Susan M Dallessandro

US Patent:

45240116, Jun 18, 1985

Filed:

Nov 4, 1983

Appl. No.:

6/549364

Inventors:

Emmett L. Tasset - Clute TX
Susan M. Dallessandro - Midland MI
Warren F. Richey - Lake Jackson TX

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C11D 750

US Classification:

252171

Abstract:

Superior solder flux, e. g. , rosin flux, removal compositions are disclosed which have no flash point and are substantially non-corrosive toward aluminum. These compositions consist of about 0. 5 to less than 2% methanol with about 3 to 10% of one or more alcohols containing 2-5 carbon atoms the balance being an inhibited 1,1,1-trichloroethane, wherein percentages are based on volume of the total composition.

US Patent:

44381921, Mar 20, 1984

Filed:

Feb 14, 1983

Appl. No.:

6/465975

Inventors:

Wesley L. Archer - Midland MI
Vicki A. Lynn - Indianapolis IN
Susan M. Dallessandro - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

B08B 308
C11D 750
C23G 502

US Classification:

430329

Abstract:

An improved process for removing crosslinked photoresist polymer from printed circuit boards which comprises contacting the printed circuit board with methylene chloride containing from about 5 to about 10 volume percent of a mixture of methanol and methyl formate. Each additive must be present at a minimum concentration of one volume percent. Stabilizers for the methylene chloride, such as epoxides, may be present at amounts no greater than about 0. 5 volume percent.

US Patent:

45978905, Jul 1, 1986

Filed:

Feb 15, 1985

Appl. No.:

6/702289

Inventors:

Susan M. Dallessandro - Midland MI
Wesley L. Archer - Midland MI
Stephen P. Krupp - Lake Jackson TX

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

B08B 308
C07C 1742
C11D 750
C23G 5028

US Classification:

252153

Abstract:

Stable methylchloroform solvent compositions in combination with from about 3 to about 5 volume percent of 2-butanol and from about 1 to about 3 volume percent of 3-methyl-1-butyn-3-ol have been shown to be superior solvents for removing flux from circuit boards. Such compositions have no flash point and maintain excellent distribution of the components in the vapor and liquid sections of the defluxing apparatus.

US Patent:

44839170, Nov 20, 1984

Filed:

Jan 9, 1984

Appl. No.:

6/569093

Inventors:

Wesley L. Archer - Midland MI
Susan M. Dallessandro - Midland MI
Vicki A. Lynn - Indianapolis IN

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

B08B 308
C11D 750
C23G 502

US Classification:

430329

Abstract:

An improved process for removing crosslinked photoresist polymer from printed circuit boards which comprises contacting the printed circuit board with methylene chloride containing from about 5 to about 10 volume percent of a mixture of methanol and methyl formate. Each additive must be present at a minimum concentration of one volume percent. Stabilizers for the methylene chloride, such as epoxides, may be present at amounts no greater than about 0. 5 volume percent.