Roland E Gunderman

US Patent:

41088069, Aug 22, 1978

Filed:

Dec 21, 1973

Appl. No.:

5/427298

Inventors:

William E. Cohrs - Midland MI
Roland E. Gunderman - Clare MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

B01F 1500

US Classification:

521 54

Abstract:

Expandable synthetic resinous microspheres are expanded in a matrix by heating under pressure to at least a foaming temperature and permitting the microspheres to expand at a lower pressure.

US Patent:

47134127, Dec 15, 1987

Filed:

Aug 2, 1985

Appl. No.:

6/762083

Inventors:

Ralph G. Czerepinski - Midland MI
Roland E. Gunderman - Clare MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08L 3100
C08L 3300
C08L 3500

US Classification:

524833

Abstract:

An emulsion polymerized latex composition suitable for use as a pressure sensitive adhesive having from about 90 to about 99. 5 percent by total weight polymer of sec-butyl acrylate and from about 10 to about 0. 5 percent by total weight polymer prepared from monomers selected from the group consisting of alkyl esters of acrylic and methacrylic acids wherein the alkyl chain has up to about 20 carbon atoms, monovinylidene aromatics, and ethylenically unsaturated carboxylic acids. Additionally the latex composition can include from about 1 to about 90 percent by weight on a total solids basis of a tackifying resin. Adhesives prepared with the subject latex compositions provide an excellent balance of adhesive properties, i. e. , peel and shear adhesion.

US Patent:

40161102, Apr 5, 1977

Filed:

Jul 26, 1972

Appl. No.:

5/275268

Inventors:

William E. Cohrs - Midland MI
Roland E. Gunderman - Clare MI
William A. Crozier - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08J 920

US Classification:

260 25B

Abstract:

Uniformity in the polymerization of expandable microspheres disclosed in U. S. Pat. 3,615,972 is improved by replacing a copolymer of adipic acid and diethanol amine with citric acid.