Abstract: A heat curable resin composition consists essentially of a thermosetting resin, a curing agent chemically reacting with the resin for curing the resin upon the application of a predetermined amount of heat for a predetermined period of time, and a chemically inert salt which is soluble in the resin for increasing the dielectric loss factor of the composition without a significant increase in viscosity of the composition to accelerate the dielectric heating rate.A method of preparing the heat curable resin composition includes the steps of mixing the thermosetting resin and curing agent which chemically reacts with the resin for curing the resin upon the application of a predetermined amount of heat for a predetermined period of time and dissolving a chemically inert salt in the resin and increasing the dielectric loss factor of the composition without a significant increase in viscosity of the composition.
Abstract: The invention relates to compounds of the formula[RSiO.sub.3/2 ].sub.z (I)in whichz is 6, 8 or 10;R represents the same or different radicals of the formulas--CH.sub.2 CH.sub.2 --X (II), --CH(CH.sub.3)--X (III) or --O--Si(R'.sub.2)--Y (IV)with the proviso that up to z-1 of the radicals can also be radicals of the formula --O--SiR'.sub.3, in which X represents a monovalent radical or one half of a divalent radical of the formulas ##STR1## R' represents the same or different C.sub.1 - to C.sub.6 -alkyl, C.sub.1 - to C.sub.6 -alkoxy or phenyl radicals;R" represents the same or different C.sub.1 - to C.sub.18 -alkyl radicals, which can be substituted by radicals of formulas (V) or (VI);R'" represents the same or different divalent C.sub.1 - to C.sub.18 -hydrocarbon radicals, preferably alkylene and/or phenylene radicals and/or radicals of the formula--(R'.sub.2 SiO).sub.n --;Z represents a halogen atom or an N-bonded amino radical, that is an NH.sub.
October 2, 1989
Date of Patent:
September 10, 1991
Richard Weidner, Norbert Zeller, Bernward Deubzer, Volker Frey
Abstract: A thickened, uncrosslinked molding composition which has a long shelf life and can be cured above 50.degree. C. comprises a liquid reactive system, a thickener, a polymerization initiator and conventional additives. The thickener is a combination of a primary aromatic amine and an isocyanate. The molding compositions, which are, in particular, SMCs or BMCs, can be processed into moldings by compression molding, injection molding or transfer molding and subsequent curing.
Abstract: A diorganopolysiloxane in which a polymerizable functional group is present at one (or both) molecule chain ends and in which an arbitrary group is present at the other end can be easily synthesized. The synthesis involves the opening of a cyclotrisiloxane using an alkali metal silanolate which bears the polymerizable functional group, followed by a capping reaction. The resulting diorganopolysiloxane can be used effectively as a feed material for manufacturing silicone rubbers, feed material for manufacturing novel grafted organopolysiloxanes, comonomer components for resins other than organopolysiloxanes or plastics, etc.
Abstract: The film-forming agent of the invention is a blend of a silica organosol, of which the silica particles have a specified specific surface area and specified densities of surface groups including silanol groups, alkoxy groups and trimethyl silyl groups, and a diorganopolysiloxane of a specified viscosity terminated at each molecular chain end with a silanolic hydroxy group. The film-forming agent is useful as a skin-care preparation for preventing chapping of hands of people having frequent occasions of contacting with water to exhibit durable water repellency.
Abstract: A silicone dispersion, having improved toughness and thixotropic characteristics, cures to an elastomer upon exposure to the air. The dispersion is particularly useful for spraying onto exposed electrical conductors to prevent their shorting out from contact with animals and birds. The dispersion contains a hydroxyl endblocked polydimethylsiloxane, aluminum trihydrate, moisture activated crosslinking agent and catalyst. In order to obtain thixotropy, it also contains a phenyl or 3,3,3 trifluoropropyl-containing hydroxyl endblocked polydiorganosiloxane and untreated fumed silica. The method of making the dispersion is also specified.
