Abstract: An aqueous, alkaline, inorganic composition, comprising water-soluble alkali metal silicate and zinc hydroxychloride, is used to coat substrates normally infested by algae, such as silicate-containing building material, e.g., concrete roofing tiles, to prevent or minimize algal infestation on said substrates, said algae otherwise imparting a dark, unsightly appearance thereto.
Type:
Grant
Filed:
May 7, 1973
Date of Patent:
May 9, 1978
Assignee:
Minnesota Mining and Manufacturing Company
Abstract: Polyfunctional poly(perfluoroalkylene oxide) compounds, such as compounds of the formulaA--CF.sub.2 O(CF.sub.2 CF.sub.2 O).sub.m (CF.sub.2 O).sub.n CF.sub.2 --A'where A and A' are reactive radicals containing a polymerizable functional group, e.g., hydroxyl, are provided, such compounds being useful as monomers in the preparation of polymeric materials, e.g., polyurethanes, possessing unusual low temperature stability and resistance to solvents.
Type:
Grant
Filed:
August 28, 1975
Date of Patent:
April 18, 1978
Assignee:
Minnesota Mining and Manufacturing Company
Inventors:
Ronald A. Mitsch, Joseph La Mar Zollinger
Abstract: Transparent, smooth, fracture resistant, discreet, refractory oxide fibers of homogeneous chemical composition comprising 96 to 100 weight percent of a mixture or chemical combination of 67 to 77 parts by weight alumina and 23 to 33 parts by weight silica, said fibers having a predominant polycrystalline phase of mullite, transitional alumina, or a mixture of both, said refractory fibers being made by fiberizing a viscous liquid of oxide precursors comprising a silica sol and a water dispersible alumina sol or water soluble or dispersible organic aluminum salt, and drying, collecting, and calcining the resulting green fibers.
Type:
Grant
Filed:
May 4, 1976
Date of Patent:
September 13, 1977
Assignee:
Minnesota Mining and Manufacturing Company
Abstract: Bis(fluoroaliphaticsulfonyl)imides, in active or latent form, are used as catalysts for the polymerization of cationic sensitive monomers, e.g., epoxy resins.
Type:
Grant
Filed:
June 9, 1975
Date of Patent:
June 21, 1977
Assignee:
Minnesota Mining and Manufacturing Company