Freeze-thaw stable paint formulation
AssigneeRohm and Haas Company
InventorsDavid G. Kelly, Pu Luo, Michael Rhodes, Yogesh Tiwary
Life of this patent
Estimating the term…
Abstract
The present invention relates to a pre-paint composite comprising an aqueous slurry of TiO2 particles and attached and unattached polymeric binder, and a sufficient amount of a secondary alcohol ethoxylate of the formula C10-15H22-32O(CH2CH2O)xH to give 35 to 90 weight percent attachment of polymeric binder to the TiO2 particles, based on the weight of total polymeric binder in the pre-paint composite, where x is from 15 to 50; and the O(CH2CH2O)xH group is bonded to a CH group on the C10-15H22-32 chain. The present invention also relates to a coatings composition containing the composite as well as a process for preparing the pre-paint composite and the coatings composition.
Claims10
A process for preparing a pre-paint composite comprising the steps of:
- a) contacting together a mixture of:
- i) an aqueous dispersion of TiO2 particles and an adsorbing sulfur acid functionalized polymer;
- ii) an anionic surfactant;
- iii) sodium styrene sulfonate;
- and
- iv) a redox initiator system;
- to form a first composite intermediate;
- then
- b) contacting under emulsion polymerization conditions the first composite intermediate with a first monomer emulsion comprising:
- i) methyl methacrylate or styrene or a combination thereof;
- ii) a C1-C10 alkyl acrylate;
- and
- iii) a carboxylic acid containing monomer under emulsion polymerization conditions;
- to form a second composite intermediate;
- then
- c) contacting the second composite intermediate with a second monomer emulsion comprising:
- i) styrene or methyl methacrylate or a combination thereof;
- ii) a C1-C10 alkyl acrylate;
- iii) carboxylic acid containing monomer;
- and
- iv) a secondary alcohol ethoxylate of the formula C12-14H26-30O(CH2CH2O)xH;
- to form an aqueous dispersion of TiO2 particles with incomplete attachment of polymeric binder;
- where x is from 20 to 40 and the O(CH2CH2O)xH group is bonded to a CH group on the C12-14H26-30 chain;
- wherein the extent of attachment of polymeric binder to the TiO2 particles is from 35 to 90 weight percent based on the weight of total polymer binder in the pre-paint composite.
A process for preparing a pre-paint composite comprising the steps of:
- a) contacting together a mixture of:
- i) an aqueous dispersion of TiO2 particles and an adsorbing sulfur acid functionalized polymer;
- ii) an anionic surfactant;
- iii) sodium styrene sulfonate;
- and
- iv) a redox initiator system;
- to form a first composite intermediate;
- then
- b) contacting under emulsion polymerization conditions the first composite intermediate with a first monomer emulsion comprising:
- i) methyl methacrylate or styrene or a combination thereof;
- ii) a C1-C10 alkyl acrylate;
- and
- iii) a carboxylic acid containing monomer under emulsion polymerization conditions;
- to form a second composite intermediate;
- then
- c) contacting the second composite intermediate with a second monomer emulsion comprising:
- i) styrene or methyl methacrylate or a combination thereof;
- ii) a C1-C10 alkyl acrylate;
- iii) carboxylic acid containing monomer;
- and
- iv) a secondary alcohol ethoxylate of the formula C10-15H22-32O(CH2CH2O)xH;
- to form an aqueous dispersion of TiO2 particles with incomplete attachment of polymeric binder;
- where x is from 15 to 50 and the O(CH2CH2O)xH group is bonded to a CH group on the C10-15H22-32 chain;
- wherein the extent of attachment of polymeric binder to the TiO2 particles is from 35 to 90 weight percent based on the weight of total polymer binder in the pre-paint composite.
Dependencies are inferred from the claim text.