Rubber latex foam

A substance which assists in holding the foam structure produced by whipping or frothing in the manufacture of latex foam rubber. 

Madge, E. W., Latex Foam Rubber, John Wiley Sons, New York, 1962. 

In the case of cellular rubber, the ASTM uses several classifications based on the method of manufacture [11,12]. Cellular rubber is a general term covering all cellular materials that have an elastomer as the polymer phase. Sponge rubber and expanded rubber are cellular rubbers produced by expanding bulk rubber stocks, and are open-cell and closed- cell, respectively. Latex foam rubber, which is also a cellular rubber, is produced by frothing a rubber latex or liquid rubber, gelling the frothed latex, and then vulcanizing it in the expanded state. 

Cellular rubber is a generic term and includes latex foam produced chiefly by aeration of compounded latex, which is of necessity open-cell because water must be removed rapidly during processing (1). ASTM D 1055 defines flexible cellular rubber as "a cellular organic polymeric material that will not rupture within 60 seconds when a specimen 200 by 25 by 25 mm is bent around a 25-mm diameter mandrel at a uniform rate to produce 1 lap in 5 seconds in the form of a helix at a temperature between 18 and 29 C." The structure of latex foam rubbers consists of a network of open or interconnecting cells. Latex foam rubbers are made from rubber lattices or liquid rubbers. They are manufactured in sheet, strip, molded, or specific shapes (3). 

The cushion in the boots may use a wool felt, a foamed PVC (4 to 6 Ib/ft ), or latex foam rubber. This specification was validated 21 August 1989. 

BS 3157 1960 Specification for Latex Foam Rubber Components for Transport Seating, 17 pp... 

E.W. Madge, Latex Foam Rubber, Maclaren and Sons Ltd., London, 1962. 

Polyurethanes can have diverse properties, depending on which diisocyanate or diol is used and on whether water is excluded. Foams can be hard — like insulating material — or soft — like car seats or Miss Piggy. (Truth be told, only the early versions of Miss Piggy were made of polyurethane. As her popularity grew, she had to be mass-produced, so her makers switched to natural latex foam rubber, which they could mold readily.)... 

ZnO is especially effective in gelation of the latex foam with sufficient stability making it to be useful in the production of latex foam rubber products. 

Latex Foam Rubber. Latex foam rubber was the first cellular polymer to he produced by frothing, (f) A gas is dispersed in a suitable latex (2) the ruhher latex particles are caused to coalesce and form a continuous ruhher phase in the water phase (5) the aqueous soap film, breaks owing to deactivation of the surfactant in the water, breaking the latex film, and causing retraction into the connecting struts of the bubbles (4) the expanded matrix is cured and dried to stabilize it. 

Latex rubber foams are generally prepared in slab or molded forms in the density range 64-128 kg/m (4-8 Ib/ft ). Synthetic SBR latexes have replaced natural rubber latexes as the largest-volume raw material for latex foam rubber. Other elastomers used in significant quantities are polychloroprene, nitrile rubbers, and synthetic cfs-polyisoprene (116). 

Various geometric coring patterns in polyurethanes (174,178) and in latex foam rubber (179) exert significant influences on their compressive behavior. A good discussion of the effect of cell size and shape on the properties of flexible foams is contained in References (60) and (163). The effect of open-cell content in polyethylene foam is demonstrated (173). 

Latex foam rubber was initially accepted as a desirable comfort-cushioning material because of its softness to the touch and its resilience (equal to that of a steel spring alone but with better damping qualities than the spring). 

Cellular rubber has been used extensively as shoe soles, where its combination of cushioning ability and wear resistance, coupled with desirable economics, has led to very wide acceptance. In this case the cushioning properties are of minor importance compared with the abrasion resistance and cost. Other significant cushioning applications for cellular rubbers and latex foam rubbers are as carpet underlay and as cushion padding in athletic equipment. 

Latexmischen latex foam Latexschaum latex foam rubber Latexschaumgununi, Schaumgununi latex paint Latexfarbe latex tube/ lactifer/lacticifer Milchsaftrbhre,... 

Uses Emulsifier for cationic or blended ionic emulsion systems frothing agent, gel sensitizer in latex foam rubber... 

Chem. Descrip. Alkyl trimethyl ammonium chloride Ionic Nature Cationic Uses Gel sensitizer for latex foam rubber Octosol474 [Tiarco]... 

Ammonium capryleth sulfate Rhodapex CD-128 fiothing agent, inks Jeflox WL-440 Jeflox WL-660 Jeflox WL-1400 Jeflox WL-5000 frothing agent, latex foam rubber Octosol 571... 

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