Abstract: Provided is a dental restorative material having high mechanical strength, abrasion resistance, hardness and excellent aesthetic appearance because it contains a large amount of an ultrafine filler having a particle size of 0.1 .mu.m or less, and can hence be used for restoring molars as well as foreteeth. The dental restorative material comprises an inorganic filler with a size of 0.1 .mu.m or less which is insoluble in water and surface-treated with a silane coupling agent represented by the following general formula: ##STR1## and a (meth)acrylate monomer composition containing at least 50% by weight based on the weight of the composition of at least one hydrophobic multifunctional (meth)acrylate represented by the following general formula: ##STR2## said surface-treated inorganic filler being incorporated in an amount of at least 100 parts by weight based on 100 parts by weight of said monomer composition.

Abstract: The present invention provides methods for treating reclaimed sand obtained from dismantled foundry molds and cores which contain a cured binder derived from an ester cured alkaline phenolic resin. Treatment of the reclaimed sand with a silane solution, particularly an aqueous solution, enhances the tensile strengths of foundry molds and cores produced therefrom beyond those obtained with untreated reclaimed sand. Methods for producing foundry cores and molds which incorporate such a treatment process are also provided by this invention as are raw batch formulations.

Abstract: Disclosed is a self-lubricating composite material prepared from polymers, used for the fabrication of bearing members. The composite material is characterized by the fillers or solid lubricants contained therein which have been treated with titanates or silane compounds and by the liquid lubricant contained therein which include polar compounds. Bearing members made by this self-lubricating composite material have a lower friction coefficient than commercial self-lubricating bearing members, can use thermoset plastics as a matrix and can be made into colored products.

Abstract: A heat-resistant, high-impact polystyrene composition is disclosed, comprising:(A) 100 parts by weight of high-impact polystyrene,(B) from 1.5 to 5 parts by weight of glass fibers,(C) from 2.5 to 10 parts by weight of a styrene-butadiene-styrene copolymer, and(D) from 0.05 to 5 parts by weight of a metal salt of a higher fatty acid,the high-impact polystyrene (A) having a polybutadiene content of from 4.5 to 8.0% by weight and an average rubber particle diameter of from 0.5 to 2.0 .mu.m and containing no plasticizer;the glass fibers (B) having an average fiber length of from 0.5 to 2 mm and an average aspect ratio of 20 or more and having undergone surface treatment with a silane coupling agent; andthe styrene-butadiene-styrene copolymer (C) having a butadiene unit content of from 40 to 80% by weight.

Abstract: Self-lubricating polyacetal resin compositions and molded articles (e.g. "wear parts") formed thereof include a polyacetal base resin, and a self-lubricating effective amount of a silica powder in which a silicone polymer (e.g. silicone oil) is absorbed. The silica powder acts as a carrier for the silicone polymer so as to improve the dispersibility of the silicone polymer in the polyacetal base resin as well as to allow greater silicone polymer "loading" of the polyacetal base resin. As a result, improved lubricant dispersibility and sliding characteristics are achieved.

Abstract: A rubber composition which contains, in a matrix consisting mainly of rubber, irregularly shaped particles having high hardness, and subjected to surface treatment for improving their affinity for the matrix, or their adhesion to it.

Abstract: A reinforced thermoplastic composite comprising a linear alternating polymer of at least one olefinically unsaturated compound and carbon monoxide, and a glass fiber reinforcement having a coating of a sizing material which consists essentially of aminosilane and uncured epoxy resin functionalities. Articles manufactured from this composition and a process for producing the composition are also disclosed.

Abstract: A polymer impurity deactivator comprising a metal hydroxide, a hydrotalcite, or another metal oxide compound, or mixtures thereof, each of which compounds or mixtures(i) contain at least one zinc, magnesium, or aluminum cation; and(ii) have been surface treated, or mixed, with a hydrocarbon based or siloxane based amphiphatic compound, each amphipathic compound having one or more polar groups incorporated into its molecular structure to provide a polar group frequency factor of at least about 0.01.

