Ready mixed setting-type joint compound, and method of...

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 11/06 (2006.01) C04B 24/26 (2006.01) C04B 28/14 (2006.01) C04B 40/06 (2006.01)

Patent

CA 2196233

A process for the production of a ready-mixed setting-type joint compound includes the use of calcium sulfate hemihydrate, water, and a set-retarding agent. The retarder includes a polymer composition including acrylic acid and acrylamide monomer units, for example a copolymer (or a mixture of copolymers) of acrylic acid and acrylamide or a blend of a homopolymer of acrylic acid and a homopolymer of acrylamide. The joint compound can be combined with an accelerator including a metallic salt. The joint compound of the invention can be formulated either as a lightweight joint compound or as a conventional weight joint compound. The joint compounds provide short setting times, reduced shrinkage, reduced preparation time, and beneficial application properties.

Un procédé de production d'un composé à joint de type à durcissement prêt à l'emploi comprend l'utilisation de sulfate de calcium hémihydraté, d'eau et d'un retardateur de durcissement. Le retardateur de durcissement comprend une composition polymérique constituée de monomères d'acide acrylique et d'acrylamide, par exemple, un copolymère (ou un mélange de copolymères) d'acide acrylique et d'acrylamide ou un mélange d'un homopolymère d'acide acrylique et d'un homopolymère d'acrylamide. Le composé à joint peut être combiné avec un accélérateur contenant un sel métallique. Le composé à joint de la présente invention peut être formulé comme composé à joint léger ou comme composé à joint traditionnel. Les composés à joint présentent un temps de durcissement court, un retrait réduit, un temps de préparation réduit et des propriétés d'application avantageuses.

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