Early-rain-resistant joint-sealing compounds

In an early-rain-resistance join-sealing composition prepared by adding to a mixing vessel

• (a) from about 25 to about 90% by weight of an aqueous dispersion containing from about 40 to about 75% by weight of film-forming polymers or copolymers selected from the group consisting of ethylene-vinyl acetate, butadiene-styrene, vinyl acetate-maleic acid ester, silicone, urethane, vinyl acetate, methacrylic acid-chloroprene, isoprene, polysulfide, acrylate and ;
• polyacrylate;
• (b) adding to said vessel from 0 to about 1% by weight of a wetting agent,
• (c) adding to said vessel from 0 to about 20% by weight of a plasticizer,
• (d) adding to said vessel from 0 to about 10% by weight of a thickener, foam inhibitor, and pigment,
• (e) adding to said vessel from 0 to about 60% by weight of a filler, the improvement comprising
• (f) mixing up to about 1.5% by weight of a nonionic cellulose ether with water in a ratio of from about 1:2 to about 1:4, said nonionic cellulose ether being in retarded form and selected from the group consisting of hydroxyethyl cellulose, hydroxyethyl-methyl cellulose, hydroxypropyl-methyl cellulose and hydroxypropyl cellulose having a Brookfield viscosity in a 2% aqueous solution at about 20.degree. C. of at least about 5,000 mPa.s, based on the weight of said composition;
• and
• (g) adding the mixture prepared in step (f) to said vessel before a distinct increase in viscosity of said mixture prepared in step (f) occurs, followed by thorough mixing of the composition.

In a process for sealing a joint or gap in a building structure exposed to rain or water before a sealing compound is cured, comprising applying to said joint or gap an early-rain-resistance joint-sealing composition prepared by adding to a mixing vessel

• (a) from about 25 to about 90% by weight of an aqueous dispersion containing from about 40 to about 75% by weight of film-forming polymers or copolymers selected from the group consisting of ethylene-vinyl acetate, butadiene-styrene, vinyl acetate-maleic acid ester, silicone, urethane, vinyl acetate, methacrylic acid-chloroprene, isoprene, polysulfide, acrylate and polyacrylate;
• (b) adding to said vessel from 0 to about 1% by weight of a wetting agent,
• (c) adding to said vessel from 0 to about 20% by weight of a plasticizer,
• (d) adding to said vessel from 0 to 10% by weight of a thickener, foam inhibitor, and pigment,
• (e) adding to said vessel from 0 to about 60% by weight of a filler, the improvement comprising
• (f) mixing up to about 1.5% by weight of a nonionic cellulose ether with water in a ratio of from about 1:2 to about 1:4said nonionic cellulose ether being in retarded form and selected from the group consisting of hydroxyethyl cellulose, hydroxyethyl-methyl cellulose, hydroxypropyl-methyl cellulose and hydroxypropyl cellulose having a Brookfield viscosity in a 2% aqueous solution at about 20.degree. C. of at least about 5,000 mPa.s, based on the weight of said composition;
• and
• (g) adding the mixture prepared in step (f) to said vessel before a distinct increase in viscosity of said mixture prepared in step (f) occurs, followed by thorough mixing of the composition.