Use of latex for impregnating porous substrates

• US 20040068045A1
• Filed: 07/10/2003
• Published: 04/08/2004
• Est. Priority Date: 01/18/2001
• Status: Abandoned Application

• Current Assignee: ATOFINA Chemicals, Inc. (Arkema)
• Original Assignee: ATOFINA Chemicals, Inc. (Arkema)
• Inventors: Betremieux, Isabelle, Duque, Baudouin, Verge, Christophe
• Application Number:
  US10/466,200
• Publication Number:
  US 20040068045A1
• Time in Patent Office: Days
• US Class Current: 524/556
• CPC Class Codes: C04B 2103/402 anionic
• CPC Class Codes: C04B 2103/406 non-ionic
• CPC Class Codes: C04B 28/02 containing hydraulic cements other than calcium sulfates
• CPC Class Codes: C04B 28/14 containing calcium sulfate cements gypsum-paper plates E04C
• CPC Class Codes: C04B 41/009 characterised by the material treated
• CPC Class Codes: C04B 41/4876 Polystyrene
• CPC Class Codes: C04B 41/502 Water

Abstract

The invention concerns the use in a treating composition for reinforcing porous substrates, of a latex based on polymer particles with diameter ranging between 50 and 200 nm having a proportion of solids ranging between 20 to 60 wt. % and containing acid functions.

Claims

1. A method for reinforcing porous substrates, the method comprising the step of applying a latex to a porous substrate wherein the latex comprises at least one polymer dispersed in the form of particles with diameter between 50 and 200 nm, is stabilized with at least one surfactant, and has a solids content between 20 and 60%, characterized in that the latex further comprises between 10 and 50% by weight in relationship to the dispersed polymer of alkali-soluble polymer.

2. The method of claim 1, characterized in that the latex has a solids content greater than 25%.

3. The method of claim 2, characterized in that the latex has a solids content between 35 and 50%.

4. The method of claim 1, characterized in that the average diameter of the dispersed particles is between 80 and 120 nm.

5. The method of claim 1, characterized in that the alkali-soluble polymer is chosen from the group consisting of styrene maleic anhydride, styrene acrylic, and methacrylic acid or combinations thereof.

6. The method or combinations thereof of claim 1, characterized in that the akali-soluble polymer has an acid index between 100 and 500 g of KOH/g.

7. The method of claim 1, characterized in that the akali-soluble polymer has an average molecular mass by weight between 5000 and 15000.

8. The method of claim 1, characterized in that the akali-soluble polymer has a styrene to maleic anhydride ratio or styrene to (meth)acrylic acid ratio between 1 and 6.

9. A porous substrate treated with a reinforcing latex according to claim 1.