Abstract: The polyarylene sulfide resin composition is improved in impact strength and rigidity and useful as engineering plastics. It is prepred by mixing 100 parts by weight of a resin component comprising(A) 99 to 20 parts by weight of a polyarylene sulfide resin and(B) 1 to 80 parts by weight of a polyamide resin with(C) 0.5 to 50 parts by weight of an olefin copolymer comprising an .alpha.-olefin and a glycidyl ester of an .alpha., .beta.-unsaturated acid,(D) 0.01 to 5 parts by weight of an alkoxysilane compound and(E) 0 to 400 parts by weight of one or more fillers selected from among fibrous, powdery and flaky ones.

Abstract: A polyimide resin is prepared by polymerizing (A) a tetracarboxylic acid dianhydride component consisting essentially of 10 to 50 mol % of 2,2-bis(3,4-benzene-dicarboxylic anhydride)perfluoropropane and 90 to 50 mol % of pyromellitic dianhydride or similar acid dianhydride and (B) a diamine component consisting essentially of 10 to 80 mol % of a silicon diamine and 90 to 20 mol % of an ether diamine. The polyimide resin is dissolved in an organic solvent and blended with finely divided silica to form a composition which is useful for protecting semiconductor elements.

Abstract: A rubber composition comprising at least one natural and/or synthetic rubber component(s), fine inorganic fibers subjected to a surface treatment with a surface treating agent and a non-sulfur type vulcanizing agent and a golf ball comprising the composition which exhibits excellent durability, bounce impact elasticity and excellent feeling upon hitting.

Abstract: A high temperature resistant structural composite composed of ceramic fibers and an organic resin is disclosed in which improved structural performance is obtained through modification of the surface of the ceramic fibers to improve the fiber to resin bond. The ceramic fibers are coated with silanol groups that re-establish hydroxyl sites to enable a difunctional organic coupling agent to bond a resin to the ceramic fibers more effectively.

Abstract: A non-sag agent useful in providing non-sag properties to many conventional curable, polymeric adhesives and sealants, said agent comprising:a first component comprising crush resistant coated particles wherein the first component particles are less than about 1 and 1/2 microns in size and have a coating of about 0.1% to about 10% by weight of the particle and wherein said coating substantially comprises a first surface modifying agent,a second component comprising crush resistant coated particles wherein the second component particles are about 1 and 1/2 to about 3 microns in size and have a coating of about 0.

Abstract: A two-stage method for the surface modification of natural or synthetic, oxide or silicate fillers using organosilicon compounds of the formulas:[R.sub.n.sup.1 (RO).sub.3-n Si--(Alk).sub.m --(Ar).sub.p ]2 [S] xor[R.sub.n.sup.1 (RO).sub.3-n Si--(Alk).sub.m --(Ar).sub.p SCNin which filler and compound are intensively mixed without the addition of further solvents and the homogenized mixture is subjected in a preheated mixer to the hydrophobing reaction.

Abstract: A room temperature vulcanizable silicone rubber composition is described. The composition comprises an organopolysiloxane which is blocked with a hydroxyl group or hydrolyzable group at ends of the molecular chain thereof, fumed silica which is surface treated with a monoorganosilane of the general formula, R.sup.1 SiY.sub.3, or a monoorganopolysilazane of the general compositional formula, R.sup.1 Si(NH).sub.3/2, wherein R.sup.1 in each formula represents a monovalent hydrocarbon group and each Y represents a hydrolyzable group and which has a specific area of not less than 50 m.sup.2 /g, and an organosilicon compound of the general formula, R.sup.2.sub.1 SiZ.sub.4-1, wherein R.sup.2 represents an unsubstituted or substituted monovalent hydrocarbon group, Z represents a hydrolyzable group, and 1 is a value of 0 or 1, or its partially hydrolyzed product. The composition may further comprise a promoter for the vulcanization.

