Latex compositions having improved drying speed

• US 6,590,025 B1
• Filed: 02/13/1997
• Issued: 07/08/2003
• Est. Priority Date: 02/26/1996
• Status: Expired due to Fees

• Current Assignee: Rohm and Haas Company (Dow, Inc.)
• Original Assignee: Rohm and Haas Company (Dow, Inc.)
• Inventors: Beckley, Ronald Scott, Carlson, Virginia Ann
• Primary Examiner(s): Reddick, Judy M.
• Application Number:
  US08/791,202
• Time in Patent Office: 2,336 Days
• Field of Search: 524/558, 524/560, 524/591, 524/556, 524/114, 524/612, 524/261, 524/549, 524/507, 522/71, 522/83, 522/84, 522/85, 522/86, 523/402, 523/415, 523/409, 523/410, 523/412, 523/411
• US Class Current: 524/507
• CPC Class Codes: C08F 8/30 Introducing nitrogen atoms or nitrogen-containing groups
• CPC Class Codes: C08F 8/42 Introducing metal atoms or metal-containing groups
• CPC Class Codes: C08L 33/06 of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
• CPC Class Codes: C08L 35/06 Copolymers with vinyl aromatic monomers
• CPC Class Codes: C09D 133/062 Copolymers with monomers not covered by C09D133/06

Abstract

Disclosed are modified latexes having improved drying speed, comprising a polymer having one or more pendant side chains, such side chain comprising the product of the reaction between a mono- or poly-functional group capable of reacting with an acid or hydroxyl unit, and such units present on the precursor polymer. Such modified latexes are storage-stable one-pack compositions useful alone or in combination in coating applications, or as adhesives, sizing agents, composites, impregnants, castings, caulks, and non-woven binders. Also disclosed is a method for providing a crosslinked protective coating on a substrate, comprising the steps of: applying a coating of the composition of the present invention to the substrate; and allowing the composition to cure at ambient temperature or greater, or applying radiation to the composition to effect curing.

Claims

1. A modified one-pack, storage-stable latex composition having improved drying speed, comprising an aqueous dispersion of a polymer containing one or more pendant side chains, said one or more side chains being formed by the reaction of a mixture consisting essentially of a precursor polymer having one or more acid or hydroxyl groups, and a functional group on a compound selected from the group consisting of a mono- or poly-functional aliphatic isocyanate and a mono-functional oxazoline;

and

wherein said precursor polymer is a polymer selected from the group consisting of an acrylic polymer, a vinyl addition polymer, a styrene-butadiene polymer an alkyd polymer, an epoxy polymer, a polyester polymer, a polyurea polymer, and combinations thereof.

2. The modified latex composition of claim 1, wherein the amount of side chain present in the composition is between 1 and 20 wt %, based on the total weight of the polymer.

3. The modified latex composition of claim 2, wherein the amount of side chain present in the composition is between 2.5 and 10 wt %, based on the total weight of the polymer.

4. An aqueous, storage-stable crosslinkable coating composition comprising the modified latex composition of claim 1.

5. An aqueous, storage-stable, radiation-curable coating composition comprising the modified latex composition of claim 1, wherein the polymer comprises a radiation-curable polymer.

6. The composition of claim 1 wherein said reaction to form said side chains results from blending and stirring said mixture and then allowing said mixture to react for a period of 24-48 hours.

7. The composition of claim 1 wherein said aliphatic isocyanate is selected from the group consisting of octyl isocyanate and polymeric hexamethylene diisocyanate.