Gelest Inc.

Morrisville, PA, United States

Gelest Inc.

Morrisville, PA, United States

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A heterofunctional poly(alkyleneoxide) according to the invention contains a first polymer terminus containing a protected, unprotected, or derivatized amine or aminoalkyl functionality and a second polymer terminus containing an unsaturated functionality. Reaction products, derivatives, and methods of making these materials are also described.


A novel synthetic route to new classes of polymeric coupling agents using substituted epoxy monomers is reported. In the presence of an initiating agent and tris(pentafluorophenyl)borane catalyst, substituted epoxy monomers bearing polyalkylene oxide and trialkoxysilane moieties undergo a ring-opening polymerization. The polymerization is highly versatile and allows for the fine-tuning of functional, structural, and architectural features of the resulting polymeric coupling agents. These new polyalkylene oxides substituted with organosilyl groups are capable of bonding to and modifying inorganic surfaces. The products of this invention form thin hydrophilic films.


Materials containing the reaction products of a cyclic azasilane with water and a compound or polymer containing an isocyanate or epoxy functional group and methods for their synthesis are provided. Stable mixtures containing a cyclic azasilane and a compound or polymer containing an isocyanate or epoxy functional group according to invention are stored under anhydrous conditions. The invention also provides a novel class of materials, mono and bis(cycloaza)disiloxanes comprising one or two cyclic structures bridged by an SiOSi bond.


Novel N-alkyl substituted perhydridocyclic silazanes, oligomeric N-alkyl perhydridosilazane compounds, and N-alkylaminodihydridohalosilanes, and a method for their synthesis are provided. The novel compounds may be used to form high silicon nitride content films by thermal or plasma induced decomposition.


Hydrophilic N-acylamino acid, N-acyl dipeptide, and N-acyl tripeptide substituted silanes are prepared which can be utilized as reactive surface treatments for particles of pigments, minerals, and fillers. These treated particles form stable dispersions in the aqueous phase of oil-in-water mixtures that are suitable for cosmetic applications. The treated particles may also be used in pressed powder and color cosmetic formulations.


Patent
Gelest Inc. | Date: 2016-04-20

Nanocomposites exhibiting elongation exceeding about 2000%, elastic recovery, and tensile strength exceeding 2.5 MPa are described. A method these elastomers involves performing a catalyzed step growth polymerization of a heterobifunctional siloxane macromonomer compounded with at least about 15 wt % surface passivated silica nanoparticles. The macromonomer has a degree of polymerization of at least about 40 and the silica nanoparticles have nominal diameters of less than about 50 nm.


A continuous or semi-continuous process for producing a high purity germane includes (a) preparing a reaction mixture containing hydrogen and crude germane and (b) separating the hydrogen from the crude germane by a pressure swing adsorption process. The pressure swing adsorption process results in a hydrogen-rich product stream and a germane-rich product stream. The method further includes (c) purifying the germane-rich product stream by continuous distillation thereof to remove impurities therefrom and to produce a high purity germane containing less than 0.1 volume percent of impurities.


Hydridosilapyrroles and hydridosilaazapyrrole are a new class of heterocyclic compounds having a silicon bound to carbon and nitrogen atoms within the ring system and one or two hydrogen atoms on the silicon atom. The compounds have formula (I): in which R is a substituted or unsubstituted organic group and R is an alkyl group. These compounds react with a variety of organic and inorganic hydroxyl groups by a ring-opening reaction and may be used to produce silicon nitride or silicon carbonitride films.


A convenient, practical method for forming elastomers from dual functional siloxanes that cure by a step-growth mechanism is provided. The method involves preparing a first mixture containing a first telechelic siloxane and a hydrosilylation catalyst; preparing a second mixture containing a second telechelic siloxane and a dual functional siloxane having two different polymer termini; and reacting the first mixture with the second mixture to produce the siloxane elastomer. The first and second mixtures may be stored separately until time of use.


Patent
Gelest Inc. | Date: 2014-03-07

Pendant dipodal silanes having formula (I) and methods for their synthesis are provided. In formula (I), R is an organic radical other than methyl and X may be a halogen, an alkoxy group, an acetoxy group, or a dialkylamino group. Films, adhesives, and composites formed from the inventive dipodal silanes generally demonstrate significantly greater hydrolytic resistance and film-forming ability than conventional silanes. RSiX_(2)CH_(2)SiX_(3)(I)

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