Unilever Patent Holdings B.v.

Other

John R Newton

Derek Aldcroft

Peter W Stanier

James P Quinn

Peter W Stainier

An amorphous silica has a pore volume in the range of from about 1.6 to about 2.5 cc g.sup.-1, a mean pore diameter in the range of from about 8.0 to about 20 nm, a surface area in the range from about 450 to about 1100 m.sup.2 g.sup.-1 and an oil absorption in the range of from about 250 to about 350 cc/100g.

Amorphous silicas

An amorphous silica, especially precipitated silica, suitable for use in toothpastes, has a high abrasivity represented by a perspex abrasion value in the range from about 23 to about 35.

Amorphous silica

A method of molding complex shapes by injecting a plastics material resin into fibers (24, 32) within a mold (10, 34) wherein one or more galleries (22, 40) is provided in the mold communicating with the fibres, the gallery or galleries being so arranged as prevent substantial deformation of the fibres into them. The galleries may be arranged transverse to the length of some or all of the fibres and be sufficiently narrow to prevent deformation of the fibres into them; or the galleries may lie in the same general direction as the length of the fibres and channel inserts (42) provided with a series of transverse slots (44) are employed within the galleries to prevent fibres being pressed into the galleries.

Mold for molding a fiber reinforced article

Amorphous silica can be prepared in a stable and pumpable suspension, suitable for use in alcoholic beverage stabilisation, by adding a polysaccharide or inorganic gelling agent. Examples of polysaccharides are carboxy methyl celluloses, guar gum and Xanthan gum. Preferably the suspension contains sorbic acid, benzoic acid or a benzoate to give synergistic action with the polysaccharide.

Method for stabilizing alcoholic beverages using an aqueous suspension

A method of molding complex composite articles having skin portions containing fibres to be injected with a resin and a core portion includes providing one or more galleries in the core or fibre skin and injecting resin into the gallery or galleries whereby it is rapidly transmitted to all portions of the skin. The galleries overcome the resistance to flow created by the capillary nature of the fibrous layer and enable more rapid mold cycles to be employed and more complex articles therefore to be molded.

Method of injection molding composite articles

Stable suspensions for filtering beer

A precipitated silica, suitable for use in toothpastes, has a high absorbency, i.e. 110 to 180 cm.sup.3 100 g, and good abrasivity with a plastics abrasion value of 12 to 20. The silica provides abrasion even at a relatively low particle size.

Precipitated silicas

Amorphous silicas suitable for use as abrasives in transparent toothpastes can be prepared by a precipitation route. These silicas are distinguished by having a BET surface area of 420 to 550 m.sup.2 /g, a weight mean particle size of 5 to 20 micron, a perspex abrasion value of 15 to 28, a mean pore diameter from 3 to 8 nm and a transmission of at least 70% in the R1 range from 1.444 to 1.460.

Silicas

A composite cover having high load-bearing capacity comprising an upper and a lower skin of fiber-reinforced plastic material, the upper and lower skins being integral with one another around the edges of the cover and spaced apart from one another therebetween, the space so formed containing reinforcing walls of fiber-reinforced plastic material extending between the upper and lower skins, the reinforcing walls being integral with the upper and lower skins where they contact the same, the voids between the reinforcing walls being filled with lightweight infills, and the skins and reinforcing walls being resin impregnated so as to form one solid integral unit substantially free of joints or seams.

Composite article

A composite cover 10 for a manhole or other opening comprises an upper 12 and lower 14 skin of glass reinforced plastics material. The upper and lower skins are bonded to one another about the edges 18 and spaced apart from one another therebetween to define a space 16 containing reinforcing walls 20 extending between the upper 12 and lower 14 skins. The reinforcing walls 20 are preferably formed from a corrugated sheet of glass fibre reinforced plastics material. The cover of the invention is as strong as conventional cast iron covers but is lighter and cheaper to manufacture.

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Cheshire, United Kingdom

John R Newton