Abstract: The tear strength of cured organosiloxane elastomers can be increased and the compression set value reduced without adversely affecting other physical properties if the composition used to prepare the elastomer is curable by a platinum-catalyzed hydrosilation reaction and contains a mixture of two liquid diorganoalkenylsiloxy terminated polydiorganosiloxanes, one of which constitutes from 96 to 99.5 percent by weight of said mixture and contains the alkenyl radicals only at the terminal positions. The second polydiorganosiloxane contains both terminal alkenyl radicals and from 1 to 5 mole percent of alkenyl radicals on non-terminal repeating units.

Abstract: A sealing resin composition is provided with is useful in the encapsulation of an electronic component and comprises a melt-processable polyester having a weight-average molecular weight of 1000 to 3900 and is capable of forming an optically anisotropic molten phase, and at most 80 percent by weight based upon the total weight of the composition of an inorganic powder which has been surface-treated with an epoxysilane or mercaptosilane coupling agent.

Abstract: A room temperature-curable composition comprising (A) a silanol-terminated polydiorganosiloxane having a viscosity measured at 25.degree. C. of from 100 to 200,000 cSt, (B) an epoxy-terminated polyether, (C) an organosilicon compound, (D) an inorganic filler, and (E) a curing catalyst. The composition is suitably used as a building sealant which causes no fouling of the areas surrounding joints even after applied to the joints.

Abstract: The present invention provides methods for treating reclaimed sand obtained from dismantled foundry molds and cores which contain residue from a cured binder of an ester-cured alkaline phenolic resin. Treatment of the reclaimed sand with a silane solution containing one or more amines, particularly an aqueous solution containing a silane and one or more amines, enhances the tensile strengths of foundry molds and cores produced therefrom relative to those obtained with untreated reclaimed sand. Methods for producing foundry cores and molds which incorporate such a treatment process are also provided by this invention, as are raw batch formulations.

Abstract: Novel organopolysiloxane compositions that are storage-stable in the absence of moisture, but curable into elastomeric state in the presence of moisture, nonetheless devoid of any organometallic curing catalyst, include (A) an .alpha.,.omega.-dihydroxydiorganopolysiloxane oil, (B) a ketiminoxysilane crosslinking agent, (C) inorganic filler material, (D) an organofunctional silane and (E) a substituted hydroxylamine; the crosslinked elastomers produced from these organopolysiloxane compositions are well adopted for such applications as foodstuff packaging, medical bandaging and antifouling/antisoiling coatings.

Abstract: Silicon-containing polymers consist ofa) from 65 to 99.95 parts by weight of one or more acrylates and/or methacrylates of an aliphatic alcohol of 1 to 12 carbon atoms (monomers A),b) from 0 to 30 parts by weight of one or more ethylenically unsaturated monomers capable of undergoing free radical copolymerization (monomers B),c) from 0.05 to 10 parts by weight of one or more anhydrides of an .alpha.,.beta.-monoethylenically unsaturated dicarboxylic acid of 4 to 10 carbon atoms (monomers C) or from 0.1 to 10 parts by weight of one or more monomers containing one or more isocyanate groups and capable of undergoing free radical copolymerization (monomers D) andd) effective amounts of one or more silanes of the general formula INH.sub.2 --R.sup.1 --Si(R.sup.2).sub.3-m (R.sup.3).sub.m (I)where m is 0, 1 or 2, R.sup.1 is a hydrocarbon chain of not more than 10 carbon atoms which may be interrupted by oxygen or nitrogen, the radicals R.sup.2 are identical or different hydrolyzable groups and the radicals R.sup.

Abstract: The invention relates to mixtures of polyarylene sulfides, glass fibers and silanes containing nitro groups which are distinguished by good mechanical properties (for example relatively high flexural strength or outer fiber strain).

Abstract: This invention discloses curable silicon compositions which impart beneficial characteristics to the fibers that are not possible without the use of the instant invention compositions and process.

