FORFARANDE FOR FRAMSTELLNING AV REDISPERGERBARA PULVERFORMIGA PLASTER GENOM SPRAYNING AV VATTENHALTIGA PLASTDISPERSIONER INNEHALLANDE VATTENLOSLIGA SULFONATGRUPPHALTIGA KONDENSATIONSPRODUKTER AV MELAMIN OCH M.M.

摘要

1362830 Cement compositions WACKERCHEMIE GmbH 6 Oct 1971 [6 Oct 1970] 46545/71 Heading C1H [Also in Division C3] Hydraulically setting compositions contain 2 to 25% of a pulverulent plastic material obtained by spraying an aqueous dispersion of the plastic containing a condensate of melamine and formaldehyde, containing sulphonic acid or salt groups. In examples ethylene-vinyl acetate copolymers are obtained in powder form and compounded with Portland cement and sand. An anti-foaming agent, such as a silicone or alcohol on an inert carrier, may desirably be employed.