FINISHING COMPOSITION FOR PAINTABLE CLOTH AND PRODUCTS OBTAINED

Abstract

An aqueous finishing composition includes at least one polyglycerol, at least one organic polycarboxylic acid containing at least three carboxyl groups, at least one esterification catalyst, at least one plasticizer, and at least one thickener selected from a group consisting of cellulose derivatives, succinoglycans and xanthans.

Claims

1. An aqueous finishing composition, comprising: at least one polyglycerol, at least one organic polycarboxylic acid containing at least three carboxyl groups, at least one esterification catalyst, at least one plasticizer, and at least one thickener selected from a group consisting of cellulose derivatives, succinoglycans and xanthans.

2. The composition as claimed in claim 1, wherein the polyglycerol is a glycerol oligomer having a degree of polymerization of between 2 and 20.

3. The composition as claimed in claim 2, wherein the polyglycerol is diglycerol or a mixture of polyglycerols containing at least 50% by weight of diglycerol, triglycerol and tetraglycerol.

4. The composition as claimed in claim 1, wherein the polyglycerol represents 20% to 50% of the total weight of the solids.

5. The composition as claimed in claim 1, wherein the organic polycarboxylic acid contains 3 or 4 carboxyl groups.

6. (canceled)

7. The composition as claimed in claim 5, wherein the organic polycarboxylic acid is selected from a group consisting of citric acid, tricarballylic acid, 1,2,4-butanetricarboxylic acid, aconitic acid, hemimellitic acid, trimellitic acid and trimesic acid, 1,2,3,4-butanetetracarboxylic acid (BTCA) or pyromellitic acid.

8. The composition as claimed in claim 1, wherein the organic polycarboxylic acid represents 15% to 40% of the total weight of the solids.

9. The composition as claimed in claim 1, wherein the organic polycarboxylic acid represents 20% to 70% of the weight of the mixture formed by the polyglycerol and the organic polycarboxylic acid.

10. (canceled)

11. The composition as claimed in claim 1, wherein the esterification catalyst is sodium hypophosphite.

12. The composition as claimed in claim 1, wherein the esterification catalyst represents 2% to 10% of the total weight of the solids.

13. (canceled)

14. The composition as claimed in claim 1, wherein the plasticizer is a dialkyl ester of a fatty acid, a diester of isosorbide and fatty acid(s), an acetylated monoglyceride of a hydroxylated fatty acid, or a dimer-based polyester polyol.

15. The composition as claimed in claim 1, wherein the plasticizer represents 5% to 40% of the total weight of the solids.

16. The composition as claimed in claim 1, wherein the thickener is carboxyalkyl cellulose or hydroxyalkyl cellulose.

17. The composition as claimed in claim 1, wherein the thickener represents 2% to 20% of the total weight of the solids.

18. A paintable cloth comprising inorganic and/or organic yarns and the composition as claimed in claim 1.

19. The paintable cloth as claimed in claim 18, wherein the inorganic yarns are made of glass and the organic yarns are formed of at least one polymer or are made of plant fibers.

20. The paintable cloth as claimed in claim 18, wherein the paintable cloth has a surface weight of between 30 and 1000 g/m.sup.2.

21. The paintable cloth as claimed in claim 20, wherein the composition represents 15% to 40% of the weight of the paintable cloth.

Description

EXAMPLES 1 TO 10

[0070] An aqueous finishing composition is prepared that contains the constituents that appear in table 1, in amounts expressed as weight percentages.

