Hercules Corporation

Aqualon Company

Other

Thomas J Podlas

Charles L Burdick

Kirill Bakeev

Sung G Chu

Thomas G Majewicz

Teng-Shau Young

Arthur L Anttila

Arthur H Knechtel

A joint compound with improved crack resistance is formed by combining water, a filler such as calcium carbonate, a latex emulsion binder, a thickening system such as methylhydroxyethyl cellulose, and nanocrystalline cellulose. The nanocrystalline cellulose is provided in an amount effective to reduce the crack formation during drying.

Nanocrystallinecellulose (NCC) in tape joint compound (JC)

CMC with CMDS greater than or equal to 0.76, optionally with a non-ionic co-thickener or a CMC with CMDS less than 0.75 is used as both the rheology modifier and partial clay substitute in tape joint compounds. This significant reduction of clay level is sufficient to eliminate most of the negative characteristics of clay in joint compound.

Tape joint compounds with CMC thickener system

A mixture composition of a cellulose ether made from raw cotton linters and at least one additive is used in a ready mixed joint compound composition wherein the amount of the cellulose ether in the joint compound composition is significantly reduced. When this joint compound composition is mixed with water and applied to a substrate, the water retention, sag resistance, and workability of the wet joint compound are comparable or improved as compared to when using conventional similar cellulose ethers.

Joint compounds using thickeners prepared from raw cotton linters

An aqueous fluidized polymer suspension is comprised of at least 20% by total weight of the suspension of at least one member selected from methylcellulose, methylhydroxypropylcellulose and methylhydroxyethylcellulose having a bulk density of 0.30 g/ml or greater dispersed in an aqueous solution of at least one salt dissolved therein. These suspensions have many industrial uses; for example, they can be used for joint compound manufacture, tile cement thickening, food additives, adhesives, and in many other water based systems.

Use of high bulk density methylcelluloses in aqueous fluid polymer suspensions

A mortar cement composition is composed of a cement or ground portland cement clinker, ground limestone and/or lime, sand, a sufficient amount of water to render the composition flowable, and at least one water-soluble polymer present in the amount having a lower limit of about 0.001 wt % and an upper limit of about 0.04 wt % based on total dry weight of the ingredients, with the proviso that the extent of adsorption of the polymer onto the cement is less than 50%, and wherein the resulting mortar has 8-16% air content and greater than 70 psi flexural bond strength. This mortar cement composition is for use in building structures in all seismic zones.

Flexural bond strength/low air/workability additive for mortar cement

An improved joint compound is provided that has from about 0.2 to about 0.9% of a thickener system selected from unborated hydroxypropylguar or a blend of an unborated hydroxypropylguar and 1-3% of a cellulose ether. This thickener system is either in dry form or as a fluid suspension. This joint compound is useful for the installation of wall board paneling in residential commercial, and industrial buildings.

Tape joint compound composition using unborated hydroxypropyl guar

Sodium carboxymethylcellulose (CMC) with a D.S. between 0.35 and 0.75 and D.P. between 200 and 4000 serves as a swelling agent and can replace clay and/or mica in a joint compound formulation when used in an amount of 0.01 to 0.5% by weight.

Clay and mica replacement with CMC in joint compound

Used as a thickener a Fluidized Polymer Suspension (FPS) with or without salt as a suspending agent allows producing joint, spackling and texture compounds in significantly reduced time. Products produced with FPS are more uniform and stable than ones made with solid thickeners.

Process for preparing joint, spackling and texture compounds for gypsum

Water demand in an aqueous joint compound composition is increased by incorporating a blend of water soluble polymer (WSP) and crosslinked polyacrylic acid water demand polymer (WDP) with a WSP to WDP blend ratio of 9:1 to 25:1. A preferred WSP is hydrophobically modified hydroxyethylcellulose. This blend may also be used for aqueous tile adhesives. In the joint compound the thickener, comprising water-soluble cellulose ether(s) and water-insoluble but swellable polyacrylic acid or salt thereof, the acrylic component gives increased joint compound viscosity without the need to decrease water level or increase thickener level.

High productivity joint compounds

Thickening of heavy brine solutions based on calcium halides by use of water-insoluble hydroxyethyl cellulose is disclosed.

Method of thickening heavy brine solutions

Viscosity of hydroxyalkyl cellulose solutions is increased by treatment with benzoquinone under controlled conditions of pH.

Method of increasing viscosity of hydroxyalkyl cellulose solutions

Thickened aqueous solutions are prepared by crosslinking carboxymethyl hydroxyethyl cellulose solutions in brine via polyvalent metal ions. The CMHEC employed is characterized by specified carboxymethyl and hydroxyethyl substitution levels.

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Hockessin, DE, United States of America

Thomas J Podlas