IP Library › Granted Patent US 6,875,504
Granted Patent B2
US 6,875,504 · App. 10/202,033 · Granted Apr 5, 2005

Backing sheet for surface covering

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Quick Facts
Patent No.
US 6,875,504
App. No.
10/202,033
Filed
Jul 24, 2002
Granted
Apr 5, 2005
Kind
B2
Examiner
LE, HOA T
Art Unit
1773
USPC
428/323
Abstract

A stain-adsorbing backing sheet for use with a decorative surface covering; a decorative surface covering comprising a stain-adsorbing backing sheet; and a method for forming a stain-adsorbing backing sheet for a decorative surface covering. The backing sheet comprises an additive which is effective in adsorbing a stainant that comes into contact with the backing sheet and which is present in an amount effective to reduce the degree of staining which tends to be visible in the top surface of the covering. The additive is preferably an adsorbing material that does not affect adversely the visual characteristics of the sheet and surface covering.

Claims (14)

1. A backing sheet for use with a decorative surface covering capable of becoming stained and comprising an additive effective for adsorbing a stainant in said backing sheet and which additive does not affect the visual characteristics of the sheet.

2. A backing sheet according to claim 1 wherein the sheet comprises about 0.001 to about 5 wt. % of said additive.

3. A backing sheet according to claim 1 wherein the sheet comprises about 0.005 to about 0.1 wt. % of said additive.

4. A backing sheet according to claim 1 wherein said additive does not affect the color characteristics of the sheet.

5. A backing sheet according to claim 1 wherein said additive comprises activated charcoal.

6. A backing sheet according to claim 1 wherein said additive comprises activated alumina.

7. A backing sheet according to claim 1 wherein said additive comprises fumed silica.

8. A backing sheet for use with a decorative surface covering capable of becoming stained, said backing sheet comprising as an additive 0.001 to about 5 wt. % activated charcoal.

9. In a backing sheet for a decorative surface covering capable of becoming stained, the improvement comprising the presence in the sheet of a sufficient amount of an additive which is effective for substantially retaining in the sheet a stainant and which does not affect the visual characteristics of the sheet.

10. A decorative surface covering comprising an overlying decorative layer capable of becoming stained and an underlying backing sheet which includes an additive which is effective in adsorbing a stainant which comes into contact with said backing sheet and which additive does not affect the visual characteristics of the sheet.

11. A backing sheet for use with a decorative surface covering capable of becoming stained and comprising one or more of activated charcoal, activated alumina and fumed silica.

12. A poly(vinyl chloride)-based floor covering comprising the backing sheet of claim 11 .

13. In a process for forming a backing sheet for a surface covering, in which the sheet is formed from an aqueous dispersion of solids, the improvement comprising adding to the aqueous dispersion an additive which is effective in adsorbing a stainant which comes into contact with the sheet and which additive does not affect the visual characteristics of the sheet.

14. A method for forming a stain-adsorbing backing sheet for a decorative surface covering comprising preparing an aqueous dispersion of solids and including in said dispersion an additive which does not affect the visual characteristics of the sheet and which is present in an amount sufficient to adsorb a stainant which comes into contact with said sheet.