Polymer composition

• US 20080139737A1
• Filed: 12/12/2006
• Published: 06/12/2008
• Est. Priority Date: 12/13/2005
• Status: Active Grant

• Current Assignee: Rohm and Haas Company (Dow, Inc.)
• Original Assignee: Rohm and Haas Company (Dow, Inc.)
• Inventors: Lennon, Kenneth, Halligan, John Charles, Dombrowski, Gary William, Alderfer, Keith Allen
• Granted Patent: US 7,795,343 B2
• Time in Patent Office: Days
• US Class Current: 524/521
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 33/14 of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen
• CPC Class Codes: C08L 33/18 Homopolymers or copolymers of nitriles
• CPC Class Codes: C09D 133/14 of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
• CPC Class Codes: C09D 133/18 Homopolymers or copolymers of nitriles

Abstract

A polymer composition including polymer particles comprising a first polymer and a second polymer is disclosed. The first polymer optionally has a crosslinked core and has a glass transition temperature in the range of −30° C. to 100° C. The second polymer comprising select crosslinking groups has a glass transition temperature in the range of −10° C. to less than 18° C. A coating composition comprising the polymer composition is provided. The polymer composition has good low temperature film formation and provides a film with an acceptable level of hardness.

Claims

1. A polymer composition comprising polymer particles dispersed in an aqueous medium, wherein the polymer particles comprise, based on the weight of the polymer particles:

(a) from 20 to 70 weight % of a first polymer wherein the first polymer has a Tg from −

30°

C. to 100°

C. and comprises as polymerized units, based on the weight of the first polymer

i) 15 to 50 weight % of one or more of the following monomers;

acrylonitrile, methacrylonitrile, vinylbenzonitrile and its isomers, cyanoacrylates, vinyl chloride, vinylidene chloride, alpha-cyano styrene and other multiply cyanated styrenics, and

ii) 50 to 85 weight % of one or more ethylenically unsaturated comonomers, and

(b) 30 to 80 weight % of a second polymer wherein the second polymer has a Tg from −

10°

C. to 18°

C. and comprises as polymerized units, based on the weight of the second polymer;

i) 70 to 98.5 weight % of one or more ethylenically unsaturated comonomers,

ii) 0.5 to 10 weight % of one or more acid functional or anionic monomers, and

iii) 1 to 20 weight % of one or more monomers selected from the group consisting of acetoacetoxyethyl(meth)acrylate, acetoacetoxypropyl(meth)acrylate, acetoacetoxybutyl(meth)acrylate, 2,3-di(acetoacetoxy)propyl(meth)acrylate, allyl acetoacetate, and vinyl acetoacetate;

acetoacetamidoethyl(meth)acrylate, acetoacetamidopropyl(meth)acrylate, acetoacetamidobutyl(meth)acrylate, 2,3-di(acetoacetamido)propyl(meth)acrylate, allyl acetoacetamide, and vinyl acetoacetamide;

cyanoacetoxyethyl(meth)acrylate, cyanoacetoxypropyl(meth)acrylate, cyanoacetoxybutyl(meth)acrylate, 2,3-di(cyanoacetoxy)propyl(meth)acrylate, allyl cyanoacetate, and vinyl cyanoacetate;

cyanoacetamidoethyl(meth)acrylate, cyanoacetamidopropyl(meth)acrylate, cyanoacetamidobutyl(meth)acrylate, 2,3-di(cyanoacetamido)propyl(meth)acrylate, allyl cyanoacetamide, and vinyl cyanoacetamide.

2. The polymer composition of claim 1 wherein the first polymer further comprises 0.1 to 10 weight %, based on the weight of the first polymer, of one or more multiethylenically unsaturated monomers.

3. The polymer composition of claim 1 wherein (a) the first polymer further comprises 0.5 to 5 weight % of one or more acid functional or anionic monomers, or polymerizable stabilizing reagents;

or (b) the polymer composition comprises a stabilizing reagent.

4. The polymer composition of claim 2 wherein (a) the first polymer further comprises 0.5 to 5 weight % of one or more acid functional or anionic monomers, or polymerizable stabilizing reagents;

or (b) the polymer composition comprises a stabilizing reagent.

5. The polymer composition according to claim 1, wherein (a) the second polymer further comprises 0.5 to 10 weight %, based on the weight of the second polymer, of one or more acid functional or anionic monomers, or polymerizable stabilizing reagents;

or (b) the polymer composition comprises a stabilizing reagent.

6. The polymer composition according to claim 2, wherein (a) the second polymer further comprises 0.5 to 10 weight %, based on the weight of the second polymer, of one or more acid functional or anionic monomers, or polymerizable stabilizing reagents;

or (b) the polymer composition comprises a stabilizing reagent.

7. The polymer composition according to claim 1 wherein the second polymer has a Tg in the range of −

10°

C. to 15°

C.

8. The polymer composition according to claim 1 whose minimum film formation temperature is no greater than 30°

C.

9. A coating composition comprising a polymer composition according to claim 1 wherein the coating composition comprises one or more pigments wherein the coating composition has a pigment volume concentration from 1 to 45%.

10. The coating composition according to claim 8 comprising from 0.01 to less than 6 weight % volatile organic compounds, based on the weight of the dry polymer composition.

11. The coating composition according to claim 8 wherein the second polymer has a Tg in the range of −

10°

C. to 15°

C.

12. The coating composition according to claim 8 whose minimum film formation temperature is no greater than 30°

C.