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.
Emulsion Polymerized Sec-Butyl Acrylate Latexes Suitable For Use As Pressure Sensitive Adhesives
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.
Process For The Preparation Of Expandable Microspheres
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.