Abstract: An organopolysiloxane composition comprising an organopolysiloxane and compounded therein a silica fine powder treated with a silazane compound containing a group represented by the following formula: ##STR1## wherein Rf represents a fluorine-containing organic group; R.sup.2 represents a monovalent hydrocarbon group containing no fluorine atom; R.sup.3 represents a divalent hydrocarbon group; and c is an integer of 0, 1 or 2. The composition has superior release properties and transparency.

Abstract: A room temperature curing composition comprising:(A) a silanol-terminated polydiorganosiloxane;(B) a hydrolyzable silyl-terminated polymer obtained by reacting:(a) an epoxy-terminated polyether;(b)(i) an heterocyclic compound containing imino groups, and/or;(ii) an aromatic compound or a heterocyclic compound containing mercapto groups; and,(c) an organosilicon compound containing an epoxy group and a hydrolyzable group;(C) an inorganic filler; and,(D) a curing catalyst.

Abstract: The invention relates to a process for rendering particulate solids containing Si-OH groups hydrophobic which comprises reacting a water repellent containing an organo-silicon compound with particulate solids containing Si-OH groups with simultaneous mechanical loading of the reaction mixture, in which from 5 to 50 percent by weight of the particulate solids containing Si-OH groups are used, based on the total weight of the reaction mixture containing particulate solids and water repellent, and the use of the resultant hydrophobic particulate solids in compositions containing diorganopolysiloxanes, which can be cured to form elastomers.

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 glass fiber-reinforced thermoplastic resin comprising:(i) 100 parts by weight of a blend of a polyamide and a styrene copolymer which in turn is a blend of a high impact polymer such as ABS and a carboxylated styrene copolymer and, optionally, a styrene copolymer with acrylonitrile or MMA;(ii) 5 to 100 parts by weight of glass fiber reinforcement, which glass fiber has a coat on it of a binder which comprises a polymeric binder composition and a silane binder, both being specified.

Abstract: Glass fiber reinforced linear alternating polymers of carbon monoxide and at least one ethylenically unsaturated hydrocarbon show good mechanical properties when the glass fiber employed for reinforcement contains a sizing with an aminosilane functional group, and a polymeric film former with polyurethane and epoxy functional groups, and is present in an amount of from about 1 to 45 weight percent of the reinforced fiber.

Abstract: In a heat curable silicone rubber composition comprising a polydiorganosiloxane base polymer and a curing catalyst, the improvement comprising an effective amount of co-curing agent. Preferably, the co-curing agent has the general formula ##STR1## where R is H or a C.sub.1-5 alkyl radical, R.sup.1 is a C.sub.1-5 alkylene radical, each R.sup.2 is independently selected from H and CH.sub.3, R.sup.3 is H or CH.sub.3, n equals 0 or 1, and m is an integer from 3 to 6, inclusive.

Abstract: The invention relates to N,N'- and N,N',N'-substituted silyl ureas of the general formula ##STR1## and to their use as antidegradation agents which can not be washed out in polymers, especially rubber.

Abstract: Composite materials based on cement or gypsum materials reinforced by mixing with cellulosic fibers grafted with silylating agents. Processes for preparing these reinforced composites are also disclosed.

Abstract: There is disclosed a polyarylene sulfide resin composition which comprises 100 parts by weight of a polyarylene sulfide resin and 5 to 300 parts by weight of metal hydroxides composed of 50% by weight or more of magnesium hydroxide, and may further containing 20 to 120 parts by weight of glass fibers and 30 to 80 parts by weight of talc.

Abstract: Continuous glass fiber reinforced composites are made by pultruding the fibers with mixtures of certain silanes and thermoplastic resin in which the silanes have adsorbed onto the thermoplastic resin.