Abstract: The invention relates to novel chlorine-containing silazane polymers, to their preparation, their further processing to ceramic material containing silicon nitride, and this material itself. In order to prepare the chlorine-containing silazane polymers, oligosilazanes of the formula (I) ##STR1## in which a>0, b.gtoreq.0 and n is about 2 to about 12, are reacted with at least one of the chlorosilanes Cl.sub.2 R.sup.4 Si--CH.sub.2 --CH.sub.2 --SiR.sup.4 Cl.sub.2, Cl.sub.3 Si--CH.sub.2 --CH.sub.2 --Sir.sup.5 Cl.sub.2, R.sup.6 SiCl.sub.3 or R.sup.7 SiHCl.sub.2 at 30.degree. C. to 300.degree. C., where, independently of one another,R.sup.1 and R.sup.2 =H, C.sub.1 -C.sub.6 -alkyl or C.sub.2 -C.sub.6 -alkenyl,R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 =C.sub.1 -C.sub.6 -alkyl or C.sub.2 -C.sub.6 -alkenyl and where if b=0 the reaction with R.sup.7 SiHCl.sub.2, if R.sup.7 =C.sub.1 -C.sub.6 -alkyl and none of the other chlorosilanes is present, is to be excluded.
November 30, 1989
Date of Patent:
July 16, 1991
Tilo Vaahs, Marcellus Peuckert, Martin Bruck
Abstract: 102 composition. The coating composition of the present invention is a moisture-curable polymethyl-n-hexylsilsesquioxane having a partially water-hydrolyzed, silane catalyst-containing condensation product of n-hexyltrimethoxysilane and methyltrimethoxysilane, the silane catalyst having at least one aminoalkyl-substituted group and at least one alkoxy-substituted group having at least 2 carbon atoms in the alkoxy group. The silane catalyst is also a co-curing agent and condenses with the n-hexyltrimethoxysilane and the methyltrimethoxysilane.
Abstract: Silicone resin compositions useful as transfer molding resins are prepared by blending a siloxane resin, filler, and as a catalyst an alkali metal salt of a carboxylic acid, a combination of an alkali metal carbonate or bicarbonate and a carboxylic acid, or an alkali metal carbonate and an ammonium salt of a carboxylic acid.
Abstract: Disclosed are waterproofing agent primer compositions which can be applied to wet and dry structures and methods of waterproofing structures made of waterpenetrable construction materials which can be used on wet and dry structures. The primer compositions include a C.sub.8 -C.sub.18 fatty acid, a natural or synthetic rubber, a resin, and an organic solvent.
Abstract: Disclosed is a curable composition which is superior in chemical resistance and weather resistance and appearance by the use of oxazolidine compounds, comprising (A) a compound having a carboxylic anhydride group, (B) an oxazolidine compound and (C) a polymer containing an alkoxysilyl group. An epoxy compound (D) may be added to the composition.
Abstract: The invention relates to an elastic street pavement mass comprising aggregate bound by a binder and, when needed, coloring agents and other additives, and which is particularly suitable for preparing pavements having the shade of the aggregate or being toned. The efforts made so far to replace bitumen, which is hard to dye, by a colorless binder, have resulted in the use of expensive and brittle binders. However, an economical, strong and dyeable pavement mass has now been discovered, the binder of which consists of tall oil resin, wood resin, turpentine resin, their derivatives or a mixture formed by these agents, and of a process oil softening the above resins, comprising additionally rubber and plastic as auxiliary agents. The products have a better stability and at least as high an abrasion resistance to studded tires as a conventional bitumenous pavement mass.
Abstract: The invention is relative to optionally cross-linked organopolysiloxane urea derivatives and thiourea derivatives consisting of: ##STR1## wherein X stands for 0 or S andR.sup.1 is a group of the formula: ##STR2## in which R.sup.5 is alkylene with 1 to 10 C atoms or cycloalkylene with 5 to 8 C atoms or a group of the formula: ##STR3## with n=1-6 (on the nitrogen)m=0-6 (on the silicon), wherein R.sup.2 has the same meaning as R.sup.1 or stands for H, R.sup.3 and R.sup.4 have the same meaning as R.sup.1 or stands for H or alkyl with 1 to 5 C atoms. At least two but at the most three groups according to formula (2) are bound to the units according to formula (1). The free valances of the oxygen atoms bound to the silicon atom are saturated by silicon atoms of further groups of formula (2) with the optional inclusion of cross-linking agents. In addition, preparative methods for the products and a use for the removal of dissolved metals from liquid phases are indicated.
