Abstract: Foam in an environment with free surface turbulence is controlled with a foam control agent which comprises (A) 5 to 90 parts by weight of an organopolysiloxane having at least 40% siloxane units with a substituent --Z.sub.z --R' wherein R' is a C.sub.9-35 alkyl group, Z is a linking group with silicon and z is 0 or 1, provided more than 70% by weight of its carbon content is due to the groups --Z.sub.z --R', (B) 0.1 to 30 parts by weight of a finely divided hydrophobic particulate material, (C) 5 to 95 parts by weight of a hydrocarbon oil and (D) 0 to 20 parts by weight of an organosilicon MQ resin.

Abstract: A suds-controlling composition which comprises 100 parts by weight of a silicone antifoam which has a liquid branched polyhydrocarbyl siloxane material having at most 2 mole % branching and at least 2 trifunctional or tetrafunctional siloxane units, a finely divided hydrophobic filler, and from 75 to 900 parts by weight of a polyorganosiloxane polyoxyalkylene copolymer can be used as a stable suds-controlling composition for aqueous surfactant compositions, especially liquid detergents.

Abstract: A continuous static polymerization reactor for the production of liquid polymers comprises an elongated hollow reaction chamber (30) which has a porous wall (31) and a jacket means (40) spaced around the reaction chamber (30), which is provided with means (44) for introducing a fluid through the porous wall (31). The reactor is particularly useful for a process for making liquid polymers by condensing monomers and/or oligomers. It comprising the use of a pressurized gas to cause the reaction mixture to reach a foam-like consistency. This is beneficial in the condensation polymerization. Feeding a fluid through the porous wall into the reaction chamber avoids build up of the polymer on the wall.

Abstract: Process for preparing a catalyst for hydrosilylation reactions which comprises reacting (A) a rhodium complex Rh(R.sub.2 S).sub.3 X.sub.3, in which R represents alkyl and other specified hydrocarbon groups and X represents Cl or Br with (B) an organohydrogen polysiloxane in the presence of (C) an organosiloxane having silicon-bonded vinyl or allyl groups. The ratio of silicon-bonded hydrogen atoms provided by (B) to each Rh atom provided by (B) is in the range from 0.5:1 to 6.0:1.The invention also includes the use of the catalyst for reacting .ident.SiH with .ident.Si Alkenyl especially in compositions for the treatment of substrates such as paper and plastics.

Abstract: A foldable intermediate bulk container with a preferred capacity of about 1000 liters, capable of being stacked both in its erected position and in its folded position, comprises a rectangular base (10), four walls (21, 22, 23, 24) and a lid (35, 36) which are all interconnected. Each wall is pivotally connected to the base (10), at least three of them at different heights from the support (17) of the base, ascending by at least one wall thickness. It is preferably adapted for liquid or free-flowing powder. The base (10) may incorporate the function of a pallet into the structure of the container and may include means for facilitating emptying the container. The container may use an inner pocket (20) for the liquid or powder.

Abstract: A glycerol functional polysiloxane having the formula ##STR1## wherein R is an alkyl group having from one to six carbon atoms or a phenyl group; x has a value of from zero to about six hundred; y has a value of from one to about six hundred and z has a value of from two to about eight.

Abstract: Particulate foam control agents for powder detergents consist of 1 part by weight of silicone antifoam, not less than 0.3 part by weight of a water insoluble fatty acid or a fatty alcohol with 12 to 20 carbon atoms and a melting point in the range 45 to 80% or a monoester of glycerol and a fatty acid and a native starch carrier material. They give improved storage stability and require less organic material than the prior art agents.

Abstract: The specification is concerned with a process and apparatus for continuous manufacture of moisture curable silicone compositions.

Abstract: A method of making organopolysiloxanes comprises contacting organosilicon compounds having at least one unit ##EQU1## wherein R.degree. is hydrogen, hydroxyl, a C.sub.1-18 hydrocarbon, substituted hydrocarbon or hydrocarbonoxy group and a has a value of from 0 to 4 with a phosphonitrile halide AB, wherein A is a phosphonitrile halide cation [X(PX.sub.2 .dbd.N).sub.n PX.sub.3 ].sup.+, wherein X is halide and n is from 1 to 8 and B is an anion derived from a Lewis acid not containing a P atom, e.g. [MX.sub.(v-t+1) R.sup.2 .sub.t ].sup.-. The method is particularly useful for condensation of silanol end-blocked siloxanes.

Abstract: A method of making a dispersion of a high viscosity siloxane in a volatile, especially cyclic siloxane, comprises first dispersing organopolysiloxanes having at least 2 Si--OR groups, wherein R is H or alkyl in a volatile siloxane and adding a catalyst which is either a phosphonitrile halide having the general formula [X(PX.sub.2 .dbd.N).sub.n PX.sub.3 ].sup.+ [MX.sub.(v-t+1) R.sub.t ].sup.-, or a heterogeneous catalyst selected from Li, Mg, Ca, Sr or Ba hydroxide, Na or K borate or phosphate, Rb or Cs carbonate or carboxylates of Rb or Cs wherein M is an element having an electronegativity of from 1.0 to 2.0, R is alkyl, X is halide, n is 1 to 6, v is the valence of M and t is from 0 to (v-1).

Abstract: A foamable silicone composition comprises a polysiloxane having silicon-bonded hydrogen atoms, a polysiloxane having siloxane units including unsaturated groups, a polysiloxane having silicon-bonded hydroxyl groups, a noble metal catalyst and from 3 to 40 parts by weight per 100 parts by weight of the composition of entities of borosilicate or silicate glass or mixtures thereof. The composition comprises first and second Parts A and B having viscosities which are sufficiently similar to each other to permit facile machine mixing of the Parts; the first Part comprises the noble metal catalyst and a portion of the entities and the second Part comprises the polysiloxane having silicon-bonded hydrogen atoms and a portion of the entities pretreated with a compatible silane or a polysiloxane having silicon-bonded hydrogen atoms. Preferred entities comprise hollow spherical particles or hollow entities which have an irregular configuration.

Abstract: A cartridge intended for depositing a sealant composition with an extrusion device such as an extrusion gun is improved by exerting a constant pressure on a plunger during storage. The cartridge is a tube with an exit port on one end and a plunger on the other end where a pressure portion having a removable resilient element transmits a constant force to the composition through the plunger. The resilient element is removed before the cartridge is placed in the extrusion gun.

Abstract: The specification describes and claims a method of making silicone foam compositions comprising the steps of introducing into a moulding cavity a quantity of foamable silicone compositions which is curable at room, or slightly elevated, temperature and bring about curing in the cavity to produce a cured silicone foam. The moulding cavity is closed prior to foaming thereby restricting expansion of the foam. The volume of the closed moulding cavity is a minimum 10% less than that which would be occupied by the composition if it foamed and cured at room temperature without restriction. Lower density foams formed by the above procedure may be converted into rigid elastomeric low density materials by a heat or microwave post cure. For a given composition and foam density the fire resistance of a foam produced by a method according to the invention is greater than a foam which is allowed to foam freely.

Abstract: The specification describes and claims filled compositions, e.g. moisture curable sealant compositions which comprise 100 parts by weight of polymeric material comprising a mixture and/or a reaction product of a polydiorganosiloxane having silicon-bonded hydroxyl groups with a compound containing silicon-bonded alkoxy or alkoxyalkoxy groups, 50 to 200 parts by weight of finely divided filler and an additive which is a reaction product of an organic amine, an oxide, hydroxide, carbonate, bicarbonate or a mixture thereof with a sulphonic acid of the formula RSO.sub.3 H in which R represents a hydrocarbon group which may be halogenated. The additive is preferably a reaction product of the sulphonic acid and an oxide, hydroxide, carbonate or bicarbonate of magnesium, or calcium and the acid is preferably one in which R represents a group R'C.sub.6 H.sub.4 wherein R' represents an alkyl group having 6 to 18 carbon atoms, for example dodecylbenzenesulphonic acid.

Abstract: A cartridge intended for depositing a sealant composition with an extrusion device such as an extrusion gun is improved by exerting a constant pressure on a plunger during storage. The cartridge is a tube with an exit port on one end and a plunger on the other end where a pressure portion having a removable resilient element transmits a constant force to the composition through the plunger. The resilient element is removed before the cartridge is placed in the extrusion gun.

Abstract: A method of bonding a silicone elastomer to a substrate which comprises treating the surface of the substrate with a cleaning agent which is a polydiorganosiloxane, for example a polydimethylsiloxane, and thereafter applying to the treated surface a room temperture curing silicone elastomer-forming composition.The method finds particular application in the construction industry for the bonding of sealants to non-porous substrates such as aluminum.

Abstract: The specification discloses a curable composition comprising 100 parts by weight of polysiloxane, 50 to 200 parts by weight of finely divided filler having an average particle size greater than 0.05 micron and not less than 0.5 parts by weight per 100 parts by weight of the filler of an additive which is a reaction product of an organic amine, or an oxide, hydroxide, carbonate, or bicarbonate or a mixture thereof with a sulphonic acid of the formula RSO.sub.3 H in which R represents a hydrocarbon group which may have halogen or amino substituents and which contains not less than six carbon atoms. Preferred additives are reaction products of the sulphonic acid and an oxide, hydroxide, carbonate or bicarbonate of sodium, magnesium, zinc, calcium, barium, aluminium or a mixture thereof. The group R of the sulphonic acid may be R'C.sub.6 H.sub.4 where R' represents an alkyl group having 6 to 18 carbon atoms and a preferred acid is dodecylbenzenesulphonic acid.

Abstract: The specification discloses a method of preparing a polysiloxane by chain extension of a silicon compound having chain terminating units including a silicon-bonded hydroxyl group which comprises bringing about condensation of the silicon-bonded hydroxyl groups at a temperature of less than 50.degree. C. in presence of an acidic condensation catalyst of the formula RSO.sub.3 H and water, to an extent of less than 7 moles per mole of acidic condensation catalyst. The silicon compound may comprise a hydroxyl end-blocked polydimethylsiloxane having a viscosity at 25.degree. C. in the range 30 to 100,000 mm.sup.2 /s, and it may be polymerized to provide an .alpha.,.omega. dihydroxy polydimethylsiloxane having a viscosity in the range 1,000 mm.sup.2 /s to 100,000 mm.sup.2 /s or more. Preferred acidic condensation catalysts are those in which R is an alkyl group having a chain of 6 to 18 carbon atoms or a group R"C.sub.6 H.sub.

Abstract: The specification describes a method of preparing a polysiloxane including at least one siloxane unit having a silicon-bonded group --OX in which X is a saturated or unsaturated hydrocarbon group, for example methyl, alkenyl or alkynyl. The method comprises bringing about chemical reaction between a polymer having at least one siloxane unit having a silicon-bonded hydroxyl group and an alcohol of the general formula HOX in presnece of an acidic condensation catalyst of the formula (i) RSO.sub.3 H in which R represents an alkyl, aryl or alkaryl group which may be halogenated at a temperature of less than 50.degree. C. under conditions to cause condensation reaction between hydroxyl groups of the siloxane units and the alcohol.

Abstract: Organopolysiloxane compositions which are curable to elastomers via an addition reaction of unsaturated bonds to silicon-bonded hydrogen atoms in the presence of a group VIII metal catalyst have improved adhesion, without inhibiting their curing, by incorporating an organosilicon compound of the general formula(RO).sub.c R.sub.3-c SiO(R.sub.2 SiO).sub.x (R'RSiO).sub.y (R"RSiO).sub.z SiR.sub.3-c (OR).sub.cwherein R is a hydrocarbon, R' has olefinic unsaturation and at least 6 carbon atoms, R" contains an epoxy group and x, y and z are at least 1, z being 2 if c is 0.