Abstract: Compounds useful for improving the intra-film binding of micaceous particulates in films formed from coating compositions which contain such micaceous particulates comprise urethanes or ureas which are the reaction products of silylalkyl- or silylaryl isocyanates with blocked or unblocked alcohols, aminoalcohols, or polydiol alcohols. The compounds may also be the reaction products of silylalkyl- or silylarylamines with half-blocked diisocyanates which are themselves the reaction products of a diisocyanate with a blocked or unblocked alcohol, aminoalcohol, or polydiol alcohol.Micaceous particulates which have been surface modified by reaction with these compounds, as well as coating compositions comprising such surface-modified micaceous particulates, and coated substrates are also disclosed.

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.

Abstract: A novel method is proposed for the preparation of a curable organopolysiloxane composition which is suitable as a material of a mold-making having excellent mechanical properties and durability in use for replica molding. The method comprises (a) blending a vinyl-containing organopolysiloxane with a hydrophobic reinforcing silica filler and hexamethyl disilazane, optionally, together with water each in a limited amount, (b) subjecting the blend to a heat treatment and (c) admixing the heat-treated blend with an organohydrogenpolysiloxane as a crosslinking agent of the vinyl-containing organopolysiloxane and a platinum compound as a catalyst for promoting the addition reaction between the silicon-bonded vinyl groups and the silicon-bonded hydrogen atoms.

Abstract: There is provided a self-leveling silicone composition comprising(a) an acyloxy-terminated polydiorganosiloxane,(b) an effective amount of condensation catalyst, and(c) an amount of amine effective for rendering said composition self-leveling.

Abstract: An orthodontic appliance adhesive has a plurality of glass spheres maintained therein. The glass spheres are coated with a release agent which repels the resin of the adhesive, causing the glass spheres to define effective voids within the adhesive when it is cured. These voids facilitate fracture of the adhesive composite. The beads further provide for a uniform spacing between an orthodontal bracket and a tooth when the adhesive is used for such bonding.

Abstract: A high temperature PVC resin blend is made by blending from 60 to 85 parts PVC with no more than 40 parts of a ("alpha-SAN") copolymer of alpha-methyl styrene ("AMS"), styrene ("S") and acrylonitrile ("AN"), and less than 20 parts by wt additives including stabilizers, antioxidants, lubricants, and processing aids. In addition, an impact modifier may be added. The blend with particularly sized glass fibers, may be thermoformed at an elevated processing temperature and pressure, to provide a reinforced composite in which the PVC is covalently bonded to the glass fiber. The composite has a substantially higher HDT and equivalent tensile strength, compared to that of a similarly reinforced, unblended PVC composite, without sacrificing the novel composite's other desirable physical properties.

Abstract: A novel organosilane coupling agent is disclosed and its use as an adhesion promoter in mineral-filled unsaturated polymer systems is described. Additionally, use of the organosilane as a primer for various substrates is presented. The coupling agent comprises the reaction product of an isocyanatoalkyl ester of acrylic or methacrylic acid with an aminoorganosilane. The organosilane so formed links the acryloxyalkyl or methacryloxyalkyl functionality to an alkylene, or aminoalkylene, group on the silicon atom through a urea group. Use of the organosilane as a coupling agent in a mineral-filled unsaturated polymer results in superior resistance to moisture, particularly when the polymer is selected from the group of corrosion resistant unsaturated polyesters.

Abstract: Novel ionomeric silane coupling agents are disclosed and their use in bonding a matrix polymer to a mineral substrate is described. The coupling agents comprise amic acid-functional silanes which are partially neutralized with metal cations and are prepared by reacting a mixture of (I) an amine-functional silane, (II) a stoichiometric excess of a dicarboxylic organic acid and (III) an ionic compound containing a metal cation, wherein 10% to 80% of the excess carboxylic acid functionality is neutralized by the metal cations. The coupling agents greatly improve bonding to the matrix polymer in moist environments and are particularly suitable for use in formulating filled injection molding compositions.

