PRIMER FOR COMPOSITE BUILDING MATERIALS

• US 20090004468A1
• Filed: 06/27/2008
• Published: 01/01/2009
• Est. Priority Date: 06/28/2007
• Status: Abandoned Application

• Current Assignee: James Hardie Technology Limited (James Hardie Industries Plc)
• Original Assignee: James Hardie Technology Limited (James Hardie Industries Plc)
• Inventors: Chen, Yongjun, Luo, Caidian
• Application Number:
  US12/163,452
• Publication Number:
  US 20090004468A1
• Time in Patent Office: Days
• US Class Current: 428/351
• CPC Class Codes: C04B 20/0048 Fibrous materials
• CPC Class Codes: C04B 2103/0065 Polymers characterised by their glass transition temperature (Tg)
• CPC Class Codes: C04B 2103/0094 Agents for altering or buffering the pH; Ingredients characterised by their pH
• CPC Class Codes: C04B 2103/40 Surface-active agents, dispersants
• CPC Class Codes: C04B 2103/44 Thickening, gelling or viscosity increasing agents
• CPC Class Codes: C04B 2103/54 Pigments; Dyes
• CPC Class Codes: C04B 2103/67 Biocides
• CPC Class Codes: C04B 2111/00491 Primers
• CPC Class Codes: C04B 28/02 containing hydraulic cements other than calcium sulfates
• CPC Class Codes: C04B 41/009 characterised by the material treated
• CPC Class Codes: C04B 41/483 Polyacrylates
• CPC Class Codes: C04B 41/502 Water
• CPC Class Codes: C04B 41/63 Macromolecular compounds
• CPC Class Codes: C08K 3/013 Fillers, pigments or reinforcing additives
• CPC Class Codes: C08K 5/098 Metal salts of carboxylic acids
• CPC Class Codes: C09D 5/002 Priming paints C09D5/08 takes precedence
• CPC Class Codes: Y10T 428/2835 including moisture or waterproof component

Abstract

An improved primer formulation for composite building materials, such as materials that are generally cementitious, gypsum, or of another inorganic building material, such as those containing cellulose, glass, steel or polymeric fibers. The improved formulation effectively blocks moisture from penetrating the composite building material and is better than alternate or conventional primers. The formulation also improves adhesion and prevents peel failure of a topcoat when applied to the composite building material. The improved formulation acts as a weather-guard and a hydrophobic treatment to all surfaces of the composite building material upon application.

Claims

1. A primer formulation for composite building materials comprising a polymer, wherein the polymer has a glass transition temperature of about 50°

to 70°

C. and a minimum film formation temperature of at or below about 30°

C.

6. The formulation of claim 1, wherein at least one of the one or more dispersants is a hydrophobic copolymer polyelectrolyte.

7. The formulation of claim 1, wherein at least one of the one or more wetting agents is an acrylic wetting agent.

8. The formulation of claim 1, wherein at least one of the one or more biocides is an industrial alginate.

9. The formulation of claim 1, wherein at least one of the one or more thickeners is a non-ionic urethane.

10. The formulation of claim 1, wherein at least one of the one or more self cross-linking polymers is latex.

11. The formulation of claim 1, wherein at least one of the one or more pigments is titanium oxide, iron oxide, phthalocyanine blue and any combination thereof.

12. The formulation of claim 1, wherein at least one of the one or more extenders is selected from the group consisting of calcium carbonate, talc, calcined clay, calcium silicate and any combination thereof.

13. The formulation of claim 1, wherein the formulation improves adhesion of a topcoat to the composite building material.

2. A primer formulation for composite building materials comprising:

at least one hard polymer, wherein the hard polymer has a glass transition temperature of at or below about 30°

C.; and

at least one soft polymer, wherein the soft polymer has a glass transition temperature of greater than 50°

C.

3. A primer formulation for composite building materials comprising one or more polymers, wherein the polymer has a particle size distribution that is bimodal.

4. The formulation of claim 3, wherein the particle size distribution includes a first peak at or below about 100 nanometers and a second peak greater than about 200 nanometers.

5. A primer formulation for composite building materials comprising:

up to 60% water;

up to 1% of one or more dispersants;

up to 0.5% of one or more wetting agents;

up to 1% of one or more biocides;

up to 1% of one or more antiblocking agents;

up to 0.5% of one or more thickeners;

up to 1% of one or more pH adjusters;

up to 50% of one or more acrylate polymers;

up to 30% of one or more pigments;

up to 70% of one or more extenders;

up to 30% of one or more fillers, and

up to 1% of one or more functional pigments.

14. An improved primer formulation for improved adhesion of a topcoat to a composite building material, wherein the improvement is a reduction in a peel failure of the topcoat by greater than 50% as compared to a primer of a same thickness and a different formulation.

15. An improved primer formulation for improved performance of a composite building material, wherein the improvement is a reduction in moisture absorption of about 25% as compared to a primer of a same thickness and a different formulation.

16. A composite building material with an improved primer formulation applied to its surface, wherein the improved primer formulation reduces moisture absorption of the composite building material by at least 25% as compared to a primer formulation of a same thickness and a different formulation.