Abstract: Organopolysilazanes or organopoly(disilyl)silazanes having controlled physicochemical properties, well adapted for shaping and pyrolysis into useful ceramic articles, are prepared by catalytically polymerizing a silazane monomer to a desired degree of polymerization, and then, either during or upon completion of polymerization, contacting the polymerization reaction medium with at least one adsorbent material.
Abstract: A coating composition useful for a finish for automobiles and trucks in which the film forming binder contains reactive binder components of about(a) 25-90% by weight, based on the weight of the binder, of an acrylic polymer having at least two reactive anhydride groups composed of polymerized monomers of an ethylenically unsaturated anhydride and polymerized monomers from the group consisting of alkyl methacrylate, alkyl acrylate and any mixtures thereof, wherein the alkyl groups have 1-8 carbon atoms and the polymer has a weight average molecular weight of about 2,000-50,000;(b) 5-50% by weight, based on the weight of the binder, of a glycidyl component having at least two reactive glycidyl groups;(c) 5-40% by weight, based on the weight of the binder, of a monomeric or oligomeric anhydride component; andthe composition contains about 0.1-5% by weight, based on the weight of the binder, of a catalyst.
June 27, 1988
Date of Patent:
May 21, 1991
E. I. Du Pont de Nemours and Company
Robert J. Barsotti, Lili W. Altschuler, Lee R. Harper
Abstract: An improved moldable low density thermoplastic composite containing hollow glass spheres comprising a blend of thermoplastic resin, glass fiber reinforcement, and a concentrate of hollow glass spheres dispersed in thermoplastic resin.
Abstract: A glass fiber-reinforced composite material is produced by treating glass fibers with a silane composition comprising silane molecules having amine functional groups and silane molecules having ethylenically-unsaturated functional groups; admixing the treated glass fibers with a polyolefin resin, and a fiber bonding agent comprising a polymerizable unsaturated organic compound having at least two polymerizable unsaturation groups, a vinyl-polymerizable unsaturated, hydrolyzable silane, and a free radical generator, and exposing the resultant mixture to conditions of temperature and pressure sufficient to cause the formation of a glass fiber-reinforced composite material. The use of the silane composition promotes improved impact strength of the composite.
December 21, 1989
Date of Patent:
May 7, 1991
Union Carbide Chemicals and Plastics Technology Corporation
Abstract: The invention provides a liquid coating composition for forming a transparent and hard coating film on a plastic member such as a polycarbonate or polymethyl methacrylate plate. The liquid composition comprises 100 parts by weight of an organotrialkoxysilane R.sup.1 Si(OR.sup.2).sub.3, where R.sup.1 is a C.sub.1 - or C.sub.2 -alkyl group and R.sup.2 is a C.sub.1 -, C.sub.2 - or C.sub.3 -alkyl group, 5-20 parts by weight of an organotrialkoxysilane R.sup.3 Si(OR.sup.2).sub.3, where R.sup.3 is an organic group containing epoxy group, 50-200 parts by weight of an aqueous colloidal silica sol in which the content of SiO.sub.2 is 10-40 wt %, and 0.5-3 parts by weight of a dicarboxylic acid (CF.sub.2).sub.n (COOH).sub.2, where n is an integer from 1 to 5, preferably hexafluoroglutaric acid. On a surface of a plastic member a coating film of this composition is partially cured at 70.degree.-150.degree. C. to turn into a fairly hard but still pliable film.
Abstract: A thermal conductive polymer composition comprising a mixture of a polymer and a thermally conductive filler material, said filler material having a median particle size of between about 130 to 260 microns and a size distribution characterized by the formula: ##EQU1## where % represents the wt. % of the particles below or above the median particle size and M represents the median particle size in microns.
Abstract: Fiber reinforced thermoplastics sheet is produced by a wet method from (a) an aqueous dispersion of reinforcing fibers an dispersing agent; and (b) an aqueous dispersion of thermoplastics polymer powder and an ionic polymer additive of opposite charge to the fiber dispersion. The dispersions are mixed, a high molecular weight ionic polymer flocculating agent is added, of charge opposite to that of the mixture, and the resulting suspension is drained and dried to form the sheet.