UV CURABLE COATING COMPOSITION

• US 20080242757A1
• Filed: 05/09/2008
• Published: 10/02/2008
• Est. Priority Date: 04/27/2004
• Status: Abandoned Application

• Current Assignee: Clifford M. Bridges, Larry Galeza, Michael J. Dvorchak, Ramesh Subramanian, Robert A. Wade
• Original Assignee: Clifford M. Bridges, Larry Galeza, Michael J. Dvorchak, Ramesh Subramanian, Robert A. Wade
• Inventors: Bridges, Clifford M., Dvorchak, Michael J., Subramanian, Ramesh, Wade, Robert A., Galeza, Larry
• Application Number:
  US12/117,827
• Publication Number:
  US 20080242757A1
• Time in Patent Office: Days
• US Class Current: 522/96
• CPC Class Codes: C08G 18/0823 containing carboxylate salt groups or groups forming them
• CPC Class Codes: C08G 18/12 using two or more compounds having active hydrogen in the first polymerisation step
• CPC Class Codes: C08G 18/3228 acyclic
• CPC Class Codes: C08G 18/42 Polycondensates having carboxylic or carbonic ester groups in the main chain
• CPC Class Codes: C08G 18/4288 modified by higher fatty oils or their acids or by resin acids
• CPC Class Codes: C08G 18/4854 Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
• CPC Class Codes: C08G 18/6692 with compounds of group C08G18/34
• CPC Class Codes: C08G 18/672 Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen
• CPC Class Codes: C08G 18/706 the liquid medium being water
• CPC Class Codes: C08L 2666/20 Macromolecular compounds having nitrogen in the main chain according to C08L75/00 - C08L79/00; Derivatives thereof
• CPC Class Codes: C08L 75/14 Polyurethanes having carbon-to-carbon unsaturated bonds
• CPC Class Codes: C08L 75/16 having terminal carbon-to-carbon unsaturated bonds
• CPC Class Codes: C09D 167/07 having terminal carbon-to-carbon unsaturated bonds
• CPC Class Codes: C09D 175/16 having terminal carbon-to-carbon unsaturated bonds

Abstract

The present invention is directed to a composition curable by radiation having a wavelength of 300 nm or more, a method of producing a coated substrate using such composition and the coated product so-produced. More particularly, the composition of the present invention comprises A) from about 1 to about 99% by weight of a specific aqueous polyurethane dispersion having a solids content of from about 20 to about 50% by weight, B) from about 1 to about 99% by weight of an aqueous polyester acrylate/urethane dispersion having a solids content of from about 20 to about 60% by weight, C) one or more photoinitiators, and D) water or a mixture of water and solvent

Claims

1. A composition curable by radiation having a wavelength of 300 nm or more, comprising:

A) from about 1 to about 99% by weight of an aqueous polyurethane dispersion having a solids content of from about 20 to about 50% by weight and being prepared from components comprising;

a) from about 5 to about 50% by weight of a polyester prepared from

ai) from about 30 to about 85% by weight of castor oil fatty acid,

aii) from about 10 to about 60% by weight of one or more carboxylic acids having from 8 to 30 carbon atoms and from 0 to 4 C═

C double bonds and

aiii) from about 3 to about 20% by weight of one or more alcohols with an average functionality of from about 2.5 to about 3.5,

wherein the percentages of components A)ai) through A)aiii) total 100%,

b) from about 5 to about 60% of one or more polyisocyanates,

c) from about 0.5 to about 40% by weight of one or more non-hydrophilic polymeric polyols having number average molecular weights of about 500 to about 6000,

d) from 0 to about 10% by weight of a monoalcohol and or a monoamine,

e) from about 0.5 to about 15% by weight of a material having a number average molecular weight of below 500 and being selected from the group consisting of polyols, an aminopolyols and polyamines, and

f) from 0 to about 10% by weight of an OH- and/or an NH-functional, nonionic, hydrophilic polyoxyalkylene ether, having a number average molecular weight of from about 250 to about 3000,

wherein the percentages of components A)a) through A)f) total 100%,

B) from about 1 to about 99% by weight of an aqueous polyester acrylate/urethane dispersion having a solids content of from about 20 to about 60% by weight and prepared by reaction of

a) from about 40 to about 90% by weight of one or more acrylate polymers containing hydroxyl groups and having an OH number of from about 40 to about 120,

b) from 0.1 to about 20% by weight of one or more compounds containing i) one and/or two functional groups compounds reactive towards isocyanate groups and ii) groups which are cationic and/or anionic and/or have a dispersant action due to ether groups content,

c) from about 10 to about 50% by weight of one or more di- and/or polyisocyanates,

d) from 0 to about 30% by weight of a di- and/or polyol having a number average molecular weight of up to about 5000, an OH functionality of from 1.8 to 2.2, containing no groups which are cationic or anionic, containing an insufficient amount of ether groups to have a dispersant action and containing no ethylenically unsaturated groups, and

e) from about 0.1 to about 10% by weight of one or more di- and/or polyamines having a number average molecular weight of from about 31 to about 700,

wherein the percents by weight are based on the total amount of components B)a) through B)e) and total 100%,

C) from about 0.1 to about 10% by weight of one or more photoinitiators, wherein the % by weight of component C) is based on the combined weight of components A) and B) and wherein the percentages of components A) and B) total 100%, and

D) from about 20 to about 60% by weight of water or a mixture of water and solvent, wherein the % by weight of component D) is based on the total combined solids content of components A) and B).

2. The composition of claim 1, wherein component A) is present in amount of from about 10% to about 90% by weight, component B) is present in an amount of from about 10 to about 90% by weight and component C) is present in an mount of from about 0.5 to about 6% by weight.

3. The composition of claim 2, wherein component A) is present in amount of from about 25% to about 75% by weight, component B) is present in an amount of from about 25 to about 75% by weight and component C) is present in an mount of from about 1 to about 4% by weight.

4. The composition of claim 1, wherein component B)a) is used in amount of from about 50 to about 80% by weight, component B)b) is used in amount of from about 2 to about 15% by weight, component B)c) is used in amount of from about 15 to about 40% by weight, component B)d) is used in amount of from about 0 to about 20% by weight and component B)e) is used in amount of from about 0.5 to about 7% by weight.

5. The composition of claim 1, wherein component A)a) is prepared by reacting from about 50 to about 70% by weight of component A)a)i), from about 25 to about 35% by weight of component A)a)ii) and from about 5 to about 15% by weight of component A)a)iii).

6. The composition of claim 1, wherein component A)c) has an OH functionality of from about 1.8 to about 4 and a number average molecular weight of from about 800 to about 2500.

7. The composition of claim 1, wherein component A)d) has a number average molecular weight of from about 31 to about 1000.

8. The composition of claim 1, wherein component B)a) contains from about 0.1 to about 10 moles/kg, based on the weight of component B)a), of C═

C bonds.

9. The composition of claim 1, wherein component B) has a solids content of from about 30 to about 55% by weight.

10. The composition of claim 1 further comprising from about 0.1 to about 35% by weight of a material that crosslinks through carboxyl groups, hydroxyl groups, amino groups or moisture.

11. A process for coating a substrate comprising

i) applying the composition of claim 1 to a substrate and

ii) subjecting the coated substrate to radiation having a wavelength of 300 nm or more for a time sufficient to cure the composition.

12. The process of claim 11, wherein the wavelength of said radiation is from about 320 to about 450 nm.

13. The product produced according to the process of claim 12.