The B. F. Goodrich Company

Dana S Garcia

Paul P Nicholas

Virgil Percec

Polyarylene polyethers ('PAPE') with vinyl chain ends may be crosslinked to form networks with excellent physical and chemical properties except they tend to be brittle. In particular, a polysulfone ('PSU' made from bisphenol A and dichlorodiphenyl sulfone) with vinylbenzyl chain ends ('di-VB-PSU') is too brittle for many applications where impact resistance is essential. This brittleness is combatted by inserting a thermally stable rubbery poly(dimethylsiloxane) ('PDMS') segment having a number average molecular weight in the range from about 600 to about 5000 connected to di-VB-PSU segments by hydrosilylation in the presence of a Pt catalyst, to form a thermoplastic linear predominantly triblock oligomer with vinylbenzyl chain ends which are thermally crosslinkable. When crosslinked, the network formed has improved impact resistance and toughness, with only a little loss in the upper glass transition temperature if the relative lengths of the PDMS and PAPE are such as to provide the desired degree of phase microincompatibility sufficient to improve toughness. The triblock may be blended with a polymer with which the triblock may be crosslinked upon curing. If the VB-PSU-PDMS-PSU-VB triblock is blended with di-VB-PSU the polyblend may be crosslinked to provide improved toughness.

Triblock polyarylene polyether with polysiloxane segment and

A composition of matter comprising a blend of CPVC having a chlorine content of between about 64% and 71% by weight and poly(ethylene oxide) in a ratio of approximately 0 to 20 parts poly(ethylene oxide) per 100 parts chlorinated poly(vinyl chloride). The resulting immiscible blend demonstrates improved impact resistance, improved shear viscosities properties and relatively unaffected strength properties. Optionally, glass fiber in either mat or loose glass form may be included in the blend of CPVC and PEO either by incorporation into the blend or by lamination of mats of glass fiber with layers of the blend of CPVC and PEO to provide even more enhanced tensile and other physical strength properties.

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North Royalton, OH, United States of America

Dana S Garcia