C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
400/1305, 400/30
C09K 3/00 (2006.01) C04B 24/26 (2006.01) C04B 28/02 (2006.01)
Patent
CA 1122340
ABSTRACT OF THE DISCLOSURE 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°C and +40°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 copoly- merizable 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 de- foamer mixture consisting of 5 to 50 parts out of 100 parts of a dimethyl polysiloxane with 50 to 1000 mPa's, 1 to 10 parts out of 100 parts of a flame-hydrolyzed silicon dioxide, and 49 to 94 parts out of 100 parts of an ethylene/oxide propylene oxide block copolymer with a molecular weight of from 500 to 10,000, containing from 10% to 60% by weight of ethylene oxide units. With the above additive composition, it is now possible to produce hydraulically setting, plastic-containing binding materials which have a very low content of air-filled pores, and thus give better strength values of the set, plastic-containing, hydraulically-setting binding materials. -A-
328004
Eck Herbert
Kirst Paul-Gerhard
Lechner Wilhelm
Macrae & Co.
Wacker-Chemie Gmbh
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