Claims
- 1. A composition for manufacturing a flexible and porous product in sheet form by the wet method, said producing having a Bendtsen porosity greater than 1000 ml/min for a thickness of 1 mm which composition comprises:
- between 20% and 80% by dry weight of at least one elastomer powder, said powder having a granulometry of from 40 to about 500 .mu.m;
- between 10% and 70% by dry weight of fibers of length which is less than 10 mm, said fibers being selected from the group consisting of mineral fiber, natural fiber and mixtures thereof;
- between 0% and 20% by dry weight of at least one binding agent;
- between 0.1% and 5% by dry weight of a flocculating agent and/or of at least one retention agent; and
- between 0% and 40% by dry weight of at least one filler which may be inorganic or organic;
- wherein the total of the above components is 100%.
- 2. A flexible and porous sheet product obtained by the wet method from the composition according to claim 1 having a porosity greater than 1000 ml/min for a thickness of 1 mm.
- 3. A flexible and porous sheet product obtained by the wet method from the composition according to claim 1.
- 4. A sheet product according to claim 2, characterized in that said fibers comprise a mixture of glass fibers and of cellulose fibers.
- 5. A sheet product according to claim 2, characterized in that said elastomer powder comprises vulcanized recovery rubber.
- 6. A sheet product according to claim 2, wherein the elastomer powder comprises a mixture of vulcanized rubber powder; the binding agents are of the latex type; and the flocculating agent is a cationic flocculating agent.
- 7. A sheet product according to claim 6, characterized in that it comprises:
- about 70 to 75% by dry weight of a mixture of vulcanized rubber powder;
- about 15 to 20% by dry weight of fibers;
- about 8 to 12% by weight of at least one latex type binding agent; and about 0.3 to 0.5% by weight of at least one cationic flocculating agent;
- wherein the total of the above components is 100%.
- 8. A process for the manufacture of a sheet product as defined according to claim 2, characterized in that it comprises the following steps:
- preparing an aqueous solution of a mixture containing:
- 20 to 80% by weight of an elastomer in powder form, of mean granulometry from about 40 to about 500 .mu.m; and
- 10 to 70% by weight of fibers of length less than 10 mm; said fibers being selected from the group consisting of mineral fiber, natural fiber and mixtures thereof;
- adding to the suspension a first quantity of a flocculating agent;
- adding between 0 to 20% by weight of a binding agent to the suspension containing the flocculating agent; adding additives;
- then adding a second quantity of a flocculating agent and/or a retention agent; depositing the resulting aqueous suspension on a screen;
- draining the suspension deposited on the screen in order to form a wet sheet; and drying the sheet in order to obtain the product in sheet form.
- 9. A sheet product according to claim 2 wherein the fiber is a mixture consisting of mineral fiber and cellulosic fiber.
- 10. A sheet product according to claim 2 wherein the elastomer powder is selected from the group consisting of vulcanized or non-vulcanized natural rubber and synthetic rubber.
- 11. A sheet product according to claim 9, wherein said cellulosic fibers are refined cellulosic fibers.
- 12. A composition according to claim 1 wherein the mixture is an intimate mixture.
- 13. A sheet product according to claim 2 wherein the mixture is an intimate mixture.
- 14. A composition according to claim 1 wherein the elastomer powder has granulometry between 40 and 300 .mu.m.
- 15. A composition according to claim 1 wherein the elastomer powder represents more than 28.6% with respect of the fibers by dry weight.
- 16. A sheet product according to claim 2, having an internal cohesion of at least 219 Scott Bond units.
- 17. A sheet product according to claim 10 wherein the synthetic rubber is selected from the group consisting of BUNA (butadiene polymer), BUNA S or SBR (styrene-butadiene copolymer), acrylic butadiene-nitrile copolymers, polychloroprenes (2-chloro butadiene copolymers), chlorosulfonated polyethylenes, polyisobutylenes, ethylene-propylene, isobutylene-butadiene, isoprene copolymers, polyacrylic esters, fluorinated derivatives of rubber, silicon rubbers, and polyurethane elastomers.
- 18. A sheet product according to claim 10 wherein the synthetic rubber is selected from the group consisting of BUNA (butadiene polymer), BUNA S or SBR (styrene-butadiene copolymer), acrylic butadiene-nitrile bipolymers, polychloroprenes (2-chloro butadiene copolymers), chlorosulfonated polyethylenes, polyisobutylenes, ethylene-propylene, isobutylene-butadiene, isoprene copolymers, polyacrylic esters, fluorinated derivatives of rubber, silicon rubbers, and polyurethane elastomers.
Priority Claims (2)
Number |
Date |
Country |
Kind |
88 12854 |
Sep 1988 |
FRX |
|
88 13994 |
Oct 1988 |
FRX |
|
Parent Case Info
This application is a continuation of application Ser. No. 07/671,697, filed Mar. 29, 1991 now abandon.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/FR89/00499 |
9/28/1989 |
|
|
3/29/1991 |
3/29/1991 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO90/03262 |
4/5/1990 |
|
|
US Referenced Citations (6)
Non-Patent Literature Citations (1)
Entry |
Bost, "Matiere Plastiques-Chimie-Applications," Technique & Documentation, Apr. 1974, pp. 188-189. |
Continuations (1)
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Number |
Date |
Country |
Parent |
671697 |
Mar 1991 |
|