Mineral wool paper

• US 3,952,130 A
• Filed: 07/17/1974
• Issued: 04/20/1976
• Est. Priority Date: 11/17/1972
• Status: Expired due to Term

• Current Assignee: United States Gypsum Company (GEBR Knauf Verwaltungsgesellschaft KG)
• Original Assignee: United States Gypsum Company (GEBR Knauf Verwaltungsgesellschaft KG)
• Inventors: Nason, Stephen G.
• Primary Examiner(s): Bashore, S. Leon
• Assistant Examiner(s): Chin, Peter
• Application Number:
  US05/489,348
• Time in Patent Office: 643 Days
• Field of Search: 162/152, 162/145, 162/124, 162/104, 156/39, 156/71, 428/224, 428/538, 428/539, 428/288, 428/289, 428/332
• US Class Current: 428/332
• CPC Class Codes: C04B 2111/0062 Gypsum-paper board like materials
• CPC Class Codes: C04B 28/14 containing calcium sulfate cements gypsum-paper plates E04C
• CPC Class Codes: D21H 13/38 siliceous
• CPC Class Codes: Y10T 428/26 Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension

Abstract

A paper product comprising mineral fibers and a nonfibrous, highly refined gel binder, the product having a thickness no greater than about 0.080 inches and an apparent specific gravity of between about 0.25 and about 0.85. The product may be a sheet no thicker than about 0.012 inches, or a paperboard.

Claims

1. A gypsum wallboard comprising a rehydrated gypsum core and a paper product covering being bonded to at least a surface of said core, said paper product comprising mineral fibers and a gel binder, the binder being characterized as a highly refined, nonfibrous cellulosic gel having a standard TAPPI drainage time of between about 300 to about 1200 seconds per 1.2 gram sheet weight, and a shrinkage value of at least 20% when roller after draining into a cylinder and dried unrestrained at about 250°

F, the paper product having a thickness not exceeding about 0.080 inches, and an apparent specific gravity of between about 0.25 and about 0.85, said gel being present in an amount from about 10% to about 50% by weight of total gel fibers.

2. The product as defined in claim 1, wherein said fibers in the paper product are present in an amount of between about 50% and about 90% of the weight of the dry solids of the paper product, the remainder consisting essentially of said gel.

3. The product as defined in claim 2, wherein said fibers in the paper product are slag wool fibers.

4. The product as defined in claim 1, and further including cellulosic fibers present in an amount of between about 30% and about 85% of the weight of the total dry solids of the paper product.

5. The product as defined in claim 4, wherein said gel is present in the paper product in an amount comprising at least about 5% of the weight of the total dry solids of the paper product.

6. The product as defined in claim 1, wherein said gel is present in an amount comprising at least about 10% of the weight of the total dry solids of the paper product.

7. A product wherein the paper product as defined in claim 1, has a thickness which does not exceed about 0.012 inches.