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AssigneeChevron Phillips Chemical Company LP
InventorsMichael Hanner, Chen-Youn Sue, Clifford Pettey, Carleton Stouffer, Paul Hunt, Ken Bowen
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Compositions, processes, and methods are provided relating to styrenic polymers, including high impact polystyrene (HIPS), also referred to as rubber-modified polystyrene. In one aspect, a process is provided for making high impact polystyrenes, comprising the steps of combining a monovinylarene component, a monovinylarene-conjugated diene block copolymer, and a conjugated diene polymer. In another aspect, the feed components form an emulsion having a continuous phase and a dispersed phase. The continuous phase comprises at least a portion of the monovinylarene component and at least a portion of the conjugated diene polymer. The dispersed phase is suspended within the continuous phase, and comprises globules having at least a portion of the monovinylarene-conjugated diene block copolymer, a remaining portion of the monovinylarene component, and a remaining portion of the conjugated diene polymer. The monovinylarene component is polymerized in the presence of the emulsion alone or in the presence of other feedstocks.
A process of making a high impact polystyrene comprising the steps of:
A high impact polystyrene composition having a 60 degree angle gloss at a mold temperature of 150° F. in a range of about 85% to about 105%, a tensile yield strength in a range of about 3800 psi to about 5500 psi, and a ⅛″ notch Izod in a range of about 0.50 ft-lb/inch to about 8 ft-lb/inch.
A process of making a high impact polystyrene comprising the steps of:
A process of making a feedstock emulsion comprising the step of combining a monovinylarene component, a monovinylarene-conjugated diene block copolymer, and a first conjugated diene polymer to produce the feedstock emulsion, the monovinylarene-conjugated diene block copolymer having a monovinylarene component content of greater than 50 wt. %.
A process of making a high impact polystyrene comprising the steps of:
A process of making a high impact polystyrene comprising polymerization of a monovinylarene component in the presence of a feedstock additive comprising a first conjugated diene polymer and a monovinylarene-conjugated diene block copolymer, the monovinylarene-conjugated diene block copolymer having a monovinylarene content of greater than 50 wt. %.
Dependencies are inferred from the claim text.