Abstract: A novel ionomeric silane coupling agent is disclosed and its use in bonding a matrix polymer to a mineral substrate is described. The coupling agent is prepared by partially neutralizing the combined acid functionality present in a mixture of an acid-functional silane (or metal salt thereof) and an acid-functional film former with a metal ion. The coupling agent greatly improves bond strength in moist environments and is particularly suitable for use in formulating filled injection molding compositions.

Abstract: Electronic components can be encapsulated with a poly(arylene sulfide) composition containing a mercaptosilane such as, for example, 3-mercaptopropyltrimethoxysilane.

Abstract: A solder powder is coated with an agent that protects the powder from oxidation. The coating agent is substantially insoluble in a vehicle used to make solder pastes. Thus, pastes made with the coated powders also resist oxidation even when exposed to air. A method for making the coated solder powders is also disclosed and claimed.

Abstract: Polyester resins modified with a glass fiber reinforcing agent treated with novel sizing agents exhibit marked by improved physical strength properties.

Abstract: An improved method of producing treated silica filler for use with silicone rubber operates at ambient temperature in a short period of time. The method consists essentially of mixing reinforcing silica with a volatile treating agent of the formula R.sub.x Si(OR').sub.4 -.sub.x, wherein R is a substituted or unsubstituted, saturated or unsaturated, alkyl or aryl radical having from 1 to 6 carbon atoms, R' is an alkyl radical having from 1 to 3 carbon atoms, x is 1 or 2, and R and R' are chosed so that the vapor pressure of the alkoxysilane exceeds 10 Pa (0.0001) atmosphere) at treatment temperature, in combination with a volatile catalyst selected from the group consisting of acid A, base B, and mixtures thereof; wherein acid A is a volatile acid or acid progenitor, and base B is a silylamine or silazane, acid A and base B being chosen so that the vapor pressure of either acid A or base B exceeds 500 Pa (0.

Abstract: A primar composition comprising(A) 100 parts by weight of an organo-polysiloxane represented by the formula (1) ##EQU1## wherein R.sup.1 represents a substituted or unsubstituted monovalent hydrocarbon group, and a is a number of from 1.98 to 2.01, provided that 25 to 50 mol % of the hydrocarbon group is a perfluoroalkyl group and 0.01 to 10 mol % of the hydrocarbon group is a vinyl group, said organo-polysiloxane having a viscosity as measured at 25.degree. C. of 1,000,000 centistokes or more;(B) 5 to 100 parts by weight of a silica type filler;(C) 0.5 to 50 parts by weight of isocyanurate-type organosilicon compound represented by the formula (2) ##STR1## wherein R.sup.2 represents an alkyl group, a fluoroalkyl group or an alkoxyalkyl group, each having 1 to 5 carbon atoms in the alkyl moiety, and n is an integer of 1 to 5; and(D) a desired amount of an organic solvent.

Abstract: Epoxide resins which are reinforced with aramid fibers and in which the adhesion between fibers and resin is improved by means of a pretreatment of the fibers with organosilanes.

Abstract: A primer composition which is particularly effective to strongly bond fluorosilicone rubbers to metal, plastics, fibers, and the like, comprising(A) 100 parts by weight of a polyorganosiloxane represented by formula (I): ##EQU1## wherein R.sup.1 represents a substituted or unsubstituted monovalent hydrocarbon group, 10 to 50 mol % of the hydrocarbon groups of R.sup.1 being perfluoroalkyl and 0.01 to 1.0 mol % of the hydrocarbon groups of R.sup.1 being vinyl, and a is a number of from 1.98 to 2.01, and which has a viscosity as measured at 25.degree. C. of 1,000,000 cSt or more;(B) 5 to 100 parts by weight of a silica filler;(C) 0.5 to 50 parts by weight of a compound represented by formula (II): ##STR1## wherein X represents an organosilicon-containing group or a hydrocarbon-containing group, R represents methyl or hydrogen, and n is an integer of 1 or larger; and(D) an organic solvent.