Stable aqueous hybrid binder

Patent metadata

Field	Value
Publication number	US-9598557-B2
Application number	US-201114349108-A
Country	US
Kind code	B2
Filing date	Oct 21, 2011
Priority date	Oct 21, 2011
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

The present invention provides a new and simple processed stable colloidal silica containing polymeric binders, without modification, and to get to a novel coating composition, especially, aqueous coating composition that has more efficient stain resistance/removal function and also under a reasonable and controllable cost.

First claim

The invention claimed is:

1. A stable aqueous hybrid binder comprising:
a) at least one water dispersible polymer having a minimum film formation temperature of from −35° C. to 60° C. and comprising from 1 to 2.5 wt %, based on the dry weight of the polymer, copolymerized units of methacrylic acid;
b) at least one colloidal silica; and
c) an amount of neutralizer sufficient to maintain a pH value greater than or equal to 8.5;
wherein the at least one water dispersible polymer and particles of the at least one colloidal silica are present in a weight ratio of 0.2:1 to 5:1;
the surface acid value of the water dispersible polymer is from 1.0 to 4.0 mg KOH/g dried polymer, measured by centrifugation of the polymer, decanting a clear supernatant, redispersing the remaining polymer in deionized water, and titration with 0.50 N KOH; and
the serum phase acid value of the water dispersible polymer is from 0 to 2.3 mg KOH/g dried polymer, measured by adjusting the pH of the clear supernatant to 1.0 with 0.5 N HCl, and titration with 0.50 N KOH.

2. The stable aqueous hybrid binder according to claim 1 wherein the surface acid value of the water dispersible polymer is from 1.75 to 3.43 mg KOH/g dried polymer.

3. The stable aqueous hybrid binder according to claim 1 wherein the serum phase acid value of the water dispersible polymer is from 0.07 to 1.5 mg KOH/g dried polymer.

4. The stable aqueous hybrid binder according to claim 1 wherein the colloidal silica is derived from precipitated silica, micro silica, pyrogenic silica, silica gels, or a mixture thereof.

5. The stable aqueous hybrid binder according to claim 1 wherein the pH value of the hybrid binder is from 8.5 to 11.

6. The stable aqueous hybrid binder according to claim 1 wherein the neutralizer is 2-aminomethyl-2-methyl-propanol, ammonium hydroxide, or a mixture thereof.

7. A new process for making the stable aqueous hybrid binder according to claim 1 , comprising the steps of:
mixing at least one water dispersible polymer with at least one colloidal silica;
and adding a neutralizer in an amount sufficient to maintain a pH value greater than or equal to 8.5.

8. A coating composition comprising the stable aqueous hybrid binder according to claim 1 , wherein a crosslinker is not present.

Assignees

• Wang Yujiang
• Xu Jianming
• Mukkamala Ravi
• Rohm & Haas

Inventors

• Wang Yujiang
• Xu Jianming
• Mukkamala Ravi

Classifications

• C09D201/10 Primary

  containing hydrolysable silane groups · CPC title

• C08K3/36 Primary

  Silica · CPC title

• C09D157/04

  Copolymers in which only the monomer in minority is defined · CPC title

• C09D133/26

  Homopolymers or copolymers of acrylamide or methacrylamide · CPC title

• C09D133/12 Primary

  Homopolymers or copolymers of methyl methacrylate · CPC title