[0071] For comparison purposes, two compositions containing succinic anhydride (comparative example C1) or succinic acid (comparative example C2) and a composition (Reference) containing the following constituents (as weight percentages) are also prepared:

TABLE-US-00001 Styrene/butyl acrylate copolymer 5.78 (Acronal S996 sold by BASF) Acrylic ester/acrylonitrile copolymer 3.40 (Acronal LN579S sold by BASF) Modified potato starch 1.66 (Amitrolit 8900 sold by Agrana) Wheat starch 0.58 Ammonium zirconium carbonate 0.80 (Arkophob AZCS sold by Auer Remy) Calcium carbonate 3.92 (Hydrocarb 90-GU sold by Omya) Silicone-based softener 0.37 (Cepolsoft SIL sold by Prochimica) Polyacrylate 1.65 (Appretan 2710 sold by Archroma) Water 81.84

[0072] The finishing composition according to these examples is used to coat a glass fabric having a basis weight equal to 110.2 g/m.sup.2 formed, as warp, of (twisted) glass textile yarns having a linear density equal to 140 tex with a warped density of 3 yarns per cm and, as weft, (non-twisted) glass yarns having a linear density of 330 tex and a weft density of 1.9 yarns per cm. The amount of finish on the woven fabric is given in table 1.

[0073] The application of the finishing composition is carried out by dip coating which consists in immersing the woven fabric in a tank containing said finishing composition then in depositing the woven fabric on a suction belt so as to eliminate the excess finish. The dip-coating application is equivalent to the screen-to-screen application mentioned above.

[0074] The woven fabric is then placed in a drying oven at 210 C. for 6 minutes, except for the woven fabric coated with the Reference composition which is treated at 200 C.

[0075] Table 1 collates the measurements of the tensile strength, after manufacture and after aging, and of the bending stiffness of the paintable cloths according to the invention (examples 1 to 10) and the comparative examples C1 and C2, relative to the Reference example.

[0076] Example 1 has the best mechanical performance, with higher tensile strength RTm and RTa than the Reference, and a stiffness that is also higher.

[0077] Example 10 has the best compromise with, in addition, an excellent water resistance, comparable to that of the Reference.

[0078] The comparative examples C1 and C2 using succinic acid (dicarboxylic acid) have low tensile strength RTm and RTa, insufficient stiffness (the paintable cloth has no strength) and no water resistance.

TABLE-US-00002 TABLE 1 Ex. 1 Ex. 2 Ex. 3 Ex. 4 Ex. 5 Ex. 6 Ex. 7 Ex. 8 Ex. 9 Ex. 10 C1 C2 Rf. Composition Diglycerol 3.09 3.41 3.53 2.83 3.98 4.13 4.20 4.39 3.66 2.13 3.78 3.45 Organic acid citric acid 3.79 3.30 3.13 2.31 2.44 BTCA 2.34 2.23 1.95 2.23 2.34 succinic anhydride 2.86 succinic acid 3.34 Sodium hypophosphite 0.50 0.55 0.57 0.46 0.64 0.67 0.68 0.71 0.68 0.67 0.61 0.56 Plasticizer acetylated monoglyceride 1.60 1.10 1.14 2.73 1.29 1.33 1.36 1.42 1.36 1.33 1.22 1.11 of hydroxystearic acid.sup.(1) Polyester polyol.sup.(2) 0.54 2.00 Thickener Carboxymethyl cellulose.sup.(3) 1.60 1.60 1.59 1.59 1.61 1.49 1.49 1.49 1.49 1.49 1.49 1.50 Water 90.00 90.00 90.00 90.00 90.00 90.00 90.00 90.00 90.00 90.00 90.00 90.00 Amount of finish (% by weight 32.4 33.1 33.4 33.0 31.4 31.9 32.6 30.8 32.6 31.9 28.9 31.4 34.9 of the paintable cloth) Tensile strength (N/5 cm) after manufacture RTm 140 66 47 30 28 47 33 28 55 71 11 8 96 after aging RTa 19 4 5 5 3 8 5 4 10 32 2 1 17 Bending stiffness (mN .Math. m) 6.43 3.33 2.33 1.91 1.42 2.90 2.23 1.71 2.55 5.08 0.67 0.57 5.48 Water resistance (s) n.d. 17 n.d. 3 5 10 7 2 >30 >30 0 0 >30 n.d.: not determined .sup.(1)Grindsted Soft-N-Safe sold by Danisco .sup.(2)Priplast 1901 sold by Croda .sup.(3)Finnfix 30000 P sold by CP KELCO