cationic monomer compound wherein the second monomer compound is n-butyl acrylate.

2. The recyclable adhesive or adhesive coating of claim 1, wherein the backbone compound is present in the amount of 60 to 95 mole % based on the polymer.

3. The recyclable adhesive or adhesive coating of claim 1, wherein the backbone compound is present in the amount of 80 to 90 mole % based on the polymer.

4. The recyclable adhesive or adhesive coating of claim 1, wherein the cationically charged monomer is present in the amount of 5 to 40 mole % based on the polymer.

5. The recyclable adhesive or adhesive coating of claim 1, wherein the cationically charged monomer is present in the amount of 8 to 25 mole % based on the polymer.

6. The recyclable adhesive or adhesive coating of claim 1, wherein the polymer further comprises an internal cross-linker present in the amount of up to 2 mole %, based on the polymer.

7. The recyclable adhesive or adhesive coating of claim 6, wherein the polymer further comprises an internal cross-linker present in the amount of 0.1 to 1 mole %, based on the polymer.

8. The recyclable adhesive or adhesive coating of claim 6, wherein the internal cross-linker is chosen from at least one of ethylene glycol dimethylate, diallyl maleate, diallyl phthalate, divinyl benzene, and poly(ethylene glycol)di(meth)acrylate.

9. The recyclable adhesive or adhesive coating of claim 1, wherein the polymer further comprises up to 35 mole % based on the polymer of an uncharged water soluble monomer or macromer.

10. The recyclable adhesive or adhesive coating of claim 9, wherein the uncharged water soluble monomer or macromer is chosen from at least one of dialkylaminoethyl methacrylate, hydroxy alkyl(meth)acrylate, hydroxy alkyl vinyl ether, poly(ethylene glycol)(meth)acrylate, poly(ethylene glycol), glycerol, diethylenetriamine, polyethyleneimine, and combinations of these compounds.

11. The recyclable adhesive or adhesive coating of claim 1, wherein the adhesive further comprises a plasticizer to increase the flexibility of the adhesive.

12. The recyclable adhesive or adhesive coating of claim 1, wherein the adhesive further comprises a tackifier to render the adhesive tacky.

13. The recyclable adhesive or adhesive coating of claim 1, wherein the adhesive or adhesive coating forms a tape.

14. The recyclable adhesive or adhesive coating of claim 1, wherein the adhesive or adhesive coating forms a label.

15. The recyclable adhesive or adhesive coating of claim 1, wherein the adhesive or adhesive coating forms a paper coating.

16. The recyclable adhesive or adhesive coating of claim 1, wherein the adhesive or adhesive coating forms a self-adhesive stamp.