Title: Aqueous coating compositions for asbestos-cement and the like

Abstract: Pigmented, in situ reduced zinc dichromate coatings on asbestos-cement and similar surfaces are made more reproducible in color by including as at least a portion of the reducing agent a hexitol or pentitol such as sorbitol, or a low alkanolamine, or mixtures of these. An acid like phosphoric acid that forms a water-insoluble calcium salt but does not precipitate the zinc can also be added to the coating formulation.

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Inventors: Schuster, Ludwig K. (Dresher, PA, US)
Tongyai, Singkata (Warrington, PA, US)

Application Number: 447013
Filing Date: 1974-02-28
Publication_date: 1976-03-30
Assignee: Pennwalt Corporation (Philadelphia, PA)
Primary Class(es): 524/247 427/223, 427/302, 427/314, 427/322, 427/372.2, 427/379, 427/380, 427/393.6, 428/391, 428/447, 524/556, 524/571
Other Classes:
US Patent Ref:

3094435	, 1963	Schuster et al.	117/132.
3421934	, 1965	Schuster et al.	117/123.
3472681	, 1969	Schuster et al.	117/126.
3516847	, 1970	Schuster et al.	117/46.

Other Refs:
Primary Examiner: Tillman, Murray
Assistant Examiner: DeBenedictis, Sr., T.
Attorney: