Abstract: Compositions based on polydimethylsiloxane and physiologically inert powdered polymers, which are able to create a sharp separation layer between the erythrocytes and the serum or plasma during the centrifuging of blood samples for medical analyses.

Abstract: The resistance of a fluorinated silicone elastomer to the effects of exposure to hot fuel, hot oil, and elevated temperature has been improved by the addition of from 0.8 to 5 parts by weight of polytetrafluoroethylene powder to a curable fluorinated silicone elastomeric composition, consisting essentially of a fluorinated polydiorganosiloxane gum having from 45 to 50 percent of the organic radicals being 2-(perfluoroalkyl)ethyl radicals, from 50 to 55 percent of the organic radicals being monovalent hydrocarbon radicals with from 0.1 to 1 percent of the monovalent hydrocarbon radicals being aliphatic unsaturated radicals, and a treated reinforcing silica filler. The resistance is further improved by also including an alkaline earth metal oxide or hydroxide acid acceptor.

Abstract: A notched-impact-resistant polyvinyl chloride moulding composition having a low shrinkage value, based on vinylchloride polymers and impact-resistant modifiers, containing from 0.01 to 5% by weight, based on the total of vinylchloride polymer and impact-resistant modifier, of liquid polysiloxanes having viscosities of from 20 to 100,000 cSt and/or solid polysiloxanes having molecular weights of from 20,000 to 500,000 and optionally conventional additives and auxiliaries.

Abstract: The invention provides a novel room temperature-curable organopolysiloxane composition useful as an adhesive or a sealing material with remarkably extended workable time owing to the delayed surface filming. The base component in the composition is a conventional diorganopolysiloxane terminated with hydroxy groups at both molecular chain ends admixed with several known ingredients such as a cross linking agent, curing catalyst, filler and the like. The most characteristic ingredient in the composition effective to achieve the above mentioned desired property is a 1,1,1-trimethyl-3-hydrocarbyl-3,3-di(acylamino)disiloxane which belongs to a novel class of organopolysiloxane compounds and method is described for the preparation of these siloxane compounds.

Abstract: A flame-retardant and radiation-resistant polymer composition comprising a polymer and a halogenated acenaphthylene condensate having a structural unit of the formula (I) or (II): ##STR1## (wherein X is chlorine or bromine, n and n' are each an integer of 2 to 6, R is a substituent other than halogen, m and m' are each an integer of 0 to 4, n (or N')+m(or m').ltoreq.6, and when m or m' is 2 or more, each R may be the same or different) and a flame-retardant and radiation-resistant resin molded product prepared therefrom are herein disclosed.

Abstract: A coating composition based on a polysiloxane resin-forming precondensate, an epoxy resin, a fluorocarbon copolymer and a multifunctional amine catalyst provides non-stick coatings that can be cured at low temperatures such as 107.degree. C.

Abstract: The invention herein disclosed provides a method for preparing improved fluoroelastomer film compositions including the steps of dissolving a fluoroelastomer gum selected from the group consisting of copolymers of vinylidene fluoride and hexafluoropropylene, and terpolymers of vinylidene fluoride, hexafluoropropylene and tetrafluoroethylene in a solvent, adding a silane compound to the gum solution and curing the fluoroelastomer gum with a silane in the absence of metallic oxides. A method is also provided for adhering fluoroelastomer film compositions, devoid of metallic oxides, to substrates which includes the steps of dissolving the fluoroelastomer gum in a solvent, adding a silane compound to the gum solution, coating the substrate with the fluoroelastomer gum-silane solution, evaporating the solvent and leaving a film firmly adhered to the substrate.

Abstract: Fluorine-containing elastomers comprise the grafted copolymer havig rubber-like elasticity and having chemical linkages at the reactive sites of fluorine-containing polymeric segments and organopolysiloxane segments.

Abstract: Phenyl containing siloxane fluids are added to transparent thermoplastic polymers to give transparent thermoplastics having improved internal lubrication. For example, PhSi(OMe).sub.3 is equilibrated with (Me.sub.2 SiO).sub.x to give a fluid containing 28 percent by weight phenyl radicals, a PhSiO.sub.3 /2 to Me.sub.2 SiO ratio of 0.72 and an OMe to Si ratio of 0.78. This fluid was added to polystyrene in amount of 1 percent by weight to give a transparent plastic which exhibits no bleed and had excellent surface lubricity.

