Alan T Brown

US Patent:

56537956, Aug 5, 1997

Filed:

Nov 16, 1995

Appl. No.:

8/558683

Inventors:

Alan J. Brown - Vancouver WA

Assignee:

Columbia River Carbonates - Woodland WA

International Classification:

C09C 102

US Classification:

106469

Abstract:

A method is disclosed for producing bulking and opacifying pigments for filling paper by the selective aggregation of fine particles in an anionically or cationically dispersed slurry, such that an aggregated structure is formed which contains within it a labyrinth of internal voids or pores. The aqueous slurry is formed at one to thirty percent solids. A low molecular weight agent of opposite ionic charge is then added to the slurry to selectively aggregate the fine particles present. The resultant aggregates are of larger mean particle size than the feed material and contain little or no fine and colloidal particles. The net charge present on the aggregated particles is lower than that of the feed material.

US Patent:

56767480, Oct 14, 1997

Filed:

Dec 29, 1995

Appl. No.:

8/581056

Inventors:

Alan J. Brown - Vancouver WA

Assignee:

Columbia River Carbonates - Woodland WA

International Classification:

C09C 102

US Classification:

106469

Abstract:

A method for producing bulking and opacifying kaolin fillers for filling cellulosic products is disclosed. An aqueous slurry of anionically dispersed kaolin particles is formed at 1 to 30% solids. A low-molecular-weight cationic aggregating agent is then added to the dispersed slurry to selectively aggregate fine and ultra-fine particles. The resultant aggregates are of larger mean particle size than the feed material and contain little or no fine and ultra-fine or colloidal particles. The net charge present on the aggregated particles is lower than that of the feed material. The aggregated structure contains within it a labyrinth of internal voids or pores. These mineral aggregates are then of a suitable size and surface charge to be retained well in a fiber web, and provide added bulk and opacity to the cellulosic products.

US Patent:

52980669, Mar 29, 1994

Filed:

Feb 22, 1993

Appl. No.:

8/020982

Inventors:

Dickey S. Shurling - Sandersville GA
Alan J. Brown - Vancouver WA
E. Wayne Andrews - Sandersville GA

Assignee:

ECC International Inc. - Atlanta GA

International Classification:

C09C 312
C08K 334
C08K 908
C08K 906

US Classification:

106487

Abstract:

An improved process for producing a aggregated kaolin pigment having desired physical and optical characteristics when used as a coating, filler or pigment in paper. The aggregated pigment is produced by contacting a substantially dry fine particle size kaolin with a previously hydrolyzed organic silicon compound, such as hydrolyzed tetraethoxysilane, and then recovering the aggregated kaolin pigment.

US Patent:

56767463, Oct 14, 1997

Filed:

Apr 11, 1995

Appl. No.:

8/419890

Inventors:

Alan J. Brown - Vancouver WA

Assignee:

Columbia River Carbonates - Woodland WA

International Classification:

C09C 102

US Classification:

106465

Abstract:

A process is provided for the selective aggregation of the fine and ultrafine particles present in an anionically or cationically dispersed mineral pigment slurry, such that an aggregated structure is formed which contains within it a labyrinth of internal voids or pores, which collectively function as light scattering centers. The aggregates are formed from an assemblage of fine mineral particles, interconnected or bonded together with small quantities of a cationic or anionic polymer or agent of low molecular weight. The resultant aggregates are of larger mean particle size than the feed material and contain little or no fine and colloidal particles. The net charge present on the aggregated particles is lower than that of the feed material. These mineral aggregates are then of a suitable size and surface charge to be retained well in a fiber web by a combination of filtration retention and adsorption retention, and provide added bulk and opacity to the finished sheet of paper. The high solids, aggregated, products of this invention can also be used to enhance the optical properties, smoothness, printing properties and surface coverage of coated paper and paper board.

US Patent:

56767471, Oct 14, 1997

Filed:

Dec 29, 1995

Appl. No.:

8/580762

Inventors:

Alan J. Brown - Vancouver WA

Assignee:

Columbia River Carbonates - Woodland WA

International Classification:

C09C 102

US Classification:

106465

Abstract:

A method for producing structured calcium carbonate pigments for coating paper is disclosed. An aqueous slurry of anionically dispersed calcium carbonate particles is formed at 1 to 30 percent solids. A low-molecular-weight cationically charged aggregating agent is then added to the slurry to selectively aggregate fine and ultra-fine particles. The resultant aggregates are of larger mean particle size than the mixture of particles in the original slurry and contain little or no fine and colloidal particles. The net charge present on the aggregated particles is lower than that of the original mineral particles. The low solids suspension of the aggregated mineral particles is then dewatered, or increased in solids to form a slurry with a solids content greater than 60 percent by weight.