Additive composition used in the preparation of low air pore, plastic containing, hydraulically-setting binders

US4263191A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Herbert Eck · Burghausen, DE
• Paul-Gerhard Kirst
• Wilhelm Lechner · Burghausen, DE

Key dates

• Filing date: May 21, 1979
• Grant date: Apr 21, 1981
• Expiry date: May 21, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B28/02
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An additive composition used in the preparation of low air pore, plastic-containing, hydraulically-setting binders consisting essentially of a mixture of (1) an aqueous copolymer dispersion having a solids content of between 30% and 65% by weight, a glass transition temperature of the solid copolymer of between -10.degree. C. and +40.degree. C., and a K-value of the solid copolymer of from 35 to 80, which aqueous copolymer dispersion being produced from monomer units of vinyl chloride, vinyl acetate and one or more additional copolymerizable monomers selected from the group consisting of ethylene, vinyl alkanoates having from 8 to 18 carbon atoms in the alkanoyl, and (meth)acrylic acid esters with alkanols having 3 to 8 carbon atoms, by free-radical polymerization in the presence of from 1.5% to 5% by weight of protective colloids and from 0 to 3% by weight of nonionic surface-active agents, both based on the dispersion, with (2) from 0.3% to 3% by weight, based on the mixture of a defoamer mixture consisting of PA0 5 to 50 parts out of 100 parts of a dimethyl polysiloxane with 50 to 1000 mPa's, PA0 1 to 10 parts out of 100 parts of a flame-hydrolyzed silicon dioxide, and PA0 49 to…