Abstract: A high molecular resin composition having superior impact strength and processability and comprising a polymeric matrix containing polyphenylene ether and a minor proportion of a low-molecular-weight olefin oligomer dispersed therein.

Abstract: A blend of (a) 90 to 20 parts fluoropolymer gum of 60 to 85 mol percent vinylidene fluoride, 10 to 40 mol percent of hexafluoropropene and 0.15 to 3 mol percent bromine-containing olefin, and (b) 10 to 80 parts fluorosilicone gum is provided which can be vulcanized in presence of free-radical initiators to produce elastomeric vulcanizates with desired balance of chemical solvent or fluid resistance, high temperature stability, and low temperature flexibility.

Abstract: A co-crosslinkable blend composition which comprises (1) an iodine-containing fluoroelastomer, (2) at least one of silicone oligomers, silicone elastomers, fluorosilicone elastomers, phosphonitrilic fluoroelastomers, tetrafluoroethylene/propylene copolymers and hexafluoropropylene/ethylene copolymers and (3) an organic peroxide.

Abstract: A co-crosslinkable blend composition which comprises an iodine-containing fluoroelastomer, an elastomer crosslinkable in the presence of a peroxy radical and an organic peroxide.

Abstract: According to our invention, thermoplastic poly(vinyl chloride) block copolymer resins of the (AB).sub.n type are formed which are flexible without the addition of an external plasticizer for poly(vinyl chloride). These novel block copolymer resins have average molecular weights (Mn) in the range of from about 15,000 to 60,000 and contain alternating rigid poly(vinyl chloride) segments and flexible linear aliphatic polyether or polyester segments, each having an average molecular weight in the range of from about 1,000 to 5,000. The resins of our invention have excellent physical properties which make them suitable substitutes for externally plasticized poly(vinyl chloride) homopolymers, particularly in automotive applications.

Abstract: Compositions which are stable when stored under anhydrous conditions, but when exposed to atmospheric moisture cross-link to form elastomers comprising (1) an organopolysiloxane having terminal condensable groups, (2) a silicon compound having at least 3 Si-bonded hydrolyzable groups per molecule and (3) from 30 to 100 percent by weight, based on the weight of the organopolysiloxane (1), of a powder obtained from the homopolymerization or copolymerization of an acrylonitrile in an aqueous medium.

Abstract: Organosiloxane equilibrations and other bond rearrangements are easily and rapidly accomplished through the utilization of catalysts comprised of solid perfluorinated polymers containing pendant sulfonic acid groups.

Abstract: A process for the preparation of chlorinated aliphatic polymers wherein chlorine-free polymers are chlorinated by using gaseous chlorine in chlorinated hydrocarbons as solvents and the chlorinated aliphatic polymers are recovered from the chlorinating solution by steam distillation in which process from 15 to 50% by weight of a lacquer resin is added to the chlorinating solution before steam distillation. The chlorinated polymers contain less residual solvent.

Abstract: Poly(amine allyl halides) copolymer may be produced by mixing an amine compound and a mono-olefinic allyl type monohalide compound in the presence of an oxidized silicon catalyst.

Abstract: Rubber compositions curable to rubbery elastomers by heating are provided, in which co-vulcanization of an organic rubber, e.g. natural rubber or an organic synthetic rubber and an organopolysiloxane rubber can be effected to a satisfactory degree, whereas such co-vulcanization in the prior art involves several difficult problems. The characterizing components in the rubber composition are the organopolysiloxane which has at least two functional units of either mercapto groups or aliphatically unsaturated linkages in the molecule and a specific organosilicon compound which has a polysulfide linkage and one or more silicon-bonded hydroxy groups or hydrolyzable atoms or groups in the molecule.

Abstract: The invention relates to organic polymers which can be crosslinked under the action of light and which are suitable for carrying out photomechanical processes. These polymers are photochemically considerably more sensitive than known comparable polymers and their sensitivity can additionally also be further increased by means of a combination with sensitizers. The molecular weight is at least 1,000. The polymers contain, as light-sensitive groups, groups of the formula I ##STR1## wherein R and R.sub.1 independently of one another denote alkyl groups with at most 4 C atoms, or R and R.sub.1 conjointly denote the remaining part of a 5-membered to 6-membered carbocyclic ring.