Base interlining, methods for their manufacture and application thereof

Abstract

The invention relates to a novel binder system and its use for bonding textile fabrics as well as products containing such bonded textile fabrics. The materials according to the invention are suitable for manufacturing base interlinings which may be used for manufacturing base interlinings for sarking, roofing and sealing membranes, particularly for manufacturing coated sarking, roofing and sealing membranes.

Claims

1. A binder system comprising: a) 10 to 90 wt % (dry mass) of an aqueous dispersion of polymers based on conjugated aliphatic dienes and vinyl aromatic compounds; b) 90 to 10 wt % (dry mass) starch, wherein the starch comprises a mixture of amylose and amylopectin and has a molecular weight M.sub.w between 510.sup.4 and 110.sup.7; and c) 0 to 10 wt % (dry mass) additives; with the figures for the percentage by weight relating to the dry mass of the binder system; wherein a textile fabric is bonded with the binder system, wherein the starch replaces a formaldehyde-containing binder component, and wherein the polymers are emulsion polymers consisting of: a) 20 to 80 parts by weight of conjugated aliphatic dienes, b) 20 to 80 parts by weight of vinyl aromatic compounds, c) 0 to 10 parts by weight of ethylenic unsaturated carboxylic acids and/or dicarboxylic acids, d) 0 to 20 parts by weight of ethylenic unsaturated carboxylic acid nitriles, manufactured in the presence of water, emulgators and water soluble initiators.

2. The binder system according to claim 1, characterized in that the dispersions contain maximally 5 parts by weight of ethylenic unsaturated carboxylic acids and/or discarboxylic acids or derivatives of the acids in polymerized form.

3. The binder system according to claim 1, characterized in that the dispersions contain no ethylenic unsaturated carboxylic acids and/or dicarboxylic acids or derivatives of the acids mentioned above in polymerized form.

4. The binder system according to claim 1, characterized in that the dispersions contain maximally 5 parts by weight of ethylenic unsaturated carboxylic acid nitriles in polymerized form.

5. The binder system according to claim 1, characterized in that the dispersions contain no ethylenic unsaturated carboxylic acid nitriles in polymerized form.

6. The binder system according to claim 1, characterized in that the conjugated aliphatic dienes (component a) are butadiene, isoprene, pentadiene-1.3, dimethylbutadiene and/or cyclopentadiene.

7. The binder system according to claim 1, characterized in that the vinyl aromatic compounds (component b) are styrene, a-methylstyrene vinyl acetate and/or vinyltoluene.

8. The binder system according to claim 1, wherein the aqueous dispersion has a polymer solids content between 30 and 70 wt %.

9. The binder system according to claim 1, characterized in that the viscosity of the dispersions is between 10 and 2200 mPa.Math.s.

10. The binder system according to claim 1 characterized in that the dispersions are anionic dispersions.

11. The binder system according to claim 1 characterized in that the dispersions are partly cross-linked and/or bathotonic and/or thermally cross-linkable dispersions.

12. The binder system according to claim 1, characterized in that the starch is natural or modified or starch derivatives.

13. The binder system according to claim 1, characterized in that the starch is extracted from vegetable raw materials.

14. The binder system according to claim 1, characterized in that the starch is of native vegetable origin or is chemically modified, enzymatically extracted, of recombinant origin or is manufactured by biotransformation (biocatalysis).

15. The binder system according to claim 1, wherein the additives comprise a flame-retardant additive.

16. The binder system according to claim 1, wherein the additives comprise an antistatic agent.

17. The binder system according to claim 1, wherein the starch consists of amylose and amylopectin.

18. The binder system according to claim 14, wherein the starch is a chemically modified starch of the group consisting of starch esters, acetates, phosphates, sulfates, nitrates, starch ethers, oxidized starches, carboxy starch, and starches degraded by persulfate.

19. The binder system according to claim 1, wherein the binder system increases the dimensional stability of the textile fabric by at least 20% in a cross direction compared with a conventional styrene-butadiene binder system that lacks starch.

20. The binder system according to claim 1, wherein the binder system is formaldehyde-free.

Description

EXAMPLES

(1) The following table 1 shows a comparison of the textile fabrics bonded with the binder system according to the invention against the respective single components of the binders.

(2) A spunbonded non-woven based on polyethylene terephthalate (PET-spunbond) with a weight per area unit of 180 g/m.sup.2 (Type JM33/180) is examined.

(3) Example 1 shows a standard binder system based on SBR and urea binder, example 2 shows a binder system based on urea and acrylate, example 3 shows a binder system according to the invention, example 4 shows a binder system based on starch and acrylate, example 5 shows a binder system based on starch. Typically the liquor concentration is 15-40% (i.e. solid matter in liquor)

(4) TABLE-US-00001 Test no. 1 2 3 4 5 SBR-dispersion 90 40 urea resin 10 10 acrylate 90 40 dispersion starch 60 60 100 Set application 20 20 20 20 20 (% weight of raw non- woven) [%] Maximum 56 59 57 51 46 longitudinal tensile force [daN/5 cm] Maximum longitudinal tensile 25 19 27 n.t. 31 force, hot [daN/5 cm] Maximum cross tensile force 47 48 45 36 36 [daN/5 cm] Longitudinal TDS [%] 1.8 1.9 1.3 1.6 0.8 Cross TDS [%] 1.6 1.8 1.4 1.7 1.3 VW-Test [mg/kg FA] ~400 ~400 ~30 ~30 <10 Water suction [mm] 80 72 72 59 66