Wilson Stuart Bigham

US Patent:

55165737, May 14, 1996

Filed:

Sep 26, 1994

Appl. No.:

8/312464

Inventors:

Billy L. George - Hudson, both of WI
Stefan A. Babirad - Hudson WI
Vincent J. Laraia - Woodbury MN
Wilson S. Bigham - Cottage Grove MN

Assignee:

Minnesota Mining and Manufacturing Company - Saint Paul MN

International Classification:

D06N 500

US Classification:

428143

Abstract:

An asphalt-based roofing product includes an asphalt-based substrate such as asphalt-saturated fiberglass or cellulose felt, a non-asphalt, thermoplastic, water-resistant adhesive on the surface of the asphalt-based substrate, and a plurality of roofing granules embedded in the asphalt such that the adhesive provides an interface between the asphalt and roofing granules. The adhesive is present in an amount sufficient to improve the adhesion of the roofing granules to the asphalt.

US Patent:

53383680, Aug 16, 1994

Filed:

Sep 22, 1993

Appl. No.:

8/125333

Inventors:

Robert B. Fletcher - Peterborough, CA
Wilson S. Bigham - Woodbury MN
Phyllis F. Albert - River Falls WI

Assignee:

Minnesota Mining and Manufacturing Company - St. Paul MN

International Classification:

C23G 502
B08B 700
B08B 304

US Classification:

134 40

Abstract:

A method for deoiling oil residues from surfaces of inorganic particles each having pigment in an outer layer thereon, comprising contacting the surfaces with a deoiling solution comprising a mixture of monocyclic terpene and aliphatic petroleum distillates in an amount and manner effective to wet substantially all the surfaces of the inorganic particles, whereby the deoiling solution removes substantially all the oil residues from the surfaces of the inorganic particles. In a preferred embodiment, there is a method for deoiling oil residues from surfaces of inorganic particles each having pigment in an outer layer thereon including introducing the inorganic particles into a structure having a wall portion which defines a receptacle having upper and lower openings, the structure including a porous support member having a pore size which permits the passage of liquid but not the inorganic particles located in the receptacle between the first opening and the second opening to define a particle holding chamber, and, then, deoiling the inorganic particles by introducing into the upper opening a deoiling solution comprising a mixture of monocyclic terpene and aliphatic petroleum distillates, and, then, rinsing the deoiled inorganic particles with water and drying the rinsed inorganic particles, in that order.