# US 7,410,553 B2 · Building construction felt paper with biocide/anti-microbial treatment

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 7,410,553 B2
- Document ID: US7410553B2
- Status: Granted
- Kind: B2
- Application number: 11/071,577
- Filed: 2005-03-04
- Published: 2006-09-07
- Granted: 2008-08-12
- Earliest claimed: 2005-03-04
- Assignees: Atlas Roofing Corporation
- Inventors: Robert H. Blanpied; Freddie Lee Murphy
- Web page: https://patentgrep.com/patent/US7410553B2

## CPC

- D21H 11/14: Secondary fibres (working-up waste paper D21C5/02)
- D21H 21/36: Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents
- Y10T 442/20: Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
- Y10T 442/2525: Coating or impregnation functions biologically [e.g., insect repellent, antiseptic, insecticide, bactericide, etc.]
- D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A nonwoven web has a weight sufficient for construction industry use and comprises at least forty percent (40%) recycled waste paper. At least one surface of the web bears a biocide, e.g., has a biocide applied thereto. Preferably the weight of the web is greater than fifteen pounds per thousand square feet (15-lbs/MSF). Preferably the biocide is zinc pyrithione. The web preferably bears at least 50-grams of biocide per thousand square feet per side of said web. One example use of the web is as builders felt, with other uses including as a facer for a laminate board and for asphalt-impregnated webs. The biocide-bearing nonwoven web is specifically directed to use in building construction. One example use of the web is as builders felt, with other uses including as a facer for a laminate board and for asphalt-impregnated webs. Because building construction products must be tough, but priced as low as possible, this web is made largely from recycled waste paper (as opposed to virgin cellulose fiber, as a cost-reducing measure), and optionally clarifier sludge.

## Claims

### Claim 1

A process of making a nonwoven web comprising:
introducing a furnish comprising at least forty percent (40%) recycled waste paper into a paper forming machine to produce a web substrate having a weight sufficient for construction industry use, the web substrate being susceptible of being wound by a reel forming device; and then
applying a biocide to at least one surface of the web substrate.

### Claim 2 (depends on 1)

The process of claim 1, further comprising applying the biocide at a size press.

### Claim 3 (depends on 2)

An article produced by the process of claim 2.

### Claim 4 (depends on 1)

The process of claim 1, further comprising applying the biocide at a shower of a steam-heated dryer.

### Claim 5 (depends on 4)

An article produced by the process of claim 4.

### Claim 6 (depends on 1)

The process of claim 1, further comprising applying the biocide at a waterbox of a calender roll.

### Claim 7 (depends on 6)

An article produced by the process of claim 6.

### Claim 8 (depends on 1)

The process of claim 1, further comprising applying the biocide after a wet-press section.

### Claim 9 (depends on 8)

An article produced by the process of claim 8.

### Claim 10 (depends on 1)

The process of claim 1, further comprising applying the biocide at a coater.

### Claim 11 (depends on 10)

An article produced by the process of claim 10.

### Claim 12 (depends on 1)

An article produced by the process of claim 1.

### Claim 13 (depends on 1)

The process of claim 1, wherein the biocide comprises zinc pyrithione; ortho-Phenyl Phenol; or, a silicone quaternary amine with an active ingredient 3-trimethixysilylpropyldimethyloctadecyl ammonium chloride.

### Claim 14 (depends on 1)

The process of claim 1, wherein the web comprises builders felt.