Abstract: A process is disclosed for the production of injection molded high density polyethylene articles having reduced combustibility and high impact strength comprising: maintaining a mold cavity at a preselected back pressure sufficiently high to substantially prevent foaming of a high density polyethylene material melt to be injected therein; injecting said melt into said mold cavity under pressure in excess of said back pressure to fill said mold cavity; said high density polyethylene material melt containing: (a) from about 50 to 70% by weight of alumina trihydrate, (b) from about 1 to 12% by weight of water as a processing aid, and (c) from about 0.5 to 3% by weight of a methoxy polyethylene glycol propyltrimethoxy silane having the formula:CH.sub.3 O(C.sub.2 H.sub.4 O).sub.n C.sub.3 H.sub.6 Si(OCH.sub.3).sub.3wherein n represents the average number of ethoxy repeat units between 3.0 and 11.0.

Abstract: This invention is concerned with dry liquid concentrates of hydrated alumina, that is, aluminum trihydrate, coated with a substantial amount of a silane containing three hydrolyzable groups bonded to a silicon atom thereof and containing at least one monovalent group which contains a polyalkylene oxide moiety therein, and/or hydrolyzates of such silanes and/or condensates of such hydrolyzates. Such treated hydrated alumina concentrate are useful in the treatment of alumina trihydrate particles to enhance their usefulness in reinforced plastic compositions and in coatings.

Abstract: This invention is concerned with the treatment of particulate titanium dioxide with a polyether substituted silicon compound which serves to enhance its employment in pigmented and/or filled paints and plastics, and in reinforced plastic composite compositions.