The Dow Chemical Company

Ferguson Safety Products

Robert J Russell

Alan E Platt

Lonna J Speer

Donna J Coomer

An institutional mattress includes a resilient core and a mattress covering sealing the core. The mattress covering has a ticking with a base fabric made of yarns with a denier value of at least 500 and has a thread count of at least 18 threads per inch in both warp and fill. The ticking is bonded to a fluid proof material having an anti-microbial agent. The core may be fire resistant polymeric foam and the ticking base fabric may be 1050 denier 'ballistic' nylon. The ticking base fabric may be coated with urethane having at least one of a flame retardant and an anti-microbial, and then laminated with a polyurethane film. Alternatively, the ticking base fabric may be treated with a flame retardant covered with a fluid proof material. The mattress covering may be sealed around the core with stitching.

Institutional mattress

Several important features and characteristics, particularly and pronouncedly environmental stress crack resistance (i.e., 'ESCR') as well as other desirable physical properties of blends or intimate admixtures, known as 'polyblends' and usually made by melt-blending, of various styrene polymers (i.e., 'SP's'), notably homopolystyrene (i.e., 'PS'), and thermoplastic elastomers (i.e., 'TE's') are significantly and in emphasized measure enhanced by thorough incorporation in (and simultaneous or subsequent heat action-initiating and cross-link-effecting of) the styrene polymer-thermoplastic elastomer polyblend in low level concentration(s) of a thermally-activatable, organic peroxide in combination with any one (or even a mixture) of an optimizing cross-linking supplement provided in effectively reactive amounts of, for illustration, either a styrene (or the like alkenyl aromatic) monomer or a reagent that is reactive towards alkenes (such as certain dithiols, amino-derivatives, etc.) or certain decomposable-type reagents (such as hexachloroethene). Besides noteworthy improvement in ESCR, the tensile strength (including tensile yield--i.e., 'T.sub.y ' and tensile rupture--i.e., 'T.sub.r '), elongation (i.e., '% Elong.') and practical toughness (as measured by Gardner Impact Strength values) are amongst the significant physical properties thus ameliorated in the styrene polymer-thermoplastic elastomer polyblends.

Physically-ameliorated styrene polymer/thermoplastic elastomer polyblends

Several important features and characteristics, particularly and pronouncedly environmental stress crack resistance (i.e., 'ESCR') as well as other desirable physical properties of blends or intimate admixtures, known as 'polyblends' and usually made by melt-blending, of various styrene polymers (i.e., 'SP's'), notably homopolystyrene (i.e., 'PS'), and thermoplastic elastomers (i.e., 'TE's') are significantly and in emphasized measure enhanced by thorough incorporation in (and simultaneous or subsequent heat action-initiating and crosslink-effecting of) the SP/TE polyblend in low level concentration(s) of a thermally-activatable, organic peroxide in combination with any one (or even a mixture) of an optimizing cross-linking supplement provided in effectively reactive amounts of, for illustration, either a styrene (or the like alkenyl aromatic) monomer or a reagent that is reactive towards alkenes (such as certain dithiols, amino-derivatives, etc.) or certain decomposable-type reagents (such as hexachlorothene). Besides noteworthy improvement in ESCR, the tensile strength (including tensile yield--i.e., 'T.sub.y ' and tensile rupture--i.e., 'T.sub.r '), elongation (i.e., '% Elong.') and practical toughness (as measured by Gardner Impact Strength values) are among the significant physical properties thus ameliorated in the SP/TE polyblends.

Improved monovinyl aromatic monomer-acrylonitrile copolymers are prepared by polymerizing at temperatures above 80.degree. C in the presence of certain free radical initiators, the resultant polymers are prepared at high rates of conversion, have relatively high heat distortion temperatures, have a low oligomer content and generate relatively little additional acrylonitrile under fabrication conditions.

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Midland, MI, United States of America

Robert J Russell