Non-asbestos flooring felt containing particulate inorganic filler, a mixture of fibers and a binder

• US 4,373,992 A
• Filed: 03/31/1981
• Issued: 02/15/1983
• Est. Priority Date: 03/31/1981
• Status: Expired due to Fees

• Current Assignee: Tarkett AB (Tarkett Holding GmbH)
• Original Assignee: Tarkett AB (Tarkett Holding GmbH)
• Inventors: Bondoc, Alfredo A.
• Primary Examiner(s): CANNON, JAMES
• Application Number:
  US06/249,322
• Time in Patent Office: 686 Days
• Field of Search: 428/281, 428/44, 162/145, 162/146, 162/168.4, 162/169, 162/183, 162/181.1, 162/181.4, 162/181.6, 162/181.8
• US Class Current: 162/145
• CPC Class Codes: D06N 7/0055 Particulate material such as cork, rubber particles, reclaimed resin particles, magnetic particles, metal particles, glass beads
• CPC Class Codes: D21H 13/14 Polyalkenes, e.g. polystyrene polyethylene
• CPC Class Codes: D21H 13/40 vitreous, e.g. mineral wool, glass fibres
• CPC Class Codes: D21H 21/52 Additives of definite length or shape
• CPC Class Codes: D21H 23/765 Addition of all compounds to the pulp
• CPC Class Codes: Y10T 428/16 Two dimensionally sectional layer
• CPC Class Codes: Y10T 442/53 Including particulate material other than fiber

Abstract

Flooring felt containing glass fibers, cellulosic fibers, synthetic fibers, particulate inorganic filler, latex binder and calcium hydroxide.

Claims

1. Sheet type felt comprising on a dry basis;

(a) between about 1 and about 10 wt. % glass fibers;

(b) between about 3 and about 25 wt % cellulosic fibers;

(c) between about 3 and about 20 wt % synthetic organic fibers;

(d) between about 3 and about 70 wt % particulate inorganic filler;

(e) between about 10 and about 30 wt % latex binder;

(f) between about 3 and about 80 wt % calcium hydroxide; and

(g) between about 0.1 and about 10 pounds polymeric flocculating agent per ton of felt.

2. Felt according to claim 1 wherein at least a portion of the latex and calcium hydroxide is present in the form of precipitation product uniformly distributed onto particles of filler and onto fibers.

3. Felt according to claim 1 which is essentially free of asbestos.

4. Felt according to claim 2 wherein the synthetic fiber comprises polyolefin.

5. Felt according to claim 4 wherein the polyolefin is fibrillated polyproylene.

6. Felt according to claim 1 wherein the glass fibers have average diameters in excess of about 3 microns and fiber lengths between about 0.5 and about 6 mm.

7. Felt according to claim 1 wherein the filler has an average particle size less than about 30 microns.

8. Felt according to claim 7 wherein the filler comprises kaolin clay.

9. Felt according to claim 1 wherein the filler comprises calcium hydroxide.

10. Felt according to claim 1 wherein the flocculant is polyacrylamide.

11. Felt according to claim 1 wherein the latex binder comprises anionic synthetic rubber.

12. Felt according to claim 1 wherein the latex comprises carboxylated styrene-butadiene rubber.

13. Felt according to claim 1 wherein:

a. the synthetic fiber comprises fibrillated polyolefin;

b. the glass fibers have average diameters in excess of 3 microns and fiber lengths between about 0.5 and about 6 mm;

c. the filler has an average particle size less than about 30 microns;

d. the latex binder comprises anionic synthetic rubber; and

e. the flocculating agent comprises polyacrylamide.

14. Felt according to claim 1 which also includes at least about 5 weight percent on a dry basis of process mineral fiber.

15. Felt according to claim 14 wherein the mineral fiber has diameter between about 1 and about 10 micron and aspect ratios between about 40 to 1 and about 60 to 1.