Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Patent
1979-12-26
1981-05-05
McCamish, Marion
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
423171, 423555, 428310, 428320, 428322, 428411, 428703, 521 56, 521 83, B32B 1300, B32B 3100
Patent
active
042659647
ABSTRACT:
Compositions useful for lightweight structural units such as wallboard panels and the like are provided in which low density expandable thermoplastic granules or particles that have been expanded are used in conjunction with a cementitious base material, such as, gypsum (generally calcined to hemihydrate form, i.e. CaSO.sub.4.1/2 H.sub.2 O); a surfactant; an additive which acts as a frothing agent to incorporate an appropriate amount of air into the mixture to aid in obtaining a light density without decreasing strength or causing undue brittleness of the finished product; a film forming component to provide better flow and consistence of the mixture, as well as greater strength, flexibility, water resistance and adherence of the final product when the mixture is cured; and a starch which may be added as a binding agent and to increase the adhesive properties of the mixture.
The appropriate combination of the above ingredients can provide a mixture which can be readily mixed, have the proper consistency to be disposed in a board or panel configuration for curing, and will require a decreased excess of water over that required for hydration. Thus, the energy, time, equipment and space necessary to effect curing may be reduced. This will result in significant savings, especially in high speed, high production of product.
REFERENCES:
patent: 2965528 (1960-12-01), Loechl
patent: 3516882 (1970-06-01), Cummisford
ARCO Polymers, Inc.
McCamish Marion
Young Lewis J.
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